CN102869091A - Method and device for determining arrival time of location reference signals - Google Patents
Method and device for determining arrival time of location reference signals Download PDFInfo
- Publication number
- CN102869091A CN102869091A CN2012103415036A CN201210341503A CN102869091A CN 102869091 A CN102869091 A CN 102869091A CN 2012103415036 A CN2012103415036 A CN 2012103415036A CN 201210341503 A CN201210341503 A CN 201210341503A CN 102869091 A CN102869091 A CN 102869091A
- Authority
- CN
- China
- Prior art keywords
- reference signals
- location reference
- signal
- receives
- produces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000000605 extraction Methods 0.000 claims abstract description 42
- 239000000284 extract Substances 0.000 claims description 45
- 125000004122 cyclic group Chemical group 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000002596 correlated effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 18
- 230000001186 cumulative effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Images
Abstract
The invention discloses a method and a device for determining the arrival time of location reference signals, relating to the technical field of communication. According to an embodiment of the invention, partial signals are respectively extracted from locally generated location reference signals and received location reference signals according to a specific extraction manner, and first association is carried on the partial signals extracted from the locally generated location reference signals and the partial signals extracted from the received location reference signals in a first search window; a second search window is determined according to the result of the first association, and if the signal to noise ratio of the first association is more than a first threshold value, second association is carried on the locally generated location reference signals and the received location reference signals in the second search window; and if the signal to noise ratio of the second association is more than a second threshold value, the arrival time of the received location reference signals is determined to be the result of the second association. According to the embodiment of the invention, the operation complexity and the operation time are reduced.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of definite location reference signals method and the device of the time of advent.
Background technology
Wireless location technology is to utilize cordless communication network, measure by some parameters to the radio wave that receives, according to specific algorithm a certain terminal residing position in is sometime measured, in order to relevant location information service is provided or carries out real-time monitoring and tracking for the terminal use.Wireless location technology comprises location technology based on cordless communication network, based on location technology and the hybrid location determination technology of terminal.
Location technology based on cordless communication network mainly contains TOA(Time Of Arrival, the time of advent), CELLID(Cell ID, based on cell ID) and OTDOA(Observation Time Difference Of Arrival, observation arrives the time difference) etc.The OTDOA technology that to be a plurality of base stations reference signal of measuring according to terminal position to the time difference (Reference Signal Time Difference, RSTD) of terminal wherein, concrete method comprises:
At first, terminal receives the location reference signals that each residential quarter that participates in the location sends, and the local location reference signals that produces each cell of origin, then, the time of advent of the location reference signals that each cell of origin that the location reference signals that terminal sends according to each residential quarter and the location reference signals of local each cell of origin that produces are determined to receive sends, network side further obtains the poor RSTD time of advent of the location reference signals of each cell of origin and position reference residential quarter transmission, so that can be realized by a plurality of RSTD that collection terminal is measured the location to terminal.
At present to be that location reference signals that the location reference signals that receives by each residential quarter and described residential quarter produce carries out in the search window relevant for the method for the time of advent of the location reference signals that sends of terminal each cell of origin of determining to receive, and the time of advent of the location reference signals of each cell of origin transmission that location positioning of peak value receives after relevant according to this.At LTE(Long Term Evolution, Long Term Evolution) in the system in order to improve the precision of terminal positioning, allow the location reference signals of residential quarter at 20M, 15M, 10M, 5M, 3M and 1.4M send on 6 kinds of bandwidth totally, allowing the maximum magnitude of search window is 6144Ts, Ts=1/30.72M wherein, but because the complexity of related operation is determined by multiplication, and the number of times of processing multiplication in the terminal unit time is limited, the multiplication quantity of namely processing within the time that system requirements reports is limited, so the bandwidth of the location reference signals that sends when the residential quarter is large and search window when larger, terminal determines that the method operand of location reference signals time of advent will be very large, exceeds sometimes the disposal ability of terminal.
Summary of the invention
Embodiments of the invention provide a kind of definite location reference signals method and the device of the time of advent, have solved present terminal and have determined that the method operand of location reference signals time of advent is large, exceed the problem of terminal processing capacity.
The embodiment of the invention provides a kind of definite location reference signals method of the time of advent, comprising:
Extracting part sub-signal the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives, and will the described part signal that from the location reference signals that this locality produces, extracts and the described part signal that from the location reference signals that receives, extracts first search for carry out in the window first relevant;
Determine the second search window according to the described first relevant result;
If the first relevant signal to noise ratio of determining according to the described first relevant result is greater than the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives are carried out second relevant in described the second search window;
If the second relevant signal to noise ratio of determining according to the described second relevant result is greater than the second threshold value, be the described second relevant result the time of advent of then determining the described location reference signals that receives.
