CN102869027A - Method and device for detecting physical random access channel (PRACH) of multi-antenna base station - Google Patents
Method and device for detecting physical random access channel (PRACH) of multi-antenna base station Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting a physical random access channel (PRACH) of a multi-antenna base station. The method comprises that the amplitude variance of the corresponding PRACH frequency domain data of each antenna is respectively obtained, and the corresponding antennas of the PRAC frequency domain data which has the amplitude variance being smaller than a variance threshold value are selected; an automatic gain control (AGC) factor of the corresponding PRACH frequency domain data of each selected antenna is determined; and the PRACH detection is carried out on the PRACH frequency domain data with the AGC factor being greater than the set threshold value. The method and a device are used for solving the problem of leak detection which is caused by over large processing quantity, overlong processing time and overtime processing of the PRACH detection of the base station which adopts a plurality of antennas in the prior art.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of PRACH detection method and device of multi-antenna base station.
Background technology
At LTE(Long Term Evolution, Long Term Evolution) in the system, random access procedure is a very the key link, and this process is UE(User Equipment, user terminal) with eNB(evolved Node B, evolved base station) sets up the prerequisite of communication link.No matter user terminal UE initially accesses the residential quarter afterwards in start, or carrying out the residential quarter in communication process switches, and all needs to rely on random access procedure and base station eNB to set up and contacts.Therefore, LTE PRACH(Physical Random Access Channel, Physical Random Access Channel) in the transmission plan of asynchronous UE and the access of LTE up-link wireless, played the part of crucial role.Generally send accidental access signal by user terminal, and the PRACH receiver is used for initiating this random access procedure.Because the PRACH receiver adopts the mode of blind check that accidental access signal is processed, when the base station has disposed 8 antennas, because the difference of the PRACH of each root antenna configuration, the PRACH receiver can become multiple to increase to the treating capacity of accidental access signal, and the base station need to guarantee normal situation decline of processing time low complex degree, reduce amount of calculation, avoid undetected and empty inspection, therefore, the processing pressure of base station also increases along with the increase of the antenna amount that disposes.
In the present LTE system, the frame structure of PRACH time-domain signal as shown in Figure 1, comprises CP(Cyclic prefix, Cyclic Prefix), the preamble(lead code) sequence and GT(Guard Time, the protection time slot).
Table 1 is the parameter value of lead code, and these values are by frame structure and at random access configuration decision.
Table 1
| The lead code form | T CP | T SEQ |
| 0 | 3168·T s | 24576· |
| 1 | 21024·T s | 24576· |
| 2 | 6240· |
2·24576· |
| 3 | 21024· |
2·24576· |
| 4 * | 448·T s | 4096·T s |
4
*Being only applicable to the UpPTS(Uplink Pilot Time Slot in the frame structure type 2, uplink subframe time slot) length is 4384T
sAnd 5120T
sSpecial subframe configuration.Change-over period be 5ms Type2 frame structure (being frame structure type 2) schematic diagram as shown in Figure 6.
In the LTE system, the PRACH receiver adopts the method for mixed time domain and frequency domain, the PRACH data of each root antenna in the base station of 8 antennas have been disposed in calculating, the PRACH data of each root antenna are gone respectively CP processing, time domain data frequency spectrum shift, time domain data filtering, down-sampling, FFT conversion and frequency domain AGC module, send into again and carry out demodulation in the PRACH demodulation module, be illustrated in fig. 2 shown below, wherein, K is configurating base station reception antenna number.
In the PRACH of each root antenna data through processing and when entering the Serial relation module of PRACH receiver each ZC(Zadoff-Chu this residential quarter in, the pseudo-stack) the root sequence respectively with each root reception antenna on data carry out the Serial relation computing.And the number of operations that carries out the Serial relation computing is N
Root* K
Ant(N
RootBe the ZC root sequence quantity that each residential quarter needs, K
AntBe the reception antenna number), according to the Zadoff-Chu root sequence generation preamble sequence of 3GPP TS36.211 agreement by one or more zero correlations, the length of preamble sequence is as shown in table 2, adopting the length of the preamble sequence (namely having adopted the preamble sequence of lead code form 0 or form 1 or form 2 or form 3) of lead code form 1 ~ 3 is 839, is 139 and adopt the length of the preamble sequence of lead code format 4.
