CN117135022A - Noise suppression method and device for OFDM (orthogonal frequency division multiplexing) signals - Google Patents
Noise suppression method and device for OFDM (orthogonal frequency division multiplexing) signals Download PDFInfo
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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
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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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
Abstract
The application provides a noise suppression method and device for OFDM signals. The method comprises the following steps: dividing received orthogonal frequency division multiplexing data into data blocks with a preset first value; performing Fourier transform on each data block to obtain a plurality of first frequency domain data; according to preset subcarrier configuration information, assigning 0 to data at the position of an unconfigured subcarrier in subcarrier configuration information in the plurality of first frequency domain data to obtain a plurality of second frequency domain data, wherein the subcarrier configuration information is information for configuring subcarriers to be reserved; and performing inverse Fourier transform on the plurality of second frequency domain data to obtain a plurality of time domain data so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data. The technical scheme of the embodiment of the application can improve the noise suppression effect of the OFDM signal.
Description
Technical Field
The present application relates to the field of computer technologies, and in particular, to a method and an apparatus for noise suppression of an OFDM signal.
Background
OFDM (Orthogonal Frequency Division Multiplexing ) is a signal modulation technique.
In the OFDM modulation scheme, user information is carried on different carriers orthogonal to each other, so that noise cannot be eliminated by the spread spectrum scheme, and in order to ensure spectrum efficiency, noise cannot be reduced by the conventional frequency multiplexing method using a higher multiplexing coefficient, and thus, the effect of noise suppression on the OFDM signal is not good.
How to perform noise suppression of OFDM signals is a technical problem that needs to be solved currently.
Disclosure of Invention
In view of this, the embodiments of the present application provide a method and an apparatus for noise suppression of an OFDM signal, so as to solve the technical problem in the prior art that the effect of noise suppression on the OFDM signal is poor.
In a first aspect of an embodiment of the present application, there is provided a method for noise suppression of an OFDM signal, including: dividing received orthogonal frequency division multiplexing data into data blocks with a preset first value; performing Fourier transform on each data block to obtain a plurality of first frequency domain data; according to preset subcarrier configuration information, assigning 0 to data at the position of an unconfigured subcarrier in subcarrier configuration information in the plurality of first frequency domain data to obtain a plurality of second frequency domain data, wherein the subcarrier configuration information is information for configuring subcarriers to be reserved; and performing inverse Fourier transform on the plurality of second frequency domain data to obtain a plurality of time domain data so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data.
In a second aspect of an embodiment of the present application, there is provided a noise suppression apparatus for an OFDM signal, the apparatus including: the preprocessing module is used for dividing the received orthogonal frequency division multiplexing data into data blocks with the size of a preset first value; the transformation module is used for carrying out Fourier transformation on each data block to obtain a plurality of first frequency domain data; the processing module is used for assigning 0 to data at the position of an unconfigured subcarrier in subcarrier configuration information in the plurality of first frequency domain data according to preset subcarrier configuration information to obtain a plurality of second frequency domain data, wherein the subcarrier configuration information is information for configuring subcarriers to be reserved; and the inverse transformation module is used for carrying out inverse Fourier transformation on the plurality of second frequency domain data to obtain a plurality of time domain data so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data.
In a third aspect of the embodiments of the present application, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.
In a fourth aspect of the embodiments of the present application, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the above method.
Compared with the prior art, the embodiment of the application has the beneficial effects that: according to the technical scheme, the orthogonal frequency division multiplexing data is divided into the data blocks and subjected to Fourier transform to obtain the frequency domain data of the data blocks, the data of the non-configured subcarrier wave bands in the frequency domain data are subjected to zero setting processing, and then the time domain data are obtained by carrying out Fourier transform, so that noise interference of subcarriers except the configured subcarriers is eliminated, noise suppression of the orthogonal frequency division multiplexing data is realized, and communication quality of the orthogonal frequency division multiplexing communication is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a noise suppression method for an OFDM signal according to an embodiment of the present application;
fig. 2 is a flowchart illustrating another method for noise suppression of an OFDM signal according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a noise suppression device for OFDM signals according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
A noise suppression method according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a diagram of a noise suppression method for an OFDM signal according to an embodiment of the present application. The method provided by the embodiment of the application can be executed by any electronic device with computer processing capability, such as a terminal or a server. As shown in fig. 1, the noise suppression method of the OFDM signal includes:
step S101, dividing the received orthogonal frequency division multiplexing data into data blocks with a preset first value.
