CN109639615B - Low-delay 5G baseband signal generation method - Google Patents

Low-delay 5G baseband signal generation method Download PDF

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CN109639615B
CN109639615B CN201811491616.8A CN201811491616A CN109639615B CN 109639615 B CN109639615 B CN 109639615B CN 201811491616 A CN201811491616 A CN 201811491616A CN 109639615 B CN109639615 B CN 109639615B
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CN109639615A (en
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徐兰天
刘祖深
凌云志
张煜
袁行猛
许虎
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CLP Kesiyi Technology Co Ltd
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CETC 41 Institute
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    • 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
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
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    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
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Abstract

The invention discloses a low-delay 5G baseband signal generation method, and particularly relates to the technical field of wireless communication. The low-delay 5G baseband signal generation method adopts a low-delay 5G baseband signal generation device which comprises a system synchronization module, a preprocessing module, an IFFT module, a CP adding module, a rate matching module, a frequency spectrum shifting module and a synchronization merging module, wherein system parameters of a 5G system enter the system synchronization module to provide parameters for the preprocessing module, the CP adding module, the rate matching module, the frequency spectrum shifting module and the synchronization merging module; the CP direct output preprocessing technology and the time domain rate matching technology are adopted, and the time domain rate matching technology is adopted to greatly reduce the baseband processing time delay.

Description

Low-delay 5G baseband signal generation method
Technical Field
The invention relates to the technical field of wireless communication, in particular to a low-delay 5G baseband signal generation method.
Background
Mobile communication network technology has experienced 2G, 3G and 4G through explosive growth for many years, with a ten-year development cycle for each generation. Although mobile communication technology has been developed and updated for 30 years, the data transmission rate has been greatly improved compared with the first generation mobile communication system, but currently, in the 21 st century, which is the explosion of data transmission, mobile communication service still faces a great challenge. Therefore, it is a current development trend to research key technologies related to 5G mobile communication, and 5G will replace 3G and 4G in the near future to become a new generation of mobile communication technology. On 14 th 6 th 2018, the fifth generation mobile communication technology standard (5G NR) independent networking (SA, standard) function is formally frozen at TSG RAN congress (TSG #80) at the 80 th time of 3 GPP. In addition to the completed early version of 5G Release15 with non-standalone Networking (NSA) architecture, 5G has already completed the first stage full function standardization work, and entered the new stage of industry full sprint.
The first 5G release standard focuses on defining a new air gap (NR). Previously, the development of new generation radio base stations has focused on the introduction of new modulation and coding schemes, but the emphasis of 5G has been on how to flexibly support terminals and services of very different characteristics, different types of deployments, and multi-band distribution from less than 1GHz to millimeter wave. Compared with the LTE of 4G, the baseband signal generation increases two key parameters, one is BWP number B, and the other is subcarrier configuration parameter ui(i ═ 1,2,. B), both of which are high-level configuration parameters. BWP reasonably utilizes frequency domain resource, subcarrier configuration parameter muiThe bandwidth of the subcarriers is flexibly configured, and the flexibility of the 5G NR is enhanced, so that the requirements of different application scenes are met. However, in implementation, the IFFT implementation method of 4G LTE cannot be directly implemented, and since the subcarrier configuration parameters on different BWPs may be different, when implementing parallel IFFT, the corresponding data rates are different. The current general solution is as follows: the first is a method for realizing frequency domain interpolation, according to the sub-carrier configuration parameter mu of the iBWPiDirectly inserting zeros in a frequency domain, then performing IFFT and CP addition on each BWP respectively, and finally combining and outputting all the BWPs to finish the generation of baseband signals; the second is the time domain interpolation method, each BWP first carries on IFFT and adds CP separately, then according to the subcarrier configuration parameter mu of the ith BWPiAnd performing interpolation on a time domain, and finally combining and outputting all BWPs to finish the generation of baseband signals. The first method has the disadvantages that: according to the latest 3GPP R15 protocol, the IFFT length is
Figure GDA0003020424570000011
Where κ is 64, the maximum length of IFFT in the first method is 131037, and different μi(0-4) the lengths are different, so that the complexity of implementation is increased; meanwhile, when different BWPs are merged, the IFFT and CP addition of all BWPs need to be completed, which results in a large delay, especially for BWPs with the smallest IFFT length. The second method has the disadvantages that: according to the latest 3GPP R15 protocol, due to different mui(0-4) symbol times are different, maximum symbol timeThe time is about 71.43us (mu)i0) and the minimum symbol time is 4.46us (μ)i4), different BWPs are merged after CP is added, the symbol with the shortest time can be merged and output until the time domain interpolation of the symbol with the longest time is finished, and a delay of 1 time of the symbol with the shortest time is generated.
Disclosure of Invention
The invention aims to provide a 5G baseband signal generation method for greatly reducing baseband processing time delay by adopting a time domain rate matching technology aiming at the defect of high time delay caused by the existing method for realizing CP-OFDM modulation of a 5G system by adopting frequency domain interpolation and time domain interpolation.
The invention specifically adopts the following technical scheme:
a low-delay 5G baseband signal generating method comprises a system synchronization module, a preprocessing module, an IFFT module, a CP adding module, a rate matching module, a frequency spectrum shifting module and a synchronization merging module, wherein system parameters of a 5G system enter the system synchronization module to provide parameters for the preprocessing module, the CP adding module, the rate matching module, the frequency spectrum shifting module and the synchronization merging module; the method is characterized in that a CP direct output preprocessing technology and a time domain rate matching technology are adopted, and the method specifically comprises the following steps:
step 1: determining configuration parameters of each processing unit according to system parameters transmitted by a high layer;
step 2: preprocessing the value of each BWP resource element;
and step 3: carrying out improved CP-OFDM processing on the preprocessed BWP data to realize the output of BWP symbol data, carrying out IFFT processing firstly, and after preprocessing, IFFT outputs CP firstly, thus directly outputting; secondly, the CP data is output firstly, after the IFFT output is finished, the CP is output in sequence, and the symbol data is output for the CP adding processing;
and 4, step 4: carrying out rate matching processing on BWP symbol data, realizing consistency of data output rate and system data output rate under different subcarrier space configuration parameters, eliminating crosstalk among BWPs, and realizing time domain interpolation according to an interpolation configuration parameter O, wherein the processing steps comprise 0 complementing and filtering;
and 5: carrying out spectrum moving processing on the data after the rate matching, and moving the BWP data to a corresponding spectrum position;
step 6: and performing synchronous combination processing on the data subjected to frequency spectrum shifting, synthesizing single-path data output, finishing the generation of a 5G baseband signal, and finishing the synchronous combination output of the signal by utilizing a frame synchronous signal, a subframe synchronous signal, a half subframe synchronous signal, a time slot synchronous signal and a symbol synchronous signal generated by a system synchronous generator.
Preferably, in step 1, the system parameters include a system bandwidth BD, BWP number B, and a subcarrier configuration parameter ui(i ═ 1, 2.. B), CP type C, configuration parameters of each processing unit, including IFFT length LIFFTPreprocessed CP length parameter LCPCenter position pst of rate-matched interpolation configuration parameter O, BWPBWP i(i＝1,2,...B)；
According to the bandwidth BD and the subcarrier configuration parameter u of the 5G signali(i ═ 1, 2.. B), the length L of the IFFT is determined by equation (1)ifftIs composed of
Lifft＝2N (1)
Wherein N satisfies
Figure GDA0003020424570000031
B, the minimum IFFT length is 4096 based on the 3GPP R15 protocol, and IFFT implementation consistency, taking N as 12, i.e. the length L of the IFFTifft4096;
configuring parameter u according to subcarrieri( i 1, 2.. B) determining a system data rate RsI.e. combining the output data rate RsExpressed by formula (2):
Rs＝Lifft·15·2max_u ksps (2)
wherein max _ u is a parameter u for configuring the system subcarrieriMaximum value of (i ═ 1, 2.. B), LifftIs the length of the IFFT;
determining the length of the CP according to the CP type C, i.e. normal CP or extended CP
Figure GDA00030204245700000310
Represented by formula (3):
Figure GDA0003020424570000032
wherein, i is 1, 2., B,
Figure GDA0003020424570000033
Figure GDA0003020424570000034
configuring parameter mu for sub-carriersiThe number of slots in the sub-frame below,
Figure GDA0003020424570000035
is the number of symbols on the slot, LifftIs the length of the IFFT;
according to the system parameter ui(i ═ 1, 2.. B), rate-matched interpolation configuration parameter O is determined using equation (4)iIs composed of
Figure GDA0003020424570000036
Where, i is 1, 2., B, max _ u, which is the system subcarrier configuration parameter uiA maximum value of (i ═ 1,2,. B);
data on each BWP resource element is expressed by equation (5)
Figure GDA0003020424570000037
Wherein, i is 1 to B, and is data after resource mapping.
Preferably, in step 2, the value of each BWP resource element is preprocessed, and the result of the preprocessing is represented by equation (6),
Figure GDA0003020424570000038
wherein, XiFor data on the ith BWP resource element, as a pre-processing parameter PM, the PM is expressed by equation (7),
Figure GDA0003020424570000039
wherein 1i is a complex unit.
Preferably, in step 3, the preprocessed BWP data is processed by modified CP-OFDM, and is first IFFT processed and output as formula (8)
Ii＝ifft(Pi),i＝1～B (8)
Secondly, CP processing is added, and the OFDM symbol output is formula (9)
Figure GDA0003020424570000041
Preferably, in step 4, in order to implement the data output rate and the system data rate R under different subcarrier space configuration parameterssThe consistency of the method is that the rate matching processing is carried out on each BWP symbol data, the time domain interpolation is realized according to the interpolation configuration parameter O, the linear interpolation is adopted, and the processed result is output as the formula (10)
Figure GDA0003020424570000042
Preferably, in step 5, for the BWP data to be moved to the corresponding spectrum position, the central position pst according to the BWP is determinedBWP iThe parameters are carried out frequency spectrum shifting, the method of complex multiplication carrier wave is adopted for realizing, and the processed result is output Qi。
Preferably, in step 6, the data after the spectrum shift is subjected to synchronous merging processing, BWP data are added in complex according to synchronous parameters, and the resultant single-path data is output as formula (11), thereby completing the generation of 5G baseband signals,
Figure GDA0003020424570000043
the invention has the following beneficial effects:
the low-delay 5G baseband signal generation method adopts a CP direct output preprocessing technology to output a baseband signal one symbol time ahead, adopts a time domain rate matching technology to greatly reduce the baseband processing delay, meets the requirements of a 5G system on high rate and low delay of the 5G baseband signal generation, can be applied to a 5G system signal generator and a baseband generation module, and effectively promotes the standard verification of the 5G system and hardware research.
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FIG. 1 shows a low-latency 5G baseband signal generation step;
FIG. 23 GPP R15 protocol Release
Figure GDA0003020424570000044
uiA relationship of (i ═ 1,2,. B);
FIG. 3 illustrates error values of a conventional CP-OFDM process and an improved CP-OFDM process;
FIG. 4 is a schematic diagram of the low latency 5G baseband signal generation;
fig. 5 shows the time correspondence of a frame, a subframe and a symbol with a subcarrier configuration parameter of 1 in the system;
the time correspondence of the frame, subframe and symbol with the subcarrier configuration parameter of 3 in the system of fig. 6.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1 and 4, a low-latency 5G baseband signal generating method, where a low-latency 5G baseband signal generating device includes a system synchronization module, a preprocessing module, an IFFT module, a CP adding module, a rate matching module, a spectrum shifting module, and a synchronization combining module, where system parameters of a 5G system enter the system synchronization module to provide parameters for the preprocessing module, the CP adding module, the rate matching module, the spectrum shifting module, and the synchronization combining module; the data of different BWP resource elements of the 5G system and the parameters output by the system synchronization module enter respective preprocessing modules to finish the processing of the prior output CP of each BWP; the preprocessing module of each BWP outputs data to enter into the IFFT module of each BWP, finish the frequency domain to time domain conversion; the IFFT module output data of each BWP and the parameters output by the system synchronization module enter into respective CP adding modules to finish the output of 5G symbol data; the data output by the CP increasing module of each BWP and the parameters output by the system synchronization module enter into respective rate matching modules to complete the processing of matching all the BWP data rates to the system data rate; the data output by the rate matching module of each BWP and the parameters output by the system synchronization module enter respective spectrum shifting modules to finish the one-to-one correspondence of the frequency domain positions of all BWP data; the output data of the BWP spectrum shifting module and the synchronous parameters output by the system synchronization module enter a synchronous merging module to complete the synchronous merging processing of all BWP data, and the 5G baseband signal output is realized.
CP preprocessing module length L according to IFFTifftGenerating a complete set of pre-processing coefficients present in the ROM according to the CP length
Figure GDA0003020424570000051
Outputting the pre-processing coefficients with data X of BWP resource elements entering the moduleiCarrying out complex multiplication to complete the preprocessing function of each BWP;
the IFFT module performs L on the preprocessed data of each BWPifftIFFT conversion of length, directly calling FFT IP core, and completing IFFT processing function of each BWP;
the added CP module directly outputs the IFFT processed data entering each BWP and stores the length of the CP before
Figure GDA0003020424570000052
After the IFFT data is output, sequentially outputting the stored data to complete the function of increasing the CP of each BWP;
the rate matching module has more interpolation configuration parameters O for the data after the CP is added and enters each BWPiLinear interpolation is carried out to match the data rates of different BWPs to the system data rate, and the rate matching function of each BWP is completed;
the frequency spectrum moving module is realized by adopting a complex multiplication carrier wave method, and moves the BWP data to a corresponding frequency spectrum position.
The synchronization combination module utilizes the symbol synchronization signal SYNCsymbAnd symbol index liAnd performing synchronous complex addition processing on the data entering each BWP after spectrum shifting to finish the generation of 5G baseband signals.
The method adopts a CP direct output preprocessing technology and a time domain rate matching technology, and specifically comprises the following steps:
step 1: determining configuration parameters of each processing unit according to system parameters transmitted by a high layer;
step 2: preprocessing the value of each BWP resource element;
and step 3: carrying out improved CP-OFDM processing on the preprocessed BWP data to realize the output of BWP symbol data, carrying out IFFT processing firstly, and after preprocessing, IFFT outputs CP firstly, thus directly outputting; secondly, the CP data is output firstly, after the IFFT output is finished, the CP is output in sequence, and the symbol data is output for the CP adding processing;
and 4, step 4: carrying out rate matching processing on BWP symbol data, realizing consistency of data output rate and system data output rate under different subcarrier space configuration parameters, eliminating crosstalk among BWPs, and realizing time domain interpolation according to an interpolation configuration parameter O, wherein the processing steps comprise 0 complementing and filtering;
and 5: carrying out spectrum moving processing on the data after the rate matching, and moving the BWP data to a corresponding spectrum position;
step 6: and performing synchronous combination processing on the data subjected to frequency spectrum shifting, synthesizing single-path data output, finishing the generation of a 5G baseband signal, and finishing the synchronous combination output of the signal by utilizing a frame synchronous signal, a subframe synchronous signal, a half subframe synchronous signal, a time slot synchronous signal and a symbol synchronous signal generated by a system synchronous generator.
Preferably, in step 1, the system parameters include a system bandwidth BD, BWP number B, and a subcarrier configuration parameter ui(i ═ 1, 2.. B), CP type C, configuration parameters of each processing unit, including IFFT length LIFFTPreprocessed CP Length parameterLCPCenter position pst of rate-matched interpolation configuration parameter O, BWPBWP i(i＝1,2,...B)；
According to the bandwidth BD and the subcarrier configuration parameter u of the 5G signali(i ═ 1, 2.. B), the length L of the IFFT is determined by equation (1)ifftIs composed of
Lifft＝2N (1)
Wherein N satisfies
Figure GDA0003020424570000061
B, the minimum IFFT length is 4096 based on the 3GPP R15 protocol, and IFFT implementation consistency, taking N as 12, i.e. the length L of the IFFTifft4096;
configuring parameter u according to subcarrieri( i 1, 2.. B) determining a system data rate RsI.e. combining the output data rate RsExpressed by formula (2):
Rs＝Lifft·15·2max_uksps (2)
wherein max _ u is a parameter u for configuring the system subcarrieriMaximum value of (i ═ 1, 2.. B), LifftIs the length of the IFFT;
determining the length of the CP according to the CP type C, i.e. normal CP or extended CP
Figure GDA0003020424570000062
Represented by formula (3):
Figure GDA0003020424570000063
wherein, i is 1, 2., B,
Figure GDA0003020424570000064
Figure GDA0003020424570000065
configuring parameter mu for sub-carriersiThe number of slots in the sub-frame below,
Figure GDA0003020424570000066
is the number of symbols on the slot, LifftIs the length of the IFFT; 3GPP R15 protocol release
Figure GDA0003020424570000067
uiThe relationship of (i ═ 1, 2.. B) is shown in fig. 2;
according to the system parameter ui(i ═ 1, 2.. B), rate-matched interpolation configuration parameter O is determined using equation (4)iIs composed of
Figure GDA0003020424570000068
Where, i is 1, 2., B, max _ u, which is the system subcarrier configuration parameter uiA maximum value of (i ═ 1,2,. B); fig. 5 shows the time correspondence of a frame, a subframe and a symbol with a system subcarrier configuration parameter of 1; fig. 6 shows the time correspondence of a frame, a subframe and a symbol with a system subcarrier configuration parameter of 3;
data on each BWP resource element is expressed by equation (5)
Figure GDA0003020424570000071
Wherein, i is 1 to B, and is data after resource mapping.
In step 2, the values of the BWP resource elements are preprocessed, the processing result is expressed by formula (6),
Figure GDA0003020424570000072
wherein, XiFor data on the ith BWP resource element, as a pre-processing parameter PM, the PM is expressed by equation (7),
Figure GDA0003020424570000073
wherein 1i is a complex unit.
In step 3, the preprocessed BWP data is processed by CP-OFDM, and then IFFT is performed to output the result as formula (8)
Ii＝ifft(Pi),i＝1～B (8)
Secondly, CP processing is added, and the OFDM symbol output is formula (9)
Figure GDA0003020424570000074
Compared with the traditional CP adding method, the IFFT outputs the CP firstly, so the IFFT is directly output, then the CP data at the front part of the IFFT is repeatedly output, the CP adding processing is completed, and the symbol data is output; fig. 3 shows the error values of the conventional CP-OFDM processing and the modified CP-OFDM processing, the IFFT length is 4096, the CP length is 1024, the data source is PN9, QPSK modulation is used, and the number of effective RBs is 3300.
In the step 4, in order to realize the data output rate and the system data rate R under different subcarrier space configuration parameterssThe consistency of the method is that the rate matching processing is carried out on each BWP symbol data, the time domain interpolation is realized according to the interpolation configuration parameter O, the linear interpolation is adopted, and the processed result is output as the formula (10)
Figure GDA0003020424570000075
In the step 5, for the BWP data to be moved to the corresponding spectrum position, the center position pst of BWP is determinedBWP iThe parameters are carried out frequency spectrum shifting, the method of complex multiplication carrier wave is adopted for realizing, and the processed result is output Qi。
In the step 6, the data after the spectrum shift is synchronized and merged, and each BWP data is added according to the synchronization parameters to synthesize a single path data output as formula (11), thereby completing the generation of 5G baseband signals,
Figure GDA0003020424570000076
it is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.

Claims (6)

1. A low-delay 5G baseband signal generating method comprises a system synchronization module, a preprocessing module, an IFFT module, a CP adding module, a rate matching module, a frequency spectrum shifting module and a synchronization merging module, wherein system parameters of a 5G system enter the system synchronization module to provide parameters for the preprocessing module, the CP adding module, the rate matching module, the frequency spectrum shifting module and the synchronization merging module; the method is characterized in that a CP direct output preprocessing technology and a time domain rate matching technology are adopted, and the method specifically comprises the following steps:
step 1: determining configuration parameters of each processing unit according to system parameters transmitted by a high layer;
in step 1, the system parameters include the system bandwidth BD, the BWP number B, and the subcarrier configuration parameter ui(i ═ 1, 2.. B), CP type C, configuration parameters of each processing unit, including IFFT length LIFFTPreprocessed CP length parameter LCPCenter position pst of rate-matched interpolation configuration parameter O, BWPBWP i(i＝1,2,...B)；
According to the bandwidth BD and the subcarrier configuration parameter u of the 5G signali(i ═ 1, 2.. B), the length L of the IFFT is determined by equation (1)ifftIs composed of
Lifft＝2N (1)
Wherein N satisfies
Figure FDA0003020424560000017
B, the minimum IFFT length is 4096 based on the 3GPP R15 protocol, and IFFT implementation consistency, taking N as 12, i.e. the length L of the IFFTifft4096;
configuring parameter u according to subcarrieri(i 1, 2.. B) determining a system data rate RsI.e. combining the output data rate RsExpressed by formula (2):
Rs＝Lifft·15·2max_uksps (2)
wherein max _ u is a parameter u for configuring the system subcarrieriMaximum value of (i ═ 1, 2.. B), LifftIs the length of the IFFT;
determining the length of the CP according to the CP type C, i.e. normal CP or extended CP
Figure FDA0003020424560000011
Represented by formula (3):
Figure FDA0003020424560000012
wherein, i is 1, 2., B,
Figure FDA0003020424560000013
Figure FDA0003020424560000014
configuring parameter mu for sub-carriersiThe number of slots in the sub-frame below,
Figure FDA0003020424560000015
is the number of symbols on the slot, LifftIs the length of the IFFT;
according to the system parameter ui(i ═ 1, 2.. B), rate-matched interpolation configuration parameter O is determined using equation (4)iIs composed of
Figure FDA0003020424560000016
Where, i is 1, 2., B, max _ u, which is the system subcarrier configuration parameter uiA maximum value of (i ═ 1,2,. B);
data on each BWP resource element is expressed by equation (5)
Figure FDA0003020424560000021
Wherein, i is 1 to B and is data after resource mapping;
step 2: preprocessing the value of each BWP resource element;
and step 3: carrying out improved CP-OFDM processing on the preprocessed BWP data to realize the output of BWP symbol data, carrying out IFFT processing firstly, and after preprocessing, IFFT outputs CP firstly, thus directly outputting; secondly, the CP data is output firstly, after the IFFT output is finished, the CP is output in sequence, and the symbol data is output for the CP adding processing;
and 4, step 4: carrying out rate matching processing on BWP symbol data, realizing consistency of data output rate and system data output rate under different subcarrier space configuration parameters, eliminating crosstalk among BWPs, and realizing time domain interpolation according to an interpolation configuration parameter O, wherein the processing steps comprise 0 complementing and filtering;
and 5: carrying out spectrum moving processing on the data after the rate matching, and moving the BWP data to a corresponding spectrum position;
step 6: and performing synchronous combination processing on the data subjected to frequency spectrum shifting, synthesizing single-path data output, finishing the generation of a 5G baseband signal, and finishing the synchronous combination output of the signal by utilizing a frame synchronous signal, a subframe synchronous signal, a half subframe synchronous signal, a time slot synchronous signal and a symbol synchronous signal generated by a system synchronous generator.
2. The method for generating low-latency 5G baseband signal according to claim 1, wherein in step 2, the value of each BWP resource element is preprocessed, the result of the preprocessing is represented by equation (6),
Figure FDA0003020424560000022
wherein, XiFor the ith BWP resourceThe data on the elements are preprocessing parameters PM, and the PM is expressed by an equation (7),
Figure FDA0003020424560000023
wherein 1i is a complex unit.
3. The method as claimed in claim 1, wherein in step 3, the preprocessed BWP data is further processed by CP-OFDM, IFFT is performed first, and the output is formula (8)
Ii＝ifft(Pi),i＝1～B (8)
Secondly, CP processing is added, and the OFDM symbol output is formula (9)
Figure FDA0003020424560000024
4. The method as claimed in claim 1, wherein in step 4, the data output rate and the system data rate R under different subcarrier space configuration parameters are achievedsThe consistency of the method is that the rate matching processing is carried out on each BWP symbol data, the time domain interpolation is realized according to the interpolation configuration parameter O, the linear interpolation is adopted, and the processed result is output as the formula (10)
Figure FDA0003020424560000031
5. The method for generating low-latency 5G baseband signal according to claim 1, wherein in step 5, for the BWP data to be moved to the corresponding spectral position, the center position pst of BWP is determined according toBWP iThe parameters are carried out frequency spectrum shifting, the method of complex multiplication carrier wave is adopted to realize, and the processed result is outputOut of Qi。
6. The method as claimed in claim 1, wherein in step 6, the spectrum shifted data is synchronously combined, and the BWP data are added in complex according to the synchronous parameters to synthesize a single path of data and output as equation (11), thereby completing the generation of 5G baseband signal,
Figure FDA0003020424560000032
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