CN102447532B - Preamble detection method and device for same - Google Patents
Preamble detection method and device for same Download PDFInfo
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- CN102447532B CN102447532B CN201210017995.3A CN201210017995A CN102447532B CN 102447532 B CN102447532 B CN 102447532B CN 201210017995 A CN201210017995 A CN 201210017995A CN 102447532 B CN102447532 B CN 102447532B
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Abstract
The invention discloses a preamble detection method and a device for the same, which are used for avoiding the problem of preamble virtual detection, even omission, caused by non-ideal time delay in the prior art. The preamble detection method provided by the invention comprises the following steps of: presetting a certain number of sampling points in advance according to a time-frequency position of a PRACH (Physical Random Access Channel), and extracting time-domain data of the PRACH; based on the time-domain data of the PRACH, judging whether a correlation peak meeting the preset conditions exists in each detection window corresponding to the preamble_id; and for the detection window which contains the correlation peak meeting the preset conditions, determining the preamble_id and the timing advance (TA) corresponding to the detection window.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of lead code (Preamble) detection method and device.
Background technology
The physical layer procedure of the random access of TD-SCDMA Long Term Evolution (TD-LTE) system is used Zadoff-Chu sequence as uplink synchronous code, be lead code (Preamble), on Physical Random Access Channel (Packet Random Access CHannel, PRACH), send.
In the time that transmitted signal arrives evolved base station (eNB) through wireless channel, receiving terminal first carries out OFDM (Orthogonal Frequency Division Multiplex, OFDM) separating mediation shines upon according to PRACH running time-frequency resource position demodulation running time-frequency resource, then, frequency domain sequence is correlated with local root sequence, access the validity judge according to the peak of being correlated with out and watt level, so far complete the testing process of Preamble code.
Wherein, according to LTE physical layer protocol, different lead code marks (preamble_id) can be used same root sequence to produce by cyclic shift, so at present in the time detecting, calculate its corresponding detection window according to cyclic shift corresponding to preamble_id, if there is the peak value that meets judgment condition in detection window, thinks and have terminal to use this preamble_id to initiate random access;
According to emulation and actual test result, if Installed System Memory is in imperfect time delay, can there is disperse in peak power, for example, and as shown in Figure 1, be equipped with a spike in window start bit corresponding to preamble_id=5, can be determined with terminal according to this peak and use preamble_id=5 to initiate random access, but because peak power sends disperse, also there will be a secondary peak at the end of previous window, this secondary peak also may be judged to be qualified relevant peaks at last window, causes empty inspection.
In sum, in prior art LTE system, exist due to imperfect time delay and nonlinear impact cause base station to occur in the time detecting preamble before exit window, cause empty inspection or undetected problem.
Summary of the invention
The embodiment of the present invention provides a kind of preamble detection method and device, in order to the even undetected problem of the empty inspection of preamble of avoiding bringing due to imperfect time delay in prior art.
A kind of preamble detection method that the embodiment of the present invention provides comprises:
According to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, the time domain data of extraction PRACH channel;
Utilize the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks;
For there being the detection window that meets pre-conditioned relevant peaks, determine the preamble_id that this detection window is corresponding, and timing advance TA.
A kind of preamble checkout gear that the embodiment of the present invention provides comprises:
PRACH channel time domain data extracting unit, for according to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, extracts the time domain data of PRACH channel;
Judge processing unit, for utilizing the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks;
Determining unit, for for there being the detection window that meets pre-conditioned relevant peaks, determines the preamble_id that this detection window is corresponding, and timing advance TA.
The embodiment of the present invention, by according to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, extracts the time domain data of PRACH channel; Utilize the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks; For there being the detection window that meets pre-conditioned relevant peaks, determine the preamble_id that this detection window is corresponding, and timing advance TA, thereby solve in LTE system, due to imperfect time delay and nonlinear impact cause base station to occur in the time detecting preamble before exit window, cause empty inspection or undetected problem.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the peak value detection window that exemplifies in prior art;
The overall procedure schematic diagram of a kind of preamble detection method that Fig. 2 provides for the embodiment of the present invention;
The idiographic flow schematic diagram of a kind of preamble detection method that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram of the extraction time-domain signal that Fig. 4 provides for the embodiment of the present invention;
The structural representation of a kind of preamble checkout gear that Fig. 5 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of preamble detection method and device, in order to the even undetected problem of the empty inspection of preamble of avoiding bringing due to imperfect time delay in prior art.
Referring to Fig. 2, a kind of preamble detection method that the embodiment of the present invention provides, totally comprises step:
S101, according to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, extracts the time domain data of PRACH channel;
S102, utilize the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks;
S103, for there being the detection window that meets pre-conditioned relevant peaks, determine the preamble_id that this detection window is corresponding, and timing advance TA.