Specifically, the received orthogonal frequency division multiplexing data is time domain data, and the data block obtained by the division processing is also time domain data. The sizes of a plurality of data blocks obtained by dividing the received orthogonal frequency division multiplexing data are the same, and the data blocks are all first numerical values. The data blocks correspond to different times and may be ordered in time order.
Step S102, fourier transform is performed on each data block to obtain a plurality of first frequency domain data.
In particular, fourier transforms represent transforms that represent some function that satisfies a certain condition as a trigonometric function or a linear combination of their integrals, which can transform time domain data into corresponding frequency domain data. The discrete fourier transform in embodiments of the application may be performed using an FFT (Fast Fourier Transform ) algorithm. The number of outputs and inputs of the fast fourier transform is identical. When fast Fourier transform is performed, the size of the Fourier transform can be set according to requirements.
Step S103, according to preset subcarrier configuration information, data at the position of an unconfigured subcarrier in subcarrier configuration information in the plurality of first frequency domain data is assigned with 0, and a plurality of second frequency domain data are obtained, wherein the subcarrier configuration information is information for configuring subcarriers to be reserved.
Specifically, the subcarrier configuration information configures subcarriers to be reserved, and band data of subcarriers not configured by the subcarrier configuration information is zeroed in step S103.
Step S104, performing inverse Fourier transform on the plurality of second frequency domain data to obtain a plurality of time domain data, so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data.
Specifically, the inverse fourier transform is an operation of solving a given fourier transform F (jω) for its corresponding primitive function F (t), and may convert frequency domain data into corresponding time domain data. In the embodiment of the application, the discrete Fourier transform in the embodiment of the application can be performed by using a fast Fourier inverse transform algorithm. And respectively corresponding the plurality of time domain data obtained by the inverse Fourier transform to the data blocks sequenced according to the time sequence one by one, and splicing the plurality of time domain data according to the corresponding time of the plurality of time domain data, so that the orthogonal frequency division multiplexing data after noise suppression can be obtained.
Orthogonal frequency division multiplexing data techniques divide a channel into smaller time-frequency resource units. Through the division of the orthogonal frequency division multiplexing data, a plurality of users can transmit in parallel, and the channel utilization rate is improved. The data and pilot in each time-frequency resource unit are contiguous and consecutive within the orthogonal frequency division multiplexing data subchannel. The orthogonal frequency division multiplexing data technique is implemented by fast fourier transform and inverse fast fourier transform. In the ofdm data, a channel is divided into a plurality of subcarriers, each of which is orthogonal and does not interfere with each other, so that there is no guard interval between the subcarriers. In the ofdm data, a subcarrier is also allocated as a null subcarrier, which does not carry any data, and is used to prevent Inter-carrier interference (Inter-Carrier Interference, ICI for short).
In the ofdm data, band data of unused subcarriers may cause interference to the used subcarriers, affecting communication quality of the ofdm communication. According to the technical scheme, the zero setting processing is carried out on the band data of the unused subcarriers, so that noise interference of the unused subcarriers on the used subcarriers is avoided, the communication quality of the orthogonal frequency division multiplexing communication is improved, and the method has the advantage of small operation amount.
In the embodiment of the application, the first value is the length of the preset orthogonal frequency division multiplexing symbol, and when the received orthogonal frequency division multiplexing data is divided into the data blocks with the size of the preset first value, the received orthogonal frequency division multiplexing data can be divided according to the length of the orthogonal frequency division multiplexing symbol to obtain the data blocks.
Specifically, when dividing received ofdm data according to the length of the ofdm symbol, the number of data blocks obtained is the quotient of the received data length and the length of the ofdm symbol.
Specifically, the number N of data blocks may be calculated according to the following formula (1):
N=((InLenth+FftSize-Indeepth-1)/(FftSize-Indeepth))（1）
wherein inlentith is the length of the received data, fftSize is the length of the OFDM symbol, and indeeph is the set guard interval. In one embodiment of the present application, indedth may have a value of 128, and the corresponding FftSize may have a value of 1024, and is not limited thereto. The setting of indeephh is only to improve the operation performance, reduce the boundary error caused by FFT operation, and ensure that the configured carrier resources are not eliminated. For a scenario where the arithmetic error requirement is not high, indeephh may be set to 0.
The formula (1) can ensure that all data are processed by performing rounding-up removal on the divisor item setting minus 1 item.
In the embodiment of the present application, the first value is the size of fourier transform, which may be 1024, 2048 and 4096, but is not limited thereto, and the size of fourier transform is typically a power of 2, i.e. 2, for convenience of calculation n Wherein n is a natural number. The size of the fourier transform may be referred to as the length of the fourier transform.
The above fourier transform size values are only exemplary descriptions and common values, and in practical applications, the fourier transform size values are not limited thereto, and only needs to ensure that the in-band signal is not damaged.
In the embodiment of the present application, the size of the fourier transform in step S102 and the size of the inverse fourier transform in step S104 may be different. The processing under the condition that the size of the inverse Fourier transform is smaller than the size of the Fourier transform is sampling processing under the condition that the in-band subcarrier data is not affected; the processing under the inverse fourier transform size larger than the fourier transform size is interpolation processing. The embodiment of the application can provide a data sampling processing method and a data interpolation processing method with excellent performance.
Before step S103, subcarrier configuration information needs to be set. In the subcarrier configuration information, subcarriers that need to be reserved may be configured, data of the subcarriers that need to be reserved will not be processed, and the subcarriers that are not configured, that is, data of the subcarriers that do not need to be reserved, will be zeroed, so as to reduce noise caused by the subcarriers that do not need to be reserved.
In one embodiment of the present application, the subcarrier configuration information may be set according to the received resource block configuration data of the orthogonal frequency division multiplexing data. OFDMA (Orthogonal Frequency Division Multiple Access ) is a multi-user OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) technique, and the main idea of OFDMA is to divide radio resources of a system into Resource Blocks (RBs) from two dimensions of the time domain and the frequency domain, where each user occupies one or more of the Resource blocks. From a frequency domain perspective, a radio resource block includes a plurality of subcarriers; in the time domain, a radio resource block includes a plurality of OFDM symbol periods.
The resource block configuration data includes configuration data for different subcarriers, in the resource block configuration data, some subcarriers are configured as data subcarriers for carrying data, some subcarriers are configured as pilot subcarriers for synchronization between a sender and a receiver, and some subcarriers are configured as unused subcarriers for protecting subcarriers or null subcarriers against interference from adjacent channels or adjacent subchannels. According to the resource block configuration data, the subcarrier bearing data, namely useful information, can be obtained, and the subcarrier bearing data need to be reserved; which subcarriers are unused and the unused subcarrier band data needs to be zeroed out. The unused subcarrier wave band data is set to zero, and the information of irrelevant frequency domains can be eliminated, so that the signal-to-noise ratio of the received data can be improved, and the demodulation performance is improved.
In addition, the subcarrier configuration information may be set according to actual needs instead of the resource block configuration data.
After step S104, the plurality of time domain data may be spliced to obtain the orthogonal frequency division multiplexing data after noise suppression.
As shown in fig. 2, in the embodiment of the present application, the data block obtained from the received ofdm data is the time domain data s 1 And (t) performing Fourier transform on the time domain data to obtain frequency domain data. Performing zero setting processing on band data of non-configuration subcarriers on the frequency domain data, performing inverse Fourier transform, and changing the band data into time domain data s 2 (t). Time domain data s corresponding to different data blocks 2 And (t) splicing the received OFDM data in sequence to obtain the OFDM data after noise suppression processing.
In the noise suppression method of the embodiment of the application, the orthogonal frequency division multiplexing data is divided into the data blocks and is subjected to Fourier transform to obtain the frequency domain data of the data blocks, the data of the undeployed subcarrier wave bands in the frequency domain data is subjected to zero setting processing, and then the time domain data is obtained by carrying out Fourier transform, so that the noise interference of subcarriers except the deployed subcarriers is eliminated, the noise suppression of the orthogonal frequency division multiplexing data is realized, and the communication quality of the orthogonal frequency division multiplexing communication is improved.
The following are examples of the apparatus of the present application that may be used to perform the method embodiments of the present application. The noise suppressing apparatus described below and the noise suppressing method described above may be referred to correspondingly to each other. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the method of the present application.
Fig. 3 is a schematic diagram of a noise suppression device for an OFDM signal according to an embodiment of the present application. As shown in fig. 3, the noise suppression device for an OFDM signal includes:
the preprocessing module 301 is configured to divide received ofdm data into data blocks having a size of a preset first value.
Specifically, the received orthogonal frequency division multiplexing data is time domain data, and the data block obtained by the division processing is also time domain data. The sizes of a plurality of data blocks obtained by dividing the received orthogonal frequency division multiplexing data are the same, and the data blocks are all first numerical values. The data blocks correspond to different times and may be ordered in time order.
The transforming module 302 is configured to perform fourier transform on each data block to obtain a plurality of first frequency domain data.
In particular, the fourier transform may convert time domain data into corresponding frequency domain data. The discrete fourier transform in embodiments of the application may be performed using an FFT (Fast Fourier Transform ) algorithm. The number of outputs and inputs of the fast fourier transform is identical. When fast Fourier transform is performed, the size of the Fourier transform can be set according to requirements.
And the processing module 303 is configured to assign 0 to data at an unconfigured subcarrier position in subcarrier configuration information in the plurality of first frequency domain data according to preset subcarrier configuration information, so as to obtain a plurality of second frequency domain data, where the subcarrier configuration information is information for configuring subcarriers to be reserved.
Specifically, the subcarrier configuration information configures the subcarriers to be reserved, and the band data of the subcarriers not configured by the subcarrier configuration information is set to zero.
The inverse transform module 304 is configured to perform inverse fourier transform on the plurality of second frequency domain data to obtain a plurality of time domain data, so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data.
In particular, the inverse fourier transform may convert the frequency domain data into corresponding time domain data. In the embodiment of the application, the discrete Fourier transform in the embodiment of the application can be performed by using a fast Fourier inverse transform algorithm. And respectively corresponding the plurality of time domain data obtained by the inverse Fourier transform to the data blocks sequenced according to the time sequence one by one, and splicing the plurality of time domain data according to the corresponding time of the plurality of time domain data, so that the orthogonal frequency division multiplexing data after noise suppression can be obtained.
Orthogonal frequency division multiplexing data techniques divide a channel into smaller time-frequency resource units. Through the division of the orthogonal frequency division multiplexing data, a plurality of users can transmit in parallel, and the channel utilization rate is improved. The data and pilot in each time-frequency resource unit are contiguous and consecutive within the orthogonal frequency division multiplexing data subchannel. The orthogonal frequency division multiplexing data technique is implemented by fast fourier transform and inverse fast fourier transform. In the ofdm data, a channel is divided into a plurality of subcarriers, each of which is orthogonal and does not interfere with each other, so that there is no guard interval between the subcarriers. In the ofdm data, one subcarrier is also allocated as a null subcarrier, which does not carry any data, for preventing inter-carrier interference.
In the ofdm data, band data of unused subcarriers may cause interference to the used subcarriers, affecting communication quality of the ofdm communication. According to the technical scheme, the zero setting processing is carried out on the band data of the unused subcarriers, so that noise interference of the unused subcarriers on the used subcarriers is avoided, the communication quality of the orthogonal frequency division multiplexing communication is improved, and the method has the advantage of small operation amount.
In the embodiment of the present application, when the first value is a length including a preset ofdm symbol, and the preprocessing module 301 divides the received ofdm data into data blocks having the size of the preset first value, the received ofdm data may be divided according to the length of the ofdm symbol, so as to obtain the data blocks.
Specifically, when the preprocessing module 301 divides the received ofdm data according to the length of the ofdm symbol, the number of the obtained data blocks is the quotient of the received data length and the length of the ofdm symbol.
Specifically, the preprocessing module 301 may calculate the number N of data blocks according to the following formula (1):
N=((InLenth+FftSize-Indeepth-1)/(FftSize-Indeepth))（1）
wherein inlentith is the length of the received data, fftSize is the length of the OFDM symbol, and indeeph is the set guard interval. In one embodiment of the present application, indeepth may take a value of 128, and the corresponding FftSize may take a value of 1024, where the setting of Indeepth is only to improve the operation performance, reduce the boundary error caused by FFT operation, and ensure that the configured carrier resources are not eliminated. The scene indeephh, which is not highly required for the operation error, may be set to 0.
The formula (1) can ensure that all data are processed by performing rounding-up removal on the divisor item setting minus 1 item.
In the embodiment of the present application, the first value is the size of fourier transform, which may be 1024, 2048 and 4096, but is not limited thereto, and the size of fourier transform is typically a power of 2, i.e. 2, for convenience of calculation n Wherein n is a natural number.
The subcarrier configuration information needs to be set before the processing module 303 assigns 0 to data at a subcarrier position that is not configured in the subcarrier configuration information in the plurality of first frequency domain data. In the subcarrier configuration information, subcarriers that need to be reserved may be configured, data of the subcarriers that need to be reserved will not be processed, and the subcarriers that are not configured, that is, data of the subcarriers that do not need to be reserved, will be zeroed, so as to reduce noise caused by the subcarriers that do not need to be reserved.
The noise suppression device of the embodiment of the application can also comprise a setting module for setting subcarrier configuration information according to the received resource block configuration data of the orthogonal frequency division multiplexing data. OFDM is a multi-user OFDM technique, and the main idea of OFDM is to divide the radio resources of a system into resource blocks from two dimensions of the time domain and the frequency domain, where each user occupies one or more of the resource blocks. From a frequency domain perspective, a radio resource block includes a plurality of subcarriers; in the time domain, a radio resource block includes a plurality of OFDM symbol periods.
The resource block configuration data includes configuration data for different subcarriers, in the resource block configuration data, some subcarriers are configured as data subcarriers for carrying data, some subcarriers are configured as pilot subcarriers for synchronization between a sender and a receiver, and some subcarriers are configured as unused subcarriers for protecting subcarriers or null subcarriers against interference from adjacent channels or adjacent subchannels. According to the resource block configuration data, the subcarrier bearing data, namely useful information, can be obtained, and the subcarrier bearing data need to be reserved; which subcarriers are unused and the unused subcarrier band data needs to be zeroed out. The unused subcarrier wave band data is set to zero, and the information of irrelevant frequency domains can be eliminated, so that the signal-to-noise ratio of the received data can be improved, and the demodulation performance is improved.
In addition, the setting module may set subcarrier configuration information according to actual needs instead of the resource block configuration data.
The noise suppression device of the embodiment of the application can also comprise a splicing module which is used for splicing the plurality of time domain data to obtain the orthogonal frequency division multiplexing data after noise suppression.
Since each functional module of the noise suppression device according to the exemplary embodiment of the present application corresponds to a step of the exemplary embodiment of the noise suppression method, for details not disclosed in the device embodiment of the present application, please refer to the embodiment of the noise suppression method according to the present application.
According to the noise suppression device provided by the embodiment of the application, the orthogonal frequency division multiplexing data is divided into the data blocks and is subjected to Fourier transform to obtain the frequency domain data of the data blocks, the data of the non-configured subcarrier wave bands in the frequency domain data is subjected to zero setting processing, and then the time domain data is obtained by carrying out Fourier transform, so that the noise interference of subcarriers except the configured subcarriers is eliminated, the noise suppression of the orthogonal frequency division multiplexing data is realized, and the communication quality of the orthogonal frequency division multiplexing communication is improved.
Fig. 4 is a schematic diagram of an electronic device 4 according to an embodiment of the present application. As shown in fig. 4, the electronic apparatus 4 of this embodiment includes: a processor 401, a memory 402 and a computer program 403 stored in the memory 402 and executable on the processor 401. The steps of the various method embodiments described above are implemented by processor 401 when executing computer program 403. Alternatively, the processor 401 may execute the computer program 403 to implement the functions of the modules in the above-described device embodiments.
The electronic device 4 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or the like. The electronic device 4 may include, but is not limited to, a processor 401 and a memory 402. It will be appreciated by those skilled in the art that fig. 4 is merely an example of the electronic device 4 and is not limiting of the electronic device 4 and may include more or fewer components than shown, or different components.
The processor 401 may be a central processing unit (Central Processing Unit, CPU) or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like.
The memory 402 may be an internal storage unit of the electronic device 4, for example, a hard disk or a memory of the electronic device 4. The memory 402 may also be an external storage device of the electronic device 4, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the electronic device 4. Memory 402 may also include both internal storage units and external storage devices of electronic device 4. The memory 402 is used to store computer programs and other programs and data required by the electronic device.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit.
The integrated modules, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. The computer program may comprise computer program code, which may be in source code form, object code form, executable file or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A noise suppression method for an orthogonal frequency division multiplexing, OFDM, signal, the noise suppression method comprising:
dividing received orthogonal frequency division multiplexing data into data blocks with a preset first value;
performing Fourier transform on each data block to obtain a plurality of first frequency domain data;
according to preset subcarrier configuration information, assigning 0 to data at the position of an unconfigured subcarrier in the subcarrier configuration information in the plurality of first frequency domain data to obtain a plurality of second frequency domain data, wherein the subcarrier configuration information is information for configuring subcarriers to be reserved;
and carrying out inverse Fourier transform on the plurality of second frequency domain data to obtain a plurality of time domain data so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data.
2. The noise suppression method according to claim 1, wherein after obtaining the plurality of time domain data, the method further comprises: and splicing the plurality of time domain data to obtain the orthogonal frequency division multiplexing data after noise suppression.
3. The noise suppression method according to claim 1, wherein before assigning 0 to data at a subcarrier position not configured in the subcarrier configuration information in the plurality of first frequency domain data, the method further comprises: setting the subcarrier configuration information.
4. The noise suppression method according to claim 3, wherein said setting the subcarrier configuration information includes: and setting the subcarrier configuration information according to the resource block configuration data of the received orthogonal frequency division multiplexing data.
5. The noise suppression method according to claim 1, wherein the first value includes a length of a preset orthogonal frequency division multiplexing symbol, dividing the received orthogonal frequency division multiplexing data into data blocks of a preset first value, comprising:
dividing the received OFDM data according to the length of the OFDM symbol to obtain the data block.
6. The noise suppression method according to claim 1, characterized in that the size of the fourier transform and the size of the inverse fourier transform are different.
7. The noise suppression method according to any one of claims 1 to 6, wherein the first value includes any one of the following values: 1024. 2048, and 4096.
8. A noise suppression apparatus for an OFDM signal, the apparatus comprising:
the preprocessing module is used for dividing the received orthogonal frequency division multiplexing data into data blocks with the size of a preset first value;
the transformation module is used for carrying out Fourier transformation on each data block to obtain a plurality of first frequency domain data;
the processing module is used for assigning 0 to data at the position of an unconfigured subcarrier in the subcarrier configuration information in the plurality of first frequency domain data according to preset subcarrier configuration information to obtain a plurality of second frequency domain data, wherein the subcarrier configuration information is information for configuring subcarriers to be reserved;
and the inverse transformation module is used for carrying out inverse Fourier transformation on the plurality of second frequency domain data to obtain a plurality of time domain data so as to obtain orthogonal frequency division multiplexing data after noise suppression according to the plurality of time domain data.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 7.
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