The embodiment of the invention also provides a kind of definite location reference signals device of the time of advent, comprising:
Abstraction module, extracting part sub-signal the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives;
It is first relevant that the first correlation module, the part signal that the location reference signals that is used for producing from this locality described in the described abstraction module extracts and the described part signal that extracts from the location reference signals that receives carry out in the first search window;
Search window update module is used for determining the second search window according to the first relevant result described in described the first correlation module;
The second correlation module, if the first relevant signal to noise ratio that is used for determining according to the first relevant result is greater than the first threshold value, carry out second relevant in the second search window of then the described local location reference signals that produces and the described location reference signals that receives being determined in described search window update module;
The time of advent determination module, if the second relevant signal to noise ratio that is used for determining according to the second relevant result greater than the second threshold value, be the described second relevant result the time of advent of then determining the described location reference signals that receives.
Can be found out by the technical scheme that the embodiment of the invention described above provides, the time of advent of the location reference signals of determining by the embodiment of the invention, reduce computational complexity and operation time.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The flow chart of the method for Fig. 1 provides for the embodiment of the invention a kind of definite location reference signals time of advent;
The structural representation of the device of Fig. 2 provides for the embodiment of the invention a kind of definite location reference signals time of advent.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides a kind of definite location reference signals method of the time of advent, as shown in Figure 1, comprising:
11, extracting part sub-signal the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives.
Particularly, terminal receives the OTDOA auxiliary data message that network side issues, and according to this OTDOA auxiliary data message sink location reference signals, and produces location reference signals according to the information of carrying in this OTDOA auxiliary data message in this locality.
Further, the purpose of extracting part sub-signal is the complexity of carrying out related operation in order to reduce terminal from this locality location reference signals that produces and the location reference signals that receives, so extracting can be the extraction of signal in the time domain, it also can be the extraction of signal in the frequency domain, also can be the extraction of signal in the spatial domain, can also be that time-domain and frequency-domain combination, time domain are combined with spatial domain, frequency domain is combined with spatial domain and the extraction of signal is carried out in the combination of time domain, frequency domain and spatial domain.
As optionally, described specific extraction mode can comprise any of following mode:
One, reduces the described local location reference signals that produces and the sample frequency extracting part sub-signal of the described location reference signals that receives.
Two, extract the described local location reference signals that produces and the signal in the described location reference signals nominated bandwidth that receives.
Three, extract the interior signal of the interior special symbol of a subframe of the described local location reference signals that produces and the described location reference signals that receives.
If the sub-frame number of the four described local location reference signals that produce and the described location reference signals that receives, then extracts the wherein interior signal of given sub-frame in equaling particular value.
If the number of transmission antennas of the five described local location reference signals that produce and the described location reference signals that receives and the product of reception antenna quantity then extract the signal of specifying on transmitting antenna and/or the reception antenna more than or equal to designated value.
But because the extracting part sub-signal may cause that detection probability reduces from this locality location reference signals that produces and the location reference signals that receives, so the reduction of preferred detection probability is less, the abstracting method that reduced complexity is larger.(physical significance of detection probability is to have this signal, detects the probability of this signal.If) for example bandwidth be 20M, subframe is 1,8 OFDM(OFDMs are arranged, Orthogonal Frequency Division Multiplexing in this subframe) symbol, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%, then bandwidth is 10M, and subframe is 1, and 8 OFDM symbols are arranged in this subframe, 1 transmitting antenna, the detection probability of 2 reception antennas are 95%.Although both detection probabilities differ very little, complexity differs 4 times.And if for example bandwidth is 10M, 2 subframes have 8 OFDM symbols, 1 transmitting antenna in the subframe, the detection probability of 2 reception antennas is 99%, and bandwidth is 10M so, 6 subframes, 8 OFDM symbols are arranged in the subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%.Although it is very little that detection probability differs, complexity differs 3 times.
Specifically to reduce complexity that terminal carries out related operation as original 1/4 as example, the extraction to signal is specifically described to above-mentioned specific extraction mode:
1) in frequency domain, be the extraction that 2 desampling fir filter is finished location reference signals by reduce sampling frequency.
For example the down-sampled filtering of the location reference signals of 20M or 15M is arrived the signal in the 10M bandwidth, the down-sampled filtering of the location reference signals that is about to receive is to 10M, and the location reference signals in the generation 10M bandwidth.
2) in time domain, set the sampled signal that reduce sampling frequency is 2 extraction location reference signals.
The location reference signals that is about to receive and the local location reference signals that produces extract every a bit.
3) in time domain, extract any two OFDM symbols in the position reference signal subframe.
For example the signal of general cyclic prefix (Normal cyclic prefix) subframe internal symbol #3 and symbol #6 meets #3 and #6 but be not limited to.
4) if the sub-frame number of location reference signals is 4, then in time domain, extract the signal in one of them position reference signal subframe.
5) if the product of reception antenna and transmitting antenna is 4, then in spatial domain, extract location reference signals and the local location reference signals that produces on the transmitting antenna that a reception antenna receives.