Table 2
(preamble sequence length)
| The lead | N | ZC |
| 0~3 | 839 | |
| 4 | 139 |
Each residential quarter need to dispose 64 preamble sequences.In the time can't generating 64 preamble sequences by a Zadoff-Chu root sequence, can go out by the logic index search in the PRACH receiver corresponding Zadoff-Chu root sequence and generate remaining preamble sequence, so that the sum of the random access lead code of configuration reaches 64 in each residential quarter.When generating the preamble sequence, the relevant Zadoff-Chu root sequence number of this locality of use storage is determined according to following table 3, table 4 by 3GPP TS 36.211 agreements.Table 3 is for generating the required N of preamble sequence that has adopted lead code form 0 ~ 3
CSValue.
Table 3
Table 4 is for generating the required N of preamble sequence that has adopted the lead code format 4
CSValue.
Table 4
In present LTE agreement regulation and implementation, be applied in situation in the different scenes for satisfying up PRACH, the base station need to dispose different lead code format configuration and N
CSConfiguration.Because N
CSThe N of configuration
CSThe ZC root sequence quantity that the root sequence index that value produces needs for each residential quarter, when ZC root sequence quantity is 64 to the maximum, if the configuration of 8 antennas has been adopted in the base station, can cause the calculating of Serial relation need to carry out 64*8 (namely 512 times) root Serial relation operation, and IDFT(Inverse Discrete Fourier Transform, inverse discrete Fourier transform) operation also need to carry out 64*8 time.Obviously, available technology adopting the base station of many antennas excessive for the treating capacity that PRACH detects, the problem that processing time is long, and when next time PRACH detection beginning, if detecting, this PRACH also has uncompleted operating procedure, then undetected phenomenon can occur, affect normal random access procedure.
Summary of the invention
The embodiment of the invention provides a kind of PRACH detection method and device of multi-antenna base station, in order to solve the employing that exists in the prior art base station of many antennas treating capacity that PRACH is detected excessive and the processing time is long and process the overtime undetected problem that causes.
The concrete technical scheme that the embodiment of the invention provides is as follows:
A kind of PRACH detection method of multi-antenna base station comprises:
Obtain respectively the amplitude variance of the frequency domain data of PRACH corresponding to each root antenna, the amplitude variance of choosing is not more than antenna corresponding to frequency domain data of the PRACH of variance threshold value;
Determine the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root chooses is corresponding;
The AGC factor is carried out PRACH greater than the frequency domain data of the PRACH of setting threshold to be detected.
A kind of PRACH checkout gear of multi-antenna base station comprises:
The first judge module obtains respectively the amplitude variance of the frequency domain data of PRACH corresponding to each root antenna, and the amplitude variance of choosing is not more than antenna corresponding to frequency domain data of the PRACH of variance threshold value;
Determination module is determined the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root chooses is corresponding;
Detection module carries out PRACH to the AGC factor greater than the frequency domain data of the PRACH of setting threshold and detects.
The embodiment of the invention judges by the PRACH signal and frequency domain AGC judges two operations, optimized the handling process that many antennas PRACH is detected, the number of times that carries out Serial relation detection and IDFT and the data that have reduced in the PRACH testing process merge the antenna number of processing, can be when not affecting the detection performance, effectively antenna is chosen, be reduced in operand in the PRACH detection, reduce processing time and treating capacity that the base station is detected PRACH, reduce the undetected problem of processing the overtime PRACH that causes, can improve the success rate that PRACH detects.
Description of drawings
Fig. 1 is the frame structure schematic diagram of the time-domain signal of PRACH of the prior art;
Fig. 2 is the process that the PRACH receiver is processed accidental access signal in the prior art;
Fig. 3 is that variance is 0.1 correct PRACH frequency domain data constellation point diagram in the embodiment of the invention;
Fig. 4 is the PRACH overhaul flow chart of the multi-antenna base station in the embodiment of the invention;
Fig. 5 is the PRACH testing process schematic diagram of the embodiment of the invention;
Fig. 6 is to be the Type2 frame structure schematic diagram of 5ms the change-over period;
Fig. 7 is the PRACH checkout gear schematic diagram in the embodiment of the invention.
