CN112202697A - Signal processing method and device, storage medium and electronic device - Google Patents
Signal processing method and device, storage medium and electronic device Download PDFInfo
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Abstract
The embodiment of the invention provides a signal processing method and device, a storage medium and an electronic device. According to the invention, a first data stream acquired in advance is modulated into a first group of subcarriers, a first target operation is performed on the first serial data stream to obtain a first group of parallel data streams, a first target processing is performed on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams, a second target operation is performed on the second group of parallel data streams to obtain a second serial data stream for data transmission, and the wavelet packet transformation is used for replacing a mode of performing signal modulation and demodulation by using Fourier transformation in an OFDM system in the prior art, so that the technical problem of low signal transmission performance in a signal transmission system can be solved, the technical effects of optimizing the signal transmission performance and eliminating ISI in channel transmission are achieved.
Description
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a signal processing method, a signal processing device, a signal processing storage medium and an electronic device.
Background
In the related art at present, a conventional OFDM technology is generally used for signal processing, and in a modulation process, a fourier transform FFT/inverse fourier transform IFFT is mainly used to implement conversion between a time domain and a frequency domain in a signal processing process, and a guard interval needs to be added in the processing process, which causes problems of low transmission rate and low spectrum utilization rate of a signal transmission system, and further causes a technical problem of affecting signal transmission performance of the signal transmission system.
Aiming at the technical problem of low signal transmission performance in a signal transmission system in the related art, no effective solution is provided at present.
Disclosure of Invention
Embodiments of the present invention provide a signal processing method, a signal processing apparatus, a storage medium, and an electronic apparatus, so as to at least solve the technical problem of low signal transmission performance in a signal transmission system in the related art.
According to an embodiment of the present invention, there is provided a signal processing method including: modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers which are mapped to Pulse Amplitude Modulation (PAM) symbols by the first data stream; executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams; performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; and executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams.
According to another embodiment of the present invention, there is provided a signal processing method including: receiving a second serial data stream sent by a first end, wherein the second serial data stream is obtained by the first end through the following method: modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers which are mapped to PAM symbols by the first data stream; executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams; performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams; executing the first target operation on the second serial data stream to obtain a third group of parallel data streams; performing second target processing on the third group of parallel data streams by using the wavelet packet function to obtain a fourth group of parallel data streams; performing the second target operation on the fourth set of parallel data streams to obtain a fourth serial data stream, so as to determine a second set of subcarriers, where the second set of subcarriers is a set of subcarriers mapped to PAM symbols by the fourth serial data stream; demodulating the second set of subcarriers into a second data stream; and sending the second data stream to the first end.
According to still another embodiment of the present invention, there is provided a signal processing apparatus including: the modulation module is used for modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers of which the first data stream is mapped to a PAM symbol; a first execution module, configured to execute a first target operation on the first serial data stream to obtain a first group of parallel data streams, where the first target operation is used to convert the serial data streams into parallel data streams; the first processing module is used for performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; a second executing module, configured to execute a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, where the second target operation is used to convert the parallel data streams into the serial data streams
According to still another embodiment of the present invention, there is provided a signal processing apparatus including: a receiving module, configured to receive a second serial data stream sent by a first end, where the second serial data stream is obtained by the first end in the following manner: modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers which are mapped to PAM symbols by the first data stream; executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams; performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams; a third execution module, configured to execute the first target operation on the second serial data stream to obtain a third set of parallel data streams; the second processing module is used for performing second target processing on the third group of parallel data streams by using the wavelet packet function to obtain a fourth group of parallel data streams; a fourth executing module, configured to execute the second target operation on the fourth set of parallel data streams to obtain a fourth serial data stream, so as to determine a second group of subcarriers, where the second group of subcarriers is a group of subcarriers mapped to PAM symbols by the fourth serial data stream; a demodulation module configured to demodulate the second set of subcarriers into a second data stream; and the sending module is used for sending the second data stream to the first end.
According to a further embodiment of the present invention, there is also provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.
According to the invention, a first data stream acquired in advance is modulated into a first group of subcarriers, wherein the first group of subcarriers is a group of subcarriers of which the first data stream is mapped to a Pulse Amplitude Modulation (PAM) symbol, a first target operation is executed on the first serial data stream to obtain a first group of parallel data streams, a first target processing is carried out on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams, a second target operation is executed on the second group of parallel data streams to obtain a second serial data stream for data transmission, and the mode of carrying out signal modulation and demodulation by using wavelet packet transformation instead of Fourier transformation in an OFDM system in the prior art is used, so that the technical problem of low signal transmission performance in a signal transmission system can be solved, the technical effects of optimizing the signal transmission performance and eliminating ISI in channel transmission are achieved.
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Fig. 1 is a block diagram of a hardware configuration of a mobile terminal according to a signal processing method of an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for processing a signal according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating another method of processing signals according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method of processing a signal according to an embodiment of the invention;
FIG. 5 is a schematic diagram of another signal processing method according to an embodiment of the invention;
FIG. 6 is a flow chart illustrating a method for processing a signal according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of yet another signal processing method according to an embodiment of the invention;
FIG. 8 is a schematic diagram of yet another signal processing method according to an embodiment of the invention;
FIG. 9 is a schematic diagram of yet another signal processing method according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in conjunction with the embodiments.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The method embodiments provided in the embodiments of the present application may be executed in a mobile terminal, a computer terminal, or a similar computing device. Taking the mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal of a signal processing method according to an embodiment of the present invention. As shown in fig. 1, the mobile terminal may include one or more (only one shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), and a memory 104 for storing data, wherein the mobile terminal may further include a transmission device 106 for communication functions and an input-output device 108. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration, and does not limit the structure of the mobile terminal. For example, the mobile terminal may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
The memory 104 may be used to store computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the signal processing method in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, so as to implement the method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
In the present embodiment, a method for processing a signal running on a mobile terminal, a computer terminal, or a similar computing device is provided, and fig. 2 is a schematic flow chart of an alternative method for processing a signal according to an embodiment of the present invention, as shown in fig. 2, the flow chart includes the following steps:
step S202, modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers of which the first data stream is mapped to a Pulse Amplitude Modulation (PAM) symbol;
step S204, executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams;
step S206, performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams;
step S208, a second target operation is performed on the second group of parallel data streams to obtain a second serial data stream for data transmission, where the second target operation is used to convert the parallel data streams into the serial data streams.
Optionally, in this embodiment, the execution main body is taken as a sending end, and the present invention is further described.
Optionally, in this embodiment, the first data stream may include, but is not limited to, a digitally encoded signal sequence of information used in data transmission, such as a binary data stream, a hexadecimal data stream, and the like.
Alternatively, in this embodiment, the first target operation can be implemented by, but not limited to, a serial-to-parallel module, which converts serial high-speed data stream information-carrying subcarriers into parallel low-speed data stream information-carrying subcarriers, and further converts the first serial data stream into a first set of parallel data streams.
Alternatively, in this embodiment, the second target operation may be implemented by, but not limited to, a parallel-to-serial module, which converts parallel low-speed data stream information-carrying subcarriers into serial high-speed data stream information-carrying subcarriers, and further converts a second set of parallel data streams into a second serial data stream.
Alternatively, in this embodiment, the second serial data stream for data transmission may be transmitted in an AWGN channel model including but not limited to additive white gaussian noise, since the AWGN channel is greatly affected by environmental noise, in a signal system, the channel has time-varying property, which may greatly affect the performance of the system, and even after passing through the channel, the system may not receive the signal or may not complete demodulation, therefore, in order to stabilize the performance of the system, it is necessary to perform channel estimation on the AWGN channel, that is, to obtain the response of the channel, perform the first target processing on the first set of parallel data streams by using a wavelet packet function to obtain the second set of parallel data streams, wherein the orthogonality of the wavelet packet function may eliminate inter-symbol interference ISI in channel transmission, and distortion may not occur by using the subcarrier function, the method has the characteristic of good stability, and the technical effects of stabilizing the system performance and improving the signal transmission efficiency can be achieved by loading the signal data stream to the subcarrier on the wavelet packet function for transmission.
According to the embodiment, a first data stream acquired in advance is modulated into a first group of subcarriers, wherein the first group of subcarriers is a group of subcarriers in which the first data stream is mapped to a Pulse Amplitude Modulation (PAM) symbol, a first target operation is performed on the first serial data stream to obtain a first group of parallel data streams, a first target processing is performed on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams, a second target operation is performed on the second group of parallel data streams to obtain a second serial data stream for data transmission, and a mode of performing signal modulation and demodulation by using wavelet packet transformation instead of using Fourier transformation in an OFDM system in the prior art is used, so that the technical problem of low signal transmission performance in a signal transmission system can be solved, the technical effects of optimizing the signal transmission performance and eliminating ISI in channel transmission are achieved.
In an alternative embodiment, performing a first target process on the first set of parallel data streams using a wavelet packet function to obtain a second set of parallel data streams includes: and carrying out inverse discrete wavelet packet transformation on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams.
Optionally, in this embodiment, the inverse discrete wavelet packet transform is performed on each parallel data in the first set of parallel data by using the wavelet packet function to obtain the second set of parallel data streams, and the inverse discrete wavelet packet transform may include, but is not limited to, an algorithm that is derived or converted by using the wavelet packet function.
FIG. 3 is a schematic diagram of an alternative signal processing method according to an embodiment of the present invention, such as that shown in FIG. 3
Decomposing to obtain
And
then will be
Is decomposed into
And
is decomposed into
And
by analogy, the signal is decomposed into a data stream comprising a high frequency part and a low frequency part, and then corresponding reconstruction is performed.
In an alternative embodiment, performing inverse discrete wavelet packet transformation on the first set of parallel data streams using a wavelet packet function to obtain a second set of parallel data streams includes: decomposing a high frequency portion of the first set of parallel data streams into a first set of high frequency subcarriers using a wavelet packet function, and decomposing a low frequency portion into a first set of low frequency subcarriers; reconstructing the first group of high-frequency sub-carriers by using a high-frequency filter to obtain a second group of high-frequency sub-carriers; reconstructing the first group of low-frequency sub-carriers by using a low-frequency filter to obtain a second group of low-frequency sub-carriers; a second set of high frequency sub-carriers and a second set of low frequency sub-carriers are determined as a second set of parallel data streams.
Optionally, in this embodiment, the first group of high frequency sub-carriers may include, but is not limited to, a high frequency sub-band obtained by down-sampling each data stream of the first group of parallel data streams after inputting the data stream into a high pass filter, and the first group of low frequency sub-carriers may include, but is not limited to, a low frequency sub-band obtained by down-sampling each data stream of the first group of parallel data streams after inputting the data stream into a low pass filter, and the wavelet packet function may include, but is not limited to, a cost function based on, for example, an information entropy function, a minimization cost function, and the like.
For example, Wavelet Packet Transform (WPT) is a generalized extension of Wavelet Transform, that is, a Wavelet Packet is decomposed and reconstructed from both high-frequency and low-frequency portions, wherein the Wavelet Packet Transform corresponds to the decomposition process, and the inverse Wavelet Packet Transform corresponds to the reconstruction process, and the decomposition and reconstruction may include, but are not limited to, performing inverse Wavelet Packet Transform (reconstruction) and then performing Wavelet Packet Transform (decomposition), or performing Wavelet Packet Transform (decomposition) and then performing inverse Wavelet Packet Transform (reconstruction). If the orthogonal scale function is phi and the wavelet function is psi, the following dual-scale equation can be obtained after the wavelet packet function is derived or converted:
wherein h iskRepresents the coefficient of a low-pass filter, and gkTo represent the high-pass filter coefficients.
The low pass filter is configured to decompose and reconstruct a low frequency portion of the third set of parallel data streams, and the high pass filter is configured to decompose and reconstruct a high frequency portion of the third set of parallel data streams.
In an optional embodiment, after performing the second target operation on the second set of parallel data streams to obtain a second serial data stream for data transmission, the method further includes: sending the second serial data stream to the second end; receiving a second data stream returned by the second end based on the second serial data stream, wherein the second data stream is obtained by the second end through the following steps: executing a first target operation on the second serial data stream to obtain a third group of parallel data streams; performing second target processing on the third group of parallel data streams by using a wavelet packet function to obtain a fourth group of parallel data streams; performing a second target operation on the fourth group of parallel data streams to obtain a fourth serial data stream so as to determine a second group of subcarriers, wherein the second group of subcarriers are a group of subcarriers of which the fourth serial data stream is mapped to the PAM symbols; the second set of subcarriers is demodulated into a second data stream.
Optionally, in this embodiment, the second end may include, but is not limited to, a terminal or a base station that receives the second serial data stream, and by receiving the second data stream returned from the second end, a complete process of modulation and demodulation of the data stream is implemented, and a technical effect of efficient and low-loss transmission of a signal is implemented.
In an optional embodiment, after receiving the second data stream returned by the second end based on the second serial data stream, the method further comprises: and comparing and analyzing the second data stream with the first data stream to obtain a target bit error rate parameter.
Optionally, in this embodiment, the target ber parameter may include, but is not limited to, a peak-to-average power ratio (PAPR), a ber (bit error rate), and the like.
In an alternative embodiment, a method for processing a signal running on a mobile terminal, a computer terminal or a similar computing device is provided, fig. 4 is a schematic flow chart of an alternative signal processing method according to an embodiment of the present invention, as shown in fig. 4, the flow chart includes the following steps:
step S402, receiving a second serial data stream sent by the first end, where the second serial data stream is obtained by the first end through the following method: modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers of which the first data stream is mapped to a PAM symbol; executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams; performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams;
step S404, executing a first target operation on the second serial data flow to obtain a third group of parallel data flows;
step S406, performing second target processing on the third group of parallel data streams by using a wavelet packet function to obtain a fourth group of parallel data streams;
step S408, a second target operation is executed on the fourth group of parallel data streams to obtain a fourth serial data stream, so as to determine a second group of subcarriers, wherein the second group of subcarriers is a group of subcarriers which are mapped to PAM symbols by the fourth serial data stream;
step S410, demodulating the second group of subcarriers into a second data stream;
step S412, sending the second data stream to the first end.
Optionally, in this embodiment, the execution main body is taken as a receiving end, and the present invention is further described.
Optionally, in this embodiment, the second data stream may include, but is not limited to, a digitally encoded signal sequence of information used in data transmission, such as a binary data stream, a hexadecimal data stream, and the like.
Alternatively, in this embodiment, the first target operation can be implemented by, but not limited to, a serial-to-parallel module, which converts serial high-speed data stream information-carrying subcarriers into parallel low-speed data stream information-carrying subcarriers, and further converts the first serial data stream into a first set of parallel data streams.
Alternatively, in this embodiment, the second target operation may be implemented by, but not limited to, a parallel-to-serial module, which converts parallel low-speed data stream information-carrying subcarriers into serial high-speed data stream information-carrying subcarriers, and further converts a second set of parallel data streams into a second serial data stream.
According to the embodiment, the demodulation of the signal modulated by the wavelet packet transform function can be realized at the receiving end, and further, the mode that the Fourier transform is used for signal modulation and demodulation in the OFDM system in the prior art is replaced, the technical problem of low signal transmission performance in a signal transmission system can be solved, and the technical effects of optimizing the signal transmission performance and eliminating ISI in channel transmission are achieved.
In an optional embodiment, performing a second target process on the third set of parallel data streams by using a wavelet packet function to obtain a fourth set of parallel data streams, including: and performing discrete wavelet transform on the third group of parallel data streams by using a wavelet packet function to obtain a fourth group of parallel data streams.
Alternatively, in the present embodiment, the discrete wavelet transform and the inverse discrete wavelet transform may be derived from each other.
Optionally, in this embodiment, the discrete wavelet packet transformation is performed on each parallel data in the third set of parallel data by using the wavelet packet function to obtain the fourth set of parallel data streams, and the discrete wavelet packet transformation may include, but is not limited to, an algorithm that is derived or converted by using the wavelet packet function.
In an alternative embodiment, performing discrete wavelet transform on the third set of parallel data streams using a wavelet packet function to obtain a fourth set of parallel data streams, including: decomposing a high-frequency part of the third group of parallel data streams into a third group of high-frequency subcarriers by using a wavelet packet function, and decomposing a low-frequency part into a third group of low-frequency subcarriers; reconstructing the third group of high-frequency sub-carriers by using a high-frequency filter to obtain a fourth group of high-frequency sub-carriers; reconstructing the second group of low-frequency sub-carriers by using a low-frequency filter to obtain a fourth group of low-frequency sub-carriers; and determining the fourth group of high-frequency sub-carriers and the fourth group of low-frequency sub-carriers as a fourth group of parallel data streams.
Optionally, in this embodiment, the first group of high frequency sub-carriers may include, but is not limited to, a high frequency sub-band obtained by down-sampling each data stream of the first group of parallel data streams after inputting the data stream into a high pass filter, and the first group of low frequency sub-carriers may include, but is not limited to, a low frequency sub-band obtained by down-sampling each data stream of the first group of parallel data streams after inputting the data stream into a low pass filter, and the wavelet packet function may include, but is not limited to, a cost function based on, for example, an information entropy function, a minimization cost function, and the like.
For example, Wavelet Packet Transform (WPT) is a generalized extension of Wavelet Transform, i.e., the decomposition and reconstruction of both high and low frequency portions of a Wavelet Packet. If the orthogonal scale function is phi and the wavelet function is psi, the following dual-scale equation can be obtained after the wavelet packet function is derived or converted:
wherein h iskRepresents the coefficient of a low-pass filter, and gkTo represent the high-pass filter coefficients.
The low pass filter is configured to decompose and reconstruct a low frequency portion of the third set of parallel data streams, and the high pass filter is configured to decompose and reconstruct a high frequency portion of the third set of parallel data streams.
In an optional embodiment, the second target operation is performed on a fourth set of parallel data streams to obtain a fourth serial data stream, so as to determine a second set of subcarriers, and the method further includes: performing channel estimation and channel equalization on the fourth group of parallel data streams to obtain a fifth group of parallel data streams, wherein the fifth group of parallel data streams are parallel data streams with noise removed; and executing a second target operation on the fifth group of parallel data streams to obtain a fifth serial data stream so as to determine a third group of subcarriers, wherein the third group of subcarriers is a group of subcarriers which are mapped to PAM (pulse amplitude modulation) symbols by the fifth serial data stream.
Alternatively, in this embodiment, noise included in the fourth set of parallel data streams may be removed by performing channel estimation and channel equalization, for example, white gaussian noise included in the fourth set of parallel data streams is removed.
The invention is further illustrated below with reference to specific examples:
in an alternative embodiment, the PAM-WPT system is improved over conventional OFDM technology by replacing the FFT (Fast Fourier Transform)/IFFT (Inverse Fast Fourier Transform) of the OFDM system with the DWT (Discrete Wavelet Transform)/IDWT (Inverse Discrete Wavelet Transform) contained in the Wavelet Transform.
Therefore, PAM-WPT maintains all the advantages of the conventional OFDM system, such as high frequency spectrum, ISI (Inter-Symbol Interference) reduction and elimination, dynamic resource allocation, effective multipath Interference resistance, etc., and for the conventional OFDM, the PAPR (Peak-to-Average Power Ratio) of the system is high, which affects the performance of the system because the transmission rate and the spectrum utilization rate of the system are low due to the need to add a guard interval. For a WPT (Wavelet Packet Transform) system, frequency offset can be avoided by using orthogonality of a Wavelet Packet function, the technical problems of low transmission efficiency and low security faced by OFDM can be solved, the transmission rate of a transmission system can be improved, and the security of the system can also be increased.
For PAM-WPT system, at the transmitting end, binary data stream is mapped to PAM symbol, and serial high speed sub-carrier carrying data stream information is converted into parallel low speed data by serial-parallel module.
Because an AWGN (Additive White Gaussian Noise channel) channel is greatly affected by environmental Noise, in a system, the channel has time-varying property, which may greatly affect the performance of the system, even after passing through the channel, a receiving end of the system cannot receive a signal or cannot complete demodulation, in order to stabilize the performance of the system, it is necessary to perform channel estimation on the AWGN channel, that is, calculate the response of the channel, a general system usually adopts blind channel estimation, in which a pilot signal needs to be inserted before each symbol at a transmitting end, and then, after passing through the channel, the time-domain response performance of the channel may be calculated.
In the embodiment, CP (Cyclic prefix) does not need to be added in the PAM-WPT system, ISI can be eliminated by utilizing orthogonality of the wavelet packet function, and distortion does not occur in the subcarrier function, so that the wavelet packet function has good stability.
When a signal (corresponding to the first parallel data stream) is input into the IWPT module, the signal data stream may be loaded onto the subcarriers of the wavelet packet function for transmission, where the subcarriers exhibit an orthogonality relationship, and it should be noted that when the low-frequency filter and the high-frequency filter are reconstructed, the optimal wavelet function is selected. The aggregate transmission of the signals (corresponding to the aforementioned second target operation) is performed by the parallel-to-serial module, and the resulting PAM-WPT signal (corresponding to the aforementioned second serial data stream) is transmitted over the AWGN channel.
At the receiving end, the PAM-WPT signal (corresponding to the aforementioned second serial data stream) is first converted into parallel signal transmission (corresponding to the aforementioned first target operation) by the serial-parallel module, and the signal is demodulated at the WPT module. The demodulated signal is subjected to channel estimation and equalization, and the aggregate transmission of the signal is performed by the parallel-serial module (corresponding to the aforementioned second target operation). And finally, PAM demodulation is carried out on the signals, and the recovered bit stream data is compared and analyzed with the most original binary bit stream of the transmitting end to obtain the error rate performance of the whole PAM-WPT system. The decomposition and reconstruction of the expandable high frequency part, i.e. both in the low and high frequency part, can be achieved by using wavelet packet transforms. The wavelet packet function is used for transmitting information for the carrier, and meanwhile, the carrier has time-frequency domain locality. Wavelet packet modulation has a great advantage over fourier transforms in dealing with non-stationary signals. In the fourier transform, because the instability of the exponential function can cause some ISI, the wavelet packet function has locality in the time-frequency domain, and the signal can be extracted at a certain time. There are also many advantages in configuring subcarrier modulation, the number of subcarriers can be allocated from the used channel to transmit different rates.
Fig. 5 is a structural diagram of an alternative transmitting and receiving apparatus according to an embodiment of the present invention, as shown in fig. 5, for example, a binary data stream is input into a serial/parallel module of a transmitting end 502, modulated by using a wavelet packet transform function, and then the parallel data stream is collected and transmitted to a receiving end 504 through a transmitting channel, and the receiving end 504 decomposes the received serial data stream into a plurality of parallel data streams, and then performs corresponding superposition and integration, and then outputs the serial data stream through the parallel/serial module;
in the process shown in fig. 5, the multicarrier baseband signal modulated by the wavelet packet may be represented as:
in the above formula
Representing the digital signal transmitted in the channel,
Γ represents a set of ordered pairs (l, m) of wavelet packet functions, and the scale and center frequency index of the wavelet packet functions are represented by l and m, respectively.
Fig. 6 is a schematic diagram of an alternative transmission and reception process according to an embodiment of the present invention, where the process includes the following steps:
the operation steps performed in the transmitting end (corresponding to the aforementioned first end) include:
s602, inputting a binary data stream;
s604, mapping the binary data stream to a symbol to complete PAM modulation;
s606, converting the serial data stream on the PAM symbol into a parallel data stream;
s608, inserting pilot for the parallel data stream;
s610, inverse discrete wavelet packet transformation is carried out on the parallel data stream after the pilot frequency is inserted;
s612, converting the parallel data stream after the inverse discrete wavelet packet transformation into a serial data stream;
s614, sending the serial data stream on AWGN;
the operation steps performed in the receiving end (corresponding to the aforementioned second end) include:
s616, converting the received serial data stream into a parallel data stream;
s618, discrete wavelet packet transformation is carried out on the parallel data stream;
s620, channel equalization is carried out on the parallel data flow after the discrete wavelet packet transformation;
s622, converting the parallel data stream after channel equalization into a serial data stream;
s624, demodulating the serial data stream on the PAM symbol into a second data stream;
s626, outputting the second data stream.
It should be noted that fig. 7 is a schematic diagram of another alternative signal processing method according to an embodiment of the present invention, and the bit error rates of the 2PAM-WPT system and the 4QAM-OFDM system in the AWGN channel are as shown in fig. 7, which shows that the bit error rate performance gap between the 2PAM-WPT system and the 4QAM-OFDM system is smaller, but the Bit Error Rate (BER) corresponding to any signal-to-noise ratio (SNR) of the 2PAM-WPT system is better than that of the 4QAM-OFDM system.
Fig. 8 is a schematic diagram of another alternative signal processing method according to an embodiment of the present invention, and the error rates of the 4PAM-WPT system and the 16QAM-OFDM system in the AWGN channel are as shown in fig. 8, where the 4PAM-DWT system has a more significant downward trend compared to the 16QAM-OFDM system, that is, the error rate performance of the PAM-DWT system is better. In the case of a low signal-to-noise ratio, the noise is mainly concentrated in the high frequency part, and when the wavelet packet signal is decomposed, the high frequency noise is decomposed. Under the condition of high signal-to-noise ratio, noise in the system is reduced, some noise can be ignored for the high-frequency part of the 4PAM-WPT system, and the simulation result of the 4PAM-WPT system is obviously superior to that of the 16QAM-OFDM system. Log2N
In addition, theoretically, the peak-to-average ratio (PAPR) and the number of subcarriers satisfy the formula: PAPR is 10lgN, where N is the number of subcarriers. Fig. 9 is a schematic diagram of another alternative signal processing method according to an embodiment of the present invention, and a relationship between subcarriers of a 4PAM-WPT system and a PAPR and a relationship between subcarriers of a 16QAM-OFDM system and a PAPR may be as shown in fig. 9, where as N increases, superposition between subcarriers of two systems or phases between different subcarriers may be consistent, which may generate a large peak, and for the QAM-OFDM system, the probability of occurrence of the maximum peak-to-average ratio is greater, so the maximum peak-to-average ratio may not be obtained every time. From the simulation results, the PAPR range of the PAM-WPT system is mainly between 6 to 8.5dB, and the PAPR range of the QAM-OFDM system is mainly between 6.5 to 10dB, so the PAPR of the QAM-OFDM system is generally larger than that of the PAM-WPT system, further illustrating that the performance of the PAM-WPT system is better than that of the QAM-OFDM system. The performance of the system can be improved by utilizing the advantages of wavelet analysis, and the PAPR growth rate of the PAM-WPT system is obviously lower than that of the QAM-OFDM system along with the increase of the number of subcarriers, so that the inhibition effect of the PAM-WPT system on the peak-to-average power ratio is better.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a signal processing apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details are not repeated after the description is given. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 10 is a block diagram of an alternative signal processing apparatus according to an embodiment of the present invention, as shown in fig. 10, the apparatus including:
a modulation module 1002, configured to modulate a first data stream acquired in advance into a first group of subcarriers, where the first group of subcarriers is a group of subcarriers in which the first data stream is mapped to a PAM symbol;
a first executing module 1004, configured to execute a first target operation on the first serial data stream to obtain a first group of parallel data streams, where the first target operation is used to convert the serial data streams into parallel data streams;
a first processing module 1006, configured to perform a first target processing on the first group of parallel data streams by using a wavelet packet function, so as to obtain a second group of parallel data streams;
a second executing module 1008, configured to execute a second target operation on a second set of parallel data streams to obtain a second serial data stream for data transmission, where the second target operation is used to convert the parallel data streams into the serial data streams
In an alternative embodiment, the first processing module 1006 includes: and the first processing unit is used for carrying out inverse discrete wavelet packet transformation on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams.
In an alternative embodiment, the first processing unit comprises: a decomposition subunit, configured to decompose a high-frequency portion of the first group of parallel data streams into a first group of high-frequency subcarriers using a wavelet packet function, and decompose a low-frequency portion into a first group of low-frequency subcarriers; the first reconstruction subunit is used for reconstructing the first group of high-frequency subcarriers by using a high-frequency filter to obtain a second group of high-frequency subcarriers; the second reconstruction subunit is used for reconstructing the first group of low-frequency subcarriers by using the low-frequency filter to obtain a second group of low-frequency subcarriers; a determining subunit, configured to determine the second group of high frequency subcarriers and the second group of low frequency subcarriers as a second group of parallel data streams.
In an alternative embodiment, the apparatus is further configured to: after a second target operation is executed on a second group of parallel data streams to obtain a second serial data stream for data transmission, the second serial data stream is sent to a second end; receiving a second data stream returned by the second end based on the second serial data stream, wherein the second data stream is obtained by the second end through the following steps: executing a first target operation on the second serial data stream to obtain a third group of parallel data streams; performing second target processing on the third group of parallel data streams by using a wavelet packet function to obtain a fourth group of parallel data streams; performing a second target operation on the fourth group of parallel data streams to obtain a fourth serial data stream so as to determine a second group of subcarriers, wherein the second group of subcarriers are a group of subcarriers of which the fourth serial data stream is mapped to the PAM symbols; the second set of subcarriers is demodulated into a second data stream.
In an alternative embodiment, the apparatus is further configured to: and after receiving a second data stream returned by the second end based on the second serial data stream, comparing and analyzing the second data stream and the first data stream to obtain a target bit error rate parameter.
According to still another embodiment of the present invention, there is provided a signal processing apparatus including: a receiving module, configured to receive a second serial data stream sent by the first end, where the second serial data stream is obtained by the first end in the following manner: modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers of which the first data stream is mapped to a PAM symbol; executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams; performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams; the third execution module is used for executing the first target operation on the second serial data stream to obtain a third group of parallel data streams; the second processing module is used for carrying out second target processing on the third group of parallel data streams by using a wavelet packet function to obtain a fourth group of parallel data streams; a fourth executing module, configured to execute a second target operation on the fourth set of parallel data streams to obtain a fourth serial data stream, so as to determine a second group of subcarriers, where the second group of subcarriers is a group of subcarriers in which the fourth serial data stream is mapped to the PAM symbol; a demodulation module, configured to demodulate the second group of subcarriers into a second data stream; and the sending module is used for sending the second data stream to the first end.
In an optional embodiment, the second processing module is configured to perform second target processing on the third set of parallel data streams by using a wavelet packet function to obtain a fourth set of parallel data streams: and performing discrete wavelet transform on the third group of parallel data streams by using a wavelet packet function to obtain a fourth group of parallel data streams.
In an optional embodiment, the second processing module is configured to perform discrete wavelet transform on the third set of parallel data streams using a wavelet packet function to obtain a fourth set of parallel data streams by: decomposing a high-frequency part of the third group of parallel data streams into a third group of high-frequency subcarriers by using a wavelet packet function, and decomposing a low-frequency part into a third group of low-frequency subcarriers; reconstructing the third group of high-frequency sub-carriers by using a high-frequency filter to obtain a fourth group of high-frequency sub-carriers; reconstructing the second group of low-frequency sub-carriers by using a low-frequency filter to obtain a fourth group of low-frequency sub-carriers; and determining the fourth group of high-frequency sub-carriers and the fourth group of low-frequency sub-carriers as a fourth group of parallel data streams.
In an alternative embodiment, the apparatus is further configured to: performing a second target operation on the fourth group of parallel data streams to obtain a fourth series data stream so as to determine a second group of subcarriers, and performing channel estimation and channel equalization on the fourth group of parallel data streams to obtain a fifth group of parallel data streams, wherein the fifth group of parallel data streams are parallel data streams with noise removed; and executing a second target operation on the fifth group of parallel data streams to obtain a fifth serial data stream so as to determine a third group of subcarriers, wherein the third group of subcarriers is a group of subcarriers of which the fifth serial data stream is mapped to the PAM symbols.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the steps of any of the above-mentioned method embodiments when executed.
In the present embodiment, the above-mentioned computer-readable storage medium may be configured to store a computer program for executing the steps of:
s1, modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers which are mapped to Pulse Amplitude Modulation (PAM) symbols by the first data stream;
s2, performing a first target operation on the first serial data stream to obtain a first group of parallel data streams, where the first target operation is used to convert the serial data streams into parallel data streams;
s3, performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams;
and S4, performing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams.
The computer readable storage medium is further arranged to store a computer program for performing the steps of:
s1, modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers which are mapped to Pulse Amplitude Modulation (PAM) symbols by the first data stream;
s2, performing a first target operation on the first serial data stream to obtain a first group of parallel data streams, where the first target operation is used to convert the serial data streams into parallel data streams;
s3, performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams;
and S4, performing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams.
In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
In an exemplary embodiment, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
In an exemplary embodiment, the processor may be configured to execute the following steps by a computer program:
s1, modulating a first data stream acquired in advance into a first group of subcarriers, wherein the first group of subcarriers are a group of subcarriers which are mapped to Pulse Amplitude Modulation (PAM) symbols by the first data stream;
s2, performing a first target operation on the first serial data stream to obtain a first group of parallel data streams, where the first target operation is used to convert the serial data streams into parallel data streams;
s3, performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams;
and S4, performing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams.
For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary embodiments, and details of this embodiment are not repeated herein.
It will be apparent to those skilled in the art that the various modules or steps of the invention described above may be implemented using a general purpose computing device, they may be centralized on a single computing device or distributed across a network of computing devices, and they may be implemented using program code executable by the computing devices, such that they may be stored in a memory device and executed by the computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into various integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method of processing a signal, comprising:
mapping a first data stream acquired in advance to a Pulse Amplitude Modulation (PAM) symbol to modulate the first data stream into a first group of subcarriers, wherein the first group of subcarriers comprise a first serial data stream;
executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams;
performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams;
and executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams.
2. The method of claim 1, wherein the performing a first target process on the first set of parallel data streams using a wavelet packet function to obtain a second set of parallel data streams comprises:
and carrying out inverse discrete wavelet packet transformation on the first group of parallel data streams by using the wavelet packet function to obtain a second group of parallel data streams.
3. The method of claim 2, wherein performing an inverse discrete wavelet packet transform on the first set of parallel data streams using a wavelet packet function to obtain the second set of parallel data streams comprises:
decomposing a high-frequency part of the first group of parallel data streams into a first group of high-frequency subcarriers by using the wavelet packet function, and decomposing a low-frequency part into a first group of low-frequency subcarriers, wherein each subcarrier in the first group of high-frequency subcarriers has an orthogonality relation with each other;
reconstructing the first group of high-frequency sub-carriers by using a high-frequency filter to obtain a second group of high-frequency sub-carriers;
reconstructing the first group of low-frequency sub-carriers by using a low-frequency filter to obtain a second group of low-frequency sub-carriers;
determining the second set of high frequency sub-carriers and the second set of low frequency sub-carriers as the second set of parallel data streams.
4. The method of claim 1, wherein after performing a second target operation on the second set of parallel data streams to obtain a second serial data stream for data transmission, the method further comprises:
sending the second serial data stream to a second end;
receiving a second data stream returned by the second end based on the second serial data stream, wherein the second data stream is obtained by the second end by:
executing the first target operation on the second serial data stream to obtain a third group of parallel data streams; performing second target processing on the third group of parallel data streams by using the wavelet packet function to obtain a fourth group of parallel data streams; executing the second target operation on the fourth group of parallel data streams to obtain a fourth serial data stream so as to determine a second group of subcarriers, wherein the second group of subcarriers are a group of subcarriers modulated after the fourth serial data stream is mapped to PAM symbols; demodulating the second set of subcarriers into a second data stream.
5. The method of claim 4, wherein after receiving a second data stream returned by the second end based on the second serial data stream, the method further comprises:
and comparing and analyzing the second data stream and the first data stream to obtain a target bit error rate parameter.
6. A method of processing a signal, comprising:
receiving a second serial data stream sent by a first end, wherein the second serial data stream is obtained by the first end through the following method: mapping a first data stream acquired in advance to a Pulse Amplitude Modulation (PAM) symbol to modulate the first data stream into a first group of subcarriers, wherein the first group of subcarriers comprise a first serial data stream; executing a first target operation on the first serial data stream to obtain a first group of parallel data streams, wherein the first target operation is used for converting the serial data streams into the parallel data streams; performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams; executing a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, wherein the second target operation is used for converting the parallel data streams into the serial data streams;
executing the first target operation on the second serial data stream to obtain a third group of parallel data streams;
performing second target processing on the third group of parallel data streams by using the wavelet packet function to obtain a fourth group of parallel data streams;
executing the second target operation on the fourth group of parallel data streams to obtain a fourth serial data stream so as to determine a second group of subcarriers, wherein the second group of subcarriers is a group of subcarriers modulated after the fourth serial data stream is mapped to PAM symbols;
demodulating the second set of subcarriers into a second data stream;
and sending the second data stream to the first end.
7. The method of claim 6, wherein performing a second target processing on the third set of parallel data streams using a wavelet packet function to obtain a fourth set of parallel data streams comprises:
and performing discrete wavelet transform on the third group of parallel data streams by using the wavelet packet function to obtain the fourth group of parallel data streams.
8. The method of claim 7, wherein the performing a discrete wavelet transform on the third set of parallel data streams using the wavelet packet function to obtain the fourth set of parallel data streams comprises:
decomposing a high frequency portion of the third set of parallel data streams into a third set of high frequency sub-carriers and a low frequency portion into a third set of low frequency sub-carriers using the wavelet packet function;
reconstructing the third group of high-frequency sub-carriers by using a high-frequency filter to obtain a fourth group of high-frequency sub-carriers;
reconstructing the second group of low-frequency sub-carriers by using a low-frequency filter to obtain a fourth group of low-frequency sub-carriers;
determining the fourth set of high frequency sub-carriers and the fourth set of low frequency sub-carriers as the fourth set of parallel data streams.
9. The method of claim 6, wherein performing the second target operation on the fourth set of parallel data streams results in a fourth serial data stream to determine a second set of subcarriers, the method further comprising:
performing channel estimation and channel equalization on the fourth group of parallel data streams to obtain a fifth group of parallel data streams, wherein the fifth group of parallel data streams are parallel data streams with noise removed;
and executing the second target operation on the fifth group of parallel data streams to obtain a fifth serial data stream so as to determine a third group of subcarriers, wherein the third group of subcarriers is a group of subcarriers modulated after the fifth serial data stream is mapped to PAM symbols.
10. An apparatus for processing a signal, comprising:
the modulation module is used for mapping a first data stream acquired in advance to a Pulse Amplitude Modulation (PAM) symbol to modulate the first data stream into a first group of subcarriers, wherein the first group of subcarriers comprise a first serial data stream;
a first execution module, configured to execute a first target operation on the first serial data stream to obtain a first group of parallel data streams, where the first target operation is used to convert the serial data streams into parallel data streams;
the first processing module is used for performing first target processing on the first group of parallel data streams by using a wavelet packet function to obtain a second group of parallel data streams;
and a second executing module, configured to execute a second target operation on the second group of parallel data streams to obtain a second serial data stream for data transmission, where the second target operation is used to convert the parallel data streams into the serial data streams.
11. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 5 when executed, or to perform the method of any of claims 6 to 9.
12. An electronic apparatus comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 5 or to perform the method of any of claims 6 to 9.
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| CN106302294A (en) * | 2016-08-26 | 2017-01-04 | 北京邮电大学 | A kind of signal modulation, demodulation method and device |
| CN108965185A (en) * | 2017-05-26 | 2018-12-07 | 中国移动通信集团公司 | A kind of method and device of hybrid modulation and demodulation multicarrier |
| CN110620742A (en) * | 2018-06-19 | 2019-12-27 | 意法半导体发展有限责任公司 | Method for limiting the level of a modulated signal received by a tag and corresponding limiter |
| CN109889262A (en) * | 2019-03-13 | 2019-06-14 | 苏州大学 | A kind of orthogonal frequency division multiplexing free space optical communication method based on wavelet transformation |
| CN110808933A (en) * | 2019-11-08 | 2020-02-18 | 江苏科技大学 | Index modulation underwater acoustic multi-carrier communication method based on wavelet packet transformation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022068194A1 (en) * | 2020-09-30 | 2022-04-07 | 浙江三维通信科技有限公司 | Signal processing method and apparatus, and storage medium and electronic apparatus |
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| CN112202697B (en) | 2023-03-21 |
| WO2022068194A1 (en) | 2022-04-07 |
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