6) if the number of transmitting antenna is 4, then in spatial domain, extract the local location reference signals that produces on the transmitting antenna.
7) if the number of reception antenna is 4, then in spatial domain, extract the location reference signals that reception antenna receives.
12, the described part signal that extracts from the location reference signals that this locality produces and the described part signal that extracts from the location reference signals that receives are carried out in the first search window first relevant.
Particularly, common the first search center of window and size are that indication in the OTDOA auxiliary data message that issues by network side is definite.
The described part signal that extracts from the location reference signals that this locality produces carries out the first relevant required multiplication number with the described part signal that extracts and is determined by the extraction mode in the first search window from the location reference signals that receives.For example: set a reception antenna, a transmitting antenna, sample rate is 30.72M, a position reference signal subframe, location reference signals is 8 OFDM symbols in this position reference signal subframe, during search window 512*Ts, the location reference signals that receives carries out relevant needed multiplication number with the local location reference signals that produces in the search window be Kue.So when NRx reception antenna, NTx transmitting antenna, reduce sampling frequency Dn, location reference signals comprises Nsubframe subframe, location reference signals is Nsymb OFDM symbol in each subframe, when the search window was W*Ts, the multiplication number of related operation was Kue*NRx*NTx*Nsubframe* (Nsymb/8) * (W/512) * (1/Dn) 2, and wherein Kue, Nsubframe, Nsymb, NRx, NTx and Dn are positive integer.
13, determine the second search window according to the described first relevant result.
Particularly, estimated value according to the strongest path position in described the first residential quarter of peaked location positioning among the described first relevant result, determine described the second search window centre position according to the described estimated value of strong path position, described the second search window size is determined by the Cyclic Prefix of the described local location reference signals that produces and/or the described location reference signals that receives, the length of general search window is 2 times of Cyclic Prefix, thereby determines the second search window.
If 14 the first relevant signal to noise ratios of determining according to the described first relevant result are more than or equal to the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives are carried out second relevant in described the second search window.
This first threshold value can determine that according to emulation the false alarm probability that supposing the system requires is 10e-6, can obtain to satisfy under this extraction condition the lowest signal-to-noise value of false alarm probability by emulation, and this snr value is made as the first thresholding.Extraction condition refers to OFDM symbolic number in the actual subframe, number of sub frames, bandwidth, antenna number.Wherein the physical significance of false alarm probability is to detect the probability that has this signal when this signal not.When the first relevant signal to noise ratio less than the first threshold value, be illustrated in and do not detect signal in the signal that receives.Therefore represent that the location finding of the most powerful path of current correlation is failed.
Particularly, the first relevant signal to noise ratio be signal specific energy and with the energy of other signals and ratio.The division of signal specific and other signals has several different methods.Wherein a kind of method can according to correlation obtain the peaked of predetermined number and, this predetermined number peaked and as the energy of signal specific, other correlations are as the energy of other signals in the cumulative search window.Wherein the physical significance of predetermined number is the multipath number of channel.Another kind method can multiply by according to the maximum of correlation predetermined attenuation coefficient as thresholding, cumulative all greater than the correlation of this thresholding energy as signal specific, other correlations are as the energy of other signals in the cumulative search window.Predetermined number wherein, predetermined attenuation coefficient can be determined according to emulation, also are to determine according to the false alarm probability of system requirements.
If 15 the second relevant signal to noise ratios of determining according to the described second relevant result are greater than the second threshold value, be the described second relevant result the time of advent of then determining the described location reference signals that receives.
Particularly, some extraction mode reduces the resolution that RSTD measures, as falls the extraction mode of bandwidth.Some extraction mode can change the noise profile in the measurement, as down-sampled, reduces cumulative symbol, subframe and antenna number.Therefore adopt second to be correlated with on original signal dimension, obtain the obtainable certainty of measurement of primary signal in the little search window.
This second thresholding can determine according to emulation that equally also the false alarm probability that supposing the system requires is 10e-6, can obtain to satisfy under this condition the lowest signal-to-noise value of false alarm probability by emulation, and this signal to noise ratio is made as the second thresholding.The physical significance of false alarm probability is to detect the probability that has this signal when this signal not.When the second relevant signal to noise ratio less than the second threshold value, be illustrated in and do not detect signal in the signal that receives.Therefore represent that the location finding of the most powerful path of current correlation is failed.
As optionally, if in the step 14 according to the described first relevant signal to noise ratio less than or equal to described the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives are carried out third phase in described the first search window and close.Subsequent step corresponding to this step then is so: if the signal to noise ratio that the third phase that the result of closing according to third phase determines closes greater than described the second threshold value, be the result that described third phase closes the time of advent of then determining the described location reference signals that receives.The purpose of specifically carrying out the third phase pass is to process owing to after extracting the verification and measurement ratio that reduces undetected situation.