Preferably, the described time domain data that utilizes PRACH channel, in detection window corresponding to each lead code mark preamble_id, judges whether to meet pre-conditioned relevant peaks, comprising:
By fast fourier transform FFT, the time domain data of PRACH channel is transformed to frequency domain, and according to the frequency domain position of PRACH channel, therefrom extract PRACH channel frequency domain data;
PRACH channel frequency domain data and local root sequence code are carried out to related operation, obtain correlated results;
Correlated results is divided into multiple detection window, the corresponding detection window of each preamble_id;
In detection window corresponding to each preamble_id, judge whether to meet pre-conditioned relevant peaks.
Referring to Fig. 3, a kind of preamble detection method that the embodiment of the present invention provides, specifically comprises step:
S201, according to the time-frequency position of PRACH channel, on the basis of theoretical position, carry top n sampled point and extract the time domain data of PRACH channel.
Wherein, while extracting the time domain data of PRACH channel, as shown in Figure 4, time window has shifted to an earlier date N time slot (Ts);
Wherein, N is less than Ncs*K for being greater than 0
tAarbitrary Digit, Ncs represents between zero correlation block, K
tA=T
sEQ/ N
zC, T
sEQbe the length of a preamble symbol, N
zCfor the length of Zadoff-Chu sequence, N specifically can set according to commissioning;
S202, the time domain data of PRACH channel is transformed to frequency domain through fast fourier transform (Fast Fourier Transform, FFT).
S203, according to the frequency domain position of PRACH channel, in the frequency domain data obtaining, extract PRACH channel frequency domain data from step S202.
S204, discrete Fourier transform (DFT) result phase dot product by PRACH channel frequency domain data with local root sequence code, and do inverse discrete Fourier transform (IDFT) conversion, complete related operation, obtain correlated results.
It should be noted that, in the embodiment of the present invention, be not limited to adopt above-mentioned related algorithm to carry out related operation, can also adopt other algorithms to carry out related operation.
S205, according to (Ncs) between zero correlation block, calculate the original position of the detection window that each preamble_id is corresponding, thereby determine the relevant peaks in each detection window.And in each detection window, relevant peaks is adjudicated, find the relevant peaks that whether has symbol judgement condition.
If there is qualified relevant peaks, illustrate there being terminal to use this preamble_id to do random access.
S206, according to the deviant n of the original position of the relevant peaks in detection window and this detection window (this value is the constant pre-setting), calculate Timing Advance (TA):
TA＝n×K
TA
Wherein, K
tA=T
sEQ/ N
zC, T
sEQbe the length of a preamble symbol, N
zCfor the length of Zadoff-Chu sequence.
S207, owing to extract the time domain data of PRACH channel in step S201 time, time domain is got window and is carried top n time slot, so the TA result that step S206 calculates also can be bigger than normal, need to revise TA, obtain revised TA ', wherein, in the time of TA-N > 0, TA '=TA-N; Otherwise, TA '=0.
Referring to Fig. 5, a kind of preamble checkout gear that the embodiment of the present invention provides, comprising:
PRACH channel time domain data extracting unit 11, for according to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, extracts the time domain data of PRACH channel;
Judge processing unit 12, for utilizing the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks;
Determining unit 13, for for there being the detection window that meets pre-conditioned relevant peaks, determines the preamble_id that this detection window is corresponding, and timing advance TA.
Preferably, described judgement processing unit 12, specifically for:
By fast fourier transform FFT, the time domain data of PRACH channel is transformed to frequency domain, and according to the frequency domain position of PRACH channel, therefrom extract PRACH channel frequency domain data;
PRACH channel frequency domain data and local root sequence code are carried out to related operation, obtain correlated results;
Correlated results is divided into multiple detection window, the corresponding detection window of each preamble_id;
In detection window corresponding to each preamble_id, judge whether to meet pre-conditioned relevant peaks.
Preferably, described judgement processing unit 12, for there being the detection window that meets pre-conditioned relevant peaks, adopts following formula to determine the TA that this detection window is corresponding:
TA＝n×K
TA
Wherein, n represents the deviant of the original position of relevant peaks in detection window and this detection window, K
tA=T
sEQ/ N
zC, T
sEQfor the length of each preamble symbol, N
zCfor the length of Zadoff-Chu sequence.
Preferably, this device also comprises:
Amending unit 14, for according to the time slot of described predetermined number, revises timing advance TA.
Preferably, described amending unit 14, in the following way timing advance TA is revised:
In the time of TA-N > 0, TA '=TA-N; Otherwise, TA '=0;
Wherein, TA ' is revised Timing Advance, the time slot that N is described predetermined number.
In sum, the technical scheme that the embodiment of the present invention provides, in advance fixing while being to extract PRACH time domain data, cause correlation peak cyclic shift, even if guarantee there is power disperse, after disperse, peak value and secondary peak can be in former detection window, then in the time that TA calculates, the TA error correction that cyclic shift is brought, in not affecting accuracy of detection, prevents the generation of the empty inspection of pramble; According to measured result, the embodiment of the present invention can be in not affecting accuracy of detection, effectively prevents the generation of the empty inspection of preamble.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the present invention can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or 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 to produce a machine, the instruction that makes to carry out by the processor of computer or other programmable data processing device produces the device for realizing the function of specifying at flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
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, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame on computer or other programmable devices.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (6)
1. a lead code preamble detection method, is characterized in that, the method comprises:
According to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, the time domain data of extraction PRACH channel;
Utilize the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks;
For there being the detection window that meets pre-conditioned relevant peaks, determine the preamble_id that this detection window is corresponding, and timing advance TA;
According to the time slot of described predetermined number, in the following way timing advance TA is revised:
In the time of TA – N>0, TA '=TA – N; Otherwise, TA '=0;
Wherein, TA ' is revised Timing Advance, the time slot that N is described predetermined number.
2. method according to claim 1, is characterized in that, the described time domain data that utilizes PRACH channel, in detection window corresponding to each lead code mark preamble_id, judges whether to meet pre-conditioned relevant peaks, comprising:
By fast fourier transform FFT, the time domain data of PRACH channel is transformed to frequency domain, and according to the frequency domain position of PRACH channel, therefrom extract PRACH channel frequency domain data;
PRACH channel frequency domain data and local root sequence code are carried out to related operation, obtain relevant peaks;
Determine the relevant peaks in each detection window, and in each detection window, judge whether to meet pre-conditioned relevant peaks.
3. method according to claim 1, is characterized in that, for there being the detection window that meets pre-conditioned relevant peaks, adopts following formula to determine the TA that this detection window is corresponding:
TA＝n×K
TA
Wherein, n represents the deviant of the original position of relevant peaks in detection window and this detection window, K
tA=T
sEQ/ N
zC, T
sEQfor the length of each preamble symbol, N
zCfor the length of Zadoff-Chu sequence.
4. a preamble checkout gear, is characterized in that, this device comprises:
PRACH channel time domain data extracting unit, for according to the time-frequency position of Physical Random Access Channel PRACH, the sampled point of preset in advance quantity, extracts the time domain data of PRACH channel;
Judge processing unit, for utilizing the time domain data of PRACH channel, in detection window corresponding to each lead code mark preamble_id, judge whether to meet pre-conditioned relevant peaks;
Determining unit, for for there being the detection window that meets pre-conditioned relevant peaks, determines the preamble_id that this detection window is corresponding, and timing advance TA;
Amending unit, for according to the time slot of described predetermined number, in the following way timing advance TA is revised:
In the time of TA – N>0, TA '=TA – N; Otherwise, TA '=0;
Wherein, TA ' is revised Timing Advance, the time slot that N is described predetermined number.
5. device according to claim 4, is characterized in that, described judgement processing unit, specifically for:
By fast fourier transform FFT, the time domain data of PRACH channel is transformed to frequency domain, and according to the frequency domain position of PRACH channel, therefrom extract PRACH channel frequency domain data;
PRACH channel frequency domain data and local root sequence code are carried out to related operation, obtain correlated results;
Correlated results is divided into multiple detection window, the corresponding detection window of each preamble_id;
In detection window corresponding to each preamble_id, judge whether to meet pre-conditioned relevant peaks.
6. device according to claim 4, is characterized in that, described judgement processing unit, for there being the detection window that meets pre-conditioned relevant peaks, adopts following formula to determine the TA that this detection window is corresponding:
TA＝n×K
TA
Wherein, n represents the deviant of the original position of relevant peaks in detection window and this detection window, K
tA=T
sEQ/ N
z, T
sEQfor the length of each preamble symbol, N
zCfor the length of Zadoff-Chu sequence.
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| CN104186020B (en) * | 2013-01-22 | 2017-11-03 | 华为技术有限公司 | The method and apparatus of competitive Stochastic accessing |
| CN104010377B (en) * | 2013-02-22 | 2018-01-19 | 中兴通讯股份有限公司 | Strengthen the method and apparatus of WCDMA system detection of preamble disposal ability |
| CN104640195B (en) * | 2013-11-13 | 2018-03-30 | 普天信息技术研究院有限公司 | A kind of method for transmitting data |
| CN108631903B (en) | 2017-03-22 | 2019-09-17 | 电信科学技术研究院 | A kind of PRACH lead code sequence determines method and device |
| CN108882388B (en) * | 2017-05-10 | 2021-06-11 | 大唐移动通信设备有限公司 | Random access method and base station |
| CN111385041B (en) * | 2018-12-28 | 2021-04-16 | 大唐移动通信设备有限公司 | Method and device for measuring interference noise intensity and storage medium |
| CN110881215B (en) * | 2019-11-20 | 2021-11-30 | 重庆邮电大学 | Five-window combined timing advance estimation calibration method and system thereof |
| CN112702774B (en) * | 2020-12-11 | 2022-09-02 | 杭州红岭通信息科技有限公司 | Method for processing base station side of access channel |
| CN115426721A (en) * | 2022-07-31 | 2022-12-02 | 无锡格跃科技有限公司 | Random access processing method |
| CN115801213B (en) * | 2023-01-09 | 2023-04-11 | 四川创智联恒科技有限公司 | Planning method for random access sequence |
| CN116528271B (en) * | 2023-06-28 | 2023-08-29 | 极芯通讯技术(南京)有限公司 | Method for adaptively adjusting physical random access channel detection window and related equipment thereof |
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