CN103108338A - Detection method, device and base station for random access signal - Google Patents
Detection method, device and base station for random access signal Download PDFInfo
- Publication number
- CN103108338A CN103108338A CN2011103603863A CN201110360386A CN103108338A CN 103108338 A CN103108338 A CN 103108338A CN 2011103603863 A CN2011103603863 A CN 2011103603863A CN 201110360386 A CN201110360386 A CN 201110360386A CN 103108338 A CN103108338 A CN 103108338A
- Authority
- CN
- China
- Prior art keywords
- signature sequence
- time domain
- power
- delay spectrum
- window
- 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
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a detection method, a device and a base station for a random access signal. A physical random access channel (PRACH) time-domain signal sent by a terminal is processed, and a receiving signature sequence is extracted. A power time delay spectrum is obtained based on the extracted receiving signature sequence and a non-displacement local signature sequence. Windowing is performed on the generated power time delay spectrum, and a minimum tolerant threshold value is generated based on a minimum signal to noise ratio a system can tolerant and an average value of power of all power points of the power time delay spectrum on a noise threshold so as to judge whether a user accesses to each window of the power time delay spectrum or not, record the position of the window that the user accesses and perform time delay measurement. The detection method, the device and the base station for the random access signal solve the problem that in existing detection methods of random access signals, when multiple users are accessed at the same time, a calculated threshold value is abnormal improved so that detection omission is caused.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of detection method, device and base station of accidental access signal.
Background technology
Long Term Evolution (Long Term Evolution, LTE) be the evolution of 3G communication system, it has developed and has strengthened the aerial access technology of 3G, adopt OFDM (Orthogonal Frequency Division Multiplex, OFDM) and multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) as its major technique.LTE system definition Frequency Division Duplexing (FDD) (Frequency Division Duplexing, FDD) and time division duplex (Time Division Duplexing, TDD) dual mode, in the mobile communication system of TDD mode, receive and send the different time-gap of the same frequency carrier of use as the carrying of channel, its unidirectional resource is discontinuous in time, and time resource distributes on both direction.TDD-LTE can be formulated on the not wield scattered frequency range of FDD-LTE institute of system easily owing to need not paired frequency, has certain spectral flexibility, can effectively improve the availability of frequency spectrum.
in the TDD-LTE communication system, after a terminal is only completed the time synchronized of up channel, just can be scheduled and carry out uplink, in initial synchronization, terminal is passed through at Physical Random Access Channel (Physical Random Access Channel, PRACH) the upper targeting sequencing that sends, the entrained information of this PRACH request is responsible for detecting in the base station, to determine the timing adjustment amount of uplink synchronous, and it is transmitted to terminal, terminal is adjusted up transmitting data constantly according to the timing adjustment amount that issues, thereby realize the time synchronized of up channel, this process is commonly called random access procedure.
The 3rd generation partnership projects (3
rdGeneration Partnership, 3GPP) in the LTE agreement, generating mode and the send mode to PRACH done standard, adopt in LTE and have permanent envelope zero autocorrelative ZC (Zadoff-Chu) sequence as the reference sequences of random access, base station and terminal are according to the system broadcasts parameter configuration of residential quarter, generate 64 signature sequences from the ZC sequence, RACH (Random Access Channel, RACH) at first initiated by terminal, terminal is basic sequence as this transmission of random selection from 64 signature sequences that generated.The selected signature sequence of terminal is random from the optional frequency domain multiplexing position selects one and be mapped on this time/frequency source block, produces targeting sequencing and generate baseband signal to send.The base station need to be detected the targeting sequencing in PRACH, and when targeting sequencing being detected, thinking has the user to access, and carries out the subsequent user access operation.
In prior art, detection to targeting sequencing, usually detect in conjunction with the threshold value relevant to the maximum of time domain correlation peaks, for example application number is 200910158908.4 Chinese patent application " based on detection method and the checkout gear of random access procedure ", discloses following detection method based on random access procedure: the RACH signal and the local root sequence that receive are carried out the time domain relevant treatment to obtain to get a plurality of RACH time domain sequence of correlation values; Judge that in each RACH time domain sequence of correlation values, whether the maximum in the corresponding RACH time domain correlation in each search window is greater than the first detection threshold; When several search windows that have continuous adjacent all have peak value greater than the first detection threshold, judge that whether this peak value is greater than the second detection threshold, when judging this peak value greater than the second threshold value, the timing position that this peak value is corresponding is converted to the timing adjustment amount, so that the uplink synchronous temporal information to be provided.two thresholdings have been used in this invention, and the window that the first thresholding judgement noise uses is shorter, can not accurately reflect the noise size, the size of the second thresholding that uses is relevant with the maximum of time domain correlation peaks, when having the multi-user to access simultaneously, if user's conflict situations occurs, namely use identical cyclic shift prefix code to occur in same detection window more than a user, the overlapping situation of its correlation peak just very likely appears, can cause the improper raising of threshold value, if it is overlapping to occur n user in same detection window, the threshold value meeting improperly improves n and accompanies, like this, use the threshold value after improper raising to adjudicate, will undetected part correlation peak the not high but user that should detect, cause the system access poor-performing.
