CN115412214B - RACH signal detection method and device - Google Patents

Abstract

The present application discloses a method and a device for detecting RACH signals. The method comprises: obtaining a frequency domain signal of a PUSCH OFDM symbol; selecting values on L1 subcarriers from the frequency domain signal according to the target frequency domain position of the RACH signal in the RACH OFDM symbol to form a sequence with a length of L1; Supplement the sequence with 0 to obtain a sequence with a length of N _IFFT 1; perform IFFT of N _IFFT 1 point on the sequence that meets the preset requirements, and obtain the time domain signal corresponding to the sequence that meets the preset requirements; the time domain signal sequence Concatenate, and add 0 to the CP position of the time domain signal after sequential concatenation, and retain the first Γ data, obtain a sequence with a length of Γ, and obtain L _ZC subcarriers carrying RACH frequency domain signals data to get the RACH signal. Through this application, the problem of relatively high computational complexity in the related art is solved.

Description

RACH signal detection method and device

technical field

The present application relates to the technical field of communications, and in particular, to a method and device for detecting RACH signals.

Background technique

In the long-term evolution (LTE, Long Term Evolution) system, after the user terminal (UE, User Equipment) is turned on, it first performs downlink synchronization through the synchronization channel (SCH, Synchronization Channel), and finds the receiving start point and cell number of the radio frame and subframe; Then obtain system information through a broadcast channel (BCH, Broadcast Channel), which includes configuration information of a random access channel (RACH, Random Access Channel); finally perform uplink synchronization through the RACH, and complete the work of accessing the system. The existing detection technology for RACH is shown in Figure 1. In the prior art, an IFFT (Inverse Fast Fourier Transform) with a fixed length of 256 is used, and 256 complex multiplications are required for phase adjustment. Such a processing method The computational complexity is high.

In the related art, when detecting RACH signals, an IFFT with a fixed length of 256 is used, and 256 complex multiplications need to be performed when adjusting the phase, resulting in relatively high computational complexity. No effective solution has been proposed yet.

Contents of the invention

The main purpose of the present application is to provide a detection method and device for a RACH signal, so as to solve the problem of using an IFFT with a fixed length of 256 when detecting a RACH signal in the related art. When adjusting the phase, 256 complex multiplications need to be performed. This leads to a problem of relatively high computational complexity.

In order to achieve the above object, according to one aspect of the present application, a method for detecting an RACH signal is provided. The method comprises: obtaining a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N _PUSCH ; according to the target position in the RACH OFDM symbol, selecting values on L1 subcarriers from the frequency domain signal, Form a sequence of length L1; calculate the maximum downsampling multiple Ds1 and the minimum number of IFFTs N _IFFT 1, where Ds1 is CP1 and CP2 are the CP lengths of the PUSCH OFDM symbol, N _IFFT 1=N _PUSCH /Ds1; the sequence whose length is L1 is complemented with 0 , to obtain a sequence with a length of N _IFFT 1, perform a cyclic shift of a preset number of points on the sequence with a length of N _IFFT 1, and obtain a sequence that meets the preset requirements; perform N _IFFT 1 on the sequence that meets the preset requirements Point IFFT to obtain the time-domain signal corresponding to the sequence that meets the preset requirements; the time-domain signals are sequentially concatenated, and 0 is added to the CP position of the sequentially concatenated time-domain signal to obtain the processed time domain signal, keep the first Γ data in the processed time domain signal, and obtain a sequence with a length of Γ; according to the sequence with a length of Γ, obtain the L _ZC subcarriers carrying the RACH frequency domain signal data to obtain the RACH signal, where L _ZC is the length of the ZC sequence used by the RACH.

Further, the sequence whose length is L1 is supplemented with 0 to obtain a sequence whose length is N _IFFT 1, and the sequence whose length is N _IFFT 1 is cyclically shifted by a preset number of points to obtain a sequence that meets the preset requirements , comprising: setting the values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to 0 to obtain a processed frequency domain signal; performing IFFT processing on the processed frequency domain signal to obtain the A time-domain signal corresponding to the processed frequency-domain signal; performing Ds1 downsampling on the time-domain signal to obtain sampling data; performing FFT processing on the sampling data to obtain a frequency-domain sequence corresponding to the sampling data; When the sequence whose length is N _IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, then the sequence whose length is N _IFFT 1 is a sequence that meets the preset requirements, wherein the definition of two sequences is equivalent Multiplying one sequence by a constant yields the other sequence.

Further, obtaining the frequency domain signal of the PUSCH OFDM symbol includes: obtaining the sampling data of the PUSCH OFDM symbol; performing de-CP processing on the sampling data of the PUSCH OFDM symbol to obtain the sampling data without CP; The sampling data without CP is subjected to FFT transformation of N _PUSCH points to obtain the frequency domain signal of the PUSCH OFDM symbol.

Further, according to the sequence whose length is Γ, acquiring L _ZC data on the subcarriers carrying the RACH frequency domain signal to obtain the RACH signal includes: performing Ds2 times downsampling on the sequence whose length is Γ to obtain L2 data, where Ds2 is The largest positive integer that can be divisible by Γ, Lzc is the ZC sequence length used by RACH; FFT processing is performed on the L2 data to obtain L _ZC data on the subcarrier carrying the RACH frequency domain signal.

Further, L1 is the minimum number of subcarriers including the frequency band occupied by the RACH signal.

Further, the value of Γ is obtained by using the following formula, wherein the formula is Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1, SCS _PUSCH is the subcarrier spacing in the PUSCH OFDM symbol, and SCS _RACH is the subcarrier spacing in RACH OFDM symbols.

In order to achieve the above object, according to another aspect of the present application, a device for detecting a RACH signal is provided. The device includes: a first acquiring unit, configured to acquire a frequency-domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N _PUSCH ; a selecting unit, configured to select from the target position in the RACH OFDM symbol In the frequency domain signal, the values on L1 subcarriers are selected to form a sequence with a length of L1; the calculation unit is used to calculate the maximum downsampling multiple Ds1 and the minimum number of IFFTs N _IFFT 1, where Ds1 is Among all the positive integers of , the largest number that can be divisible by CP1 and CP2 at the same time, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N _IFFT 1=N _PUSCH /Ds1; the first processing unit is used to calculate the length Complementing the sequence of L1 with 0 to obtain a sequence with a length of N _IFFT 1, and performing a cyclic shift of preset points on the sequence with a length of N _IFFT 1 to obtain a sequence that meets the preset requirements; the second processing unit uses Performing _NIFFT 1-point IFFT on the sequence that meets the preset requirements to obtain a time-domain signal corresponding to the sequence that meets the preset requirements; the third processing unit is used to sequentially concatenate the time-domain signals, And at the position of the CP of the time-domain signal after sequential concatenation, complement 0, obtain the time-domain signal after processing, keep the first Γ data in the time-domain signal after described processing, obtain the sequence that length is Γ; The acquiring unit is configured to acquire L _ZC pieces of data on the subcarriers carrying the RACH frequency domain signal according to the sequence of length Γ to obtain the RACH signal, wherein L _ZC is the length of the ZC sequence used by the RACH.

Further, the first processing unit includes: a first processing module, configured to set the values of all subcarriers in the frequency domain signal except the selected L1 subcarriers to 0, to obtain a processed frequency domain signal; The second processing module is configured to perform IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal; the first sampling module is configured to perform Ds1 on the time domain signal Down-sampling to obtain sampled data; a third processing module for performing FFT processing on the sampled data to obtain a frequency domain sequence corresponding to the sampled data; a judging module for when the sequence whose length is N _IFFT 1 When the frequency domain sequence corresponding to the sampling data is equivalent, the sequence whose length is N _IFFT 1 is a sequence that meets the preset requirements, wherein the definition of two sequences being equivalent is that one of the sequences is multiplied by a certain constant Another sequence can be obtained.

Further, the first acquiring unit includes: an acquiring module, configured to acquire sampled data of the PUSCH OFDM symbols; a fourth processing module, configured to perform de-CP processing on the sampled data of the PUSCH OFDM symbols, to obtain The sampling data of the CP; a fifth processing module, configured to perform FFT transformation of N _PUSCH points on the sampling data without the CP to obtain the frequency domain signal of the PUSCH OFDM symbol.

Further, the second acquisition unit includes: a second sampling module, which is used to perform Ds2 times downsampling on the sequence whose length is Γ to obtain L2 data, wherein Ds2 is The largest positive integer that can be divisible by Γ, L _ZC is the ZC sequence length used by RACH; the sixth processing module is used to perform FFT processing on the L2 data to obtain the subcarrier carrying the RACH frequency domain signal. L _ZC data.

Further, L1 is the minimum number of subcarriers including the frequency band occupied by the RACH signal.

Further, the value of Γ is obtained by using the following formula, wherein the formula is Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1, SCS _PUSCH is the subcarrier spacing in the PUSCH OFDM symbol, and SCS _RACH is the subcarrier spacing in RACH OFDM symbols.

In order to achieve the above object, according to another aspect of the present application, a computer-readable storage medium is provided, the storage medium includes a stored program, wherein the program executes the detection method of the RACH signal described in any one of the above .

In order to achieve the above object, according to another aspect of the present application, a processor is provided, the processor is used to run a program, wherein, when the program is running, the method for detecting a RACH signal described in any one of the above is executed.

Through this application, the following steps are adopted to obtain the frequency domain signal of the PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N _PUSCH ; according to the target position in the RACH OFDM symbol, the value on the L1 subcarriers is selected from the frequency domain signal to form A sequence of length L1; calculate the maximum downsampling multiple Ds1 and the minimum number of IFFTs N _IFFT 1, where Ds1 is CP1 and CP2 are the CP lengths of the PUSCH OFDM symbols, N _IFFT 1=N _PUSCH /Ds1; the sequence whose length is L1 is complemented with 0 to obtain a length of For a sequence of N _IFFT 1, do a cyclic shift of the preset number of points on a sequence of length N _IFFT 1 to obtain a sequence that meets the preset requirements; perform an IFFT of N _IFFT 1 point on a sequence that meets the preset requirements to obtain a sequence that meets the preset requirements The time-domain signal corresponding to the required sequence; the time-domain signals are sequentially concatenated, and 0 is added to the CP position of the sequentially concatenated time-domain signal to obtain the processed time-domain signal, and the processed time-domain signal is retained According to the sequence of length Γ, obtain the L _ZC data on the subcarrier carrying the RACH frequency domain signal to obtain the RACH signal, which solves the problem of detecting the RACH signal in the related art When using an IFFT with a fixed length of 256, 256 complex multiplications need to be performed when adjusting the phase, resulting in a problem of relatively high computational complexity. In this application, by adopting the minimum number of IFFTs N _IFFT 1, and performing cyclic shift on the obtained sequence with a length of N _IFFT 1, the phase modulation operation is avoided, and the effect of reducing the computational complexity is achieved.

Description of drawings

The drawings constituting a part of the application are used to provide further understanding of the application, and the schematic embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is the flowchart of the detection method of RACH signal in the prior art;

FIG. 2 is a flowchart of a method for detecting a RACH signal according to an embodiment of the present application;

Fig. 3 is a schematic diagram of an apparatus for detecting a RACH signal according to an embodiment of the present application.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

For ease of description, some nouns or terms involved in the embodiments of the present application are described below:

RACH: Random Access Channel random access channel;

PUSCH: Physical Uplink Channel uplink shared physical channel;

OFDM: Orthogonal Frequency Division Multiplexing technology;

CP: Cyclic Prefix The cyclic prefix is formed by copying the signal at the end of the OFDM symbol to the head;

IFFT: Inverse Fast Fourier Transform Fast Fourier Inverse Transform;

ZC sequence: Zadoff-chu sequence is a sequence sent by communication signals. LTE adopts ZC (Zadoff-Chu) sequence with constant envelope zero autocorrelation (CAZAC, Const Amplitude Zero Auto-Correlation) as the reference sequence of RACH.

The present invention is described below in conjunction with preferred implementation steps. FIG. 2 is a flow chart of a detection method for a RACH signal provided according to an embodiment of the present application. As shown in FIG. 2 , the method includes the following steps:

Step S101, acquiring frequency domain signals of PUSCH OFDM symbols.

In the random access process, if the RACH signal is transmitted, the RACH signal is mixed in the PUSCH OFDM symbol and sent together. It is necessary to extract the RACH signal in the PUSCH OFDM symbol, that is, to detect whether the PUSCH OFDM symbol includes the RACH signal, so first obtain Frequency domain signal of PUSCH OFDM symbols.

Step S102, according to the target position in the RACH OFDM symbol, select values on L1 subcarriers from the frequency domain signal to form a sequence with a length of L1.

The position of the RACH signal in the RACH OFDM symbol is fixed, so the values on consecutive L1 subcarriers can be selected according to the target position to form a sequence with a length of L1, and L1 is the minimum number of subcarriers completely including the RACH occupied frequency band.

Step S103, calculate maximum downsampling multiple Ds1 and minimum IFFT number N _IFFT 1, wherein, Ds1 is Among all positive integers in , the largest number that can be divisible by CP1 and CP2 at the same time, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N _IFFT 1=N _PUSCH /Ds1.

Calculate the maximum downsampling factor Ds1. Ds1 is Among all positive integers in , the largest number that can be divisible by both CP1 and CP2 at the same time. Here, the minimum number of IFFT points is determined as N _IFFT 1 =N _PUSCH /Ds1 . The CP length of the PUSCH OFDM symbol has at most two CP lengths, namely CP1 and CP2. There are 2 lengths in Normal mode, and only 1 CP length in Extended mode.

Step S104, complementing the sequence with length L1 with 0s to obtain a sequence with a length of N _IFFT 1, and performing a cyclic shift with a preset number of points on the sequence with a length of N _IFFT 1 to obtain a sequence that meets the preset requirements.

Set the values of all subcarriers except the selected L1 subcarriers of the frequency domain signal of the PUSCH OFDM symbol to 0 to obtain the processed frequency domain signal; perform IFFT processing on the processed frequency domain signal to obtain the processed frequency domain signal Corresponding time-domain signal; perform Ds1 downsampling on the time-domain signal to obtain sampling data; perform FFT processing on the sampling data to obtain the frequency-domain sequence corresponding to the sampling data. The sequence of length L1 is supplemented with 0 to the sequence of length N _IFFT 1, and the sequence of length N _IFFT 1 is cyclically shifted by the preset number of points, so that the obtained result is the frequency domain sequence corresponding to the above sampling data, etc. price. The equivalence of two sequences is defined as: one sequence is multiplied by a constant to obtain the other sequence.

Step S105, performing N _IFFT 1-point IFFT on the sequence meeting the preset requirement to obtain a time-domain signal corresponding to the sequence meeting the preset requirement.

Perform N _IFFT 1-point IFFT on the sequence obtained in step S104 that meets the preset requirements to obtain the corresponding time-domain signal.

Step S106, sequentially cascading the time-domain signals, and filling the position of the CP of the sequentially concatenated time-domain signals with 0 to obtain the processed time-domain signal, and retaining the first Γ data in the processed time-domain signal, Get a sequence of length Г.

The time-domain signals obtained by step S105 are sequentially concatenated, and the position of the CP of the sequentially concatenated time-domain signals is subjected to zero-filling processing. This is because the CP has been removed when obtaining the PUSCH OFDM symbol, so the corresponding conversion to After the time-domain signal, the original CP position is empty, so the 0-filling process is performed. The first Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1 data is retained.

Step S107, according to the sequence of length Γ, obtain L _ZC data on the subcarriers carrying the RACH frequency domain signal to obtain the RACH signal, where L _ZC is the length of the ZC sequence used by the RACH.

The L _ZC data on the subcarrier carrying the RACH frequency domain signal can be obtained through the sequence of length Γ, and then the L _ZC data can be further correlated with the ZC sequence library to realize the random access process.

To sum up, this application adopts the minimum number of IFFTs N _IFFT 1, and performs cyclic shift on the obtained sequence with a length of N _IFFT 1, avoiding the phase modulation operation, thereby achieving the effect of reducing the computational complexity.

Optionally, in the detection method of the RACH signal provided in the embodiment of the present application, the sequence whose length is L1 is supplemented with 0s to obtain a sequence whose length is N _IFFT 1, and the sequence whose length is N _IFFT 1 is used for preset points Circular shifting to obtain a sequence that meets the preset requirements, including: setting the values of all subcarriers in the frequency domain signal except the selected L1 subcarriers to 0 to obtain a processed frequency domain signal; The signal is processed by IFFT to obtain the time domain signal corresponding to the processed frequency domain signal; the time domain signal is down-sampled by Ds1 times to obtain the sampling data; the sampling data is processed by FFT to obtain the frequency domain sequence corresponding to the sampling data; when the length When the sequence of N _IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, the sequence of length N _IFFT 1 is a sequence that meets the preset requirements, wherein the definition of two sequences being equivalent is that one of the sequences is multiplied by a certain A constant can get another sequence.

First, set the values of all subcarriers except the selected L1 subcarriers of the frequency domain signal of the PUSCH OFDM symbol to 0, then perform IFFT, then perform Ds1 times downsampling, and finally perform FFT processing to obtain the final result, length The sequence of N _IFFT 1 is equivalent to the above result by performing cyclic shift processing of preset points, and the definition of equivalence of two sequences is that one sequence can be multiplied by a certain constant to obtain another sequence.

Through the cyclic shift method, the phase adjustment in the prior art is avoided, and the calculation steps are simplified, thereby reducing the complexity of the calculation.

Optionally, in the detection method of the RACH signal provided in the embodiment of the present application, obtaining the frequency domain signal of the PUSCH OFDM symbol includes: obtaining the sampling data of the PUSCH OFDM symbol; performing de-CP processing on the sampling data of the PUSCH OFDM symbol to obtain Sampling data without CP; FFT transformation of N _PUSCH points is performed on the sampling data without CP to obtain frequency domain signals of PUSCHOFDM symbols.

Perform CP processing on the sampling data of PUSCH OFDM symbols, and then adjust the frequency shift as needed (LTE system needs to do 1/2SCS _PUSCH frequency shift adjustment, NR system does not need to do frequency shift adjustment), and then do N _PUSCH points Through FFT transformation, the frequency domain signal of the PUSCH OFDM symbol is obtained.

The sampling data of the PUSCH OFDM symbol is converted into frequency domain information, so as to facilitate the selection of subcarriers of the included RACH signal.

Optionally, in the detection method of the RACH signal provided in the embodiment of the present application, according to the sequence whose length is Γ, L _ZC pieces of data on the subcarriers carrying the RACH frequency domain signal are obtained to obtain the RACH signal, including: Do Ds2 times downsampling for the sequence of Г to obtain L2 data, wherein, Ds2 is the largest positive integer divisible by Г in 1～[Г/L _ZC ], and L _ZC is the length of the ZC sequence used by RACH; for L2 The data are processed by FFT to obtain L _ZC data on the subcarriers carrying the RACH frequency domain signal.

Calculate the maximum multiple Ds2 of the second downsampling, Ds2 is the largest positive integer divisible by Г among 1～[Г/L _ZC ], and then perform Ds2 times downsampling on the sequence of length Г to obtain L2 data. Perform FFT processing on the above L2 data to obtain L _ZC data on subcarriers carrying RACH frequency domain signals.

Ds2 downsampling is performed on the sequence of length Г to reduce the amount of data, thereby achieving the effect of reducing the complexity of the operation.

Optionally, in the method for detecting the RACH signal provided in the embodiment of the present application, L1 is the minimum number of subcarriers including the frequency band occupied by the RACH signal.

Optionally, in the method for detecting the RACH signal provided in the embodiment of the present application, the value of Γ is obtained by using the following formula, where the formula is Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1, and the SCS _PUSCH is PUSCH is the subcarrier spacing in OFDM symbols, SCS _RACH is the subcarrier spacing in RACH OFDM symbols.

The detection method of the RACH signal provided by the embodiment of the present application obtains the frequency domain signal of the PUSCH OFDM symbol, wherein, the length of the PUSCH OFDM symbol is N _PUSCH ; according to the target position in the RACH OFDM symbol, select L1 sub-signals from the frequency domain signal The values on the carrier form a sequence of length L1; calculate the maximum downsampling multiple Ds1 and the minimum number of IFFTs N _IFFT 1, where Ds1 is CP1 and CP2 are the CP lengths of the PUSCH OFDM symbols, N _IFFT 1=N _PUSCH /Ds1; the sequence whose length is L1 is complemented with 0 to obtain a length of For a sequence of N _IFFT 1, do a cyclic shift of the preset number of points on a sequence of length N _IFFT 1 to obtain a sequence that meets the preset requirements; perform an IFFT of N _IFFT 1 point on a sequence that meets the preset requirements to obtain a sequence that meets the preset requirements The time-domain signal corresponding to the required sequence; the time-domain signals are sequentially concatenated, and 0 is added to the CP position of the sequentially concatenated time-domain signal to obtain the processed time-domain signal, and the processed time-domain signal is retained According to the sequence of length Γ, obtain the L _ZC data on the subcarrier carrying the RACH frequency domain signal to obtain the RACH signal, which solves the problem of detecting the RACH signal in the related art When using an IFFT with a fixed length of 256, 256 complex multiplications need to be performed when adjusting the phase, resulting in a problem of relatively high computational complexity. In this application, by adopting the minimum number of IFFTs N _IFFT 1, and performing cyclic shift on the obtained sequence with a length of N _IFFT 1, the phase modulation operation is avoided, and the effect of reducing the computational complexity is achieved.

It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

The embodiment of the present application also provides a device for detecting a RACH signal. It should be noted that the device for detecting a RACH signal in the embodiment of the present application can be used to implement the method for detecting a RACH signal provided in the embodiment of the present application. The apparatus for detecting a RACH signal provided in the embodiment of the present application is introduced below.

Fig. 3 is a schematic diagram of an apparatus for detecting a RACH signal according to an embodiment of the present application. As shown in FIG. 3 , the device includes: a first acquisition unit 301 , an selection unit 302 , a calculation unit 303 , a first processing unit 304 , a second processing unit 305 , a third processing unit 306 and a second acquisition unit 307 .

The first obtaining unit 301 is configured to obtain a frequency domain signal of a PUSCH OFDM symbol, where the length of the PUSCH OFDM symbol is N _PUSCH .

The selection unit 302 is configured to select values on L1 subcarriers from the frequency domain signal according to the target position in the RACH OFDM symbol to form a sequence with a length of L1.

Calculation unit 303, for calculating the maximum downsampling multiple Ds1 and the minimum number of IFFTs N _IFFT 1, wherein Ds1 is Among all positive integers in , the largest number that can be divisible by CP1 and CP2 at the same time, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N _IFFT 1=N _PUSCH /Ds1.

The first processing unit 304 is used to complement the sequence with a length of L1 to obtain a sequence with a length of N _IFFT 1, and perform a cyclic shift of a preset number of points on the sequence with a length of N _IFFT 1 to obtain a sequence that meets the preset requirements. sequence;

The second processing unit 305 is configured to perform N _IFFT 1-point IFFT on the sequence meeting the preset requirement to obtain a time-domain signal corresponding to the sequence meeting the preset requirement.

The third processing unit 306 is configured to sequentially concatenate the time-domain signals, and perform 0-filling at the position of the CP of the sequentially concatenated time-domain signals to obtain the processed time-domain signal, and retain the processed time-domain signal The first Г data, get a sequence of length Г.

The second acquiring unit 307 is configured to acquire L _ZC pieces of data on the subcarriers carrying the RACH frequency domain signal according to the sequence of length Γ to obtain the RACH signal, wherein L _ZC is the length of the ZC sequence used by the RACH.

The detection device of the RACH signal provided by the embodiment of the present application obtains the frequency domain signal of the PUSCHOFDM symbol through the first acquisition unit 301; the selection unit 302 selects the value on the L1 subcarriers from the frequency domain signal according to the target position in the RACH OFDM symbol , to form a sequence with a length of L1; the calculation unit 303 calculates the maximum downsampling multiple Ds1 and the minimum number of IFFTs N _IFFT 1; the first processing unit 304 complements the sequence with a length of L1 to obtain a sequence with a length of N _IFFT 1 , do a cyclic shift of a preset number of points to a sequence whose length is N _IFFT 1, and obtain a sequence that meets the preset requirements; the second processing unit 305 performs an IFFT of N _IFFT 1 points on a sequence that meets the preset requirements, and obtains a sequence that meets the preset requirements. The time-domain signal corresponding to the required sequence; the third processing unit 306 sequentially concatenates the time-domain signals, and fills the position of the CP of the sequentially concatenated time-domain signals with 0 to obtain the processed time-domain signal, and retains the processing The first Γ data in the subsequent time domain signal obtains a sequence of length Γ; the second acquisition unit 307 obtains L _ZC data on the subcarrier carrying the RACH frequency domain signal according to the sequence of length Γ to obtain the RACH signal , to solve the problem in the related art that when the RACH signal is detected, an IFFT with a fixed length of 256 is used, and when the phase is adjusted, 256 complex multiplications need to be performed, resulting in relatively high computational complexity. In this application, by adopting the minimum number of IFFTs N _IFFT 1, and performing cyclic shift on the obtained sequence with a length of N _IFFT 1, the phase modulation operation is avoided, and the effect of reducing the computational complexity is achieved.

Optionally, in the device for detecting a RACH signal provided in the embodiment of the present application, the first processing unit includes: a first processing module configured to set the values of all subcarriers in the frequency domain signal except the selected L1 subcarriers is 0, the frequency domain signal after processing is obtained; the second processing module is used to perform IFFT processing on the frequency domain signal after processing, and obtains the time domain signal corresponding to the frequency domain signal after processing; the first sampling module is used for The time-domain signal is down-sampled by Ds1 to obtain sampled data; the third processing module is used to perform FFT processing on the sampled data to obtain a frequency-domain sequence corresponding to the _sampled data; When the frequency-domain sequences corresponding to the sampling data are equivalent, the sequence with a length of N _IFFT 1 is a sequence that meets the preset requirements. Among them, the definition of equivalence between two sequences is that one sequence can be multiplied by a certain constant to obtain another sequence .

Optionally, in the device for detecting a RACH signal provided in the embodiment of the present application, the first acquisition unit includes: an acquisition module, configured to acquire sampled data of a PUSCH OFDM symbol; a fourth processing module, configured to convert the sampled data of a PUSCH OFDM symbol to The data is subjected to CP removal processing to obtain sampled data without CP; the fifth processing module is used to perform FFT transformation of N _PUSCH points on the sampled data without CP to obtain frequency domain signals of PUSCH OFDM symbols.

Optionally, in the RACH signal detection device provided in the embodiment of the present application, the second acquisition unit includes: a second sampling module, configured to perform Ds2 times downsampling on a sequence with a length of Γ to obtain L2 data, wherein, Ds2 is the largest positive integer divisible by Г from 1 to [Г/L _Z C], L _ZC is the length of the ZC sequence used by RACH; perform FFT processing on the L2 data to obtain the subcarrier carrying the RACH frequency domain signal L _ZC data on the above.

Optionally, in the apparatus for detecting a RACH signal provided in the embodiment of the present application, L1 is the minimum number of subcarriers including the frequency band occupied by the RACH signal.

Optionally, in the RACH signal detection device provided in the embodiment of the present application, the value of Γ is obtained by using the following formula, wherein the formula is Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1, SCS _PUSCH is the subcarrier spacing in PUSCH OFDM symbols, and SCS _RACH is the subcarrier spacing in RACH OFDM symbols.

The detection device of the RACH signal includes a processor and a memory, the first acquisition unit 301, the selection unit 302, the calculation unit 303, the first processing unit 304, the second processing unit 305, the third processing unit 306 and the second acquisition unit 307. etc. are stored in the memory as program units, and the processor executes the above program units stored in the memory to realize corresponding functions.

The processor includes a kernel, and the kernel fetches corresponding program units from the memory. One or more kernels can be set, and the detection of RACH signals can be realized by adjusting kernel parameters.

Memory may include non-permanent memory in computer-readable media, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), memory includes at least one memory chip.

An embodiment of the present invention provides a storage medium on which a program is stored, and when the program is executed by a processor, the method for detecting the RACH signal is realized.

An embodiment of the present invention provides a processor, and the processor is configured to run a program, wherein the method for detecting the RACH signal is executed when the program is running.

An embodiment of the present invention provides a device. The device includes a processor, a memory, and a program stored in the memory and operable on the processor. When the processor executes the program, the following steps are implemented: acquiring the frequency domain signal of the PUSCH OFDM symbol, wherein , the length of the PUSCH OFDM symbol is N _PUSCH ; according to the target position in the RACH OFDM symbol, the values on the L1 subcarriers are selected from the frequency domain signal to form a sequence with a length of L1; calculate the maximum downsampling multiple Ds1 and the minimum IFFT number N _IFFT 1, where Ds1 is CP1 and CP2 are the CP lengths of the PUSCH OFDM symbols, N _IFFT 1=N _PUSCH /Ds1; the sequence whose length is L1 is complemented with 0 to obtain a length of For a sequence of N _IFFT 1, do a cyclic shift of the preset number of points on a sequence of length N _IFFT 1 to obtain a sequence that meets the preset requirements; perform an IFFT of N _IFFT 1 point on a sequence that meets the preset requirements to obtain a sequence that meets the preset requirements The time-domain signal corresponding to the required sequence; the time-domain signals are sequentially concatenated, and 0 is added to the CP position of the sequentially concatenated time-domain signal to obtain the processed time-domain signal, and the processed time-domain signal is retained The first Γ data in the middle is obtained as a sequence of length Γ; according to the sequence of length Γ, the L _ZC data on the subcarrier carrying the RACH frequency domain signal is obtained to obtain the RACH signal, wherein L _ZC is used by the RACH The length of the ZC sequence.

Optionally, the sequence whose length is L1 is supplemented with 0 to obtain a sequence whose length is N _IFFT 1, and the sequence whose length is N _IFFT 1 is cyclically shifted by a preset number of points to obtain a sequence that meets the preset requirements, including: Set the values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to 0 to obtain the processed frequency domain signal; perform IFFT processing on the processed frequency domain signal to obtain the corresponding Time-domain signal; perform Ds1 downsampling on the time-domain signal to obtain sampled data; perform FFT processing on the sampled data to obtain the frequency-domain sequence corresponding to the sampled data; when the sequence whose length is N _IFFT 1 corresponds to the frequency-domain sequence of the sampled data When they are equivalent, the sequence whose length is N _IFFT 1 is a sequence that meets the preset requirements, wherein the definition of two sequences being equivalent is that one sequence can be multiplied by a certain constant to obtain another sequence.

Optionally, obtaining the frequency domain signal of the PUSCH OFDM symbol includes: obtaining the sampling data of the PUSCH OFDM symbol; performing de-CP processing on the sampling data of the PUSCH OFDM symbol to obtain sampling data without CP; sampling data without CP Perform FFT transformation of N _PUSCH points to obtain frequency domain signals of PUSCH OFDM symbols.

Optionally, according to the sequence whose length is Γ, obtain L _ZC data on the subcarriers carrying the RACH frequency domain signal to obtain the RACH signal, including: performing Ds2 times downsampling on the sequence whose length is Γ to obtain L2 data , wherein, Ds2 is the largest positive integer that can be divisible by Г among 1～[Г/L _ZC ], L _ZC is the ZC sequence length used by RACH; FFT processing is performed on L2 data to obtain the frequency domain signal carrying RACH L _ZC data on subcarriers.

Optionally, L1 is the minimum number of subcarriers including the frequency band occupied by the RACH signal.

Optionally, the value of Γ is obtained by using the following formula, where the formula is Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1, where SCS _PUSCH is the subcarrier spacing in the PUSCH OFDM symbol, and SCS _RACH is the RACH OFDM Subcarrier spacing in a symbol. The devices in this article can be servers, PCs, PADs, mobile phones, etc.

The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: acquiring a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N _PUSCH ; According to the target position in the RACH OFDM symbol, select the value on the L1 subcarriers from the frequency domain signal to form a sequence with a length of L1; calculate the maximum downsampling multiple Ds1 and the minimum IFFT number N _IFFT 1, where Ds1 is CP1 and CP2 are the CP lengths of the PUSCH OFDM symbols, N _IFFT 1=N _PUSCH /Ds1; the sequence whose length is L1 is complemented with 0 to obtain a length of For a sequence of N _IFFT 1, do a cyclic shift of the preset number of points on a sequence of length N _IFFT 1 to obtain a sequence that meets the preset requirements; perform an IFFT of N _IFFT 1 point on a sequence that meets the preset requirements to obtain a sequence that meets the preset requirements The time-domain signal corresponding to the required sequence; the time-domain signals are sequentially concatenated, and 0 is added to the CP position of the sequentially concatenated time-domain signal to obtain the processed time-domain signal, and the processed time-domain signal is retained The first Γ data in the middle is obtained as a sequence of length Γ; according to the sequence of length Γ, the L _ZC data on the subcarrier carrying the RACH frequency domain signal is obtained to obtain the RACH signal, wherein L _ZC is used by the RACH The length of the ZC sequence.

Optionally, the sequence whose length is L1 is supplemented with 0 to obtain a sequence whose length is N _IFFT 1, and the sequence whose length is N _IFFT 1 is cyclically shifted by a preset number of points to obtain a sequence that meets the preset requirements, including: Set the values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to 0 to obtain the processed frequency domain signal; perform IFFT processing on the processed frequency domain signal to obtain the corresponding Time-domain signal; perform Ds1 downsampling on the time-domain signal to obtain sampled data; perform FFT processing on the sampled data to obtain the frequency-domain sequence corresponding to the sampled data; when the sequence whose length is N _IFFT 1 corresponds to the frequency-domain sequence of the sampled data When they are equivalent, the sequence whose length is N _IFFT 1 is a sequence that meets the preset requirements, wherein the definition of two sequences being equivalent is that one sequence can be multiplied by a certain constant to obtain another sequence.

Optionally, obtaining the frequency domain signal of the PUSCH OFDM symbol includes: obtaining the sampling data of the PUSCH OFDM symbol; performing de-CP processing on the sampling data of the PUSCH OFDM symbol to obtain sampling data without CP; sampling data without CP Perform FFT transformation of N _PUSCH points to obtain frequency domain signals of PUSCH OFDM symbols.

Optionally, according to the sequence whose length is Γ, obtain L _ZC data on the subcarriers carrying the RACH frequency domain signal to obtain the RACH signal, including: performing Ds2 times downsampling on the sequence whose length is Γ to obtain L2 data , wherein, Ds2 is the largest positive integer that can be divisible by Г among 1～[Г/L _ZC ], L _ZC is the ZC sequence length used by RACH; FFT processing is performed on L2 data to obtain the frequency domain signal carrying RACH L _ZC data on subcarriers.

Optionally, L1 is the minimum number of subcarriers including the frequency band occupied by the RACH signal.

Optionally, the value of Γ is obtained by using the following formula, where the formula is Γ=N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1, where SCS _PUSCH is the subcarrier spacing in the PUSCH OFDM symbol, and SCS _RACH is the RACH OFDM Subcarrier spacing in a symbol.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-permanent storage in computer readable media, in the form of random access memory (RAM) and/or nonvolatile memory such as read only memory (ROM) or flash RAM. The memory is an example of a computer readable medium.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims (7)

1. A method for detecting a RACH signal, comprising:

acquiring a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N _PUSCH ；

Selecting values on L1 subcarriers from the frequency domain signal according to the target position in the RACH OFDM symbol to form a sequence with the length of L1;

Calculating the maximum downsampling multiple Ds1 and the minimum IFFT number N _IFFT 1, wherein Ds1 isThe maximum number of all positive integers of (1) can be divided by CP1 and CP2 at the same time, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N _IFFT 1＝N _PUSCH /Ds1；

Supplementing 0 to the sequence with the length of L1 to obtain a sequence with the length of N _IFFT 1, for said length N _IFFT 1, performing cyclic shift of preset points on the sequence to obtain a sequence meeting preset requirements;

n is carried out on the sequence meeting the preset requirement _IFFT 1-point IFFT, obtaining the time domain signal corresponding to the sequence meeting the preset requirement;

sequentially cascading the time domain signals, supplementing 0 to the CP position of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving the front f data in the processed time domain signals to obtain a sequence with the length of f;

acquiring L on a subcarrier carrying RACH frequency domain signal according to the sequence with the length of gamma _ZC Data to obtain RACH signal, wherein L _ZC The length of the ZC sequence used for RACH;

the method comprises the steps of supplementing 0 to the sequence with the length of L1 to obtain a sequence with the length of NIFFT1, performing cyclic shift of preset points to the sequence with the length of NIFFT1 to obtain a sequence meeting preset requirements, and comprises the following steps:

Setting the values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to 0 to obtain a processed frequency domain signal;

performing IFFT processing on the processed frequency domain signals to obtain time domain signals corresponding to the processed frequency domain signals;

performing Ds1 times downsampling on the time domain signal to obtain sampling data;

performing FFT processing on the sampling data to obtain a frequency domain sequence corresponding to the sampling data;

when the sequence with the length of NIFFT1 is equivalent to the frequency domain sequence corresponding to the sampling data, the sequence with the length of NIFFT1 is a sequence meeting the preset requirement, wherein the two sequences are equivalent, and one sequence can be obtained by multiplying a certain constant by the other sequence;

according to the sequence with the length of f, obtaining LZC data on subcarriers carrying RACH frequency domain signals to obtain RACH signals, including:

performing Ds2 times downsampling on the sequence with the length of gamma to obtain L2 data, wherein Ds2 is 1 to the whole lengthThe largest positive integer divisible by r, L _zc The ZC sequence length used for RACH;

FFT processing is carried out on the L2 data to obtain L on subcarriers carrying RACH frequency domain signals _ZC Data.

2. The method of claim 1, wherein obtaining the frequency domain signal of the PUSCH OFDM symbol comprises:

acquiring sampling data of the PUSCH OFDM symbol;

performing CP removal processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP;

n is carried out on the sampled data without CP _PUSCH And carrying out FFT conversion on the points to obtain the frequency domain signal of the PUSCHOFDM symbol.

3. The method of claim 1 wherein L1 is the number of minimum subcarriers comprising the RACH signal occupied band.

4. The method according to claim 1, characterized in that the value of r is obtained using the formula Γ = N _PUSCH ×(SCS _PUSCH /SCS _RACH )/D _s 1，SCS _PUSCH Is the subcarrier spacing in the PUSCH OFDM symbol, SCS _RACH Is the subcarrier spacing in the RACH OFDM symbol.

5. A RACH signal detection apparatus, comprising:

a first obtaining unit, configured to obtain a frequency domain signal of a PUSCH OFDM symbol, where a length of the PUSCH OFDM symbol is N _PUSCH ；

A selecting unit, configured to select values on L1 subcarriers from the frequency domain signal according to a target position in the RACH OFDM symbol, to form a sequence with a length of L1;

A calculating unit for calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N _IFFT 1, wherein Ds1 isThe largest number of all positive integers that can be divided by CP1 and CP2 at the same time, CP1 and CP2 beingThe CP length of the PUSCH OFDM symbol, N _IFFT 1＝N _PUSCH /Ds1；

A first processing unit for supplementing 0 to the sequence with the length of L1 to obtain a sequence with the length of N _IFFT 1, for said length N _IFFT 1, performing cyclic shift of preset points on the sequence to obtain a sequence meeting preset requirements;

a second processing unit for performing N on the sequence meeting the preset requirement _IFFT 1-point IFFT, obtaining the time domain signal corresponding to the sequence meeting the preset requirement;

the third processing unit is used for sequentially cascading the time domain signals, supplementing 0 to the CP position of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving the former f data in the processed time domain signals to obtain a sequence with the length of f;

a second obtaining unit for obtaining L on the subcarrier carrying RACH frequency domain signal according to the sequence with the length of f _ZC Data to obtain RACH signal, wherein L _ZC The length of the ZC sequence used for RACH;

wherein the first processing unit includes:

The first processing module is used for setting the numerical value of all subcarriers except the selected L1 subcarriers in the frequency domain signal to 0 to obtain a processed frequency domain signal;

the second processing module is used for performing IFFT processing on the processed frequency domain signals to obtain time domain signals corresponding to the processed frequency domain signals;

the first sampling module is used for performing Ds1 times downsampling on the time domain signal to obtain sampling data;

the third processing module is used for carrying out FFT processing on the sampling data to obtain a frequency domain sequence corresponding to the sampling data;

the judging module is used for judging that when the sequence with the length of NIFFT1 is equivalent to the frequency domain sequence corresponding to the sampling data, the sequence with the length of NIFFT1 is a sequence meeting the preset requirement, wherein the two equivalent sequences are defined as one sequence multiplied by a certain constant to obtain the other sequence;

wherein the second acquisition unit includes: a second sampling module, configured to downsample the sequence with the length f by Ds2 times to obtain L2 data, where Ds2 isThe largest positive integer divisible by r, L _ZC The ZC sequence length used for RACH; a sixth processing module for performing FFT processing on the L2 data to obtain L on the subcarrier carrying RACH frequency domain signal _ZC Data.

6. A computer-readable storage medium storing a program, wherein the program performs the RACH signal detection method of any one of claims 1 to 4.

7. A processor, characterized in that the processor is configured to run a program, wherein the program runs to perform the RACH signal detection method according to any one of claims 1 to 4.