Embodiment
According to the regulation of present LTE protocol scheme, the base station is more in the number of antennas of configuration, and the ZC root sequence quantity that each residential quarter needs is larger, like this can be so that the treating capacity of base station increase, and it is overtime to be easy to cause PRACH to process, and affects the at random access of user terminal.
For fear of PRACH access at random undetected, the embodiment of the invention is improved the handling process that PRACH detects, choosing the PRACH signal quality preferably during antenna, can carry out signal electing according to the PRACH frequency domain data that has carried out in the PRACH receiver after the FFT conversion, because the good PRACH signal of signal to noise ratio is made of the Zadoff-Chu sequence, it has the good permanent width of cloth zero autocorrelation performance, a lot of characteristics are also arranged, wherein the most obvious be exactly the permanent width of cloth characteristic of PRACH data on frequency domain of having carried out after the FFT conversion be that signal amplitude and variance are all very little, planisphere is circular.The constellation point diagram of the PRACH frequency domain data of the second best in quality PRACH signal after having carried out the FFT conversion as shown in Figure 3.
The embodiment of the invention is by calculating the amplitude variance of the PRACH frequency domain data after the FFT conversion, with given threshold value relatively, judge that take this PRACH signal corresponding to this PRACH frequency domain data is whether as quality signal preferably.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
The flow chart of the PRACH detection method of the multi-antenna base station of embodiment of the invention design is as shown in Figure 4:
Step 401:PRACH receiver receives respectively corresponding time-domain signal by many antennas.
In the embodiment of the invention, the frame structure of the time-domain signal of PRACH comprises CP, preamble sequence and protection time slot GT
Suppose that there is M root antenna the base station, the PRACH receiver then receives respectively corresponding time-domain signal by this M root antenna and deposits in the PRACH receiver.
Step 402:PRACH receiver respectively to each root antenna reception to time-domain signal go cyclic prefix CP to process, obtain each root antenna corresponding remove time domain data behind the CP.
Particularly, by the PRACH receiver to each root antenna reception to time-domain signal go CP to process, keep preamble sequence and GT part.
Step 403:PRACH receiver carries out the time domain data frequency spectrum shift to the time domain data behind the CP that goes corresponding to each root antenna respectively, then carries out time domain data filtering and down-sampling, and then carries out the FFT conversion, obtains the frequency domain data of corresponding PRACH.
Step 404:PRACH receiver obtains respectively the amplitude variance of the frequency domain data of PRACH corresponding to each root antenna, the amplitude variance of choosing is not more than antenna corresponding to frequency domain data of the PRACH of variance threshold value, determine the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root chooses is corresponding, the AGC factor is carried out PRACH greater than the frequency domain data of the PRACH of setting threshold detect.
In actual applications, step 404 can also realize by following three steps:
Step 1: the PRACH receiver is analyzed the frequency domain data of PRACH corresponding to each root antenna respectively, calculate the amplitude variance of PRACH frequency domain data corresponding to each root antenna, P compares with the variance threshold value: if greater than variance threshold value P, judge that then current frequency domain data is incorrect, the sky wire size that current frequency domain data is corresponding deposits antenna sets K in
BadIn; If be not more than variance threshold value P, judge that then PRACH frequency domain data corresponding to current frequency domain data is correct and good, deposit current sky wire size in antenna sets K
GoodIn, judge whether PRACH frequency domain data corresponding to whole antennas all greater than threshold value, if then carry out step 2, otherwise carry out step 3.
Step 2: carry out alarm, withdraw from many antennas PRACH testing process.
Step 3: the PRACH frequency domain data corresponding to each root antenna respectively, carry out frequency domain AGC(Automatic Gain Control, automatic gain control) process, draw the AGC factor of PRACH frequency domain data corresponding to each root antenna, the antenna sets K in the obtaining step one
GoodIn the frequency domain AGC factor corresponding to antenna, and compare with the threshold value of setting, obtaining the AGC frequency domain factor greater than the threshold value of setting, the antenna that these AGC frequency domain factor pairs are answered carries out the subsequent operation of PRACH in detecting, and other antenna is not done subsequent treatment, to reduce amount of calculation.