Before execution in step 11, can also comprise:
The bandwidth of judging the described local location reference signals that produces and/or the described location reference signals that receives whether more than or equal to the first predetermined value and, and judge that whether described first search for the length of window more than or equal to the second predetermined value, if further the bandwidth of the described local location reference signals that produces and/or the described location reference signals that receives more than or equal to the length of the first predetermined value and described the first search window more than or equal to the second predetermined value, extracting part sub-signal the location reference signals that then produces from this locality respectively according to specific extraction mode and the location reference signals that receives.
Particularly, the computational complexity that this first predetermined value and the second predetermined value can be accepted according to terminal is determined, supposes that specifically the complexity that terminal can be accepted is Kc, and complexity relevant under the first predetermined value and the second predetermined value respective conditions is necessarily greater than Kc.May also can reserve certain surplus on the engineering, for generation of local location reference signals, the complexity of the maximum value search of correlation and/or the computings such as calculating of RSTD.Namely relevant complexity is necessarily greater than coef*Kc under the first predetermined value and the second predetermined value respective conditions, and wherein coef is the real number between 0～1.
Further, the time of advent of the location reference signals that each cell of origin that terminal is determined according to the method for above-mentioned definite location reference signals time of advent sends, obtain the location reference signals poor RSTD time of advent that this cell of origin and adjacent positioned residential quarter send, so that a plurality of RSTD that network side is measured by collection terminal realize the location to terminal.
The embodiment of the invention also provides a kind of definite location reference signals device of the time of advent, and this device can be installed in the terminal and also can use separately, as shown in Figure 2, comprising:
Particularly, terminal receives the OTDOA auxiliary data message that network side issues, and according to this OTDOA auxiliary data message sink location reference signals, and produces location reference signals according to the information of carrying in this OTDOA auxiliary data message in this locality.
Further, the purpose of extracting part sub-signal is the complexity of carrying out related operation in order to reduce terminal from this locality location reference signals that produces and the location reference signals that receives, so extracting can be the extraction of signal in the time domain, it also can be the extraction of signal in the frequency domain, also can be the extraction of signal in the spatial domain, can also be that time-domain and frequency-domain combination, time domain are combined with spatial domain, frequency domain is combined with spatial domain and the extraction of signal is carried out in the combination of time domain, frequency domain and spatial domain.
As optionally, described specific extraction mode can comprise any of following mode:
One, reduces the described local location reference signals that produces and the sample frequency extracting part sub-signal of the described location reference signals that receives.
Two, extract the described local location reference signals that produces and the signal in the described location reference signals nominated bandwidth that receives.
Three, extract the interior signal of the interior special symbol of a subframe of the described local location reference signals that produces and the described location reference signals that receives.
If the sub-frame number of the four described local location reference signals that produce and the described location reference signals that receives, then extracts the wherein interior signal of given sub-frame in equaling particular value.
If the number of transmission antennas of the five described local location reference signals that produce and the described location reference signals that receives and the product of reception antenna quantity then extract the signal of specifying on transmitting antenna and/or the reception antenna more than or equal to designated value.
But because the extracting part sub-signal may cause that detection probability reduces from this locality location reference signals that produces and the location reference signals that receives, so the reduction of preferred detection probability is less, the abstracting method that reduced complexity is larger.(physical significance of detection probability is to have this signal, detects the probability of this signal.If) for example bandwidth be 20M, subframe is 1,8 OFDM(OFDMs are arranged, Orthogonal Frequency Division Multiplexing in this subframe) symbol, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%, then bandwidth is 10M, and subframe is 1, and 8 OFDM symbols are arranged in this subframe, 1 transmitting antenna, the detection probability of 2 reception antennas are 95%.Although both detection probabilities differ very little, complexity differs 4 times.And if for example bandwidth is 10M, 2 subframes have 8 OFDM symbols, 1 transmitting antenna in the subframe, the detection probability of 2 reception antennas is 99%, and bandwidth is 10M so, 6 subframes, 8 OFDM symbols are arranged in the subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%.Although it is very little that detection probability differs, complexity differs 3 times.
Specifically to reduce complexity that terminal carries out related operation as original 1/4 as example, the extraction to signal is specifically described to above-mentioned specific extraction mode:
1) in frequency domain, be the extraction that 2 desampling fir filter is finished location reference signals by reduce sampling frequency.
For example the down-sampled filtering of the location reference signals of 20M or 15M is arrived the signal in the 10M bandwidth, the down-sampled filtering of the location reference signals that is about to receive is to 10M, and the location reference signals in the generation 10M bandwidth.
2) in time domain, set the sampled signal that reduce sampling frequency is 2 extraction location reference signals.
The location reference signals that is about to receive and the local location reference signals that produces extract every a bit.
3) in time domain, extract any two OFDM symbols in the position reference signal subframe.
For example the signal of general cyclic prefix (Normal cyclic prefix) subframe internal symbol #3 and symbol #6 meets #3 and #6 but be not limited to.
4) if the sub-frame number of location reference signals is 4, then in time domain, extract the signal in one of them position reference signal subframe.
5) if the product of reception antenna and transmitting antenna is 4, then in spatial domain, extract location reference signals and the local location reference signals that produces on the transmitting antenna that a reception antenna receives.
6) if the number of transmitting antenna is 4, then in spatial domain, extract the local location reference signals that produces on the transmitting antenna.
7) if the number of reception antenna is 4, then in spatial domain, extract the location reference signals that reception antenna receives.
It is first relevant that the first correlation module 22, the part signal that the location reference signals that is used for producing from this locality described in the described abstraction module 21 extracts and the described part signal that extracts from the location reference signals that receives carry out in the first search window.
Particularly, common the first search center of window and size are that indication in the OTDOA auxiliary data message that issues by network side is definite.
The described part signal that extracts from the location reference signals that this locality produces carries out the first relevant required multiplication number with the described part signal that extracts and is determined by the extraction mode in the first search window from the location reference signals that receives.For example: set a reception antenna, a transmitting antenna, sample rate is 30.72M, a position reference signal subframe, location reference signals is 8 OFDM symbols in this position reference signal subframe, during search window 512*Ts, the location reference signals that receives carries out relevant needed multiplication number with the local location reference signals that produces in the search window be Kue.So when NRx reception antenna, NTx transmitting antenna, reduce sampling frequency Dn, location reference signals comprises Nsubframe subframe, location reference signals is Nsymb OFDM symbol in each subframe, when the search window was W*Ts, the multiplication number of related operation was Kue*NRx*NTx*Nsubframe* (Nsymb/8) * (W/512) * (1/Dn) 2, and wherein Kue, Nsubframe, Nsymb, NRx, NTx and Dn are positive integer.
Search window update module 23 is used for determining the second search window according to the first relevant result described in described the first correlation module 22.
Particularly, estimated value according to the strongest path position in described the first residential quarter of peaked location positioning among the described first relevant result, determine described the second search window centre position according to the described estimated value of strong path position, described the second search window size is determined by the Cyclic Prefix of the described local location reference signals that produces and/or the described location reference signals that receives, the length of general search window is 2 times of Cyclic Prefix, thereby determines the second search window.
The second correlation module 24, if the first relevant signal to noise ratio that is used for determining according to the first relevant result is greater than the first threshold value, carry out second relevant in the second search window of then the described local location reference signals that produces and the described location reference signals that receives being determined in described search window update module.
This first threshold value can determine that according to emulation the false alarm probability that supposing the system requires is 10e-6, can obtain to satisfy under this extraction condition the lowest signal-to-noise value of false alarm probability by emulation, and this snr value is made as the first thresholding.Extraction condition refers to OFDM symbolic number in the actual subframe, number of sub frames, bandwidth, antenna number.Wherein the physical significance of false alarm probability is to detect the probability that has this signal when this signal not.When the first relevant signal to noise ratio less than the first threshold value, be illustrated in and do not detect signal in the signal that receives.Therefore represent that the location finding of the most powerful path of current correlation is failed.
Particularly, the first relevant signal to noise ratio be signal specific energy and with the energy of other signals and ratio.The division of signal specific and other signals has several different methods.Wherein a kind of method can according to correlation obtain the peaked of predetermined number and, this predetermined number peaked and as the energy of signal specific, other correlations are as the energy of other signals in the cumulative search window.Wherein the physical significance of predetermined number is the multipath number of channel.Another kind method can multiply by according to the maximum of correlation predetermined attenuation coefficient as thresholding, cumulative all greater than the correlation of this thresholding energy as signal specific, other correlations are as the energy of other signals in the cumulative search window.Predetermined number wherein, predetermined attenuation coefficient can be determined according to emulation, also are to determine according to the false alarm probability of system requirements.
The time of advent, determination module 25, if the second signal to noise ratio of being correlated with that is used for determining according to the second relevant result is then determined described deciding of receiving greater than the second threshold value
Particularly, some extraction mode reduces the resolution that RSTD measures, as falls the extraction mode of bandwidth.Some extraction mode can change the noise profile in the measurement, as down-sampled, reduces cumulative symbol, subframe and antenna number.Therefore adopt second to be correlated with on original signal dimension, obtain the obtainable certainty of measurement of primary signal in the little search window.
This second thresholding can determine according to emulation that equally also the false alarm probability that supposing the system requires is 10e-6, can obtain to satisfy under this condition the lowest signal-to-noise value of false alarm probability by emulation, and this signal to noise ratio is made as the second thresholding.The physical significance of false alarm probability is to detect the probability that has this signal when this signal not.When the second relevant signal to noise ratio less than the second threshold value, be illustrated in and do not detect signal in the signal that receives.Therefore represent that the location finding of the most powerful path of current correlation is failed.
As optionally, said apparatus can also comprise that third phase closes module:
Third phase closes module, if be used for according to the described first relevant signal to noise ratio less than or equal to described the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives carried out third phase in described the first search window and closes.The purpose of specifically carrying out the third phase pass is to process owing to after extracting the verification and measurement ratio that reduces undetected situation.
Described time of advent, determination module 25, if the signal to noise ratio that the third phase that also is used for determining according to the result that third phase closes closes greater than described the second threshold value, be the result that described third phase closes the time of advent of then determining the described location reference signals that receives.
As optionally, said apparatus can also comprise judge module:
Judge module, be used for judging that whether the bandwidth of the described local location reference signals that produces and/or the described location reference signals that receives is more than or equal to the first predetermined value, and judge that whether described first search for the length of window more than or equal to the second predetermined value, if the bandwidth of the described local location reference signals that produces and/or the described location reference signals that receives more than or equal to the second predetermined value, is then carried out described abstraction module more than or equal to the length of the first predetermined value and described the first search window.
Particularly, the computational complexity that this first predetermined value and the second predetermined value can be accepted according to terminal is determined, supposes that specifically the complexity that terminal can be accepted is Kc, and complexity relevant under the first predetermined value and the second predetermined value respective conditions is necessarily greater than Kc.May also can reserve certain surplus on the engineering, for generation of local location reference signals, the complexity of the maximum value search of correlation and/or the computings such as calculating of RSTD.Namely relevant complexity is necessarily greater than coef*Kc under the first predetermined value and the second predetermined value respective conditions, and wherein coef is the real number between 0～1.
The specific implementation of the processing capacity of each module that comprises in the said apparatus is described in embodiment of the method before, no longer is repeated in this description at this.
It should be noted that among the above-mentioned node embodiment that included modules is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step that realizes in above-mentioned each embodiment of the method is to come the relevant hardware of instruction to finish by program, corresponding program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The embodiment of the invention is when the bandwidth of the location reference signals of a certain residential quarter is larger (when the computation complexity of being correlated with of this residential quarter is larger), extract respectively the location reference signals of signal that this residential quarter sends and this residential quarter and carry out redefining the search window after first-phase closes, the signal that when the first relevant signal to noise ratio meets particular requirement this residential quarter is sent and the location reference signals of this residential quarter are undertaken second relevant by the described search window that redefines, and when the second relevant signal to noise ratio meets particular requirement, the second relevant result is defined as time of advent of the location reference signals of this residential quarter, computational complexity and operation time have been reduced, make terminal capability obtain maximum application, and make related operation more accurate by the renewal to the search window.
The above; only be the better embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the method for definite location reference signals time of advent is characterized in that, comprising:
Extracting part sub-signal the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives, and will the described part signal that from the location reference signals that this locality produces, extracts and the described part signal that from the location reference signals that receives, extracts first search for carry out in the window first relevant;
Determine the second search window according to the described first relevant result;
If the first relevant signal to noise ratio of determining according to the described first relevant result is greater than the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives are carried out second relevant in described the second search window;
If the second relevant signal to noise ratio of determining according to the described second relevant result is greater than the second threshold value, be the described second relevant result the time of advent of then determining the described location reference signals that receives.
2. method according to claim 1 is characterized in that, described specific extraction mode comprises:
Reduce the described local location reference signals that produces and the sample frequency extracting part sub-signal of the described location reference signals that receives; Or
Extract the described local location reference signals that produces and the signal in the described location reference signals nominated bandwidth that receives; Or
Extract the interior signal of the interior special symbol of a subframe of the described local location reference signals that produces and the described location reference signals that receives; Or
If the sub-frame number of the described local location reference signals that produces and the described location reference signals that receives, then extracts the wherein interior signal of given sub-frame in equaling particular value; Or
If the number of transmission antennas of the described local location reference signals that produces and the described location reference signals that receives and the product of reception antenna quantity more than or equal to designated value, then extract the signal of specifying on transmitting antenna and/or the reception antenna.
3. method according to claim 1 is characterized in that, describedly determines the second search window according to the described first relevant result, comprising:
Estimated value according to the strongest path position in described the first residential quarter of peaked location positioning among the described first relevant result, estimated value according to described the strongest path position is determined described the second search window centre position, and described the second search window size is determined by the Cyclic Prefix of the described local location reference signals that produces and/or the described location reference signals that receives.
4. method according to claim 1 is characterized in that, also comprises:
If less than or equal to described the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives are carried out the third phase pass according to the described first signal to noise ratio of being correlated with in described the first search window;
If the signal to noise ratio that the third phase that the result of closing according to third phase determines closes is greater than described the second threshold value, be the result that described third phase closes the time of advent of then determining the described location reference signals that receives.
5. each described method is characterized in that according to claim 1-4, before the extracting part sub-signal, also comprises the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives:
If the bandwidth of the described local location reference signals that produces and/or the described location reference signals that receives more than or equal to the length of the first predetermined value and described the first search window more than or equal to the second predetermined value, extracting part sub-signal the location reference signals that then produces from this locality respectively according to specific extraction mode and the location reference signals that receives.
6. the device of definite location reference signals time of advent is characterized in that, comprising:
Abstraction module, extracting part sub-signal the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives;
It is first relevant that the first correlation module, the part signal that the location reference signals that is used for producing from this locality described in the described abstraction module extracts and the described part signal that extracts from the location reference signals that receives carry out in the first search window;
Search window update module is used for determining the second search window according to the first relevant result described in described the first correlation module;
The second correlation module, if the first relevant signal to noise ratio that is used for determining according to the first relevant result is greater than the first threshold value, carry out second relevant in the second search window of then the described local location reference signals that produces and the described location reference signals that receives being determined in described search window update module;
The time of advent determination module, if the second relevant signal to noise ratio that is used for determining according to the second relevant result greater than the second threshold value, be the described second relevant result the time of advent of then determining the described location reference signals that receives.
7. device according to claim 6 is characterized in that, specific extraction mode comprises described in the described abstraction module:
Reduce the described local location reference signals that produces and the sample frequency extracting part sub-signal of the described location reference signals that receives; Or
Extract the described local location reference signals that produces and the signal in the described location reference signals nominated bandwidth that receives; Or
Extract the interior signal of the interior special symbol of a subframe of the described local location reference signals that produces and the described location reference signals that receives; Or
If the sub-frame number of the described local location reference signals that produces and the described location reference signals that receives, then extracts the wherein interior signal of given sub-frame in equaling particular value; Or
If the number of transmission antennas of the described local location reference signals that produces and the described location reference signals that receives and the product of reception antenna quantity more than or equal to designated value, then extract the signal of specifying on transmitting antenna and/or the reception antenna.
8. device according to claim 6, it is characterized in that, described search window update module, be used for the estimated value according to the strongest path position in the described first relevant described the first residential quarter of the peaked location positioning of result, estimated value according to described the strongest path position is determined described the second search window centre position, and described the second search window size is determined by the Cyclic Prefix of the described local location reference signals that produces and/or the described location reference signals that receives.
9. device according to claim 6 is characterized in that, also comprises:
Third phase closes module, if be used for according to the described first relevant signal to noise ratio less than or equal to described the first threshold value, then the described local location reference signals that produces and the described location reference signals that receives carried out third phase in described the first search window and closes;
Described time of advent determination module, if the signal to noise ratio that the third phase that also is used for determining according to the result that third phase closes closes greater than described the second threshold value, be the result that described third phase closes the time of advent of then determining the described location reference signals that receives.
10. each described device is characterized in that according to claim 6-9, also comprises:
Judge module, be used for judging that whether the bandwidth of the described local location reference signals that produces and/or the described location reference signals that receives is more than or equal to the first predetermined value, and judge that whether described first search for the length of window more than or equal to the second predetermined value, if the bandwidth of the described local location reference signals that produces and/or the described location reference signals that receives more than or equal to the second predetermined value, is then carried out described abstraction module more than or equal to the length of the first predetermined value and described the first search window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210341503.6A CN102869091B (en) | 2012-09-14 | 2012-09-14 | Method and device for determining arrival time of location reference signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210341503.6A CN102869091B (en) | 2012-09-14 | 2012-09-14 | Method and device for determining arrival time of location reference signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102869091A true CN102869091A (en) | 2013-01-09 |
| CN102869091B CN102869091B (en) | 2015-01-21 |
Family
ID=47447605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210341503.6A Expired - Fee Related CN102869091B (en) | 2012-09-14 | 2012-09-14 | Method and device for determining arrival time of location reference signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102869091B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105532058A (en) * | 2013-09-07 | 2016-04-27 | 高通股份有限公司 | Blind search for network positioning reference signal (prs) configuration parameters |
| CN109923842A (en) * | 2016-11-16 | 2019-06-21 | 高通股份有限公司 | System and method in wireless network for supporting the various configurations of location reference signals |
| CN111163029A (en) * | 2019-12-27 | 2020-05-15 | 重庆物奇科技有限公司 | Method for searching positioning reference signal of enhanced machine type communication (e-MTC) |
| CN110381457B (en) * | 2019-08-29 | 2020-08-25 | 上海知白智能科技有限公司 | Indoor equipment positioning system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040102198A1 (en) * | 2002-11-27 | 2004-05-27 | Diener Neil R. | System and method for locating sources of unknown wireless radio signals |
| CN1787392A (en) * | 2005-12-16 | 2006-06-14 | 凯明信息科技股份有限公司 | Timing tracking and trapping device |
| CN101489238A (en) * | 2008-01-14 | 2009-07-22 | 大唐移动通信设备有限公司 | Time difference measuring method, system and apparatus |
| CN102131289A (en) * | 2011-04-20 | 2011-07-20 | 电子科技大学 | LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search |
-
2012
- 2012-09-14 CN CN201210341503.6A patent/CN102869091B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040102198A1 (en) * | 2002-11-27 | 2004-05-27 | Diener Neil R. | System and method for locating sources of unknown wireless radio signals |
| CN1787392A (en) * | 2005-12-16 | 2006-06-14 | 凯明信息科技股份有限公司 | Timing tracking and trapping device |
| CN101489238A (en) * | 2008-01-14 | 2009-07-22 | 大唐移动通信设备有限公司 | Time difference measuring method, system and apparatus |
| CN102131289A (en) * | 2011-04-20 | 2011-07-20 | 电子科技大学 | LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105532058A (en) * | 2013-09-07 | 2016-04-27 | 高通股份有限公司 | Blind search for network positioning reference signal (prs) configuration parameters |
| CN109923842A (en) * | 2016-11-16 | 2019-06-21 | 高通股份有限公司 | System and method in wireless network for supporting the various configurations of location reference signals |
| CN109923842B (en) * | 2016-11-16 | 2022-03-08 | 高通股份有限公司 | System and method for supporting multiple configurations of positioning reference signals in a wireless network |
| CN110381457B (en) * | 2019-08-29 | 2020-08-25 | 上海知白智能科技有限公司 | Indoor equipment positioning system and method |
| CN111163029A (en) * | 2019-12-27 | 2020-05-15 | 重庆物奇科技有限公司 | Method for searching positioning reference signal of enhanced machine type communication (e-MTC) |
| CN111163029B (en) * | 2019-12-27 | 2022-04-22 | 重庆物奇科技有限公司 | Method for searching positioning reference signal of enhanced machine type communication (e-MTC) |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102869091B (en) | 2015-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU782935B2 (en) | Base station identification in orthogonal frequency division multiplexing based spread spectrum multiple access systems | |
| CN102356671B (en) | Method and device of communication system frequency search | |
| CN108322277B (en) | Frequency spectrum sensing method based on inverse eigenvalue of covariance matrix | |
| CN102869091B (en) | Method and device for determining arrival time of location reference signals | |
| CN106713190B (en) | MIMO transmitting antenna number blind estimation calculation method based on random matrix theory and characteristic threshold estimation | |
| CN102546061A (en) | Self-adaptive time-frequency hole detection method based on wavelet transformation | |
| CN102271022B (en) | Spectrum sensing method based on maximum generalized characteristic value | |
| CN112968739A (en) | Short-wave emergency communication channel assessment and allocation method | |
| CN105721083A (en) | Frequency spectrum detection method based on autocorrelation energy | |
| KR101189943B1 (en) | Cognitive radio communication system engine unit using chaotic property | |
| CN101729163B (en) | Method and equipment for determining interference source of mobile communication | |
| CN102137051A (en) | Interference detection method used in wireless sensor network and detection device thereof | |
| KR102155419B1 (en) | Apparatus for adaptive distace measurement base on artificial neural networks | |
| KR20210128161A (en) | Recurrent neural network based spectrum sensing method and device for cognitive radio communications | |
| CN101013900A (en) | Method and apparatus for detecting intermediate code of cochannel cell of TD-SCDMA system | |
| CN1904639B (en) | Signal detection method using fractal characteristics value | |
| KR101154166B1 (en) | Method for analyzing performance of spectrum sensing methods for cognitive radio systems | |
| CN105357721B (en) | Neighbor cell detecting method and device | |
| Gong et al. | High order geometric range free localization in opportunistic cognitive sensor networks | |
| KR101347885B1 (en) | Apparatus for cognitive radio and method thereof | |
| JP6532976B2 (en) | Signal transmitting / receiving apparatus and method for detecting synchronization point in signal | |
| CN101944934B (en) | Intercarrier interference elimination-based cognitive OFDMA system carrier detection method | |
| CN105812104B (en) | Carrier polymerizing method and device and terminal device | |
| Treeumnuk et al. | Adaptive sensing for increased spectrum utilization in dynamic cognitive radio systems | |
| CN103763048A (en) | Authorized user detection method and system based on characteristic value |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170505 Address after: 510640 Guangdong City, Tianhe District Province, No. five, road, public education building, unit 371-1, unit 2401 Patentee after: Guangdong Gaohang Intellectual Property Operation Co., Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: Huawei Technologies Co., Ltd. |
|
| CB03 | Change of inventor or designer information |
Inventor after: Peng Yi Inventor after: Yang Can Inventor after: Lu Chenghua Inventor after: Chen Yongbo Inventor after: Mao Xiaohua Inventor before: Liu Jinnan Inventor before: Feng Shulan |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170523 Address after: 414000 Hunan Province, Yueyang City Economic Development Zone Industrial Park qikang Montevideo Road No. 28 Patentee after: HUNAN QIANMENG INDUSTRIAL INTELLIGENT SYSTEM CO., LTD. Address before: 510640 Guangdong City, Tianhe District Province, No. five, road, public education building, unit 371-1, unit 2401 Patentee before: Guangdong Gaohang Intellectual Property Operation Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20190914 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |