WO2011120255A1

WO2011120255A1 - Method and apparatus for compensating frequency offset of random access signals

Info

Publication number: WO2011120255A1
Application number: PCT/CN2010/073610
Authority: WO
Inventors: 王雯芳; 刘�东; 刘巧艳
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-03-31
Filing date: 2010-06-07
Publication date: 2011-10-06
Also published as: CN102209052A; CN102209052B

Abstract

A method and an apparatus for compensating frequency offset of random access signals are disclosed in the present invention. The method includes: receiving the random access signals, then acquiring a peak value detection sequence (301); compensating the frequency offset for the cyclic shift sequence according to the relationship between a main peak value and a subsidiary peak value of a cyclic shift sequence in the peak value detection sequence (302); detecting the peak value in the compensated cyclic shift sequence (303). The present invention can eliminate the deterioration of missed detection performance and false alarm performance caused by the frequency offset while detecting the random access signals, increase the accuracy of the detection, and save resources.

Description

Frequency offset compensation method and device for random access signal

Technical field

The present invention relates to the field of mobile communication technologies, and in particular, to a frequency offset compensation method and apparatus for a random access signal.

Background technique

In the Long Term Evolution (LTE) system, after the mobile terminal is powered on, the downlink synchronization is first performed through the synchronization channel (SCH), and the radio frame, the reception start point of the subframe, and the cell ID (Cell ID) are found; The broadcast channel (BCH) acquires system information, and the system information includes configuration information of a random access channel (RACH). Finally, uplink synchronization is performed through the RACH channel to complete the work of the access system.

In the process of uplink synchronization of the mobile terminal, first, the location of the RACH channel is found based on the radio frame and the reception start point of the subframe determined in the following line synchronization, and the starting point of the transmission preamble is determined, and then a sequence is randomly selected from the available sequences. Send as a preamble. The base station detects the preamble to determine the timing adjustment amount of the uplink synchronization, and sends the timing adjustment amount to the mobile terminal, and the mobile terminal adjusts the transmission timing of the uplink signal according to the timing adjustment amount to implement time synchronization of the uplink channel.

The uplink random access preamble in the existing LTE system is generated by one or more ZC (Zadoff-Chu) root sequences. The first two sequences are defined as = ^{; N} - , 0 ≤ ^{n ≤ N} _zc - \ . Among them, the long W _{zc of the} ZC sequence is 839 in the format 0-3 mode and 139 in the format 4 mode. Each cell (Cell) has 64 sequences for generating preambles, which may be different cyclic shifts from the same root sequence, or different cyclic shifts from different root sequences. The ZC sequence is a Constant Amplitude Zero Auto-correlation Code (CAZAC) sequence, and its correlation has the following characteristics: The correlation between different cyclic sequences of the same root sequence is 0; different root sequences (including Cyclic shift sequence of each other)

That is, the correlation between different root sequences of RACH is very small and can be considered to be approximately equal to zero. Therefore, you can use the RACH sequence The whole amount.

The existing RACH detection method does not consider the influence of frequency offset. As shown in Fig. 1, P is the main peak when there is no frequency offset; P0 is the main peak with frequency offset, the frequency offset is 500Hz, and other values are the replica peaks with frequency offset. It can be seen that the main peak will decrease when there is a bias frequency, which may cause the deterioration of the leak detection performance, and a replica peak appears around the main peak, which may cause deterioration of the false alarm performance. Some existing methods first perform frequency offset estimation in the frequency domain, and then perform frequency offset compensation in the time domain to prevent deterioration of the missed detection performance. 4 Set the estimated normalized frequency offset (normalized frequency offset refers to the estimated frequency offset and subcarrier spacing ratio) knot exp(-j2^«/N). Where N is the length of each symbol in the time domain, n is the index of each symbol, w = o, l, . , N - 1. However, this method is suitable for single-user situations, and multi-users are considered in RACH, so these methods are not applicable. In addition, in the case of multiple users, if the Discrete Fourier Transform (DFT) is applied to the frequency domain, the frequency offset is estimated in the frequency domain, and the original time domain data is subjected to frequency offset compensation, and then DFT is performed in the frequency domain. Sequence detection, as shown in Figure 2, because the frequency offset of each user may be different, multiple users need multiple frequency offset compensation and DFT operation, which consumes a large amount of resources and is computationally intensive, which is difficult to implement and apply.

Therefore, the prior art has at least the following disadvantages: The existing detection method of the random access signal does not consider the influence of the frequency offset, and the frequency offset may cause the deterioration of the missed detection performance and the false alarm performance, and the existing frequency offset compensation The method is not applicable to RACH, and it occupies a large amount of resources, and the amount of calculation is also very large, which is difficult to implement and apply.

Summary of the invention

Embodiments of the present invention provide a frequency offset compensation method and apparatus for a random access signal, which are used to eliminate the deterioration of the missed detection performance and the false alarm performance caused by the frequency offset.

An embodiment of the present invention provides a frequency offset compensation method for a random access signal, where the method includes: receiving a random access signal to obtain a peak detection sequence;

Performing frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence;

Peak detection is performed on the cyclic shift sequence after the frequency offset compensation. Obtaining peak detection sequence The steps of the column include:

Multiplying the frequency domain value of the received random access signal with the frequency domain value of the local root sequence or the local cyclic shift sequence, and then transforming the random access signal into the time domain by inverse fast Fourier transform processing The square of the modulus is obtained to obtain a peak detection sequence.

When the random access signal is a random access channel signal in a repeated format, the peak detection sequence is a peak detection sequence 歹 | J after repeatedly combining the random access channel signals in the repeated format;

When the random access signal is a multi-antenna received signal, the peak value detection sequence is a peak value detection sequence after performing data combining processing on the multi-antenna received signal.

The step of performing frequency offset compensation on the cyclic shift sequence according to the relationship between the main peak and the replica peak of the cyclic shift sequence in the peak detection sequence includes: finding a main peak and a replica peak of the cyclic shift sequence And, and replace the original main peak with the sum value to achieve frequency offset compensation;

The main peak is a peak in a search window corresponding to the cyclic shift sequence;

The replica peak is a peak at an integer multiple of the unit distance from the main peak of the cyclic shift sequence.

The step of performing frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence includes: cyclically shifting when the replica peak satisfies a validity condition The sum of the main peak of the sequence and the peak of the replica replaces the original main peak; when the peak of the replica does not satisfy the validity condition, the main peak does not change. The above method further comprises: when the detection is successful and the replica peak satisfies the validity condition, eliminating a replica peak of the cyclic shift sequence in the peak detection sequence.

An embodiment of the present invention provides a frequency offset compensation apparatus for a random access signal, where the apparatus includes: an acquisition module, configured to: receive a random access signal to obtain a peak detection sequence; and a frequency offset compensation module, configured to: Generating a relationship between a main peak of a cyclic shift sequence and a replica peak in a peak detection sequence, and performing frequency offset compensation on the cyclic shift sequence;

And a detecting module, configured to: perform peak detection on the cyclic shift sequence after the frequency offset compensation. The acquisition module is configured to acquire a peak detection sequence in the following manner: The frequency domain value of the access signal is multiplied by the frequency domain value of the local root sequence or the local cyclic shift sequence, and the random access signal is transformed into the time domain by the inverse fast Fourier transform process to obtain a peak value. Detection sequence.

The frequency offset compensation module includes:

a peak acquisition submodule, configured to: obtain a primary peak and a replica peak of the cyclic shift sequence;

The calculation sub-module is configured to: sum the main peak obtained by the peak acquisition sub-module and the replica peak value, and replace the original main peak with the sum value to implement frequency offset compensation.

The above device also includes:

a judging module, configured to: determine whether a replica peak satisfies a validity condition, and notify the frequency offset compensation module of the judgment result;

And deleting a module, configured to: when the determining module determines that the peak value of the replica satisfies a validity condition, canceling a replica peak of the cyclic shift sequence in the peak detection sequence.

A frequency offset compensation method and apparatus for a random access signal according to an embodiment of the present invention is configured to receive a random access signal to obtain a peak detection sequence; and according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence, Frequency offset compensation is performed on the cyclic shift sequence; peak detection is performed on the cyclic shift sequence after the frequency offset compensation. The method and device provided by the embodiments of the present invention can eliminate the deterioration of the missed detection performance and the false alarm performance caused by the frequency offset of the random access signal detection, improve the accuracy of detection, and save resources. BRIEF abstract

1 is a schematic diagram of peaks of frequency offset in the prior art;

2 is a schematic diagram of a frequency offset estimation process in the prior art;

3 is a schematic flowchart of a frequency offset compensation method for a random access signal according to an embodiment of the present invention; FIG. 4 is a schematic flowchart of a frequency offset compensation method for a random access signal according to an embodiment of the present invention; FIG. FIG. 6 is a schematic flowchart of a frequency offset compensation method for a random access signal according to an embodiment of the present invention; FIG. FIG. 7 is a schematic flowchart of a frequency offset compensation method for a random access signal according to an embodiment of the present invention; FIG. 8 is a schematic structural diagram of a frequency offset compensation apparatus for a random access signal according to an embodiment of the present invention; FIG. 9 is a random connection according to an embodiment of the present invention; Schematic diagram of the frequency offset compensation system of the incoming signal. Preferred embodiment of the invention

The main implementation principles, specific implementation manners, and the corresponding beneficial effects that can be achieved by the technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, a frequency offset compensation method for a random access signal according to an embodiment of the present invention includes the following steps:

Step 301: Receive a random access signal, and obtain a peak detection sequence.

The peak detection sequence may be a peak detection sequence of a local root sequence or a peak detection sequence of a cyclic shift sequence. However, when a peak detection sequence of a cyclic shift sequence is used, the amount of computation is large under multi-user conditions, so A peak detection sequence of the local root sequence is preferred. The peak detection sequence may be formed by: multiplying the received random access signal with a frequency domain value of a local root sequence or a cyclic shift sequence, and then performing an inverse fast Fourier transform (IFFT) The process transforms the RACH signal from the frequency domain to the time domain and then squares the modulus. Of course, other methods can be used to obtain the peak detection sequence, which is not listed here.

When the random access signal is a random access channel signal in a repeated format, the peak detection sequence is a peak detection sequence after performing repeated combining processing on the random access channel signal in the repeated format; the random access signal is multi-antenna reception In the case of a signal, the peak detection sequence is a peak detection sequence after data combining processing of the multi-antenna received signal.

Step 302: Perform frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence.

The peak detection sequence may include a search window of a plurality of cyclic shift sequences. The main peak of the cyclic shift sequence refers to the peak within the search window corresponding to the cyclic shift sequence. The replica peak of the cyclic shift sequence refers to the peak at an integer multiple of the distance from the main peak. Among them, ^ and? It is the modular inverse of the sequence length N _ze , that is, N _{ze is} represented by ^ and ? in the search window to form a graph. Preferably, the peak of the copy here only takes the larger of the peaks of the two copies adjacent to the left and right of the main peak, that is, the distance from the left and right of the main peak. The larger of the two peaks.

Wherein, when the frequency offset compensation is performed according to the main peak and the replica peak, the main peak and the replica peak are summed, and the original value is replaced by the sum value, thereby realizing the frequency offset compensation. Of course, it is also possible to adjust the main peak according to the proportional relationship between the main peak and the replica peak or other algorithms to adjust the main peak. Since the addition is simple, only the addition is taken as an example here, and the other methods are not enumerated.

Preferably, the validity of the replica peak can be judged. When the peak value of the replica satisfies a certain preset condition, the peak of the replica is determined to be valid, and the peak of the replica is summed with the peak of the replica and replaced with the original peak. Otherwise, the peak of the replica is invalid. , do not do the summation operation, the original main peak does not change.

When the copy peak validity judgment is made, the copy peak value can be compared with the predetermined threshold. When the copy peak value is greater than the predetermined threshold, it is determined that the copy peak value is valid, otherwise it is determined that the copy peak value is invalid. Here, the threshold can be obtained based on the noise estimate or can be set based on the empirical value.

Step 303: Perform peak detection on the cyclic shift sequence after the frequency offset compensation. A noise mean estimate is performed for each root sequence, and the threshold is detected based on the estimated noise, and then the signal in the search window is detected, and the signal exceeding the detection threshold is filtered.

In order to reduce the interference of the current cyclic shift sequence on other cyclic shift sequences generated by the same root sequence, after the detection is successful, if the copy peak validity judgment is performed before, and the judgment result is that the replica peak is valid, the peak detection sequence is eliminated. The cyclic shift sequence is a copy of the peak, otherwise no action is taken. When there is a sample in the peak detection process, in order to eliminate the influence of the sample, the copy peak of the cyclic shift sequence in the peak detection sequence and the values of several samples in the vicinity thereof can be eliminated.

If there are multiple cyclic shift sequences under the current root sequence, repeat the above steps until all cyclic shift sequences in the current root sequence have been processed. If the current cell has multiple root sequences, repeat all of the above steps until all root sequences have been processed.

From the above description, it can be seen that the method provided by the embodiment of the present invention can overcome the shortcoming that the existing time domain frequency offset estimation algorithm is not applicable to multiple users, and the calculation amount is too large, thereby realizing the elimination of the random access signal detection time frequency. Deterioration of missed detection performance and false alarm performance, improving detection accuracy and saving resources.

A more specific embodiment is given below. As shown in FIG. 4, the method provided by the embodiment of the present invention is described, including the following steps: Step 401: Receive a random access signal, and obtain a peak detection sequence of the root sequence. The peak detection sequence may be: the received random access signal and the local root sequence or the cyclic shift sequence. The frequency domain value is conjugated by a point multiplication, and then subjected to an inverse fast Fourier transform (IFFT) process to transform the RACH signal from the frequency domain to the time domain, and then to square the modulus. The random access signal includes, but is not limited to, a multi-antenna received signal and a random access channel signal in a repeated format.

Step 402: Find a main peak and a replica peak of the current cyclic shift sequence in the search window; a peak at an integer multiple of the distance from the main peak is all the replica peaks, and only one replica peak closest to the main peak and having the largest value is processed. Peak.

Step 403: summing the main peak and the replica peak, and replacing the original main peak with the sum value; assuming a carrier offset of 0.4 times, as shown in FIG. 5, the normalized main peak is changed from 1 to 0.57. The peak value of the copy is about 0.26. If the main peak value is 0.57, it may reduce the missed detection performance. The value obtained by summing the main peak and the sub-peak value by about 0.83 instead of the original main peak can greatly improve the missed detection. performance.

Step 404: Perform detection on a current cyclic shift sequence peak; the specific method may refer to an existing algorithm, for example: performing a noise mean estimation on each root sequence, and detecting a threshold according to the estimated noise, and then The signals in the search window are detected and the signals that meet the detection threshold are filtered.

If the current root sequence includes a plurality of cyclic shift sequences, steps 402 through 404 are repeated until all of the cyclic shift sequences in the current root sequence are processed. If the current cell has multiple root sequences 歹J, repeat all the above steps until all root sequences have been processed.

On the basis of the foregoing embodiment, the validity of the replica peak can also be detected. When the replica peak has no validity, it may be noise. In this case, the original main peak can be used. As shown in FIG. 6, the following steps are specifically included:

Step 601, which is the same as step 401;

Step 602: The same as step 402;

Step 603: Perform validity detection on the peak of the replica; use the threshold to perform validity detection, specifically, determine whether the peak value of the replica is greater than a threshold, and if greater than the threshold, determine a valid replica peak The value, that is, the peak value of the replica caused by the frequency offset, continues to step 604; otherwise, it is determined that the replica peak is invalid, that is, it may be noise, and step 605 is performed.

The threshold can be obtained based on the estimated average noise power. If the estimated noise average power is N„^, the threshold can be set to 73⁄41 = / (U, simply, JM = 2* N„^ can be set.

Step 604: summing the main peak and the peak of the replica, and replacing the original main peak with the sum value. Compared with the above embodiment, since the replica peak validity detection is performed, the probability that the noise is mistaken for the peak of the replica when there is no frequency offset or the frequency offset is reduced, so that the influence of noise is reduced to some extent, and the false alarm is improved. performance.

Step 605: Detect a peak of a current cyclic shift sequence.

If the current root sequence includes a plurality of cyclic shift sequences, the above steps 602 to 605 are repeated until all of the cyclic shift sequences in the current root sequence are processed. If the current cell has multiple root sequences, repeat all the above steps until all root sequences have been processed.

On the basis of the foregoing embodiment, after the peak detection is successful, if the peak value of the replica is determined to be valid, the corresponding replica peak in the peak detection sequence is eliminated. As shown in FIG. 7, the following steps are specifically included:

Step 701 to step 705 are the same as steps 601 to 605 of the second embodiment.

Step 706: Determine whether the peak detection is successful. If successful, perform step 707; otherwise, continue with other corresponding processing.

Step 707: When the peak of the replica is valid, that is, the peak of the replica is caused by the frequency offset, and the replica peak corresponding to the cyclic shift sequence in the peak detection sequence is eliminated.

If the current root sequence includes multiple cyclic shift sequences, the above steps are repeated until all of the cyclic shift sequences included in the current root sequence are processed. After step 707, when the next cyclic shift sequence is performed in step 702, the peak detection sequence of the current root sequence used is a peak detection sequence in which the previously processed cyclic shift sequence replica peak is eliminated, and thus compared with the above embodiment, The effect of the previous cyclic shift sequence on the current cyclic shift sequence can be reduced, thereby improving the false alarm performance. If the current cell has multiple root sequences, repeat all the above steps until all root sequences have been processed.

In another embodiment of the invention, to further reduce the effect of the replica peak on other sequences, multiple replica peaks can be eliminated. That is, except for eliminating the copy peak closest to the main peak and having the largest value (from the main peak ^ Outside, it can also eliminate the remaining adjacent replica peaks on the same side or on the opposite side or on both sides of the main peak.

(integer multiple of the main peak). Further improved false alarms due to the elimination of multiple replica peaks

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dagger.

From the above description, it can be seen that the method according to the embodiment of the present invention uses the relationship between the main peak and the replica peak with the frequency offset according to the characteristics of the random access signal itself, and replaces the sum of the main peak and the replica peak. The original main peak, the frequency offset compensation is implemented, so as to improve the missed detection performance and false alarm performance of the random access preamble. At the same time, it is also possible to reduce the influence of the frequency offset of the current cyclic shift sequence on other cyclic shift sequences by eliminating one or more replica peaks, thereby further improving the false alarm performance of the system. In addition, since the method provided by the embodiment of the present invention does not need to perform frequency offset estimation and then perform frequency offset compensation, the frequency offset compensation is directly implemented, so the calculation amount is very small, and resources are saved, which is beneficial to the system implementation. In addition, since each user in the detection has its own main peak and replica peak, it is also applicable to frequency offset compensation under multiple users.

Correspondingly, the embodiment of the present invention further provides a frequency offset compensation apparatus for a random access signal, and the structure thereof is as shown in FIG.

The obtaining module 801 is configured to receive a random access signal and obtain a peak detection sequence.

a frequency offset compensation module 802, configured to perform frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence; and a detecting module 803, configured to perform the frequency offset The compensated cyclic shift sequence performs peak detection. Preferably, the obtaining module 801 is further configured to multiply the frequency domain value of the received random access signal and the frequency domain value of the local root sequence or the cyclic shift sequence by a conjugate point, and then perform an inverse fast Fourier transform process. The random access signal is transformed into the time domain and then squared to obtain a peak detection sequence.

Preferably, in another embodiment of the present invention, the frequency offset compensation module may include:

a peak acquisition submodule, configured to acquire a main peak and a replica peak of the cyclic shift sequence; and a calculation submodule, configured to sum the main peak obtained by the peak acquisition submodule and a replica peak, and replace the original value with the sum value The main peak, the frequency offset compensation.

Preferably, in another embodiment of the present invention, the apparatus may further include: a determining module 804, configured to determine whether the peak value of the replica satisfies a validity condition, and notify the frequency offset compensation module of the determination result. Preferably, in another embodiment of the present invention, the apparatus may further include: a deleting module 805, configured to: when the determining module determines that the peak value of the replica meets a validity condition, canceling the cyclic shift in the peak detecting sequence A copy of the sequence's peak.

From the above description, it can be seen that the apparatus according to the embodiment of the present invention uses the sum of the main peak and the replica peak with the frequency offset according to the characteristics of the random access signal itself, and replaces the sum of the main peak and the replica peak. The original main peak, the frequency offset compensation is implemented, so as to improve the missed detection performance and false alarm performance of the random access preamble. At the same time, it is also possible to reduce the influence of the frequency offset of the current cyclic shift sequence on other cyclic shift sequences by eliminating one or more replica peaks, thereby further improving the false alarm performance of the system. In addition, since the apparatus provided by the embodiment of the present invention does not need to perform frequency offset estimation and then performs frequency offset compensation, but directly implements frequency offset compensation, the calculation amount is very small, and resources are saved, which is beneficial to system implementation. In addition, since each user in the detection has its own main peak and replica peak, it is also applicable to frequency offset compensation under multiple users. Correspondingly, the embodiment of the present invention further provides a frequency offset compensation system for a random access signal. As shown in FIG. 9, the terminal 901 includes a terminal 901 and a base station 902, where the terminal 901 is configured to send a random access signal to the base station 902. The base station 902 includes: a frequency offset compensation device 9021 for a random access signal; the device is configured to receive a random access signal to obtain a peak detection sequence; and according to the peak detection sequence, the main peak and the replica peak of the cyclic shift sequence a relationship, performing frequency offset compensation on the cyclic shift sequence; performing peak detection on the cyclic shift sequence after the frequency offset compensation;

Preferably, the frequency offset compensation device 9021 of the random access signal includes:

An acquiring module, configured to receive a random access signal, and obtain a peak detection sequence;

a frequency offset compensation module, configured to perform frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence;

And a detecting module, configured to perform peak detection on the cyclic shift sequence after the frequency offset compensation.

From the above description, it can be seen that the method and apparatus according to the embodiments of the present invention utilize the relationship between the main peak and the replica peak with the frequency offset according to the characteristics of the random access signal itself, using the main peak and the replica peak. And instead of the original main peak, frequency offset compensation is implemented to achieve the purpose of improving the missed detection performance and false alarm performance of the random access preamble. At the same time, it is also possible to reduce the influence of the frequency offset of the current cyclic shift sequence on other cyclic shift sequences by eliminating one or more replica peaks, And further improve the system's false alarm performance. In addition, the method and apparatus provided by the embodiments of the present invention do not need to perform frequency offset estimation and then perform frequency offset compensation, but directly implement frequency offset compensation, so the calculation amount is very small, saving resources, and facilitating system implementation. In addition, since each user in the detection has its own main peak and replica peak, it is also applicable to frequency offset compensation under multiple users. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention

Industrial applicability

The method and the device provided by the invention can eliminate the deterioration of the missed detection performance and the false alarm performance caused by the frequency offset of the random access signal detection, improve the accuracy of the detection, and save resources.

Claims

Claim

A frequency offset compensation method for a random access signal, comprising:

Receiving a random access signal to obtain a peak detection sequence;

Peak detection is performed on the cyclic shift sequence after the frequency offset compensation.

2. The method of claim 1, wherein the step of acquiring a peak detection sequence comprises: locating a frequency domain value of the received random access signal with a frequency domain value of a local root sequence or a local cyclic shift sequence The yoke point is multiplied, and then the random access signal is transformed into the time domain by the inverse fast Fourier transform process to obtain a peak detection sequence.

3. The method according to claim 2, wherein, when the random access signal is a random access channel signal in a repeated format, the peak detection sequence is to repeatedly merge the random access channel signals in the repeated format. The processed peak detection sequence;

4. The method according to claim 1, wherein the step of performing frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence comprises: The main peak of the cyclic shift sequence is summed with the peak of the replica, and the original main peak is replaced by the sum value to implement frequency offset compensation;

5. The method according to claim 1, wherein the step of performing frequency offset compensation on the cyclic shift sequence according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence comprises: When the replica peak satisfies the validity condition, the sum of the main peak and the replica peak of the cyclic shift sequence is replaced by the original main peak; when the replica peak does not satisfy the validity condition, the main peak is unchanged; The main peak is a peak in a search window corresponding to the cyclic shift sequence;

6. The method of claim 5, further comprising: eliminating a replica peak of the cyclic shift sequence in the peak detection sequence when the detection is successful and the replica peak satisfies a validity condition.

7. A frequency offset compensation apparatus for a random access signal, comprising:

An acquisition module, configured to: receive a random access signal to obtain a peak detection sequence; a frequency offset compensation module, configured to: according to a relationship between a main peak and a replica peak of the cyclic shift sequence in the peak detection sequence, to the loop Shift sequence for frequency offset compensation;

And a detecting module, configured to: perform peak detection on the cyclic shift sequence after the frequency offset compensation.

8. The apparatus according to claim 7, wherein the acquiring module is configured to acquire a peak detection sequence in the following manner: the frequency domain value of the received random access signal and the local root sequence or the local cyclic shift sequence The frequency domain value is conjugated by a conjugate point, and then the anti-fast Fourier transform process is used to transform the random access signal into a time domain and then squared to obtain a peak detection sequence.

9. The apparatus of claim 7, wherein the frequency offset compensation module comprises:

10. The apparatus of claim 9, the apparatus further comprising: