CN114050956B - Wireless signal processing method and wireless signal receiver - Google Patents

Wireless signal processing method and wireless signal receiver Download PDF

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CN114050956B
CN114050956B CN202111320556.5A CN202111320556A CN114050956B CN 114050956 B CN114050956 B CN 114050956B CN 202111320556 A CN202111320556 A CN 202111320556A CN 114050956 B CN114050956 B CN 114050956B
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fft
rbs
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wireless signal
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CN114050956A (en
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陈艳霞
郭璟
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Shanghai Silang Technology Co ltd
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Shanghai Silang Technology Co ltd
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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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

The application provides a wireless signal processing method and a wireless signal receiver, wherein when a signal is received, the method obtains the RB number of the signal, searches the RB section which the RB number belongs to in the pre-divided reference RB section, and if so, searches the FFT module which corresponds to the RB section which the RB number belongs to in the FFT module which is respectively constructed for each reference RB section, so as to realize self-adaptive selection of the proper FFT module according to the RB number of the signal, and utilizes the corresponding FFT module to carry out OFDM demodulation on the signal, thereby ensuring that the result of the OFDM demodulation is in a reasonable range and ensuring the receiving performance of the wireless signal receiver.

Description

Wireless signal processing method and wireless signal receiver
Technical Field
The present application relates to the field of communications technologies, and in particular, to a wireless signal processing method and a wireless signal receiver.
Background
In a multi-carrier communication system, a plurality of sub-carriers are transmitted simultaneously on one transmission path. OFDM (orthogonal frequency division multiplexing) is a commonly used multi-carrier scheme in which a plurality of sub-carriers are orthogonal in frequency. Subcarriers within an OFDM carrier signal typically overlap in frequency, but do not interfere with each other.
Wireless signal receivers employing OFDM typically employ a Fast Fourier Transform (FFT) to separate subcarriers in a received OFDM carrier signal. However, a fixed FFT scheme is generally used at present, which has a problem of affecting the reception performance.
Disclosure of Invention
The application provides the following technical scheme:
a wireless signal processing method, applied to a wireless signal receiver, the method comprising:
When a signal is received, acquiring the RB number of the signal;
searching RB sections to which the number of RBs belongs in pre-divided reference RB sections;
If so, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
If the target FFT module is found, OFDM demodulation is carried out on the signal by utilizing the target FFT module, and a demodulation result is obtained.
Optionally, the pre-dividing process of the reference RB interval includes:
And dividing the RBs of the scheduling bandwidth configuration supportable by the wireless signal receiver into a plurality of groups of RBs, wherein each group of RBs is respectively used as a reference RB interval, and each group of RBs respectively comprises at least one RB.
Optionally, the process of respectively constructing the FFT module for each reference RB interval includes:
respectively executing butterfly operation simulation process for each reference RB section to obtain an FFT proposal with the capability of maximizing the output fixed-point signal and outputting the output without saturation and overflow;
the module for executing the FFT scheme is taken as an FFT module.
Optionally, the method further comprises:
obtaining a scaling factor from the demodulation result;
Performing de-resource mapping on the demodulation result to obtain frequency domain signals of all channels;
if the frequency domain signal of the channel occupies a plurality of time domain symbols, carrying out alignment of a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the smallest scaling factor as a reference;
and detecting and decoding the frequency domain signals of which the multiple time domain inter-symbol scaling factors of each channel are aligned to obtain decoding results.
Optionally, before the obtaining the RB number of the signal, the method further includes:
Performing time domain AGC adjustment on the signal to obtain a target signal;
The OFDM demodulation is carried out on the signal by utilizing the target FFT module to obtain a demodulation result, which comprises the following steps:
and carrying out OFDM demodulation on the target signal by utilizing the target FFT module to obtain a demodulation result.
A wireless signal receiver, comprising: a processor and a memory;
the memory is used for storing at least one group of instruction sets;
The processor is used for calling and executing the instruction set in the memory, and the following processing is performed by executing the instruction set:
When a signal is received, acquiring the RB number of the signal;
searching RB sections to which the number of RBs belongs in pre-divided reference RB sections;
If so, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
If the target FFT module is found, OFDM demodulation is carried out on the signal by utilizing the target FFT module, and a demodulation result is obtained.
Optionally, the processor is further configured to:
And dividing the RBs of the scheduling bandwidth configuration supportable by the wireless signal receiver into a plurality of groups of RBs, wherein each group of RBs is respectively used as a reference RB interval, and each group of RBs respectively comprises at least one RB.
Optionally, the processor is further configured to:
respectively executing butterfly operation simulation process for each reference RB section to obtain an FFT proposal with the capability of maximizing the output fixed-point signal and outputting the output without saturation and overflow;
the module for executing the FFT scheme is taken as an FFT module.
Optionally, the processor is further configured to:
obtaining a scaling factor from the demodulation result;
Performing de-resource mapping on the demodulation result to obtain frequency domain signals of all channels;
if the frequency domain signal of the channel occupies a plurality of time domain symbols, carrying out alignment of a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the smallest scaling factor as a reference;
and detecting and decoding the frequency domain signals of which the multiple time domain inter-symbol scaling factors of each channel are aligned to obtain decoding results.
Optionally, the processor is further configured to:
Before the RB number of the signal is obtained, performing time domain AGC adjustment on the signal to obtain a target signal;
The process of performing OFDM demodulation on the signal by using the target FFT module to obtain a demodulation result includes:
and carrying out OFDM demodulation on the target signal by utilizing the target FFT module to obtain a demodulation result.
Compared with the prior art, the application has the beneficial effects that:
In the application, when a signal is received, the RB number of the signal is obtained, the RB section to which the RB number belongs is searched in the pre-divided reference RB sections, if so, the FFT module corresponding to the RB section to which the RB number belongs is searched in the FFT modules respectively constructed for each reference RB section, so that the proper FFT module is adaptively selected according to the RB number of the signal, the corresponding FFT module is utilized to carry out OFDM demodulation on the signal, the OFDM demodulation result is ensured to be in a reasonable range, and the receiving performance of the wireless signal receiver is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a flow chart of a wireless signal processing method provided in embodiment 1 of the present application;
Fig. 2 is a flow chart of a wireless signal processing method provided in embodiment 2 of the present application;
fig. 3 is a flow chart of a wireless signal processing method provided in embodiment 3 of the present application;
fig. 4 is a schematic structural diagram of a wireless signal receiver according to the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order to solve the above-mentioned problems, the present application provides a wireless signal processing method, and the wireless signal processing method provided by the present application is described next.
Referring to fig. 1, a flow chart of a wireless signal processing method according to embodiment 1 of the present application is provided, and the method is applied to a wireless signal receiver, as shown in fig. 1, and the method may include, but is not limited to, the following steps:
Step S11, when a signal is received, the RB number of the signal is obtained.
In this embodiment, when a signal is received, the RB number of the signal may be obtained from control information sent by a transmitting end (e.g., a base station) received by a wireless signal receiver.
And step S12, searching the RB section to which the RB number belongs in the pre-divided reference RB section.
In this embodiment, RBs configured with a scheduling bandwidth supportable by the radio signal receiver may be divided into multiple groups of RBs in advance, where each group of RBs is respectively used as a reference RB interval, and each group of RBs respectively includes at least one RB.
Assuming that the number of RBs included in the scheduling bandwidth corresponding to the ith interval is divided into I intervals within the range of [ N i-1,Ni ]
Searching the RB intervals to which the number of RBs belongs in the pre-divided reference RB intervals can be understood as: searching a reference RB section containing the number of RBs in the pre-divided reference RB sections, wherein the reference RB section containing the number of RBs is the RB section to which the number of RBs belongs. For example, if there are J reference RB sections divided in advance, the i-th reference RB section is [ N i-1,Nn ], and if the number of RBs is N i-1, the i-th reference RB section is the RB section to which the number of RBs belongs.
If so, step S13 is performed.
And S13, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing the output fixed-point signal and outputting the output without saturation overflow.
In this embodiment, the process of respectively constructing the FFT module for each reference RB interval may include:
s131, for each reference RB section, respectively executing butterfly operation simulation process to obtain the FFT proposal with the capability of maximizing the output fixed-point signal and outputting the output without saturation overflow.
The scaling factor corresponding to the FFT scheme can be recorded while the FFT scheme with the capability of maximizing the output fixed point signal and outputting the output without saturation overflow is obtained.
S132, taking a module for executing the FFT scheme as an FFT module.
If the target FFT module is found, step S14 is performed.
And S14, performing OFDM demodulation on the signal by utilizing the target FFT module to obtain a demodulation result.
In the application, when a signal is received, the RB number of the signal is obtained, the RB section to which the RB number belongs is searched in the pre-divided reference RB sections, if so, the FFT module corresponding to the RB section to which the RB number belongs is searched in the FFT modules respectively constructed for each reference RB section, so that the proper FFT module is adaptively selected according to the RB number of the signal, the corresponding FFT module is utilized to carry out OFDM demodulation on the signal, the OFDM demodulation result is ensured to be in a reasonable range, and the receiving performance of the wireless signal receiver is ensured.
As another alternative embodiment of the present application, referring to fig. 2, a flow chart of a wireless signal processing method provided in embodiment 2 of the present application is mainly an extension of the wireless signal processing method described in embodiment 1 above, and as shown in fig. 2, the method may include, but is not limited to, the following steps:
step S21, when a signal is received, the RB number of the signal is acquired.
Step S22, searching the RB section to which the RB number belongs in the pre-divided reference RB section.
If so, step S23 is performed.
Step S23, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
If the target FFT module is found, step S24 is performed.
And step S24, carrying out OFDM demodulation on the signal by utilizing the target FFT module to obtain a demodulation result.
The detailed procedure of steps S21-S24 can be referred to in the related description of steps S11-S14 in embodiment 1, and will not be described herein.
And S25, obtaining a scaling factor from the demodulation result.
And S26, performing de-resource mapping on the demodulation result to obtain frequency domain signals of all channels.
And step S27, if the frequency domain signal of the channel occupies a plurality of time domain symbols, aligning a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the smallest scaling factor as a reference.
And carrying out alignment of a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the minimum scaling factor as a reference, so that the same scaling multiple of the frequency domain signals on all the time domain symbols of the channel can be ensured.
And step S28, detecting and decoding the frequency domain signals aligned by the plurality of time domain inter-symbol scaling factors of each channel to obtain decoding results.
In this embodiment, the target FFT module is utilized to perform OFDM demodulation on the signal, so as to obtain a demodulation result, and on the basis of ensuring the accuracy of the demodulation result, obtain scaling factors from the demodulation result, and perform de-resource mapping on the signal, so as to obtain a frequency domain signal of each channel, if the frequency domain signal of the channel occupies multiple time domain symbols, perform alignment of multiple time domain inter-symbol scaling factors with the time domain symbol with the smallest scaling factor as a reference, detect and decode the frequency domain signal aligned by the multiple time domain inter-symbol scaling factors of each channel, so as to obtain a decoding result, and ensure the accuracy of the decoding result.
As another alternative embodiment of the present application, referring to fig. 3, a flow chart of a wireless signal processing method provided in embodiment 3 of the present application is mainly a refinement of the wireless signal processing method described in embodiment 2 above, and as shown in fig. 3, the method may include, but is not limited to, the following steps:
and step S31, when a signal is received, performing time domain AGC adjustment on the signal to obtain a target signal, and acquiring the RB number of the target signal.
And performing time domain AGC adjustment on the signal to ensure that the power of the target signal is within a preset range. It should be noted that the preset range is determined based on the processing requirement of the FFT module.
And step S32, searching the RB section to which the RB number belongs in the pre-divided reference RB section.
If so, step S33 is performed.
Step S33, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
if the target FFT module is found, step S34 is performed.
And step S34, performing OFDM demodulation on the target signal by using the target FFT module to obtain a demodulation result.
The detailed procedure of steps S32-S34 can be referred to in the related description of steps S12-S14 in embodiment 2, and will not be described herein.
In this embodiment, the time domain AGC adjustment is performed on the signal, so that the power of the target signal is guaranteed to be within a preset range, and the target FFT module is used to perform OFDM demodulation on the target signal, so as to obtain a demodulation result, further improve the accuracy of the demodulation result, and further improve the receiving performance of the wireless signal receiver.
Next, the radio signal receiver provided by the present application will be described, and the radio signal receiver described below and the radio signal processing method described above may be referred to correspondingly.
Referring to fig. 4, the wireless signal receiver may include: memory 100 and processor 200.
The memory 100 is configured to store at least one set of instructions;
the processor 200 is configured to call and execute the instruction set in the memory 100, and perform the following processing by executing the instruction set:
When a signal is received, acquiring the RB number of the signal;
searching RB sections to which the number of RBs belongs in pre-divided reference RB sections;
If so, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
If the target FFT module is found, OFDM demodulation is carried out on the signal by utilizing the target FFT module, and a demodulation result is obtained.
In this embodiment, the processor 200 may be further configured to:
And dividing the RBs of the scheduling bandwidth configuration supportable by the wireless signal receiver into a plurality of groups of RBs, wherein each group of RBs is respectively used as a reference RB interval, and each group of RBs respectively comprises at least one RB.
In this embodiment, the processor 200 may be further configured to:
respectively executing butterfly operation simulation process for each reference RB section to obtain an FFT proposal with the capability of maximizing the output fixed-point signal and outputting the output without saturation and overflow;
the module for executing the FFT scheme is taken as an FFT module.
In this embodiment, the processor 200 may be further configured to:
obtaining a scaling factor from the demodulation result;
Performing de-resource mapping on the demodulation result to obtain frequency domain signals of all channels;
if the frequency domain signal of the channel occupies a plurality of time domain symbols, carrying out alignment of a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the smallest scaling factor as a reference;
and detecting and decoding the frequency domain signals of which the multiple time domain inter-symbol scaling factors of each channel are aligned to obtain decoding results.
In this embodiment, the processor 200 may be further configured to:
Before the RB number of the signal is obtained, performing time domain AGC adjustment on the signal to obtain a target signal;
The process of performing OFDM demodulation on the signal by using the target FFT module by the processor 200 to obtain a demodulation result specifically includes:
and carrying out OFDM demodulation on the target signal by utilizing the target FFT module to obtain a demodulation result.
It should be noted that, in each embodiment, the differences from the other embodiments are emphasized, and the same similar parts between the embodiments are referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
From the above description of embodiments, it will be apparent to those skilled in the art that the present application may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
The above description of the wireless signal processing method and the wireless signal receiver provided by the present application applies specific examples to illustrate the principles and embodiments of the present application, and the above examples are only used to help understand the method and the core idea of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A wireless signal processing method, applied to a wireless signal receiver, comprising:
When a signal is received, acquiring the RB number of the signal;
searching RB sections to which the number of RBs belongs in pre-divided reference RB sections;
If so, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
If the target FFT module is found, OFDM demodulation is carried out on the signal by utilizing the target FFT module, and a demodulation result is obtained.
2. The method of claim 1, wherein the pre-partitioning of the reference RB interval comprises:
And dividing the RBs of the scheduling bandwidth configuration supportable by the wireless signal receiver into a plurality of groups of RBs, wherein each group of RBs is respectively used as a reference RB interval, and each group of RBs respectively comprises at least one RB.
3. The method of claim 2, wherein the process of constructing the FFT module for each of the reference RB intervals, respectively, comprises:
respectively executing butterfly operation simulation process for each reference RB section to obtain an FFT proposal with the capability of maximizing the output fixed-point signal and outputting the output without saturation and overflow;
the module for executing the FFT scheme is taken as an FFT module.
4. A method according to any one of claims 1-3, characterized in that the method further comprises:
obtaining a scaling factor from the demodulation result;
Performing de-resource mapping on the demodulation result to obtain frequency domain signals of all channels;
if the frequency domain signal of the channel occupies a plurality of time domain symbols, carrying out alignment of a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the smallest scaling factor as a reference;
and detecting and decoding the frequency domain signals of which the multiple time domain inter-symbol scaling factors of each channel are aligned to obtain decoding results.
5. A method according to any one of claims 1-3, wherein prior to said obtaining the number of RBs of said signal, further comprising:
Performing time domain AGC adjustment on the signal to obtain a target signal;
The OFDM demodulation is carried out on the signal by utilizing the target FFT module to obtain a demodulation result, which comprises the following steps:
and carrying out OFDM demodulation on the target signal by utilizing the target FFT module to obtain a demodulation result.
6. A wireless signal receiver, comprising: a memory and a processor;
the memory is used for storing at least one group of instruction sets;
The processor is used for calling and executing the instruction set in the memory, and the following processing is performed by executing the instruction set:
When a signal is received, acquiring the RB number of the signal;
searching RB sections to which the number of RBs belongs in pre-divided reference RB sections;
If so, searching target FFT modules corresponding to the RB intervals to which the number of RBs belongs in the FFT modules respectively constructed for each reference RB interval, wherein the FFT modules respectively constructed for each reference RB interval have the capability of maximizing output fixed-point signals and outputting the signals without saturation and overflow;
If the target FFT module is found, OFDM demodulation is carried out on the signal by utilizing the target FFT module, and a demodulation result is obtained.
7. The wireless signal receiver of claim 6, wherein the processor is further configured to:
And dividing the RBs of the scheduling bandwidth configuration supportable by the wireless signal receiver into a plurality of groups of RBs, wherein each group of RBs is respectively used as a reference RB interval, and each group of RBs respectively comprises at least one RB.
8. The wireless signal receiver of claim 7, wherein the processor is further configured to:
respectively executing butterfly operation simulation process for each reference RB section to obtain an FFT proposal with the capability of maximizing the output fixed-point signal and outputting the output without saturation and overflow;
the module for executing the FFT scheme is taken as an FFT module.
9. The wireless signal receiver of any of claims 6-8, wherein the processor is further configured to:
obtaining a scaling factor from the demodulation result;
Performing de-resource mapping on the demodulation result to obtain frequency domain signals of all channels;
if the frequency domain signal of the channel occupies a plurality of time domain symbols, carrying out alignment of a plurality of time domain inter-symbol scaling factors by taking the time domain symbol with the smallest scaling factor as a reference;
and detecting and decoding the frequency domain signals of which the multiple time domain inter-symbol scaling factors of each channel are aligned to obtain decoding results.
10. The wireless signal receiver of any of claims 6-8, wherein the processor is further configured to:
Before the RB number of the signal is obtained, performing time domain AGC adjustment on the signal to obtain a target signal;
The process of performing OFDM demodulation on the signal by using the target FFT module to obtain a demodulation result includes:
and carrying out OFDM demodulation on the target signal by utilizing the target FFT module to obtain a demodulation result.
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