CN115412214B - RACH signal detection method and device - Google Patents

RACH signal detection method and device Download PDF

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Publication number
CN115412214B
CN115412214B CN202111605303.2A CN202111605303A CN115412214B CN 115412214 B CN115412214 B CN 115412214B CN 202111605303 A CN202111605303 A CN 202111605303A CN 115412214 B CN115412214 B CN 115412214B
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sequence
length
rach
frequency domain
ifft
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CN115412214A (en
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何磊
张河
张彦琦
辛颖
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Bicocq Microelectronics Hangzhou Co ltd
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Bicocq Microelectronics Hangzhou Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
    • H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application discloses a method and a device for detecting RACH signals. The method comprises the following steps: acquiring a frequency domain signal of a PUSCHOFDM 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 the length of L1; adding 0 to the sequence with the length of L1 to obtain a sequence with the length of N IFFT 1; n is carried out on the sequence meeting the preset requirement IFFT 1-point IFFT to obtain a time domain signal corresponding to a sequence meeting preset requirements; sequentially concatenating the time domain signals, supplementing 0 at the CP position of the time domain signals after the sequential concatenating, reserving the former R data to obtain a sequence with the length of R, and obtaining L on subcarriers bearing RACH frequency domain signals ZC Data to obtain RACH signals. The application solves the problem of higher operation complexity in the related technology.

Description

RACH signal detection method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and apparatus for detecting RACH signals.
Background
In a long term evolution (LTE, long Term Evolution) system, after a User Equipment (UE) is powered on, firstly, downlink synchronization is performed through a synchronization channel (SCH, synchronization Channel), so as to find a reception start point and a cell number of a radio frame and a subframe; then acquiring system information through a broadcast channel (BCH, broadcast Channel), wherein the system information comprises configuration information of a random access channel (RACH, random Access Channel); and finally, carrying out uplink synchronization through the RACH to finish the work of an access system. As shown in fig. 1, in the conventional RACH detection technique, an IFFT (inverse fast fourier transform) with a fixed length of 256 is used, and 256 complex multiplications are required to perform phase adjustment, and such a processing method has a high computational complexity.
Aiming at the problem that 256 complex multiplications are needed to be carried out when the fixed length of 256 IFFT is adopted to detect the RACH signals in the related art and the phase is adjusted, the operation complexity is high, and no effective solution is proposed at present.
Disclosure of Invention
The application mainly aims to provide a method and a device for detecting a RACH signal, which are used for solving the problem that in the related art, when the RACH signal is detected, an IFFT with a fixed length of 256 is adopted, and when the phase is adjusted, 256 complex multiplications are needed, so that the operation complexity is higher.
In order to achieve the above object, according to one aspect of the present application, there is provided a method of detecting RACH signals. The method comprises the following steps: acquiring a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH The method comprises the steps of carrying out a first treatment on the surface of the 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 informationNumber, where L ZC The length of the ZC sequence used for RACH.
Further, the sequence with the length of L1 is complemented with 0 to obtain a sequence with the length of N IFFT 1, for said length N IFFT 1 to obtain a sequence meeting 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 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 length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampled data, then the length is N IFFT 1 is a sequence meeting the preset requirement, wherein two sequences are defined as one sequence being multiplied by a certain constant to obtain the other sequence.
Further, acquiring the frequency domain signal of the PUSCH OFDM symbol includes: 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 (fast Fourier transform) on the points to obtain the frequency domain signal of the PUSCH OFDM symbol.
Further, according to the sequence with the length of f, obtaining L on the subcarrier carrying RACH frequency domain signal ZC Data to obtain RACH signals, comprising: performing Ds2 times downsampling on the sequence with the length of gamma to obtain L2 data, wherein Ds2 isThe maximum positive integer which can be divided by the gamma integer is Lzc which is the ZC sequence length used by the RACH; FFT processing is carried out on the L2 data to obtain L on subcarriers carrying RACH frequency domain signals ZC Data.
Further, L1 is the number of the least subcarriers including the occupied frequency band of the RACH signal.
Further, the value of f 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.
In order to achieve the above object, according to another aspect of the present application, there is provided a detection apparatus of RACH signal. The device comprises: 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 The method comprises the steps of carrying out a first treatment on the surface of the 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 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; 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.
Further, 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; a judging module for when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampled data, then the length is N IFFT 1 is a sequence meeting the preset requirement, wherein two sequences are defined as one sequence being multiplied by a certain constant to obtain the other sequence.
Further, the first acquisition unit includes: an acquisition module, configured to acquire sampling data of the PUSCH OFDM symbol; a fourth processing module, configured to perform CP removal processing on the sampled data of the PUSCH OFDM symbol, to obtain sampled data without CP; a fifth processing module, configured to perform N on the sampled data without CP PUSCH And carrying out FFT (fast Fourier transform) on the points to obtain the frequency domain signal of the PUSCH OFDM symbol.
Further, 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.
Further, L1 is the number of the least subcarriers including the occupied frequency band of the RACH signal.
Further, the following formula is used to obtain the value of f, 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, SCS RACH Is the subcarrier spacing in the RACH OFDM symbol.
In order to achieve the above object, according to another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the program performs the RACH signal detection method according to any one of the above.
In order to achieve the above object, according to another aspect of the present application, there is provided a processor for executing a program, wherein the program executes the RACH signal detection method according to any one of the above.
The application acquires the frequency domain signal of the PUSCH OFDM symbol by adopting the following steps, wherein the length of the PUSCH OFDM symbol is N PUSCH The method comprises the steps of carrying out a first treatment on the surface of the 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 largest number of all positive integers that can be divided by CP1 and CP2 at the same time, CP1 and CP2 being the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH Ds1; supplementing 0 to the sequence with length L1 to obtain the sequence with length N IFFT 1, for a length of 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 to obtain a time domain signal corresponding to a sequence meeting preset requirements; sequentially cascading the time domain signals, supplementing 0 to the CP position of the time domain signals after the sequential cascading to obtain the 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; acquiring L on sub-carrier carrying RACH frequency domain signal according to sequence with length of gamma ZC Data to obtain RACH signal, solveIn the related art, when detecting the RACH signal, an IFFT with a fixed length of 256 is adopted, and when adjusting the phase, 256 complex multiplications are required, which results in a problem of relatively high operation complexity. The application adopts the minimum IFFT number N IFFT 1, and for the obtained length N IFFT 1, the phase modulation operation is avoided, and the effect of reducing the operation complexity is further achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
Fig. 1 is a flowchart of a method for detecting a 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 a RACH signal detection apparatus according to an embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:
RACH: random Access Channel random access channel;
PUSCH: physical Uplink Channel uplink shared physical channel;
OFDM: orthogonal Frequency Division Multiplexing orthogonal frequency division multiplexing;
CP: the Cyclic Prefix is formed by copying signals at the tail part of an OFDM symbol to the head part;
IFFT: inverse Fast Fourier Transform inverse fast fourier transform;
ZC sequence: the Zadoff-Chu sequence is a sequence sent by a communication signal, and the ZC (Zadoff-Chu) sequence with constant envelope zero auto-Correlation (CAZAC, const AmplitudeZero Auto-Correlation) is adopted by LTE as a reference sequence of the RACH.
The present application will be described with reference to preferred implementation steps, and fig. 2 is a flowchart of a method for detecting RACH signals according to an embodiment of the present application, as shown in fig. 2, and includes the following steps:
step S101, a frequency domain signal of a PUSCH OFDM symbol is acquired.
In the random access process, if the RACH signal is transmitted, the RACH signal is mixed and transmitted together in the PUSCH OFDM symbol, and the RACH signal needs to be extracted from the PUSCH OFDM symbol, that is, whether the PUSCH OFDM symbol includes the RACH signal is detected, so that the frequency domain signal of the PUSCH OFDM symbol is acquired first.
Step S102, selecting the value of L1 sub-carrier from the frequency domain signal according to the target position in the RACH OFDM symbol, and forming a sequence with length of L1.
The position of the RACH signal in the RACH OFDM symbol is fixed, so that the value on the consecutive L1 subcarriers can be selected according to the target position, a sequence with a length of L1 is formed, and L1 is the minimum number of subcarriers completely containing the RACH occupied frequency band.
Step S103, 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 being the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH /Ds1。
The maximum downsampling multiple Ds1 is calculated. Ds1 isThe largest number that can be divided by CP1 and CP2 at the same time, among all positive integers. The minimum number of IFFT points is determined to be N IFFT 1＝N PUSCH Ds1. The CP length of the PUSCH OFDM symbol has at most two CP lengths, CP1 and CP2, respectively. The length is 2 in Normal mode and the CP length is only 1 in Extended mode.
Step S104, 0 is complemented to the sequence with the length of L1 to obtain the sequence with the length of N IFFT 1, for a length of N IFFT 1 to obtain a sequence meeting preset requirements.
Setting the values of all subcarriers except the selected L1 subcarriers of the frequency domain signal of the PUSCH OFDM symbol to 0 to obtain a processed frequency domain signal; performing IFFT (inverse fast Fourier transform) 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; and carrying out FFT processing on the sampling data to obtain a frequency domain sequence corresponding to the sampling data. Post-compensating the sequence with the length of L1 to the length of N by 0 IFFT 1, for a length of N IFFT 1 to make a cyclic shift of a preset number of points so that the obtained result is the same as the aboveThe frequency domain sequences corresponding to the sampled data are equivalent. Two sequences are defined equivalently as: one of the sequences is multiplied by a constant to obtain the other sequence.
Step S105, N is performed on the sequence meeting the preset requirement IFFT And (3) obtaining a time domain signal corresponding to the sequence meeting the preset requirement by 1-point IFFT.
N is the sequence meeting the preset requirement obtained in the step S104 IFFT And (3) performing IFFT on 1 point to obtain a corresponding time domain signal.
Step S106, the time domain signals are sequentially cascaded, and 0 is supplemented at the CP position of the time domain signals after the sequential cascading, so that the processed time domain signals are obtained, and the front f data in the processed time domain signals are reserved, so that a sequence with the length of f is obtained.
The time domain signals obtained by step S105 are sequentially concatenated, and the position of the CP of the time domain signal after the sequential concatenation is subjected to zero padding processing, because the CP has been removed when the PUSCH OFDM symbol is acquired, and after the corresponding conversion to the time domain signal, the position of the original CP is null, so the 0 padding processing is performed. Pre-reservation Γ=n PUSCH ×(SCS PUSCH /SCS RACH )/D s 1 data.
Step S107, obtaining L on the subcarrier carrying RACH frequency domain signal according to the sequence with length of f ZC Data to obtain RACH signal, wherein L ZC The length of the ZC sequence used for RACH.
L on the subcarrier carrying RACH frequency domain signal can be obtained by the sequence with the length of R ZC Data, then L can be further processed ZC The data are related to the ZC sequence library, and the random access process is realized.
In summary, the application adopts the minimum IFFT number N IFFT 1, and for the obtained length N IFFT 1, the phase modulation operation is avoided, and the effect of reducing the operation complexity is further achieved.
Optionally, in the method for detecting RACH signals provided in the embodiment of the present application, 0 is added to a sequence with a length of L1 to obtain a sequence with a length of N IFFT 1, for a length of N IFFT 1 to obtain a sequence meeting 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 (inverse fast Fourier transform) 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; carrying out FFT processing on the sampling data to obtain a frequency domain sequence corresponding to the sampling data; when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, then the length is N IFFT 1 is a sequence meeting the preset requirement, wherein two sequences are defined as one sequence being multiplied by a certain constant to obtain the other sequence.
Firstly, setting the value of all sub-carriers except the selected L1 sub-carriers of the frequency domain signal of the PUSCH OFDM symbol to 0, performing IFFT, performing Ds1 times downsampling, and performing FFT processing to obtain a final result with the length of N IFFT 1 are equivalent to the above result by performing cyclic shift processing of the preset number of points, and the two sequences are defined as one sequence multiplied by a certain constant to obtain the other sequence.
By the cyclic shift method, phase adjustment in the prior art is avoided, calculation steps are simplified, and further operation complexity is reduced.
Optionally, in the method for detecting a RACH signal provided by the embodiment of the present application, acquiring a frequency domain signal of a PUSCH OFDM symbol includes: acquiring sampling data of a PUSCH OFDM symbol; carrying out CP (control point) removal processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; n for sampled data without CP PUSCH And carrying out FFT conversion on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
The sampled data of the PUSCH OFDM symbol is processed by CP, and then frequency shift adjustment can be carried out according to the requirement (1/2 SCS is required by the LTE system) PUSCH The NR system does not need to make frequency shift adjustments, then N PUSCH And carrying out FFT conversion on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
And the sampled data of the PUSCH OFDM symbol is converted into frequency domain information, so that the subcarriers of the contained RACH signal can be conveniently selected.
Optionally, in the method for detecting RACH signals provided in the embodiment of the present application, L on a subcarrier carrying RACH frequency domain signals is obtained according to a sequence with a length f ZC Data to obtain RACH signals, comprising: the Ds2 times down-sampling is carried out on the sequence with the length of gamma to obtain L2 data, wherein Ds2 is 1 to [ gamma/L ] ZC ]The largest positive integer divisible by r, L ZC The ZC sequence length used for RACH; FFT processing is performed on the L2 data to obtain L on the subcarriers carrying RACH frequency domain signals ZC Data.
Calculating the maximum multiple Ds2 of the second downsampling, wherein Ds2 is 1 to [ f/L ] ZC ]The largest positive integer divisible by f, and then Ds 2-fold downsampling the sequence of length f to obtain L2 data. FFT processing is carried out on the L2 data to obtain L on the subcarrier carrying RACH frequency domain signal ZC Data.
Ds2 downsampling is carried out on the sequence with the length of gamma, the number of data is reduced, and the effect of reducing the operation complexity is achieved.
Optionally, in the method for detecting a RACH signal provided in the embodiment of the present application, L1 is the number of the least subcarriers including the frequency band occupied by the RACH signal.
Optionally, in the method for detecting RACH signals provided by the embodiment of the present application, the value of f is obtained by using the following formula, where the formula is 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.
The method for detecting the RACH signal provided by the embodiment of the application obtains the frequency domain signal of the PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH The method comprises the steps of carrying out a first treatment on the surface of the 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 largest number of all positive integers that can be divided by CP1 and CP2 at the same time, CP1 and CP2 being the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH Ds1; supplementing 0 to the sequence with length L1 to obtain the sequence with length N IFFT 1, for a length of 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 to obtain a time domain signal corresponding to a sequence meeting preset requirements; sequentially cascading the time domain signals, supplementing 0 to the CP position of the time domain signals after the sequential cascading to obtain the 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; acquiring L on sub-carrier carrying RACH frequency domain signal according to sequence with length of gamma ZC The data is used for obtaining the RACH signal, and the problem that the operation complexity is high due to the fact that 256 complex multiplications are needed when the fixed length of 256 IFFT is adopted to adjust the phase is solved. The application adopts the minimum IFFT number N IFFT 1, and for the obtained length N IFFT 1, the phase modulation operation is avoided, and the effect of reducing the operation complexity is further achieved.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
The embodiment of the application also provides a device for detecting the RACH signal, and the device for detecting the RACH signal can be used for executing the method for detecting the RACH signal provided by the embodiment of the application. The RACH signal detection apparatus provided in the embodiment of the present application is described below.
Fig. 3 is a schematic diagram of a detection apparatus of RACH signal according to an embodiment of the present application. As shown in fig. 3, the apparatus includes: a first acquisition unit 301, a 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.
A first obtaining unit 301, configured to obtain a frequency domain signal of a PUSCH OFDM symbol, where a length of the PUSCH OFDM symbol is N PUSCH 。
The selecting 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, so as to form a sequence with a length of L1.
A calculating unit 303 for calculating the maximum downsampling 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 being the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH /Ds1。
A first processing unit 304 for supplementing 0 to the sequence with length L1 to obtain a sequence with length N IFFT 1, for a length of N IFFT 1, performing cyclic shift of preset points on the sequence to obtain a sequence meeting preset requirements;
a second processing unit 305 for performing N on the sequence meeting the preset requirement IFFT And (3) obtaining a time domain signal corresponding to the sequence meeting the preset requirement by 1-point IFFT.
And a third processing unit 306, configured to sequentially concatenate the time domain signals, and supplement 0 to the CP position of the time domain signal after the sequential concatenation, to obtain a processed time domain signal, and reserve the first f data in the processed time domain signal, to obtain a sequence with a length of f.
A second obtaining unit 307 for obtaining L on the sub-carrier carrying RACH frequency domain signal according to the sequence with length f ZC Data to obtain RACH signal, wherein L ZC The length of the ZC sequence used for RACH.
The detection device of RACH signals provided by the embodiment of the applicationAcquiring a frequency domain signal of a PUSCH OFDM symbol by a first acquisition unit 301; the selecting unit 302 selects values on L1 subcarriers from the frequency domain signal according to the target position in the RACH OFDM symbol, and forms a sequence with a length of L1; the calculation unit 303 calculates the maximum downsampling multiple Ds1 and the minimum IFFT number N IFFT 1, a step of; the first processing unit 304 complements 0 the sequence with length L1 to obtain a sequence with length N IFFT 1, for a length of N IFFT 1, performing cyclic shift of preset points on the sequence to obtain a sequence meeting preset requirements; the second processing unit 305 performs N on the sequence meeting the preset requirement IFFT 1-point IFFT to obtain a time domain signal corresponding to a sequence meeting preset requirements; the third processing unit 306 sequentially concatenates the time domain signals, supplements 0 at the CP position of the time domain signals after the sequential concatenation to obtain a processed time domain signal, and retains the first f data in the processed time domain signal to obtain a sequence with a length of f; the second acquisition unit 307 acquires L on the subcarrier carrying the RACH frequency domain signal according to the sequence of length f ZC The data is used for obtaining the RACH signal, and the problem that the operation complexity is high due to the fact that 256 complex multiplications are needed when the fixed length of 256 IFFT is adopted to adjust the phase is solved. The application adopts the minimum IFFT number N IFFT 1, and for the obtained length N IFFT 1, the phase modulation operation is avoided, and the effect of reducing the operation complexity is further achieved.
Optionally, in the apparatus for detecting a RACH signal provided in the embodiment of the present application, 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 be 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; a judging module for judging when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, then the length is N IFFT 1 is a sequence meeting the preset requirement, wherein two sequences are defined as one sequence being multiplied by a certain constant to obtain the other sequence.
Optionally, in the apparatus for detecting a RACH signal provided in the embodiment of the present application, the first acquisition unit includes: an acquisition module, configured to acquire sampling data of a PUSCH OFDM symbol; a fourth processing module, configured to perform CP removal processing on the sampled data of the PUSCH OFDM symbol, to obtain sampled data without CP; a fifth processing module for performing N on the sampled data without CP PUSCH And carrying out FFT conversion on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Optionally, in the apparatus for detecting a RACH signal provided in the embodiment of the present application, the second acquisition unit includes: a second sampling module for performing Ds2 times downsampling on the sequence with the length of f to obtain L2 data, wherein Ds2 is 1 to [ f/L ] Z C]The largest positive integer divisible by r, L ZC The ZC sequence length used for RACH; FFT processing is performed on the L2 data to obtain L on the subcarriers carrying RACH frequency domain signals ZC Data.
Optionally, in the apparatus for detecting a RACH signal provided in the embodiment of the present application, L1 is the number of the least subcarriers including the frequency band occupied by the RACH signal.
Optionally, in the RACH signal detection apparatus provided in the embodiment of the present application, the value of f is obtained using the following formula, where the formula is 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.
The RACH signal detection apparatus includes a processor and a memory, and the first acquiring unit 301, the selecting unit 302, the calculating unit 303, the first processing unit 304, the second processing unit 305, the third processing unit 306, and the second acquiring unit 307. And the like are stored in the memory as program elements, which are executed by the processor to perform the corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel may be provided with one or more, and detection of the RACH signal is achieved by adjusting the kernel parameters.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
An embodiment of the present application provides a storage medium having stored thereon a program which, when executed by a processor, implements the method of detecting a RACH signal.
The embodiment of the invention provides a processor which is used for running a program, wherein the program runs to execute the method for detecting the RACH signal.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the program: acquiring a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH The method comprises the steps of carrying out a first treatment on the surface of the 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 largest number of all positive integers that can be divided by CP1 and CP2 at the same time, CP1 and CP2 being the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH Ds1; supplementing 0 to the sequence with length L1 to obtain the sequence with length N IFFT 1, for a length of 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 to obtain a time domain signal corresponding to a sequence meeting preset requirements; sequentially concatenating the time domain signals and the time domain signals after the sequential concatenating Supplementing 0 to the CP position to obtain a processed time domain signal, and reserving the front f data in the processed time domain signal to obtain a sequence with the length of f; acquiring L on sub-carrier carrying RACH frequency domain signal according to sequence with length of gamma ZC Data to obtain RACH signal, wherein L ZC The length of the ZC sequence used for RACH.
Optionally, the sequence of length L1 is complemented with 0 to obtain a sequence of length N IFFT 1, for a length of N IFFT 1 to obtain a sequence meeting 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 (inverse fast Fourier transform) 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; carrying out FFT processing on the sampling data to obtain a frequency domain sequence corresponding to the sampling data; when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, then the length is N IFFT 1 is a sequence meeting the preset requirement, wherein two sequences are defined as one sequence being multiplied by a certain constant to obtain the other sequence.
Optionally, acquiring the frequency domain signal of the PUSCH OFDM symbol includes: acquiring sampling data of a PUSCH OFDM symbol; carrying out CP (control point) removal processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; n for sampled data without CP PUSCH And carrying out FFT conversion on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Optionally, L on the subcarrier carrying RACH frequency domain signal is acquired according to a sequence of length f ZC Data to obtain RACH signals, comprising: the Ds2 times down-sampling is carried out on the sequence with the length of gamma to obtain L2 data, wherein Ds2 is 1 to [ gamma/L ] ZC ]The largest positive integer divisible by r, L ZC The ZC sequence length used for RACH; FFT processing is performed on the L2 data to obtain L on the subcarriers carrying RACH frequency domain signals ZC Data.
Alternatively, L1 is the number of the minimum subcarriers containing the occupied frequency band of the RACH signal.
Alternatively, the value of f 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. The device herein may be a server, PC, PAD, cell phone, etc.
The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with the method steps of: acquiring a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH The method comprises the steps of carrying out a first treatment on the surface of the 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 largest number of all positive integers that can be divided by CP1 and CP2 at the same time, CP1 and CP2 being the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH Ds1; supplementing 0 to the sequence with length L1 to obtain the sequence with length N IFFT 1, for a length of 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 to obtain a time domain signal corresponding to a sequence meeting preset requirements; sequentially cascading the time domain signals, supplementing 0 to the CP position of the time domain signals after the sequential cascading to obtain the 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; acquiring L on sub-carrier carrying RACH frequency domain signal according to sequence with length of gamma ZC Data to obtain RACH signal, wherein L ZC The length of the ZC sequence used for RACH.
Optionally, the sequence of length L1 is complemented with 0 to obtain a sequence of length N IFFT 1, for a length of N IFFT 1 to obtain a sequence meeting 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 (inverse fast Fourier transform) 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; carrying out FFT processing on the sampling data to obtain a frequency domain sequence corresponding to the sampling data; when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, then the length is N IFFT 1 is a sequence meeting the preset requirement, wherein two sequences are defined as one sequence being multiplied by a certain constant to obtain the other sequence.
Optionally, acquiring the frequency domain signal of the PUSCH OFDM symbol includes: acquiring sampling data of a PUSCH OFDM symbol; carrying out CP (control point) removal processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; n for sampled data without CP PUSCH And carrying out FFT conversion on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Optionally, L on the subcarrier carrying RACH frequency domain signal is acquired according to a sequence of length f ZC Data to obtain RACH signals, comprising: the Ds2 times down-sampling is carried out on the sequence with the length of gamma to obtain L2 data, wherein Ds2 is 1 to [ gamma/L ] ZC ]The largest positive integer divisible by r, L ZC The ZC sequence length used for RACH; FFT processing is performed on the L2 data to obtain L on the subcarriers carrying RACH frequency domain signals ZC Data.
Alternatively, L1 is the number of the minimum subcarriers containing the occupied frequency band of the RACH signal.
Alternatively, the value of f 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.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer 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 Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in 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.
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Denomination of invention: Detection methods and devices for RACH signals

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