Step 405: obtain the AGC factor greater than the number N of the frequency domain data respective antenna of the PRACH of setting threshold:
If N=0 then carries out alarm, withdraw from many antennas PRACH testing process;
If N=1 then carries out Serial relation to frequency domain data corresponding to antenna of finding out and detects and inverse discrete Fourier transform IDFT, then carry out follow-up PRACH testing process, namely carry out step 408;
If 1〉N〉M, then frequency domain data corresponding to antenna of finding out carried out that Serial relation detects and IDFT after, carry out data and merge, then carry out follow-up PRACH testing process (namely carry out step 408), wherein, M is that the antenna of base station is total.
Particularly, the PRACH receiver can obtain from K
Good(N is not more than K to the AGC factor of the frequency domain data of the PRACH of the correspondence of finding out in the antenna sets greater than the number N of the antenna number of setting threshold
GoodAntenna number in the group).
In the practical application, the number of antennas N that disposed 8 antennas in the base station, need to select is 4, system bandwidth is configured to 20M, preamble sequence has adopted in the situation of lead code form 0, and above-mentioned steps 401 is to the detailed process of step 405, can for:
The PRACH receiver by 8 antenna receptions to the total quantity of time domain data be 8*30720, after processing, past CP becomes 8*24576, after through time domain data filtering and down-sampling, become 8*2048, carry out the FFT conversion, the PRACH frequency domain data quantity that extracts is 8*839, with these 8 antennas respectively corresponding 839 frequency domain datas carry out frequency domain data and judge that antenna corresponding to frequency domain data of selecting greater than variance threshold value P deposits antenna sets K in
GoodIn (at this moment, K
GoodIn antenna number normally should be between 4 to 8), PRACH frequency domain data corresponding to each root antenna carried out frequency domain AGC processes, obtain the respectively corresponding AGC factor of every antenna data, with antenna sets K
GoodIn antenna respectively the corresponding A GC factor compare and arrange by order from big to small, the antenna that front 4 AGC factor pairs are answered is selected the subsequent operation during the PRACH that comprises Serial relation etc. detects.
Step 406: data are carried out signal power calculate and noise power calculation, and judge whether signal access with the preamble sequence according to the signal power that calculates and noise power, if the signal access with the preamble sequence is arranged, then confirms to detect the PRACH signal; Otherwise, judge not detect the PRACH signal.Step 408 is follow-up PRACH input flow process.
So far, the PRACH of multi-antenna base station detects and finishes.
The embodiment of the invention has also designed a kind of Physical Random Access Channel PRACH checkout gear of multi-antenna base station as shown in Figure 7, specifically comprises following module.
Go CP module 702, be used for respectively to each root antenna reception to time-domain signal go cyclic prefix CP to process, obtain each root antenna corresponding remove time domain data behind the CP.
The first judge module 704, be used for obtaining respectively the amplitude variance of the frequency domain data of PRACH corresponding to each root antenna, the amplitude variance of choosing is not more than antenna corresponding to frequency domain data of the PRACH of variance threshold value, if and the amplitude variance of frequency domain data that is used for obtaining PRACH corresponding to each root antenna is all greater than the variance threshold value, then carry out alarm, withdraw from many antennas PRACH testing process.
If N=0 then carries out alarm, withdraw from many antennas PRACH testing process;
If N=1 then carries out Serial relation to each AGC factor greater than the frequency domain data of the PRACH of setting threshold and detects and inverse discrete Fourier transform IDFT, then carry out the PRACH input;
If N is greater than 1 and less than the antenna of base station sum, then each AGC factor is carried out greater than the frequency domain data of the PRACH of setting threshold that Serial relation detects and inverse discrete Fourier transform IDFT after, carry out the data merging, then carry out the PRACH input.
In the LTE system, the frame structure of the time-domain signal of above-mentioned PRACH comprises CP, preamble sequence and protection time slot GT.
The embodiment of the invention has been not limited only to dispose the base station of 8 antennas, also can be applied to adopt in the base station of spaced antenna configuration or other different antenna configurations, finishing PRACH detects, and the embodiment of the invention only choose the PRACH signal quality preferably antenna carry out follow-up Serial relation detection, IDFT and data and merge and process, can become like this treating capacity of the reduction PRACH of multiple, and finish PRACH normally, on time and process.
Method and device that a kind of PRACH of embodiment of the invention design detects, utilize PRACH frequency domain data characteristic and the frequency domain AGC factor to judge whether the PRACH signal is good, reduced and to have carried out the antenna amount that Serial relation detection, IDFT and data merge processing, can be when not affecting the detection performance, effectively antenna is chosen, be reduced in operand in the PRACH detection, reduce processing time and treating capacity that the base station is detected PRACH, reduce the undetected problem of processing the overtime PRACH that causes, can improve the success rate that PRACH detects.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device producing a machine, so that the instruction of carrying out by the processor of computer or other programmable data processing device produces the device of the function that is used for being implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, so that the instruction that is stored in this computer-readable memory produces the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, so that carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the embodiment of the invention and not break away from the spirit and scope of the embodiment of the invention.Like this, if these of the embodiment of the invention are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. the Physical Random Access Channel PRACH detection method of a multi-antenna base station is characterized in that, comprising:
Obtain respectively the amplitude variance of the frequency domain data of PRACH corresponding to each root antenna, the amplitude variance of choosing is not more than antenna corresponding to frequency domain data of the PRACH of variance threshold value;
Determine the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root chooses is corresponding;
The AGC factor is carried out PRACH greater than the frequency domain data of the PRACH of setting threshold to be detected.
2. the method for claim 1 is characterized in that, before the amplitude variance of the frequency domain data that obtains respectively PRACH corresponding to each root antenna, comprising:
Receive respectively corresponding time-domain signal by many antennas;
Respectively to each root antenna reception to time-domain signal go cyclic prefix CP to process, obtain each root antenna corresponding remove time domain data behind the CP;
Respectively the time domain data behind the CP that goes corresponding to each root antenna carried out time domain data frequency spectrum shift, time domain data filtering, down-sampling and fast Fourier transform FFT conversion, obtain the frequency domain data of corresponding PRACH.
3. the method for claim 1 is characterized in that, describedly the AGC factor is carried out PRACH greater than the frequency domain data of the PRACH of setting threshold detects, and comprising:
Obtain the AGC factor greater than the number N of the frequency domain data respective antenna of the PRACH of setting threshold:
If N=0 then carries out alarm, withdraw from many antennas PRACH testing process;
If N=1 then carries out Serial relation to each AGC factor greater than the frequency domain data of the PRACH of setting threshold and detects and inverse discrete Fourier transform IDFT, then carry out the PRACH input;
If N is greater than 1 and less than the antenna of base station sum, then each AGC factor is carried out greater than the frequency domain data of the PRACH of setting threshold that Serial relation detects and inverse discrete Fourier transform IDFT after, carry out the data merging, then carry out the PRACH input.
4. method as claimed in claim 3 is characterized in that, described PRACH input comprises:
The data of obtaining are carried out signal power to be calculated and noise power calculation, and judge whether signal access with preamble sequence according to the signal power that calculates and noise power, if have, then judge to detect the PRACH signal is arranged among the PRACH, otherwise judging to detect does not have the PRACH signal among the PRACH.
5. the method for claim 1 is characterized in that, also comprises:
If obtain the amplitude variance of frequency domain data of PRACH corresponding to described each root antenna all greater than the variance threshold value, then carry out alarm, withdraw from many antennas PRACH testing process.
6. the method for claim 1 is characterized in that, also comprises:
Determine the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root is not selected is corresponding.
7. such as each described method among the claim 1-6, it is characterized in that,
In the LTE system, the frame structure of the time-domain signal of PRACH comprises CP, preamble sequence and protection time slot GT.
8. the Physical Random Access Channel PRACH checkout gear of a multi-antenna base station is characterized in that, comprising:
The first judge module obtains respectively the amplitude variance of the frequency domain data of PRACH corresponding to each root antenna, and the amplitude variance of choosing is not more than antenna corresponding to frequency domain data of the PRACH of variance threshold value;
Determination module is determined the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root chooses is corresponding;
Detection module carries out PRACH to the AGC factor greater than the frequency domain data of the PRACH of setting threshold and detects.
9. device as claimed in claim 8 is characterized in that, also comprises:
Receiver module is used for receiving respectively corresponding time-domain signal by many antennas;
Go the CP module, be used for respectively to each root antenna reception to time-domain signal go cyclic prefix CP to process, obtain each root antenna corresponding remove time domain data behind the CP;
Conversion module is used for respectively the time domain data behind the CP that goes corresponding to each root antenna carried out time domain data frequency spectrum shift, time domain data filtering, down-sampling and fast Fourier transform FFT conversion, obtains the frequency domain data of corresponding PRACH.
10. device as claimed in claim 8 is characterized in that, described detection module also is used for:
Obtain the AGC factor greater than the number N of the frequency domain data respective antenna of the PRACH of setting threshold:
If N=0 then carries out alarm, withdraw from many antennas PRACH testing process;
If N=1 then carries out Serial relation to each AGC factor greater than the frequency domain data of the PRACH of setting threshold and detects and inverse discrete Fourier transform IDFT, then carry out the PRACH input;
If N is greater than 1 and less than the antenna of base station sum, then each AGC factor is carried out greater than the frequency domain data of the PRACH of setting threshold that Serial relation detects and inverse discrete Fourier transform IDFT after, carry out the data merging, then carry out the PRACH input.
11. device as claimed in claim 10 is characterized in that, also comprises signal detection module, is used for carrying out described PRACH input, specifically comprises:
The data of obtaining are carried out signal power to be calculated and noise power calculation, and judge whether signal access with preamble sequence according to the signal power that calculates and noise power, if have, then judge to detect the PRACH signal is arranged among the PRACH, otherwise judging to detect does not have the PRACH signal among the PRACH.
12. device as claimed in claim 8 is characterized in that, described the first judge module also is used for,
If obtain the amplitude variance of frequency domain data of PRACH corresponding to described each root antenna all greater than the variance threshold value, then carry out alarm, withdraw from many antennas PRACH testing process.
13. device as claimed in claim 8 is characterized in that, described determination module also is used for,
Determine the automatic gain control AGC factor of the frequency domain data of the PRACH that antenna that each root is not selected is corresponding.
14. such as each described device among the claim 8-13, it is characterized in that,
In the LTE system, PRACH is comprised of CP, preamble sequence and protection time slot GT.
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| CN104507110A (en) * | 2014-12-25 | 2015-04-08 | 中国电子科技集团公司第四十一研究所 | Precise detection method of PRACHs (physical random access channels) for LTE-FDD (long-term evolution-frequency division duplex) |
| CN110198567B (en) * | 2018-02-26 | 2021-11-26 | 深圳市中兴微电子技术有限公司 | Random access detection method and device |
| CN110198567A (en) * | 2018-02-26 | 2019-09-03 | 深圳市中兴微电子技术有限公司 | A kind of random access detecting method and device |
| CN109792622B (en) * | 2018-06-11 | 2021-11-09 | 香港应用科技研究院有限公司 | Method for physical random access channel PRACH signal recovery and frequency domain PRACH filter |
| WO2019237311A1 (en) * | 2018-06-11 | 2019-12-19 | Hong Kong Applied Science and Technology Research Institute Company Limited | Frequency domain prach filter for prach signal recovery |
| US10448432B1 (en) | 2018-06-11 | 2019-10-15 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Frequency domain PRACH filter for PRACH signal recovery |
| CN109792622A (en) * | 2018-06-11 | 2019-05-21 | 香港应用科技研究院有限公司 | The frequency domain PRACH filtering restored for PRACH signal |
| CN111328088A (en) * | 2018-12-17 | 2020-06-23 | 华为技术有限公司 | PRACH detection method and device |
| WO2020125616A1 (en) * | 2018-12-17 | 2020-06-25 | 华为技术有限公司 | Prach detection method and device |
| CN111328088B (en) * | 2018-12-17 | 2021-12-03 | 华为技术有限公司 | PRACH detection method and device |
| US11910443B2 (en) | 2018-12-17 | 2024-02-20 | Huawei Technologies Co., Ltd. | PRACH detection method and apparatus |
| CN112689335A (en) * | 2019-10-18 | 2021-04-20 | 深圳市中兴微电子技术有限公司 | Data merging method and device for random access channel |
| WO2021073632A1 (en) * | 2019-10-18 | 2021-04-22 | 深圳市中兴微电子技术有限公司 | Data merging method and apparatus of physical random access channel, and storage medium |
| CN114745729A (en) * | 2022-04-26 | 2022-07-12 | 上海中兴易联通讯股份有限公司 | Method and device for combining PRACH (physical random Access channel) baseband of NR (non-reciprocal) small base station |
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