CN115412214A - RACH signal detection method and device - Google Patents

RACH signal detection method and device Download PDF

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CN115412214A
CN115412214A CN202111605303.2A CN202111605303A CN115412214A CN 115412214 A CN115412214 A CN 115412214A CN 202111605303 A CN202111605303 A CN 202111605303A CN 115412214 A CN115412214 A CN 115412214A
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sequence
length
ifft
rach
frequency domain
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CN115412214B (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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    • 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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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 the PUSCHOFDM symbol; selecting numerical values on L1 subcarriers from the frequency domain signals according to the target frequency domain position of the RACH signals in the RACH OFDM symbols to form a sequence with the length of L1; post-complementing 0 to the sequence with the length of L1 to obtain the sequence with the length of N IFFT 1; making N for the sequence meeting the preset requirement IFFT 1, obtaining a time domain signal corresponding to a sequence meeting a preset requirement by IFFT; sequentially cascading time domain signals, performing 0 complementing at the position of a CP (program code) of the sequentially cascaded time domain signals, reserving middle and front gamma data to obtain a sequence with the length of gamma, and acquiring L on a subcarrier carrying the RACH (random Access channel) frequency domain signal ZC And obtaining the RACH signal. Through the application, the problem of operation complexity comparison in the related technology is solvedHigh problems.

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 an apparatus for detecting an RACH signal.
Background
In a Long Term Evolution (LTE) system, after a User Equipment (UE) is turned on, downlink Synchronization is first performed through a Synchronization Channel (SCH), and a reception start point and a cell number of a radio frame and a subframe are found; then, system information is obtained through a Broadcast Channel (BCH), and the system information includes configuration information of a Random Access Channel (RACH); and finally, performing uplink synchronization through the RACH to finish the work of the access system. As shown in fig. 1, the conventional RACH detection technique uses an IFFT (inverse fast fourier transform) with a fixed length of 256, and requires 256 complex multiplications for phase adjustment, which is a processing method with high computational complexity.
In the related art, an IFFT with a fixed length of 256 is adopted for detecting a RACH signal, and 256 complex multiplications are required to be performed when adjusting a phase, which results in a problem of high computational complexity.
Disclosure of Invention
The main objective of the present application is to provide a method and an apparatus for detecting a RACH signal, so as to solve the problem of relatively high computation complexity caused by the fact that 256 complex multiplications are required to be performed when adjusting a phase by using an IFFT with a fixed length of 256 when detecting a RACH signal in the related art.
In order to achieve the above object, according to an aspect of the present application, a method for detecting a RACH signal is provided. The method comprises the following steps: obtaining a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH (ii) a Selecting values on L1 subcarriers from the frequency domain signal according to a target position in an RACH OFDM symbol to form a sequence with the length of L1; calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1, wherein Ds1 is
Figure BDA0003433488050000011
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N IFFT 1＝N PUSCH (Ds 1); to pairThe sequence with the length of L1 is supplemented with 0 to obtain the sequence with the length of N IFFT 1 for said length N IFFT 1, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements; making N for the sequence meeting the preset requirement IFFT Performing IFFT at 1 point to obtain a time domain signal corresponding to the sequence meeting the preset requirement; sequentially cascading the time domain signals, performing 0 complementing on the positions of the CP of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving front gamma data in the processed time domain signals to obtain a sequence with the length of gamma; obtaining L on the subcarrier carrying the RACH frequency domain signal according to the sequence with the length of Gamma ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
Further, the sequence with the length of L1 is supplemented with 0 to obtain the sequence with the length of N IFFT 1 for said length N IFFT 1, performing cyclic shift of preset points to obtain a sequence meeting preset requirements, including: setting the numerical values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to be 0 to obtain a processed frequency domain signal; performing IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal; performing Ds 1-time down-sampling 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, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is 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 removing processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; n is carried out on the sampling data without the CP PUSCH And performing FFT (fast Fourier transform) of points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Further, according to the sequence with the length of Gamma, L on the subcarrier carrying the RACH frequency domain signal is obtained ZC Data to obtain a RACH signal, comprising: performing Ds 2-time down-sampling on the sequence with the length of Gamma to obtain L2 data, wherein Ds2 is
Figure BDA0003433488050000022
The largest positive integer which can be divided exactly by f, lzc is the ZC sequence length used for RACH; performing FFT processing on the L2 data to acquire L on a subcarrier carrying RACH frequency domain signals ZC And (4) data.
Further, L1 is the number of the minimum subcarriers including the frequency band occupied by the RACH signal.
Further, 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 sub-carrier spacing, SCS, in the PUSCH OFDM symbol 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 an apparatus for detecting a RACH signal. The device includes: 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 (ii) a A selecting unit, configured to select, according to a target position in an RACH OFDM symbol, a value on L1 subcarriers from the frequency domain signal 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 is
Figure BDA0003433488050000021
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N IFFT 1＝N PUSCH (Ds 1); a first processing unit, configured to complement 0 to the sequence with length L1 to obtain a sequence with length N IFFT 1 for said length N IFFT 1, performing cyclic shift of preset number to obtainSequences meeting preset requirements; a second processing unit for performing N operation on the sequence meeting the preset requirement IFFT Performing IFFT at 1 point to obtain a time domain signal corresponding to the sequence meeting the preset requirement; the third processing unit is used for sequentially cascading the time domain signals, performing 0 complementing on the positions of the CP of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving the front gamma data in the processed time domain signals to obtain a sequence with the length of gamma; a second obtaining unit, configured to obtain L on a subcarrier carrying the RACH frequency domain signal according to the sequence with the length of r ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
Further, the first processing unit includes: the first processing module is configured to set the values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to 0, so as to obtain a processed frequency domain signal; the second processing module is used for carrying out 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 used for carrying out Ds 1-time down-sampling 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 if the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is multiplied by a certain constant to obtain the other sequence.
Further, the first acquisition unit includes: an obtaining module, configured to obtain sample data of the PUSCH OFDM symbol; the fourth processing module is used for performing CP removing 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 sample data without CP PUSCH And performing FFT (fast Fourier transform) of points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Further, the second acquisition unit includes: second sampling modeA block for performing Ds 2-fold down-sampling on the sequence with length of f to obtain L2 data, wherein Ds2 is
Figure BDA0003433488050000031
The largest positive integer, L, which can be divided exactly by F ZC A ZC sequence length used for RACH; a sixth processing module, configured to perform FFT on the L2 data to obtain L on a subcarrier carrying the RACH frequency domain signal ZC And (4) data.
Further, L1 is the number of the minimum subcarriers including the frequency band occupied by the RACH signal.
Further, the value of Γ is obtained using the following formula, where Γ = N PUSCH ×(SCS PUSCH /SCS RACH )/D s 1，SCS PUSCH Is the sub-carrier spacing, SCS, in the PUSCH OFDM symbol 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 described in 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 is executed to perform the RACH signal detection method.
According to the method, the frequency domain signal of the PUSCH OFDM symbol is obtained by adopting the following steps, wherein the length of the PUSCH OFDM symbol is N PUSCH (ii) a Selecting values on L1 subcarriers from the frequency domain signal according to a target position in an RACH OFDM symbol to form a sequence with the length of L1; calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1, wherein Ds1 is
Figure BDA0003433488050000041
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, wherein CP1 and CP2 are the CP length of PUSCH OFDM symbol, N IFFT 1＝N PUSCH (Ds 1); complementing 0 for 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, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements; making N for the sequence meeting the preset requirement IFFT 1, obtaining a time domain signal corresponding to a sequence meeting a preset requirement by IFFT; sequentially cascading time domain signals, performing 0 complementing on the positions of CP (content provider) of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving front gamma data in the processed time domain signals to obtain a sequence with the length of gamma; acquiring L on a subcarrier carrying a RACH frequency domain signal according to a sequence with the length of Gamma ZC The method and the device can obtain the RACH signal, and solve the problem that 256 complex multiplications are needed when the phase is adjusted by adopting IFFT with the fixed length of 256 when the RACH signal is detected in the related technology, so that the operation complexity is high. The application adopts the minimum IFFT number N IFFT 1 and for the obtained length N IFFT The sequence of 1 is circularly shifted, so that the phase modulation operation is avoided, and the effect of reducing the complexity of operation is further achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit 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 detection method of a RACH signal provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a detection apparatus for a RACH signal provided in an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Moreover, 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, some terms or expressions referred to in the embodiments of the present application are explained below:
RACH: random Access Channel;
PUSCH: physical Uplink Channel Uplink shared Physical Channel;
OFDM: orthogonal Frequency Division Multiplexing technology;
and (3) CP: the Cyclic Prefix is formed by copying a signal at the tail part of the OFDM symbol to the head part;
IFFT: inverse Fast Fourier Transform;
ZC sequence: the Zadoff-Chu sequence is a sequence transmitted from a communication signal, and LTE employs a ZC (Zadoff-Chu) sequence having constant amplitude zero Auto-Correlation (CAZAC) as a reference sequence of RACH.
The present invention is described below with reference to preferred implementation steps, and fig. 2 is a flowchart of a method for detecting a RACH signal according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:
step S101, a frequency domain signal of the PUSCH OFDM symbol is acquired.
In the random access process, if an RACH signal is transmitted, the RACH signal is mixed in a PUSCH OFDM symbol and transmitted together, 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 a frequency domain signal of the PUSCH OFDM symbol is obtained first.
Step S102, according to the target position in the RACH OFDM symbol, selecting the numerical value on L1 subcarrier from the frequency domain signal to form a sequence with the length of L1.
The position of the RACH signal within the RACH OFDM symbol is fixed, so values on L1 consecutive subcarriers can be selected according to the target position to form a sequence with a length of L1, where L1 is the minimum number of subcarriers that completely contain the RACH occupied band.
Step S103, calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1 wherein Ds1 is
Figure BDA0003433488050000051
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, wherein CP1 and CP2 are the CP length of PUSCH OFDM symbol, N IFFT 1＝N PUSCH /Ds1。
The maximum down-sampling multiple Ds1 is calculated. Ds1 is
Figure BDA0003433488050000061
The largest number of all positive integers that can be evenly divided by both CP1 and CP2. The minimum number of IFFT points is determined as N IFFT 1＝N PUSCH (Ds 1). There are at most two CP lengths of the PUSCH OFDM symbol, CP1 and CP2 respectively. The length is 2 in Normal mode, and the CP length is only 1 in Extended mode.
Step S104, complementing 0 to the sequence with the length L1 to obtain the sequence with the length N IFFT 1, to a length ofN IFFT 1, performing cyclic shift of preset points 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 be 0 to obtain a processed frequency domain signal; performing IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal; performing Ds 1-time down-sampling on the time domain signal to obtain sampling data; and carrying out FFT processing on the sampled data to obtain a frequency domain sequence corresponding to the sampled data. Post-complementing the sequence with the length of L1 to the length of N IFFT 1, for a length of N IFFT 1, performing cyclic shift of a preset number of points, so that the obtained result is equivalent to the frequency domain sequence corresponding to the sampling data. The two sequence equivalents are defined as: one of the sequences is multiplied by a constant to obtain the other sequence.
Step S105, making N for the sequence meeting the preset requirement IFFT And obtaining a time domain signal corresponding to the sequence meeting the preset requirement by the IFFT of 1 point.
Making N the sequence meeting the preset requirement obtained in the step S104 IFFT And obtaining a corresponding time domain signal by the IFFT of 1 point.
And S106, sequentially cascading the time domain signals, performing 0 complementing on the positions of the CP of the sequentially cascaded time domain signals to obtain the processed time domain signals, and reserving the front gamma data in the processed time domain signals to obtain a sequence with the length of gamma.
The time domain signals obtained in step S105 are sequentially concatenated, and the positions of the CPs in the time domain signals after the sequential concatenation are subjected to zero padding, because the CPs are removed when the PUSCH OFDM symbols are acquired, and then after the PUSCH OFDM symbols are correspondingly converted into the time domain signals, the positions of the original CPs are empty, so that 0 padding is performed. Pre-retention Γ = N PUSCH ×(SCS PUSCH /SCS RACH )/D s 1 piece of data.
Step S107, according to the sequence with the length of Gamma, L on the subcarrier carrying the RACH frequency domain signal is obtained ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
L on a subcarrier carrying RACH frequency domain signals can be obtained through a sequence with the length of r ZC After that, L can be further processed ZC The data is correlated with ZC sequence library to realize random access process.
In summary, the present application employs the minimum number of IFFT N IFFT 1 and for the resulting length N IFFT The sequence of 1 is circularly shifted, so that the phase modulation operation is avoided, and the effect of reducing the complexity of operation is further achieved.
Optionally, in the detection method of the RACH signal provided in the embodiment of the present application, a sequence with a length of L1 is complemented by 0 to obtain a sequence with a length of N IFFT 1, for a length of N IFFT 1, performing cyclic shift of preset points to obtain a sequence meeting preset requirements, including: setting the numerical values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to be 0 to obtain a processed frequency domain signal; performing IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal; performing Ds 1-time down-sampling on the time domain signal to obtain sampling data; carrying out FFT processing on the sampled data to obtain a frequency domain sequence corresponding to the sampled data; when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampled data, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is multiplied by a certain constant to obtain the other sequence.
Firstly, setting the numerical values of all subcarriers except selected L1 subcarriers of a frequency domain signal of a PUSCH OFDM symbol to be 0, then carrying out IFFT, carrying out Ds1 time down-sampling, and finally carrying out FFT processing to obtain a final result with the length of N IFFT The sequence 1 is equivalent to the above result by performing cyclic shift processing with a predetermined number of points, and the two sequences are equivalent to each other by defining that one sequence is multiplied by a 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 the complexity of operation is reduced.
Optionally, in the present applicationIn the method for detecting an RACH signal according to the embodiment, acquiring a frequency domain signal of a PUSCH OFDM symbol includes: acquiring sampling data of a PUSCH OFDM symbol; carrying out CP removing processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; n is carried out on sampling data without CP PUSCH And performing FFT (fast Fourier transform) on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
The sampled data of PUSCH OFDM symbol is processed by CP, and then frequency shift adjustment can be carried out according to the requirement (1/2 SCS is needed for LTE system) PUSCH The NR system does not need to do frequency shift adjustment), and then do N PUSCH And performing FFT (fast Fourier transform) on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
And converting the sampled data of the PUSCH OFDM symbol into frequency domain information so as to select the sub-carrier of the contained RACH signal.
Optionally, in the detection method for the RACH signal provided in the embodiment of the present application, L on a subcarrier carrying the RACH frequency domain signal is obtained according to a sequence having a length of Γ ZC Data to obtain a RACH signal, comprising: ds2 times down-sampling is carried out on a sequence with the length of Gamma to obtain L2 data, wherein Ds2 is 1 to [ Gamma/L ZC ]The largest positive integer, L, which can be divided exactly by F ZC A ZC sequence length used for RACH; FFT processing is carried out on the L2 data to obtain L on a subcarrier carrying RACH frequency domain signals ZC And (4) data.
Calculating the maximum multiple Ds2 of the second down-sampling, wherein the Ds2 is 1 to [ Gamma/L ZC ]The largest positive integer which can be divided exactly by f, and then Ds2 times down-sampling is performed on a sequence with length f to obtain L2 data. FFT processing is carried out on the L2 data to obtain L on the subcarrier carrying the RACH frequency domain signal ZC And (4) data.
Ds2 is subjected to the sample reduction on the sequence with the length of Gamma, the number of data is reduced, and the effect of reducing the operation complexity is further achieved.
Optionally, in the method for detecting a RACH signal provided in the embodiment of the present application, L1 is the number of minimum subcarriers including a frequency band occupied by the RACH signal.
Optionally, the RACH information provided in the embodiments of the present applicationIn the detection method of the sign, the value of the gamma is obtained by adopting the following formula, wherein the formula is gamma = N PUSCH ×(SCS PUSCH /SCS RACH )/D s 1，SCS PUSCH Is the subcarrier spacing, SCS, in the PUSCH OFDM symbol RACH Is the subcarrier spacing in the RACH OFDM symbol.
The method for detecting the RACH signal provided in the embodiment of the present application obtains a frequency domain signal of a PUSCH OFDM symbol, where the length of the PUSCH OFDM symbol is N PUSCH (ii) a Selecting values on L1 subcarriers from the frequency domain signal according to a target position in an RACH OFDM symbol to form a sequence with the length of L1; calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1, wherein Ds1 is
Figure BDA0003433488050000081
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, wherein CP1 and CP2 are the CP length of PUSCH OFDM symbol, N IFFT 1＝N PUSCH (Ds 1); complementing 0 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, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements; making N for the sequence meeting the preset requirement IFFT 1, obtaining a time domain signal corresponding to a sequence meeting a preset requirement by IFFT; sequentially cascading time domain signals, performing 0 complementing on the positions of CP (content provider) of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving front gamma data in the processed time domain signals to obtain a sequence with the length of gamma; acquiring L on a subcarrier carrying a RACH frequency domain signal according to a sequence with the length of Gamma ZC The method and the device can obtain the RACH signal, and solve the problem that 256 complex multiplications are needed when the phase is adjusted by adopting IFFT with the fixed length of 256 when the RACH signal is detected in the related technology, so that the operation complexity is high. The application adopts the minimum IFFT number N IFFT 1 and for the resulting length N IFFT The sequence of 1 is circularly shifted, so that the phase modulation operation is avoided, and the effect of reducing the complexity of operation 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 different than presented herein.
The embodiment of the present application further provides a device for detecting a RACH signal, and it should be noted that the device for detecting a RACH signal according to the embodiment of the present application may be used to execute the method for detecting a RACH signal according to the embodiment of the present application. The following describes an apparatus for detecting a RACH signal according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a detection apparatus for a RACH signal according to an embodiment of the present application. As shown in fig. 3, the apparatus includes: a first acquiring unit 301, a selecting unit 302, a calculating unit 303, a first processing unit 304, a second processing unit 305, a third processing unit 306 and a second acquiring unit 307.
A first obtaining unit 301, configured to obtain a frequency domain signal of a PUSCH OFDM symbol, where the length of the PUSCH OFDM symbol is N PUSCH 。
A selecting unit 302, configured to select values on L1 subcarriers from the frequency domain signal according to a target location in the RACH OFDM symbol, so as to form a sequence with a length of L1.
A calculating unit 303, configured to calculate a maximum down-sampling multiple Ds1 and a minimum IFFT number N IFFT 1, wherein Ds1 is
Figure BDA0003433488050000091
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, wherein CP1 and CP2 are the CP length of PUSCH OFDM symbol, N IFFT 1＝N PUSCH /Ds1。
A first processing unit 304, configured to complement 0 to a sequence with a length of L1 to obtain a length of N IFFT 1, for a length of N IFFT 1, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements;
a second processing unit 305 for performing N operations on the sequences meeting the preset requirements IFFT An IFFT of 1-point is performed,and obtaining a time domain signal corresponding to the sequence meeting the preset requirement.
The third processing unit 306 is configured to cascade the time domain signals sequentially, perform 0 filling at the position of the CP of the time domain signals after the sequential cascading to obtain processed time domain signals, and reserve the first Γ data in the processed time domain signals to obtain a sequence with a length of Γ.
A second obtaining unit 307, configured to obtain L on a subcarrier carrying the RACH frequency domain signal according to a sequence with a length of r ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
In the detection apparatus for the RACH signal provided in the embodiment of the present application, a first obtaining unit 301 obtains a frequency domain signal of a PUSCH OFDM symbol; the selecting unit 302 selects 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; the calculating unit 303 calculates the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1; the first processing unit 304 complements 0 to the sequence with length L1 to obtain length N IFFT 1, for a length of N IFFT 1, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements; the second processing unit 305 performs N on the sequences meeting the preset requirements IFFT 1, obtaining a time domain signal corresponding to a sequence meeting a preset requirement by IFFT; the third processing unit 306 sequentially cascades the time domain signals, performs 0 complementing on the sequentially cascaded CP positions of the time domain signals to obtain processed time domain signals, and retains the front f data in the processed time domain signals to obtain a sequence with length f; the second obtaining unit 307 obtains L on the subcarrier carrying the RACH frequency domain signal according to the sequence with length f ZC The method and the device for detecting the RACH signal solve the problem that in the related technology, when the RACH signal is detected, IFFT with the fixed length being 256 is adopted, and when the phase is adjusted, 256 complex multiplications are needed, so that the operation complexity is high. The application adopts the minimum IFFT number N IFFT 1 and for the resulting length N IFFT 1, the sequence is circularly shifted, thereby avoiding phase modulation operation and further reducing the complexity of operationThe effect of the degree.
Optionally, in the apparatus for detecting a RACH signal provided in an embodiment of the present application, the first processing unit includes: the first processing module is used for setting the numerical values 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 carrying out 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 used for carrying out Ds 1-time down-sampling 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 whether the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampled data, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is multiplied by a certain constant to obtain the other sequence.
Optionally, in the apparatus for detecting a RACH signal provided in an embodiment of the present application, the first obtaining unit includes: the acquisition module is used for acquiring the sampling data of the PUSCH OFDM symbol; the fourth processing module is used for performing CP removing processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; a fifth processing module for N-processing the sampled data without CP PUSCH And performing FFT (fast Fourier transform) 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 an embodiment of the present application, the second obtaining unit includes: a second sampling module, configured to perform Ds 2-fold down-sampling on a sequence with a length of r to obtain L2 data, where Ds2 is 1 [ r/L ] Z C]The largest positive integer, L, which can be divided exactly by F ZC A ZC sequence length used for RACH; FFT processing is carried out on the L2 data to obtain L on a subcarrier carrying RACH frequency domain signals ZC And (4) data.
Optionally, in the apparatus for detecting a RACH signal provided in the embodiment of the present application, L1 is the number of minimum subcarriers including a frequency band occupied by the RACH signal.
Optionally, provided in the embodiments of the present applicationIn the detecting device of the supplied RACH signal, the following formula is adopted to obtain the value of Gamma, wherein, the formula is Gamma = N PUSCH ×(SCS PUSCH /SCS RACH )/D s 1，SCS PUSCH Is the subcarrier spacing, SCS, in the PUSCH OFDM symbol RACH Is the subcarrier spacing in the RACH OFDM symbol.
The apparatus for detecting RACH signal includes a processor and a memory, and the aforementioned first acquiring unit 301, selecting unit 302, calculating unit 303, first processing unit 304, second processing unit 305, third processing unit 306 and second acquiring unit 307. Etc. are stored in the memory as program elements which are executed by the processor to perform the respective functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can set one or more, and the detection of the RACH signal is realized by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), including at least one memory chip.
An embodiment of the present invention provides a storage medium on which a program is stored, which, when executed by a processor, implements the RACH signal detection method.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program executes the detection method of the RACH signal during running.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: obtaining a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH (ii) a Selecting values on L1 subcarriers from the frequency domain signal according to a target position in an RACH OFDM symbol to form a sequence with the length of L1; calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1, wherein Ds1 is
Figure BDA0003433488050000111
Is the maximum number of all positive integers which can be simultaneously and evenly divided by CP1 and CP2, wherein CP1 and CP2 are the CP length of PUSCH OFDM symbol, N IFFT 1＝N PUSCH (Ds 1); complementing 0 for 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, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements; making N for the sequence meeting the preset requirement IFFT 1, obtaining a time domain signal corresponding to a sequence meeting a preset requirement by IFFT; sequentially cascading time domain signals, performing 0 complementing on the positions of CP (content provider) of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving front gamma data in the processed time domain signals to obtain a sequence with the length of gamma; acquiring L on a subcarrier carrying a RACH frequency domain signal according to a sequence with the length of Gamma ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
Optionally, 0 is complemented for the sequence with length L1 to obtain length N IFFT 1, for a length of N IFFT 1, performing cyclic shift of preset points to obtain a sequence meeting preset requirements, including: setting the numerical values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to be 0 to obtain a processed frequency domain signal; performing IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal; performing Ds 1-time down-sampling on the time domain signal to obtain sampling data; carrying out FFT processing on the sampled data to obtain a frequency domain sequence corresponding to the sampled data; when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampled data, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is multiplied by a certain constant to obtain the other sequence.
Optionally, the obtaining a frequency domain signal of a PUSCH OFDM symbol includes: acquiring sampling data of a PUSCH OFDM symbol; the sampled data of the PUSCH OFDM symbol is subjected to CP removing processing to obtain the non-CPSampling data with CP; n is carried out on sampling data without CP PUSCH And performing FFT (fast Fourier transform) on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Optionally, L on a subcarrier carrying a RACH frequency domain signal is acquired in terms of a sequence of length f ZC Data to obtain a RACH signal, comprising: performing Ds 2-fold downsampling on a sequence with the length of gamma to obtain L2 data, wherein Ds2 is 1 to [ gamma/L ZC ]The largest positive integer, L, which can be divided exactly by F ZC A ZC sequence length used for RACH; FFT processing is carried out on the L2 data to obtain L on a subcarrier carrying RACH frequency domain signals ZC And (4) data.
Optionally, L1 is the number of the minimum subcarriers containing the frequency band occupied by the RACH signal.
Optionally, 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, SCS, in the PUSCH OFDM symbol RACH Is the subcarrier spacing in the RACH OFDM symbol. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: obtaining a frequency domain signal of a PUSCH OFDM symbol, wherein the length of the PUSCH OFDM symbol is N PUSCH (ii) a Selecting values on L1 subcarriers from the frequency domain signal according to a target position in an RACH OFDM symbol to form a sequence with the length of L1; calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1, wherein Ds1 is
Figure BDA0003433488050000121
Is the maximum number of all positive integers which can be simultaneously divided by CP1 and CP2, CP1 and CP2 are the CP length of PUSCH OFDM symbol, N IFFT 1＝N PUSCH (Ds 1); complementing 0 for 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, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements; opposite signSynthesizing the sequence with the preset requirement as N IFFT 1, obtaining a time domain signal corresponding to a sequence meeting a preset requirement by IFFT; sequentially cascading time domain signals, performing 0 complementing on the positions of CP (content provider) of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving front gamma data in the processed time domain signals to obtain a sequence with the length of gamma; acquiring L on a subcarrier carrying a RACH frequency domain signal according to a sequence with the length of Gamma ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
Optionally, 0 is supplemented 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, including: setting the numerical values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to be 0 to obtain a processed frequency domain signal; performing IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal; performing Ds1 time down-sampling on the time domain signal to obtain sampling data; carrying out FFT processing on the sampled data to obtain a frequency domain sequence corresponding to the sampled data; when the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampled data, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is multiplied by a certain constant to obtain the other sequence.
Optionally, obtaining a frequency domain signal of the PUSCH OFDM symbol includes: acquiring sampling data of a PUSCH OFDM symbol; performing CP removing processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP; n is carried out on sampling data without CP PUSCH And performing FFT (fast Fourier transform) on the points to obtain a frequency domain signal of the PUSCH OFDM symbol.
Optionally, L on a subcarrier carrying a RACH frequency domain signal is acquired in terms of a sequence of length f ZC Data to obtain a RACH signal, comprising: ds2 times down-sampling is carried out on a sequence with the length of Gamma to obtain L2 data, wherein Ds2 is 1 to [ Gamma/L ZC ]The largest positive integer, L, which can be divided exactly by F ZC Used for RACHLength of ZC sequence; FFT processing is carried out on the L2 data to obtain L on a subcarrier carrying RACH frequency domain signals ZC And (4) data.
Optionally, L1 is the number of the minimum subcarriers containing the frequency band occupied by the RACH signal.
Optionally, 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, SCS, in the PUSCH OFDM symbol RACH Is the subcarrier spacing in the RACH OFDM symbol.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The 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 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 Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, 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 so forth) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims (10)

1. A method for detecting a RACH signal, comprising:
obtaining 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 a target position in an RACH OFDM symbol to form a sequence with the length of L1;
calculating the maximum down-sampling multiple Ds1 and the minimum IFFT number N IFFT 1, wherein Ds1 is
Figure FDA0003433488040000011
Can be evenly divided by CP1 and CP2 simultaneouslyA large number, CP1 and CP2, is the CP length, N, of the PUSCH OFDM symbol IFFT 1＝N PUSCH /Ds1；
Complementing 0 to the sequence with the length of L1 to obtain the 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;
making N for the sequence meeting the preset requirement IFFT Performing IFFT at 1 point to obtain a time domain signal corresponding to the sequence meeting the preset requirement;
sequentially cascading the time domain signals, performing 0 complementing on the positions of the CP of the time domain signals after sequential cascading to obtain processed time domain signals, and reserving front gamma data in the processed time domain signals to obtain a sequence with the length of gamma;
obtaining L on the subcarrier carrying the RACH frequency domain signal according to the sequence with the length of Gamma ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
2. The method of claim 1, wherein the length-L1 sequence is complemented by 0 to obtain a length-N sequence IFFT 1 for said length N IFFT 1, performing cyclic shift of preset points to obtain a sequence meeting preset requirements, including:
setting the numerical values of all subcarriers except the selected L1 subcarriers in the frequency domain signal to be 0 to obtain a processed frequency domain signal;
performing IFFT processing on the processed frequency domain signal to obtain a time domain signal corresponding to the processed frequency domain signal;
performing Ds 1-time down-sampling 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, the length is N IFFT 1 is in accordance with the presetThe claimed sequence, wherein two sequences are equivalent is defined as one of the sequences multiplied by a constant to yield the other sequence.
3. 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 removing processing on the sampled data of the PUSCH OFDM symbol to obtain sampled data without CP;
n is carried out on the sampling data without the CP PUSCH And performing FFT (fast Fourier transform) of points to obtain a frequency domain signal of the PUSCH OFDM symbol.
4. Method according to claim 1, characterized in that L on the subcarriers carrying the RACH frequency domain signals is obtained depending on said sequence of length f ZC Data to obtain a RACH signal, comprising:
performing Ds 2-time down-sampling on the sequence with the length of Gamma to obtain L2 data, wherein Ds2 is 1 &
Figure FDA0003433488040000021
The largest positive integer, L, which can be divided exactly by F zc A ZC sequence length used for RACH;
performing FFT processing on the L2 data to acquire L on a subcarrier carrying RACH frequency domain signals ZC And (4) data.
5. The method of claim 1 wherein L1 is the number of the least subcarriers comprising the frequency band occupied by the RACH signal.
6. Method according to claim 1, characterized in that the value of Γ is obtained with the following formula, where Γ = N PUSCH ×(SCS PUSCH /SCS RACH )/D s 1，SCS PUSCH Is the sub-carrier spacing, SCS, in the PUSCH OFDM symbol RACH Is as followsThe subcarrier spacing in the RACH OFDM symbol.
7. An apparatus for detecting a RACH signal, 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, according to a target position in an RACH OFDM symbol, a value on L1 subcarriers from the frequency domain signal 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 is
Figure FDA0003433488040000022
Is the maximum number capable of being simultaneously divided by CP1 and CP2 in all the positive integers, CP1 and CP2 are the CP length of the PUSCH OFDM symbol, N IFFT 1＝N PUSCH /Ds1；
A first processing unit, configured to complement 0 to the sequence with length L1 to obtain a sequence with length N IFFT 1 for said length N IFFT 1, performing cyclic shift of a preset number of points to obtain a sequence meeting preset requirements;
a second processing unit for performing N operation on the sequence meeting the preset requirement IFFT Performing IFFT at 1 point to obtain a time domain signal corresponding to the sequence meeting the preset requirement;
the third processing unit is used for sequentially cascading the time domain signals, performing 0 complementing at the position of a CP (program code) of the sequentially cascaded time domain signals to obtain processed time domain signals, and reserving a front gamma number of data in the processed time domain signals to obtain a sequence with the length of gamma;
a second obtaining unit, configured to obtain L on a subcarrier carrying the RACH frequency domain signal according to the sequence with the length of r ZC Data to obtain RACH signal, wherein L ZC Length of ZC sequence used for RACH.
8. The apparatus of claim 7, wherein the first processing unit comprises:
the first processing module is used for setting the numerical values 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 carrying out 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 used for carrying out Ds 1-time down-sampling 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 if the length is N IFFT 1 is equivalent to the frequency domain sequence corresponding to the sampling data, the length is N IFFT 1 is a sequence meeting the preset requirement, wherein, the equivalence of two sequences is defined as that one sequence is multiplied by a certain constant to obtain the other sequence.
9. A computer-readable storage medium characterized in that the storage medium stores a program, wherein the program executes the RACH signal detection method of any one of claims 1 to 6.
10. A processor, characterized in that the processor is configured to execute a program, wherein the program is executed to execute the RACH signal detection method according to any one of claims 1 to 6.
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