Summary of the invention
The embodiment of the present invention provides a kind of detection method, device and base station of accidental access signal, and in the detection method that solves existing accidental access signal, when the multi-user accessed simultaneously, the improper raising of the threshold value that calculates caused undetected problem.
The detection method of a kind of accidental access signal that the embodiment of the present invention provides comprises:
The Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, extracted and receive signature sequence;
The local signature sequence of nothing displacement according to the reception signature sequence that extracts and generation in advance obtains corresponding power delay spectrum;
Divide window to described power delay spectrum, and the mean value of power power of each power points under noise gate in the minimum signal to noise ratio that can tolerate according to system and power delay spectrum, minimum tolerance threshold values generated;
Whether take minimum tolerance threshold values as judgement standard, judging respectively in each window of power delay spectrum has the user to access, and record user's access window the position and carry out latency measurement.
The checkout gear of a kind of accidental access signal that the embodiment of the present invention provides comprises:
Receive the signature sequence extraction unit, be used for the Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, extract and receive signature sequence;
The power delay spectrum generation unit is used for the local signature sequence of nothing displacement according to the reception signature sequence that extracts and generation in advance, obtains corresponding power delay spectrum;
Minimum tolerance threshold values generation unit for the minimum signal to noise ratio that can tolerate according to system and the mean value of power delay spectrum power power of each power points under noise gate, generates minimum tolerance threshold values;
User's detecting unit is used for divide window to described power delay spectrum, and take minimum tolerance threshold values as judgement standard, and whether judge respectively in each window of power delay spectrum has the user to access, and records the position of the window that the user accesses and carry out latency measurement.
The base station that the embodiment of the present invention provides comprises the checkout gear of the above-mentioned accidental access signal that the embodiment of the present invention provides.
the detection method of the above-mentioned accidental access signal that the embodiment of the present invention provides, device and base station, the method on the basis of existing technology, the mean value of power power of each power points under noise gate in signal to noise ratio patient according to system and power delay spectrum, generate minimum tolerance threshold values, this minimum is tolerated the threshold value whether threshold values has the user to access as judgement, because this threshold value can be according to the noise dynamic change of current estimation, and use this threshold value when in power delay spectrum, each window performance number detects, the maximum of this threshold value and time domain correlation peaks is irrelevant, avoided a plurality of users to be in the be at war with abnormal rising of when access threshold value of same window, cause the undetected problem of user, improved the detection performance of accidental access signal.
Description of drawings
The flow chart of the detection method of the accidental access signal that Fig. 1 provides for the embodiment of the present invention;
The extraction that Fig. 2 provides for the embodiment of the present invention receives the specific implementation flow chart of signature sequence;
The block diagram of the detection method of the accidental access signal that Fig. 3 provides for the embodiment of the present invention;
The structure chart of the checkout gear of the accidental access signal that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description, the embodiment of detection method, device and the base station of the accidental access signal that the embodiment of the present invention is provided describes.
The detection method of a kind of accidental access signal that the embodiment of the present invention provides as shown in Figure 1, specifically comprises the following steps:
S101, the PRACH time-domain signal that terminal is sent are processed, and extract and receive signature sequence;
S102, according to the reception signature sequence that extracts and generate in advance without the local signature sequence of displacement, obtain corresponding power delay spectrum;
S103, divide window to described power delay spectrum, and the mean value of power power of each power points under noise gate in the minimum signal to noise ratio that can tolerate according to system and power delay spectrum, minimum tolerance threshold values generated;
S104, take minimum tolerance threshold values as judgement standard, whether judge respectively in each window of power delay spectrum has the user to access, and record user's access window the position and carry out latency measurement.
The below is described in detail the specific implementation of above steps.
In above-mentioned steps S101, the Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, is extracted and receive signature sequence, as shown in Figure 2, specifically realize by following step:
S201, the Physical Random Access Channel time-domain signal that terminal is sent are removed its circulation preorder (CyclicPrefix, CP), obtain time domain expansion signature sequence;
After the PRACH time-domain signal was removed the circulation preorder, the time domain of order into KN that obtains counting was expanded signature sequence, and wherein, the N point carries out counting of fast Fourier transform/inverse transformation (FFT/IFFT) for the base station, take the ofdm system of 10M bandwidth as example, and N=1024.
K is transmitting terminal over-sampling coefficient, K=12 for example in the present embodiment, and certainly, K also adopts other numerical value.
Resulting time domain expansion signature sequence has comprised the resource of several quadratures on frequency domain, each resource has comprised several users' signing messages (being target resource).
S202, the time domain expansion signature sequence that step S301 is obtained carry out the operation of time domain frequency shift;
In this step, time domain is expanded the target resource in the resource of a plurality of quadratures in signature sequence, moved the least significant end to positive frequency band.
S203, to carrying out down-sampled operation through the time domain expansion signature sequence after the operation of time domain frequency shift, obtain the time domain signature sequence;
Preferably, in this step S203, down-sampled operation is divided into filtering coupling, anti-aliasing filter and three steps of extraction successively.Wherein:
Carry out the filtering matching operation, be about to through in the time domain expansion signature sequence after the operation of time domain frequency shift, the target resource that is in positive frequency band is displaced to and is in the symmetrical positive and negative frequency band position of central authorities;
During concrete enforcement, the time domain expansion signature sequence that carries out after the time domain frequency shift operates is carried out frequency compensation, the frequency compensation size is half of its shared bandwidth, namely carry out size to negative frequency band and equal half the displacement of its bandwidth, originally the target resource that is in positive frequency band is moved be in positive and negative frequency band, and its frequency spectrum is symmetrical about direct current, like this, after the filtering coupling, half signal of target resource is in negative frequency band, half signal is in positive frequency band.
The operation of execution anti-aliasing filter namely to carrying out anti-aliasing double-side band filtering through the expansion of the time domain after filtering matching operation signature sequence, obtains time domain and repeats signature sequence;
Carry out extraction operation, namely time domain is repeated signature sequence, sample by setting the interval, obtain N point time domain signature sequence.
During concrete enforcement, the value that the value of setting interval K can equal 12, N is 1024.The quantity of its sampling period and sampled point can be adjusted according to the difference of system.
in embodiments of the present invention, for fear of time domain expansion signature sequence is directly sampled, the signal aliasing that extraction causes, affect the problem of final detection performance, time domain expansion signature sequence is being sampled, before extraction obtains the step of time domain signature sequence, need to carry out the operation of time domain frequency shift to it, the filtering matching operation, make the target resource that is in positive frequency band in time domain expansion signature sequence be displaced to position with the symmetrical positive and negative frequency band of central authorities, like this, during to its anti-aliasing filter operation, target resource can be in the central authorities of the passband of anti-aliasing double-side band filter, avoid the anti-aliasing filter operation to bring loss to the useful targeting signal in the target resource information of time domain expansion signature sequence.
S204, the time domain signature sequence is carried out discrete type Fourier (DFT) conversion, obtain frequency domain signature sequence corresponding to time domain signature sequence;
In this step, the time domain signature sequence that N is ordered obtains the frequency domain signature sequence that N is ordered after carrying out DFT conversion that N orders.
S205, extract to receive signature sequence from the frequency domain signature sequence.
From the frequency domain signature sequence, extract the N that is positioned at the frequency band middle body
ZCThe point of individual quantity is as receiving signature sequence.
Further, in step S102 as shown in Figure 1, at first according to receiving signature sequence and without the local signature sequence of displacement, generating the spectrum correlation sequence; Then the frequency dependence sequence that generates is carried out frequency domain zero padding and contrary discrete Fourier transform (DFT) (Discrete Fourier transform, IDFT) operation, obtain N
2The power delay spectrum of individual point.Wherein:
The base station can according to the system broadcasts parameter configuration, generate the local signature sequence of nothing displacement of several root sequences in advance.
In the LTE system, without the local signature sequence of displacement, can be the frequency domain form without the local Zadoff-Chu sequence of displacement of several root sequences, its length is N
ZCIndividual point.
Length is N
ZCWithout the local signature sequence of displacement and receive signature sequence and carry out associative operation, can obtain the frequency dependence sequence, concrete operating process belongs to the category of prior art, does not repeat them here.
In the specific implementation, the IDFT operation can adopt inverse fast fourier transform (Inverse fast Fourier transform, IFFT) to realize, counting of IFFT is N
2, preferably, N
2=2048.
Further, in above-mentioned steps S103, to N
2The power delay spectrum of individual point minute window is processed, and the size of each window for example can equal
Wherein:
N
CSBe the minimum shift intervals between the signature sequence of different shifted version, this parameter can be preset by system.
N
ZCBe counting of aforementioned reception signature sequence.
After dividing the window processing, each window of power delay spectrum is all distinguished corresponding one or several users that use identical shifted version signature sequence.
Further, in above-mentioned steps S103, the process that generates minimum tolerance threshold values is as follows:
At first the performance number of all power points of power delay spectrum averaged, obtain the first average noise power value No
1
Determine noise gate α No
1
The effect of α be for the noise that suppresses certain probability to avoid causing false-alarm, preferably, the span of α is 1～10; When α was enough high, most noises can suppress, but it is suppressed to bring the less user of Partial Power to access signal, causes undetected; When α was too small, most users accessed signal and all can detect, but may introduce the larger noise of probability smaller power, caused false-alarm.Therefore, the value of α should be moderate, and preferably, the span of α is 1～10; In the specific implementation, the concrete value of α can adopt the mode of system emulation to determine;
Then with α No
1As noise gate, the performance number of each power points of performance number in power delay spectrum below described noise gate is averaged, obtain the second average noise power value No
2
At last, use following formula to calculate minimum tolerance threshold values Th:
In following formula, β is that system adapts to the adjustment factor under multipath fading environments; N
ZCFor receiving counting of signature sequence; N
2Be counting of power delay spectrum; SNR is the signal to noise ratio of the tolerable minimum of system; No
2It is the second average noise power value.
Specifically, the SNR that system can tolerate can be according to the difference of system and value is different, and for example according to LTE related protocol regulation, under the condition of 2 antenna receptions, for form format 0, SNR is-14.2dB; For form format 1, SNR is-14.2dB; For form format 2, SNR is-16.4dB; For form format 3, SNR is-16.5dB; For form format4, SNR is-7.2dB;
Under the condition of 4 antenna receptions, for form format 0, SNR is-16.9dB; For form format1, SNR is-16.7dB; For form format 2, SNR is-19.0dB; For form format 3, SNR is-18.8dB; For form format4, SNR is-9.8dB.
The size of this factor of β has determined that minimum tolerance threshold values Th is with respect to the power fading under additive white Gaussian noise (Additive White Gaussion Noise, AWGN) environment in order to adapt to multipath fading environments.Preferably, its span is between 0～1, when specifically implementing, also determines according to system situation emulation.
Further, in above-mentioned steps S104, whether take minimum tolerance threshold values as judgement standard, judging respectively in each window of power delay spectrum has the user to access, its specific implementation process is as follows:
For each window of power delay spectrum, judge the power points that whether exists in this window greater than described minimum tolerance threshold values Th, if exist, thinking has the user to access in this window; Otherwise thinking does not have the user to access in this window.
Fig. 3 is a kind of embodiment of the detection method of the above-mentioned accidental access signal that provides of the embodiment of the present invention, can find out from this block diagram, through past CP, time domain frequency shift, down-sampled, the time domain signature sequence is carried out the DFT operation, the frequency dependence sequence is carried out the IDFT operation, obtain power delay spectrum, divide window to power delay spectrum again, calculate simultaneously minimum tolerance threshold values, the minimum tolerance threshold values that utilization calculates, whether have the user to access to each window adjudicates, to the window that has the user to access, record targeting sequencing number and carry out latency measurement.
The detection method of the above-mentioned accidental access signal that the embodiment of the present invention provides, in the specific implementation, can be carried out by equipment or the entity of the detection of being responsible for carrying out accidental access signal in communication system, such as being carried out by equipment such as base stations, the embodiment of the present invention is not done restriction to concrete equipment and entity.
Based on same inventive concept, the embodiment of the present invention also provides a kind of checkout gear and base station of accidental access signal, because the principle that these devices and equipment are dealt with problems is similar to the detection method of aforementioned accidental access signal, therefore the enforcement of this device and equipment can referring to the enforcement of preceding method, repeat part and repeat no more.
The checkout gear of a kind of accidental access signal that the embodiment of the present invention provides, its structure comprises as shown in Figure 4:
Receive signature sequence extraction unit 401, be used for the Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, extract and receive signature sequence;
Power delay spectrum generation unit 402 is used for the local signature sequence of nothing displacement according to the reception signature sequence that extracts and generation in advance, obtains corresponding power delay spectrum;
Minimum tolerance threshold values generation unit 403 for the minimum signal to noise ratio that can tolerate according to system and the mean value of power delay spectrum power power of each power points under noise gate, generates minimum tolerance threshold values;
User's detecting unit 404 is used for divide window to power delay spectrum, and take minimum tolerance threshold values as judgement standard, and whether judge respectively in each window of power delay spectrum has the user to access, and records the position of the window that the user accesses and carry out latency measurement.
Further, above-mentioned minimum tolerance threshold values generation unit 403, concrete being used for averages the performance number of all power points of power delay spectrum, obtains the first average noise power value No
1Determine noise gate α No
1The span of α is 1～10; With α No
1As noise gate, the performance number of each power points of performance number in power delay spectrum below described noise gate is averaged, obtain the second average noise power value No
2And calculate minimum tolerance threshold values Th, wherein,
β is that system adapts to the adjustment factor under multipath fading environments; N
ZCBe counting of described reception signature sequence; N
2For the power of described power delay spectrum is counted; SNR is the signal to noise ratio of the tolerable minimum of system; No
2It is the second average noise power value.
Further, above-mentioned reception signature sequence extraction unit 401, concrete being used for removed its circulation preorder to the Physical Random Access Channel time-domain signal that terminal sends, and obtains time domain expansion signature sequence; Described time domain expansion signature sequence is carried out the operation of time domain frequency shift; To carrying out down-sampled operation through the time domain expansion signature sequence after the operation of time domain frequency shift, obtain the time domain signature sequence; Described time domain signature sequence is carried out discrete type Fourier DFT conversion, obtain frequency domain signature sequence corresponding to time domain signature sequence; Extract from described frequency domain signature sequence and receive signature sequence.
On above-mentioned basis, further, receive signature sequence extraction unit 401, concrete being used for moved the least significant end to positive frequency band with the target resource in the resource of a plurality of quadratures of described time domain expansion signature sequence.
On above-mentioned basis, further, receive signature sequence extraction unit 401, concrete for carrying out the filtering matching operation, will be through in the time domain expansion signature sequence after the operation of time domain frequency shift, the target resource that is in positive frequency band is displaced to and is in the symmetrical positive and negative frequency band position of central authorities; Execution anti-aliasing filter operation is carried out anti-aliasing double-side band filtering to the time domain expansion signature sequence that carries out after the filtering matching operation, obtains time domain and repeats signature sequence; Then carry out extraction operation, time domain is repeated signature sequence, sample by setting the interval, obtain the time domain signature sequence.
On above-mentioned basis, further, receive signature sequence extraction unit 401, concrete being used for from the frequency domain signature sequence, extract the N that is positioned at the frequency band middle body
ZCThe point of quantity is as receiving signature sequence.
Further, above-mentioned power delay spectrum generation unit 402, concrete being used for generates the spectrum correlation sequence according to described reception signature sequence and described without the local signature sequence of displacement; Described frequency dependence sequence is carried out frequency domain zero padding and contrary discrete Fourier transform (DFT) IDFT operation, obtain power delay spectrum.
Further, above-mentioned user's detecting unit 404, concrete each window that is used for for power delay spectrum judges the power points that whether exists in this window greater than described minimum tolerance threshold values Th, if exist, thinking has the user to access in this window; Otherwise thinking does not have the user to access in this window.
The embodiment of the present invention also provides a kind of base station, and this base station comprises the checkout gear of the above-mentioned accidental access signal that the embodiment of the present invention provides.
the detection method of the above-mentioned accidental access signal that the embodiment of the present invention provides, device and base station, the method on the basis of existing technology, the mean value of power power of each power points under noise gate in signal to noise ratio patient according to system and power delay spectrum, generate minimum tolerance threshold values, this minimum is tolerated the threshold value whether threshold values has the user to access as judgement, because this threshold value can be according to the noise dynamic change of current estimation, and use this threshold value when in power delay spectrum, each window performance number detects, the maximum of this threshold value and time domain correlation peaks is irrelevant, avoided a plurality of users to be in the be at war with abnormal rising of when access threshold value of same window, cause the undetected problem of user, improved the detection performance of accidental access signal.
further, the detection method of the above-mentioned accidental access signal that the embodiment of the present invention provides, device and base station, time domain expansion signature sequence is being sampled, before extraction obtains the step of time domain signature sequence, need to carry out the operation of time domain frequency shift to it, the filtering matching operation, make the target resource that is in positive frequency band in time domain expansion signature sequence be displaced to position with the symmetrical positive and negative frequency band of central authorities, like this, during to its anti-aliasing filter operation, target resource can be in the central authorities of the passband of anti-aliasing double-side band filter, avoid the anti-aliasing filter operation to bring loss to the useful targeting signal in the target resource information of time domain expansion signature sequence, avoided time domain expansion signature sequence is directly sampled, the signal aliasing that extraction causes, affect the problem of final detection performance.
Obviously, those skilled in the art can carry out various changes and modification and not break away 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 claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. the detection method of an accidental access signal, is characterized in that, comprising:
The Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, extracted and receive signature sequence;
The local signature sequence of nothing displacement according to the reception signature sequence that extracts and generation in advance obtains corresponding power delay spectrum;
Divide window to described power delay spectrum, and the mean value of power power of each power points under noise gate in the minimum signal to noise ratio that can tolerate according to system and power delay spectrum, minimum tolerance threshold values generated;
Whether take minimum tolerance threshold values as judgement standard, judging respectively in each window of power delay spectrum has the user to access, and record user's access window the position and carry out latency measurement.
2. the method for claim 1, is characterized in that, generates minimum tolerance threshold values, specifically comprises:
Performance number to all power points of power delay spectrum averages, and obtains the first average noise power value No
1
Determine noise gate α No
1The span of α is 1～10;
With α No
1As noise gate, the performance number of each power points of performance number in power delay spectrum below described noise gate is averaged, obtain the second average noise power value No
2
Calculate minimum tolerance threshold values Th, wherein,
β is that system adapts to the adjustment factor under multipath fading environments; N
ZCBe counting of described reception signature sequence; N
2For the power of described power delay spectrum is counted; SNR is the signal to noise ratio of the tolerable minimum of system; No
2It is the second average noise power value.
3. method as claimed in claim 1 or 2, is characterized in that, the Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, and extracts and receive signature sequence, specifically comprises:
The PRACH time-domain signal that terminal sends is removed its circulation preorder, obtain time domain expansion signature sequence;
Described time domain expansion signature sequence is carried out the operation of time domain frequency shift;
To carrying out down-sampled operation through the time domain expansion signature sequence after the operation of time domain frequency shift, obtain the time domain signature sequence;
Described time domain signature sequence is carried out discrete type Fourier DFT conversion, obtain frequency domain signature sequence corresponding to time domain signature sequence;
Extract from described frequency domain signature sequence and receive signature sequence.
4. method as claimed in claim 3, is characterized in that, described time domain expansion signature sequence is carried out the operation of time domain frequency shift, comprising:
With the target resource in the resource of a plurality of quadratures in described time domain expansion signature sequence, move the least significant end to positive frequency band.
5. method as claimed in claim 3, is characterized in that, to carrying out down-sampled operation through the time domain expansion signature sequence after the operation of time domain frequency shift, obtains the time domain signature sequence, comprising:
Carry out the filtering matching operation, will be through in the time domain expansion signature sequence after the operation of time domain frequency shift, the target resource that is in positive frequency band is displaced to and is in the symmetrical positive and negative frequency band position of central authorities;
Execution anti-aliasing filter operation is carried out anti-aliasing double-side band filtering to the time domain expansion signature sequence that carries out after the filtering matching operation, obtains time domain and repeats signature sequence;
Carry out extraction operation, time domain is repeated signature sequence, sample by setting the interval, obtain the time domain signature sequence.
6. method as claimed in claim 3, is characterized in that, extracts from described frequency domain signature sequence and receive signature sequence, specifically comprises:
From the frequency domain signature sequence, extract the N that is positioned at the frequency band middle body
ZCThe point of quantity is as receiving signature sequence.
7. method as claimed in claim 1 or 2, is characterized in that, the local signature sequence of nothing displacement according to the reception signature sequence that extracts and generation in advance obtains corresponding power delay spectrum, comprising:
According to described reception signature sequence and described without the local signature sequence of displacement, generate the spectrum correlation sequence;
Described frequency dependence sequence is carried out frequency domain zero padding and contrary discrete Fourier transform (DFT) IDFT operation, obtain power delay spectrum.
8. method as claimed in claim 1 or 2, is characterized in that, and is described take minimum tolerance threshold values Th as standard, judges that whether each window has the user to access, and comprising:
For each window of power delay spectrum, judge the power points that whether exists in this window greater than described minimum tolerance threshold values Th, if exist, thinking has the user to access in this window; Otherwise thinking does not have the user to access in this window.
9. the checkout gear of an accidental access signal, is characterized in that, comprising:
Receive the signature sequence extraction unit, be used for the Physical Random Access Channel PRACH time-domain signal that terminal sends is processed, extract and receive signature sequence;
The power delay spectrum generation unit is used for the local signature sequence of nothing displacement according to the reception signature sequence that extracts and generation in advance, obtains corresponding power delay spectrum;
Minimum tolerance threshold values generation unit for the minimum signal to noise ratio that can tolerate according to system and the mean value of power delay spectrum power power of each power points under noise gate, generates minimum tolerance threshold values;
User's detecting unit is used for divide window to described power delay spectrum, and take minimum tolerance threshold values as judgement standard, and whether judge respectively in each window of power delay spectrum has the user to access, and records the position of the window that the user accesses and carry out latency measurement.
10. device as claimed in claim 9, is characterized in that, described minimum tolerance threshold values generation unit, and concrete being used for averages the performance number of all power points of power delay spectrum, obtains the first average noise power value No
1Determine noise gate α No
1The span of α is 1～10; With α No
1As noise gate, the performance number of each power points of performance number in power delay spectrum below described noise gate is averaged, obtain the second average noise power value No
2And calculate minimum tolerance threshold values Th, wherein,
β is that system adapts to the adjustment factor under multipath fading environments; N
ZCBe counting of described reception signature sequence; N
2For the power of described power delay spectrum is counted; SNR is the signal to noise ratio of the tolerable minimum of system; No
2It is the second average noise power value.
11. device as described in claim 9 or 10 is characterized in that, described reception signature sequence extraction unit, and concrete being used for removed its circulation preorder to the Physical Random Access Channel time-domain signal that terminal sends, and obtains time domain expansion signature sequence; Described time domain expansion signature sequence is carried out the operation of time domain frequency shift; To carrying out down-sampled operation through the time domain expansion signature sequence after the operation of time domain frequency shift, obtain the time domain signature sequence; Described time domain signature sequence is carried out discrete type Fourier DFT conversion, obtain frequency domain signature sequence corresponding to time domain signature sequence; Extract from described frequency domain signature sequence and receive signature sequence.
12. device as claimed in claim 11 is characterized in that, described reception signature sequence extraction unit, and concrete being used for moved the least significant end to positive frequency band with the target resource in the resource of a plurality of quadratures of described time domain expansion signature sequence.
13. device as claimed in claim 11, it is characterized in that, described reception signature sequence extraction unit, concrete for carrying out the filtering matching operation, will be through in the time domain expansion signature sequence after the operation of time domain frequency shift, the target resource that is in positive frequency band is displaced to and is in the symmetrical positive and negative frequency band position of central authorities; Execution anti-aliasing filter operation is carried out anti-aliasing double-side band filtering to the time domain expansion signature sequence that carries out after the filtering matching operation, obtains time domain and repeats signature sequence; Then carry out extraction operation, time domain is repeated signature sequence, sample by setting the interval, obtain the time domain signature sequence.
14. device as claimed in claim 11 is characterized in that, described reception signature sequence extraction unit, extracts the N that is positioned at the frequency band middle body at concrete being used for from the frequency domain signature sequence
ZCThe point of quantity is as receiving signature sequence.
15. device as described in claim 9 or 10 is characterized in that, described power delay spectrum generation unit, and concrete being used for generates the spectrum correlation sequence according to described reception signature sequence and described without the local signature sequence of displacement; Described frequency dependence sequence is carried out frequency domain zero padding and contrary discrete Fourier transform (DFT) IDFT operation, obtain power delay spectrum.
16. device as described in claim 9 or 10 is characterized in that, described user's detecting unit, concrete each window that is used for for power delay spectrum, judge the power points that whether exists in this window greater than described minimum tolerance threshold values Th, if exist, thinking has the user to access in this window; Otherwise thinking does not have the user to access in this window.
17. a base station is characterized in that described base station comprises the checkout gear as the described accidental access signal of claim 9-16 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110360386.3A CN103108338B (en) | 2011-11-14 | 2011-11-14 | Detection method, device and base station for random access signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110360386.3A CN103108338B (en) | 2011-11-14 | 2011-11-14 | Detection method, device and base station for random access signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103108338A true CN103108338A (en) | 2013-05-15 |
| CN103108338B CN103108338B (en) | 2015-06-17 |
Family
ID=48315837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110360386.3A Expired - Fee Related CN103108338B (en) | 2011-11-14 | 2011-11-14 | Detection method, device and base station for random access signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103108338B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579560A (en) * | 2014-12-16 | 2015-04-29 | 华为技术有限公司 | SNR computing method and device |
| CN106060864A (en) * | 2016-05-23 | 2016-10-26 | 南京邮电大学 | Threshold adaptive physical random access channel detection method |
| CN106559859A (en) * | 2015-09-30 | 2017-04-05 | 华为技术有限公司 | A kind of terminal access method and device |
| CN109923895A (en) * | 2016-10-28 | 2019-06-21 | 瑞典爱立信有限公司 | Network node and the method for establishing neighbor node relationship within network nodes |
| WO2019127396A1 (en) * | 2017-12-29 | 2019-07-04 | Nokia Shanghai Bell Co., Ltd. | Method and device for nprach detection |
| CN110933703A (en) * | 2019-12-27 | 2020-03-27 | 京信通信系统（中国）有限公司 | User detection method, device, equipment and storage medium |
| CN115047501A (en) * | 2022-08-15 | 2022-09-13 | 长沙学院 | Satellite navigation authorization signal estimation method suitable for BOC modulation |
| WO2023246079A1 (en) * | 2022-06-22 | 2023-12-28 | 中兴通讯股份有限公司 | Prach peak detection method, base station, communication system, and medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1811691A2 (en) * | 2006-01-20 | 2007-07-25 | LG - Nortel Co., Ltd. | Apparatus and method for transmitting and receiving a RACH signal in SC-FDMA system |
| CN101098186A (en) * | 2006-06-27 | 2008-01-02 | 中兴通讯股份有限公司 | Method for accessing randomly front detection dynamic threshold |
| CN101295999A (en) * | 2008-06-27 | 2008-10-29 | 中兴通讯股份有限公司 | Detection method for accidental precursor access |
-
2011
- 2011-11-14 CN CN201110360386.3A patent/CN103108338B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1811691A2 (en) * | 2006-01-20 | 2007-07-25 | LG - Nortel Co., Ltd. | Apparatus and method for transmitting and receiving a RACH signal in SC-FDMA system |
| CN101098186A (en) * | 2006-06-27 | 2008-01-02 | 中兴通讯股份有限公司 | Method for accessing randomly front detection dynamic threshold |
| CN101295999A (en) * | 2008-06-27 | 2008-10-29 | 中兴通讯股份有限公司 | Detection method for accidental precursor access |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579560B (en) * | 2014-12-16 | 2019-02-05 | 华为技术有限公司 | A kind of SNR calculation method and device |
| CN104579560A (en) * | 2014-12-16 | 2015-04-29 | 华为技术有限公司 | SNR computing method and device |
| CN106559859B (en) * | 2015-09-30 | 2021-01-29 | 华为技术有限公司 | Terminal access method and device |
| WO2017054641A1 (en) * | 2015-09-30 | 2017-04-06 | 华为技术有限公司 | Terminal access method and apparatus |
| CN106559859A (en) * | 2015-09-30 | 2017-04-05 | 华为技术有限公司 | A kind of terminal access method and device |
| US10716140B2 (en) | 2015-09-30 | 2020-07-14 | Huawei Technologies Co., Ltd. | Terminal access method, and apparatus |
| CN106060864A (en) * | 2016-05-23 | 2016-10-26 | 南京邮电大学 | Threshold adaptive physical random access channel detection method |
| CN109923895A (en) * | 2016-10-28 | 2019-06-21 | 瑞典爱立信有限公司 | Network node and the method for establishing neighbor node relationship within network nodes |
| WO2019127396A1 (en) * | 2017-12-29 | 2019-07-04 | Nokia Shanghai Bell Co., Ltd. | Method and device for nprach detection |
| US11265923B2 (en) | 2017-12-29 | 2022-03-01 | Nokia Technologies Oy | Method and device for NPRACH detection |
| CN110933703A (en) * | 2019-12-27 | 2020-03-27 | 京信通信系统（中国）有限公司 | User detection method, device, equipment and storage medium |
| WO2023246079A1 (en) * | 2022-06-22 | 2023-12-28 | 中兴通讯股份有限公司 | Prach peak detection method, base station, communication system, and medium |
| CN115047501A (en) * | 2022-08-15 | 2022-09-13 | 长沙学院 | Satellite navigation authorization signal estimation method suitable for BOC modulation |
| CN115047501B (en) * | 2022-08-15 | 2022-11-08 | 长沙学院 | Satellite navigation authorization signal estimation method suitable for BOC modulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103108338B (en) | 2015-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103108338B (en) | Detection method, device and base station for random access signal | |
| US20190239249A1 (en) | Processing of random access preamble sequences | |
| KR102223556B1 (en) | Simple rach (srach) | |
| CN101295999B (en) | Detection method for accidental precursor access | |
| CN101944929B (en) | Detection method and device based on random access process | |
| RU2479929C2 (en) | Radio communication base station device and correlation setting method | |
| CN101326739B (en) | Synchronization method and system for mobile communication | |
| US20120099631A1 (en) | Pilot-based time offset estimation apparatus and method | |
| CN102209052B (en) | Method and device for carrying out frequency offset compensation on random access signals | |
| de Figueiredo et al. | Multi-stage based cross-correlation peak detection for LTE random access preambles | |
| CN103532903A (en) | Frame synchronization scheme of 60 GHz OFDM (orthogonal frequency division multiplexing) wireless communication system | |
| CN103108337B (en) | Detection method, device and base station for random access signal | |
| CN101820407B (en) | Serial interference cancellation based frequency domain initial ranging method and system | |
| CN102238123A (en) | Ranging code detection method and device | |
| CN104507110A (en) | Precise detection method of PRACHs (physical random access channels) for LTE-FDD (long-term evolution-frequency division duplex) | |
| CN102316067B (en) | Synchronization method in communication system and system | |
| US9866368B1 (en) | Method and apparatus for time tracking in OFDM wireless communication systems | |
| KR101421305B1 (en) | ractional frequency offset estimation method and receiver using the same | |
| US10051490B2 (en) | Determination apparatus for determining communication availability and determination method | |
| CN114342446A (en) | Sequence repetition for non-synchronous uplink transmission | |
| Puneeth et al. | A prach preamble generation and detection model for 5gnr systems | |
| CN102325116B (en) | Synchronization method and system in communication system | |
| CN103249171B (en) | OFDMA system accidental access method | |
| JP5695399B2 (en) | Communication apparatus and wireless communication method | |
| CN108055222A (en) | Data processing method and intelligent terminal based on ofdm system |
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 | ||
| ASS | Succession or assignment of patent right |
Owner name: JINGXIN COMMUNICATION SYSTEM CO LTD (GUANGZHOU) Free format text: FORMER OWNER: COMBA TELECOM SYSTEMS (CHINA) CO., LTD. Effective date: 20150826 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150826 Address after: 510663 Guangdong city of Guangzhou province Guangzhou economic and Technological Development Zone Jinbi Road No. 6 Patentee after: COMBA TELECOM SYSTEMS (GUANGZHOU) Ltd. Address before: 510663 Guangzhou Science City, Guangdong Shenzhou Road, No. 10 Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160407 Address after: Nansha District Fengze road Guangzhou city Guangdong province 510000 No. 106 (self building No. 1) X1301-F322 (only for office use) (JM) Patentee after: GUANGZHOU ZHONGDING MULIN NETWORK TECHNOLOGY CO.,LTD. Address before: 510663 Guangdong city of Guangzhou province Guangzhou economic and Technological Development Zone Jinbi Road No. 6 Patentee before: COMBA TELECOM SYSTEMS (GUANGZHOU) Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20211114 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |