CN110300080B

CN110300080B - Signal processing method and device

Info

Publication number: CN110300080B
Application number: CN201910641091.XA
Authority: CN
Inventors: 李宁; 邓中亮; 李鸣金; 杜琴; 刘姜旺; 姚坤
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-04-28
Anticipated expiration: 2039-07-16
Also published as: CN110300080A

Abstract

In the signal processing method and apparatus provided by the embodiment of the present invention, the sending end may multiply each of a plurality of identical first frequency domain signals by a corresponding phase information sequence to obtain a corresponding second frequency domain signal. And determining the sideband information sequence corresponding to the second frequency domain signal according to the corresponding relation between the preset phase information sequence and the sideband information sequence. And processing each second frequency domain signal according to the sideband information sequence corresponding to each second frequency domain signal to obtain a plurality of time domain signals, and sending the target time domain signal with the minimum peak-to-average ratio to the receiving end. After the receiving end acquires the target time domain signal sent by the sending end, the phase information sequence corresponding to the target time domain signal can be determined according to the amplitude of a plurality of complex signals contained in the frequency domain signal corresponding to the target time domain signal and the corresponding relation between the preset phase information sequence and the sideband information sequence. Based on the above processing, the waste of bandwidth resources can be reduced.

Description

Signal processing method and device

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a signal processing method and apparatus.

Background

OFDM (Orthogonal Frequency Division Multiplexing) technology has been widely adopted in high-definition television, wireless lan, and digital video broadcasting systems as a wireless communication transmission technology.

In a communication system using the OFDM technology, a transmitting end may modulate a signal to be transmitted to obtain multiple complex signals corresponding to the signal to be transmitted, and combine the multiple complex signals into a frequency domain signal, where the frequency domain signal is subjected to IFFT (Inverse fast fourier Transform) to obtain a time domain signal. Because the frequency domain signal is composed of a plurality of complex signals, when complex signals with the same phase exist in the plurality of complex signals, waveforms of the complex signals with the same phase are overlapped, so that the frequency domain signal can generate a higher instantaneous peak value, and after IFFT, the obtained time domain signal has a higher peak-to-average ratio. If the peak-to-average ratio of the transmitted time domain signal is too high, the time domain signal may generate nonlinear distortion during the transmission process, so that the receiving end may not correctly decode the signal to be transmitted sent by the sending end after receiving the time domain signal.

In the prior art, in order to enable a receiving end to correctly decode a signal to be transmitted sent by a sending end, the sending end copies a frequency domain signal corresponding to the signal to be transmitted to obtain a plurality of same frequency domain signals, then multiplies each frequency domain signal by a corresponding phase information sequence to obtain a plurality of frequency domain signals with different phase information, and after IFFT, obtains a plurality of time domain signals with different peak-to-average ratios, and then can send the time domain signal with the minimum peak-to-average ratio to the receiving end.

In addition, when the sending end sends the time domain signal with the minimum peak-to-average ratio, the sending end also needs to send the identifier of the corresponding phase information sequence to the receiving end, and the transmission of the identifier needs to occupy a certain bandwidth, which causes the waste of bandwidth resources.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a signal processing method, which can reduce the waste of bandwidth resources. The specific technical scheme is as follows:

in a first aspect, to achieve the above object, an embodiment of the present invention provides a signal processing method, where the method is applied to a transmitting end in an orthogonal frequency division multiplexing OFDM system, where the OFDM system further includes a receiving end, and the method includes:

copying frequency domain signals corresponding to signals to be transmitted to obtain a first number of same first frequency domain signals, wherein each first frequency domain signal comprises a plurality of complex signals;

for each first frequency domain signal, multiplying the first frequency domain signal by the corresponding phase information sequence to obtain a second frequency domain signal corresponding to the first frequency domain signal;

determining a sideband information sequence corresponding to the phase information sequence corresponding to the first frequency domain signal as a first sideband information sequence according to a corresponding relation between a preset phase information sequence and the sideband information sequence, wherein the sideband information sequence is used for carrying out amplitude adjustment on a complex signal contained in a frequency domain signal;

according to the first sideband information sequence, adjusting the amplitudes of a plurality of complex signals contained in a second frequency domain signal corresponding to the first frequency domain signal to obtain a corresponding third frequency domain signal;

respectively performing inverse fast Fourier transform on the obtained first number of third frequency domain signals to obtain a first number of time domain signals;

and sending the time domain signal with the minimum peak-to-average ratio in the first number of time domain signals to the receiving end, wherein the time domain signal with the minimum peak-to-average ratio is used as a target time domain signal, so that the receiving end determines a phase information sequence corresponding to the target time domain signal according to the amplitudes of a plurality of complex signals contained in the frequency domain signal corresponding to the target time domain signal and the corresponding relation between the phase information sequence and the sideband information sequence.

Optionally, the first sideband information sequence includes a plurality of binary values, and the plurality of binary values correspond to complex signals included in the second frequency domain signal one to one;

the adjusting, according to the first sideband information sequence, the amplitudes of a plurality of complex signals included in a second frequency domain signal corresponding to the first frequency domain signal to obtain a corresponding third frequency domain signal includes:

adjusting the amplitude of a first complex signal included in the second frequency domain signal according to a first preset formula, wherein the first complex signal is a complex signal corresponding to a binary value 1 included in the first sideband information sequence in the second frequency domain signal, and the first preset formula is as follows:

x represents the first complex signal, X^′Representing a complex signal obtained by amplitude adjustment of said first complex signal, E representing a first preset value.

In a second aspect, to achieve the above object, an embodiment of the present invention provides a signal processing method, where the method is applied to a receiving end in an orthogonal frequency division multiplexing OFDM system, where the OFDM system further includes a transmitting end, and the method includes:

acquiring a target time domain signal sent by the sending end, wherein the target time domain signal is a time domain signal with a minimum peak-to-average ratio, which is obtained by processing a first number of same first frequency domain signals to be transmitted by the sending end according to a corresponding relation between a preset phase information sequence and a sideband information sequence;

performing fast Fourier transform on the target time domain signal to obtain a fourth frequency domain signal corresponding to the target time domain signal;

determining a target sideband information sequence corresponding to the fourth frequency domain signal according to the amplitudes of a plurality of complex signals contained in the fourth frequency domain signal;

and determining a target phase information sequence corresponding to the target sideband information sequence according to the corresponding relation between a preset phase information sequence and the sideband information sequence.

Optionally, the determining a target sideband information sequence corresponding to the fourth frequency domain signal according to the amplitudes of multiple complex signals included in the fourth frequency domain signal includes:

judging whether the amplitude of each complex signal contained in the fourth frequency domain signal is larger than a second preset value or not;

if the amplitude of the complex signal is greater than the second preset value, taking 1 as a binary value corresponding to the complex signal in the second sideband information sequence;

if the amplitude of the complex signal is not greater than the second preset value, taking 0 as a binary value corresponding to the complex signal in the second sideband information sequence, where the second preset value is determined according to a second preset formula, and the second preset formula is:

m represents the second preset value, P represents the amplitude of the complex signal before adjustment, and E represents the first preset value;

and determining a target sideband information sequence corresponding to the fourth frequency domain signal according to the second sideband information sequence.

Optionally, the determining a target sideband information sequence corresponding to the fourth frequency domain signal according to the second sideband information sequence includes:

determining similarity between the second sideband information sequence and a plurality of preset sideband information sequences according to a third preset formula, wherein the third preset formula is as follows:

d represents the similarity of the second sideband information sequence and a preset sideband information sequence, S_nRepresenting binary values contained in the predetermined sequence of side information, N representing the number of binary values contained in said second sequence of side information, S^′ _nRepresenting binary values contained in the second sequence of side information;

and determining a target sideband information sequence corresponding to the fourth frequency domain signal according to the alternative sideband information sequence with the maximum similarity with the second sideband information sequence in the plurality of preset sideband information sequences.

Optionally, the determining, according to the alternative side information sequence with the largest similarity to the second side information sequence in the preset side information sequences, a target side information sequence corresponding to the fourth frequency-domain signal includes:

when the number of the alternative sideband information sequences is multiple, aiming at each alternative sideband information sequence, generating an alternative signal corresponding to the alternative sideband information sequence according to the binary values contained in the alternative sideband information sequence;

determining an energy difference value between a fourth frequency domain signal and an alternative signal corresponding to the alternative sideband information sequence according to a fourth preset formula, wherein the fourth preset formula is as follows:

k represents the energy difference between the fourth frequency domain signal and the alternative signal corresponding to the alternative sideband information sequence, Y_nRepresenting the amplitude, Z, of a complex signal contained in said fourth frequency domain signal_nRepresenting the amplitude of complex signals contained in the candidate signal corresponding to the candidate sideband information sequence, N representing the total number of complex signals contained in the fourth frequency domain signal;

and taking the alternative sideband information sequence corresponding to the alternative signal with the minimum energy difference value of the fourth frequency domain signal as the target sideband information sequence corresponding to the fourth frequency domain signal.

Optionally, after determining a target phase information sequence corresponding to the target side information sequence according to a preset correspondence between the phase information sequence and the side information sequence, the method further includes:

adjusting the amplitude of a second complex signal included in the fourth frequency domain signal according to a fifth preset formula to obtain a fifth frequency domain signal, where the second complex signal is a complex signal corresponding to a binary value 1 included in the target sideband information sequence in the fourth frequency domain signal, and the fifth preset formula is as follows:

y represents the second complex signal, Y^′Representing a complex signal obtained by amplitude adjustment of the second complex signal, and E representing a first preset value;

multiplying the target phase information sequence by the fifth frequency domain signal to obtain a sixth frequency domain signal corresponding to the fifth frequency domain signal;

and decoding the sixth frequency domain signal to obtain a signal to be transmitted sent by the sending end.

In a third aspect, to achieve the above object, an embodiment of the present invention provides a signal processing apparatus, where the apparatus is applied to a transmitting end in an orthogonal frequency division multiplexing OFDM system, where the OFDM system further includes a receiving end, and the apparatus includes:

the device comprises a copying module, a receiving module and a transmitting module, wherein the copying module is used for copying frequency domain signals corresponding to signals to be transmitted to obtain a first number of same first frequency domain signals, and each first frequency domain signal comprises a plurality of complex signals;

a first processing module, configured to, for each first frequency-domain signal, multiply the first frequency-domain signal by a corresponding phase information sequence to obtain a second frequency-domain signal corresponding to the first frequency-domain signal;

a matching module, configured to determine, according to a correspondence between a preset phase information sequence and a sideband information sequence, a sideband information sequence corresponding to the phase information sequence corresponding to the first frequency-domain signal, as a first sideband information sequence, where the sideband information sequence is used to perform amplitude adjustment on a complex signal included in a frequency-domain signal;

the amplitude modulation module is used for adjusting the amplitudes of a plurality of complex signals contained in a second frequency domain signal corresponding to the first frequency domain signal according to the first sideband information sequence to obtain a corresponding third frequency domain signal;

the second processing module is configured to perform inverse fast fourier transform on the obtained first number of third frequency domain signals, respectively, to obtain the first number of time domain signals;

and the sending module is used for sending the time domain signal with the minimum peak-to-average ratio in the first number of time domain signals to the receiving end, and the time domain signal with the minimum peak-to-average ratio is used as a target time domain signal, so that the receiving end determines the phase information sequence corresponding to the target time domain signal according to the amplitudes of a plurality of complex signals contained in the frequency domain signal corresponding to the target time domain signal and the corresponding relation between the phase information sequence and the sideband information sequence.

the amplitude modulation module is specifically configured to adjust an amplitude of a first complex signal included in the second frequency-domain signal according to a first preset formula, where the first complex signal is a complex signal corresponding to a binary value 1 included in the first sideband information sequence in the second frequency-domain signal, and the first preset formula is:

In a fourth aspect, to achieve the above object, an embodiment of the present invention provides a signal processing apparatus, where the apparatus is applied to a receiving end in an orthogonal frequency division multiplexing OFDM system, where the OFDM system further includes a transmitting end, and the apparatus includes:

the acquisition module is used for acquiring a target time domain signal sent by the sending end, wherein the target time domain signal is a time domain signal with the minimum peak-to-average power ratio, which is obtained by processing a first number of same first frequency domain signals to be transmitted by the sending end according to the corresponding relation between a preset phase information sequence and a sideband information sequence;

the first processing module is used for performing fast Fourier transform on the target time domain signal to obtain a fourth frequency domain signal corresponding to the target time domain signal;

a determining module, configured to determine a target sideband information sequence corresponding to the fourth frequency domain signal according to amplitudes of a plurality of complex signals included in the fourth frequency domain signal;

and the matching module is used for determining a target phase information sequence corresponding to the target sideband information sequence according to the corresponding relation between a preset phase information sequence and the sideband information sequence.

Optionally, the determining module includes:

the judgment sub-module is used for judging whether the amplitude of each complex signal contained in the fourth frequency domain signal is larger than a second preset value or not;

a first processing submodule, configured to, if the amplitude of the complex signal is greater than the second preset value, take 1 as a binary value corresponding to the complex signal in the second sideband information sequence;

a second processing sub-module, configured to, if the amplitude of the complex signal is not greater than the second preset value, take 0 as a binary value corresponding to the complex signal in the second sideband information sequence, where the second preset value is determined according to a second preset formula, and the second preset formula is:

a determining sub-module for determining a target sideband information sequence corresponding to the fourth frequency domain signal according to the second sideband information sequence.

Optionally, the determining sub-module includes:

a first determining unit, configured to determine similarity between the second side information sequence and a plurality of preset side information sequences according to a third preset formula, where the third preset formula is:

a second determining unit, configured to determine a target sideband information sequence corresponding to the fourth frequency domain signal according to an alternative sideband information sequence with a largest similarity to the second sideband information sequence in the multiple preset sideband information sequences.

Optionally, the second determining unit includes:

a generating subunit, configured to, when multiple alternative sideband information sequences are available, generate, for each alternative sideband information sequence, an alternative signal corresponding to the alternative sideband information sequence according to a binary value included in the alternative sideband information sequence;

a first determining subunit, configured to determine, according to a fourth preset formula, an energy difference between a fourth frequency-domain signal and an alternative signal corresponding to the alternative sideband information sequence, where the fourth preset formula is:

and a second determining subunit, configured to use the alternative sideband information sequence corresponding to the alternative signal with the smallest energy difference value with respect to the fourth frequency domain signal as the target sideband information sequence corresponding to the fourth frequency domain signal.

Optionally, the apparatus further comprises:

a second processing module, configured to adjust an amplitude of a second complex signal included in the fourth frequency-domain signal according to a fifth preset formula, to obtain a fifth frequency-domain signal, where the second complex signal is a complex signal in the fourth frequency-domain signal that corresponds to a binary value 1 included in the target sideband information sequence, and the fifth preset formula is:

In another aspect of the present invention, in order to achieve the above object, an embodiment of the present invention further provides an electronic device, which is characterized in that the electronic device includes a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;

a memory for storing a computer program;

a processor, configured to implement the method steps of the signal processing according to the first aspect when executing the program stored in the memory.

a memory for storing a computer program;

a processor, configured to implement the method steps of the second aspect when executing the program stored in the memory.

In another aspect of the present invention, the present invention also provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to execute the steps of the signal processing method according to the first aspect.

In yet another aspect of the present invention, the present invention further provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to execute the steps of the signal processing method according to the second aspect.

In another aspect of the present invention, there is also provided a computer program product including instructions, which when run on a computer, causes the computer to execute the signal processing method according to the first aspect.

In another aspect of the present invention, the present invention also provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the signal processing method according to the second aspect.

In the signal processing method and apparatus provided by the embodiment of the present invention, the sending end may multiply each of a plurality of identical first frequency domain signals by a corresponding phase information sequence to obtain a corresponding second frequency domain signal. And determining the sideband information sequence corresponding to the second frequency domain signal according to the corresponding relation between the preset phase information sequence and the sideband information sequence. And processing each second frequency domain signal according to the sideband information sequence corresponding to each second frequency domain signal to obtain a plurality of time domain signals, and sending the target time domain signal with the minimum peak-to-average ratio to the receiving end. After the receiving end acquires the target time domain signal sent by the sending end, the phase information sequence corresponding to the target time domain signal can be determined according to the amplitude of a plurality of complex signals contained in the frequency domain signal corresponding to the target time domain signal and the corresponding relation between the preset phase information sequence and the sideband information sequence.

Based on the above processing, both the sending end and the receiving end have a corresponding relationship between the phase information sequence and the sideband information sequence, the sending end determines the target time domain signal according to the corresponding relationship, and correspondingly, the receiving end can determine the phase information sequence corresponding to the target time domain signal according to the corresponding relationship, that is, the sending end does not need to send an identifier of the phase information sequence, and the receiving end can also determine the phase information sequence corresponding to the target time domain signal, thereby reducing the waste of bandwidth resources.

Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an architecture diagram of an OFDM system according to an embodiment of the present invention;

fig. 2 is a flowchart of a signal processing method according to an embodiment of the present invention;

fig. 3 is a flowchart of a signal processing method according to an embodiment of the present invention;

fig. 4 is a structural diagram of a signal processing apparatus according to an embodiment of the present invention;

fig. 5 is a structural diagram of a signal processing apparatus according to an embodiment of the present invention;

fig. 6 is a block diagram of an electronic device according to an embodiment of the present invention;

fig. 7 is a structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a signal processing method and a signal processing device, which can be applied to a transmitting end and a receiving end in an OFDM system.

Referring to fig. 1, fig. 1 is an architecture diagram of an OFDM system according to an embodiment of the present invention, which is a possible application scenario. The OFDM system includes: a transmitting end and a receiving end.

The sending end can copy the frequency domain signal corresponding to the signal to be transmitted to obtain a plurality of identical frequency domain signals (i.e. first frequency domain signals), multiply each first frequency domain signal with its corresponding phase information sequence respectively to obtain the frequency domain signal (i.e. second frequency domain signal) corresponding to each first frequency domain signal, according to the corresponding relation between the preset phase information sequence and the sideband information sequence, determining the sideband information sequence corresponding to each second frequency domain signal, further, according to the sideband information sequence corresponding to each second frequency domain signal, the amplitude of the complex signal included in each second frequency domain signal is adjusted to obtain a frequency domain signal (i.e. a third frequency domain signal) corresponding to each second frequency domain signal, and performing inverse fast fourier transform processing on each third frequency domain signal to obtain a plurality of time domain signals, and then sending the time domain signal with the minimum peak-to-average power ratio (namely, the target time domain signal) to the receiving end.

After receiving the target time domain signal sent by the sending end, the receiving end may perform fast fourier transform on the target time domain signal to obtain a frequency domain signal (i.e., a fourth frequency domain signal) corresponding to the target time domain signal, further determine a sideband information sequence corresponding to the target time domain signal according to amplitudes of a plurality of complex signals included in the fourth frequency domain signal, and then determine a phase information sequence corresponding to the target time domain signal according to a preset correspondence between the phase information sequence and the sideband information sequence.

Therefore, the sending end and the receiving end both have the corresponding relation between the phase information sequence and the sideband information sequence, the sending end determines the target time domain signal according to the corresponding relation, and correspondingly, the receiving end can determine the phase information sequence corresponding to the target time domain signal according to the corresponding relation, namely, the sending end does not need to send the identifier of the phase information sequence, and the receiving end can also determine the phase information sequence corresponding to the target time domain signal, so that the waste of bandwidth resources can be reduced.

Referring to fig. 2, fig. 2 is a flowchart of a signal processing method according to an embodiment of the present invention, where the method is applied to a transmitting end in an OFDM system, and the OFDM system further includes a receiving end, and the method may include the following steps:

s201: the frequency domain signals corresponding to the signals to be transmitted are copied to obtain a first number of same first frequency domain signals.

Each of the first frequency domain signals includes a plurality of complex signals. A signal to be transmitted may comprise a plurality of binary signals. The first number may be set by a skilled person based on experience, the first number may be 16, and the first number may also be 64, but is not limited thereto.

The transmitting end may modulate a binary signal included in a signal to be transmitted to obtain a plurality of complex signals corresponding to the signal to be transmitted, and perform serial-to-parallel conversion on the plurality of complex signals to obtain a frequency domain signal corresponding to the signal to be transmitted. Furthermore, the transmitting end may copy the frequency domain signal corresponding to the signal to be transmitted, so as to obtain a plurality of identical frequency domain signals (i.e., the first frequency domain signal).

In one implementation, the transmitting end may use a QPSK (Quadrature Phase Shift Keying) modulation method to modulate 2 binary signals included in a signal to be transmitted to obtain one complex signal, and further, may obtain multiple complex signals corresponding to the signal to be transmitted.

In another implementation, in order to save bandwidth resources, the transmitting end may use an 8PSK (8Phase shift keying ) modulation method to modulate 3 binary signals included in the signal to be transmitted, so as to obtain one complex signal, and further, may obtain multiple complex signals corresponding to the signal to be transmitted.

Illustratively, the first number is 3, and the modulation scheme adopted by the transmitting end is QPSK modulation. The current signals to be transmitted include: 0. 0, 1, the transmitting end can modulate 0 and 0 to obtain a complex signal a, modulate 0 and 1 to obtain a complex signal B, and similarly, can obtain complex signals C corresponding to 1 and 0, and complex signals D corresponding to 1 and 1. Then, the transmitting end may perform serial-to-parallel conversion processing on the obtained multiple complex signals (i.e., A, B, C, D), so as to obtain frequency domain signals X ═ a, B, C, and D corresponding to the signals to be transmitted. Further, the transmitting end copies the frequency domain signal to obtain 3 identical frequency domain signals: x1 ═ a, B, C, D, X2 ═ a, B, C, D, X3 ═ a, B, C, D.

S202: and for each first frequency domain signal, multiplying the first frequency domain signal by the corresponding phase information sequence to obtain a second frequency domain signal corresponding to the first frequency domain signal.

The transmitting end may have a phase information matrix, and each phase information sequence in the phase information matrix corresponds to a first number of first frequency domain signals one to one.

In one implementation, in order to effectively reduce the peak-to-average ratio of the time domain signal corresponding to the signal to be transmitted, the phase information matrix may be a Hadamard (Hadamard) matrix.

Furthermore, the transmitting end may multiply the first number of first frequency domain signals by the corresponding phase information sequences, respectively, to obtain corresponding frequency domain signals (i.e., second frequency domain signals).

Illustratively, the first number is 4, and the first frequency-domain signal includes: x1 ═ a, B, C, D, X2 ═ a, B, C, D, X3 ═ a, B, C, D, X4 ═ a, B, C, D, and the corresponding phase information sequences are: h1 ═ 1, 1, 1, 1], H2 ═ 1, -1, H3 ═ 1, 1, -1, -1, H4 ═ 1, -1, -1, 1, then the first frequency domain signal X1 is multiplied by the phase information sequence H1, and a second frequency domain signal X11 ═ a, B, C, D corresponding to X1 is obtained. Similarly, a second frequency-domain signal X22 ═ a, -B, C, -D corresponding to X2, a second frequency-domain signal X33 ═ a, B, -C, -D corresponding to X3, and a second frequency-domain signal X44 ═ a, -B, -C, D corresponding to X4 can be obtained.

S203: and determining a sideband information sequence corresponding to the phase information sequence corresponding to the first frequency domain signal as a first sideband information sequence according to the corresponding relation between the preset phase information sequence and the sideband information sequence.

Wherein the sideband information sequence is used for amplitude adjusting a complex signal contained in the frequency domain signal. The sending end has a corresponding relation between the phase information sequence and the sideband information sequence.

For example, the transmitting end has sideband information sequences in one-to-one correspondence with phase information sequences. The number of the phase information sequences is 5, and the transmitting end can generate sideband information sequences corresponding to the 5 phase information sequences one by one. In one implementation, the sending end may first generate a first sideband information sequence, and then perform cyclic shift on binary values included in the first sideband information sequence to obtain a plurality of other sideband information sequences.

In addition, in order to enable the receiving end to correctly decode the signal to be transmitted, when the transmitting end generates the sideband information sequences, the transmitting end may set a value corresponding to at most one same position in every two sideband information sequences to be 1, and then the method for determining the binary value included in the first sideband information sequence may be: the number of consecutive 0 s between every two 1 s is incremented, and the number of consecutive 0 s following the last 1 s is greater than the number of consecutive 0 s preceding the last 1 s.

Illustratively, the phase information sequence includes: h1, H2, H3, H4, H5, H6, H7, H8, the first side information sequence may be: s1 is [0, 1, 0, 0, 1, 0, 0, 0], and S2 is [0, 0, 1, 0, 0, 1, 0, 0] by circularly shifting the binary value in S1 1 time to the right; by performing a cyclic shift of the binary value in S1 2 times to the right, S3 ═ 0, 0, 0, 1, 0, 0, 1, 0], and so on, S4 ═ 0, 0, 0, 1, S5 ═ 1, 0, 0, 0, 0, 0, 1, 0, 0, S6 ═ 0, 1, 0, 0, 0, 1, 0, S7 ═ 0, 0, 0, 1, S8 ═ 1, 0, 0, 1, 0, 0, 0.

And, the sideband information sequence S1 corresponds to the phase information sequence H1; the sideband information sequence S2 corresponds to the phase information sequence H2, and so on, the sideband information sequence corresponds to the phase information sequence one-to-one. If a second frequency domain signal corresponds to a phase information sequence of H1, the second frequency domain signal corresponds to a sideband information sequence of S1 (i.e., the first sideband information sequence).

S204: and according to the first sideband information sequence, adjusting the amplitudes of a plurality of complex signals contained in a second frequency domain signal corresponding to the first frequency domain signal to obtain a corresponding third frequency domain signal.

The first sideband information sequence corresponding to the second frequency domain signal comprises a plurality of binary values, and the binary values are in one-to-one correspondence with the complex signals contained in the second frequency domain signal. The sending end can adjust the amplitude of the first complex signal contained in the second frequency domain signal according to a first preset formula and a binary value contained in the first sideband information sequence corresponding to the second frequency domain signal.

The first complex signal is a complex signal corresponding to a binary value 1 contained in the first sideband information sequence in the second frequency domain signal, and the first preset formula is as follows:

x denotes a first complex signal, X^′Representing the complex signal obtained by amplitude-adjusting the first complex signal, and E representing a first preset value. When the amplitude of the first complex signal X is adjusted according to the formula (1), an absolute value (i.e., | X |) of the first complex signal X is obtained for processing, so that the amplitude of the first complex signal X can be increased, and the receiving end can detect the amplitude-adjusted complex signal. In addition, after increasing the amplitude of the first complex signal according to | | X | + E |, it is multiplied by

Can make the amplitude adjustmentThe phase of the complex signal of (a) coincides with the phase of the first complex signal.

The first preset value may be set by a technician according to experience, for example, the first preset value may be a value obtained by taking an absolute value of the amplitude before the complex signal is adjusted, but is not limited thereto. For example, the first predetermined value may be E if a certain second frequency domain signal is X ═ a, -B]The determined sideband information sequence corresponding to the second frequency domain signal X is S ═ 0, 1]If the complex signal B included in the second frequency domain signal X is the first complex signal, the sending end may perform amplitude adjustment on the complex signal B included in the second frequency domain signal X according to formula (1), and the obtained complex signal is:

further, the frequency domain signal (i.e., the third frequency domain signal) corresponding to the second frequency domain signal may be obtained as: x^′＝[A，B^′]。

S205: and respectively carrying out fast Fourier inverse transformation on the obtained first number of third frequency domain signals to obtain a first number of time domain signals.

The method for performing IFFT on each third frequency domain signal is similar to the method for performing IFFT on the frequency domain signal in the related art, and is not described here again.

S206: and sending the time domain signal with the minimum peak-to-average ratio in the first number of time domain signals to a receiving end, wherein the time domain signal with the minimum peak-to-average ratio is used as a target time domain signal, so that the receiving end determines a phase information sequence corresponding to the target time domain signal according to the amplitudes of a plurality of complex signals contained in the frequency domain signal corresponding to the target time domain signal and the corresponding relation between the phase information sequence and the sideband information sequence.

After performing IFFT on each third frequency domain signal to obtain a plurality of time domain signals, the sending end may send the time domain signal with the smallest peak-to-average ratio to the receiving end, and correspondingly, the receiving end may determine the phase information sequence corresponding to the time domain signal according to the amplitudes of the plurality of complex signals included in the frequency domain signal corresponding to the time domain signal and the corresponding relationship between the phase information sequence and the sideband information sequence, and the processing method of the receiving end will be described in detail in the following embodiments.

Referring to fig. 3, fig. 3 is a flowchart of a signal processing method according to an embodiment of the present invention, where the method is applied to a receiving end in an OFDM system, and the OFDM system further includes a transmitting end, and the method may include the following steps:

s301: and acquiring a target time domain signal sent by a sending end.

The target time domain signal is a time domain signal with the minimum peak-to-average power ratio, which is obtained by processing a first number of same first frequency domain signals to be transmitted by a transmitting end according to the corresponding relation between a preset phase information sequence and a sideband information sequence. The processing method of the sending end can refer to the detailed description in the above embodiments.

S302: and performing fast Fourier transform on the target time domain signal to obtain a fourth frequency domain signal corresponding to the target time domain signal.

After receiving the target time domain signal, the receiving end may perform FFT (Fast fourier transform) on the target time domain signal to obtain a frequency domain signal (i.e., a fourth frequency domain signal) corresponding to the target time domain signal.

The method for performing FFT on the target time domain signal is similar to the method for performing FFT on the time domain signal in the related art, and is not described herein again.

S303: a target sideband information sequence corresponding to the fourth frequency domain signal is determined based on the amplitudes of the plurality of complex signals contained in the fourth frequency domain signal.

In one implementation, for each complex signal included in the fourth frequency domain signal, whether the amplitude of the complex signal is greater than a second preset value is determined. If the amplitude of the complex signal is larger than a second preset value, taking 1 as a binary value corresponding to the complex signal in the second sideband information sequence; otherwise, 0 is used as the binary value corresponding to the complex signal in the second sideband information sequence.

Wherein the second preset value is determined according to a second preset formula, and the second preset formula is as follows:

m represents a second predetermined value, P represents the amplitude of the complex signal before adjustment, and E represents a first predetermined value. The first preset value may be set by a technician empirically.

For example, the first preset value may be 4, the amplitude of the complex signal contained in the fourth frequency domain signal before the adjustment is 2, and the second preset value m determined according to the formula (2) is 3.

If the fourth frequency-domain signal is X ═ a, -B, the receiving end may determine whether the amplitude of the complex signal a included in the fourth frequency-domain signal is greater than a second preset value (i.e., 3). If yes, the binary value corresponding to the complex signal A contained in the fourth frequency domain signal in the second sideband information sequence is 1; otherwise, the binary value corresponding to the complex signal a contained in the fourth frequency domain signal in the second sequence of side information is 0.

Similarly, the receiving end may determine a binary value corresponding to the complex signal B included in the fourth frequency domain signal in the second sideband information sequence according to the amplitude of the complex signal B included in the fourth frequency domain signal. Further, the receiving end may determine a second sideband information sequence corresponding to the fourth frequency domain signal. A target sideband information sequence corresponding to the fourth frequency domain signal can then be determined from the second sideband information sequence.

In one implementation, the receiving end may determine the similarity between the second sideband information sequence and the plurality of preset sideband information sequences according to a third preset formula, where the third preset formula is:

d represents the similarity of the second sideband information sequence to a predetermined sideband information sequence, S_nRepresenting the binary values contained in the predetermined sequence of side information, N representing the number of binary values, S ', contained in the second sequence of side information'_nRepresenting the binary values contained in the second sequence of side information.

Illustratively, the preset sideband information sequence includes: s1 ═ 0, 1, 0, 0, S2 ═ 0, 0, 1, 0, S3 ═ 0, 0, 0, 1, S4 ═ 1, 0, 0, 0, and if the second sideband information sequence is S ' ═ 1, 0, the receiving end can calculate, according to equation (3), a similarity D1 of the second sideband information sequence S ' to the preset sideband information sequence S1 ═ 0, a similarity D2 of the second sideband information sequence S ' to the preset sideband information sequence S2, a similarity D3 of the second sideband information sequence S ' to the preset sideband information sequence S3 ═ 0, and a similarity D4 of the second sideband information sequence S ' to the preset sideband information sequence S4 ═ 1.

Then, a target sideband information sequence corresponding to the fourth frequency domain signal may be determined based on the sideband information sequence having the greatest similarity with the second sideband information sequence (i.e., the alternative sideband information sequence) among the plurality of preset sideband information sequences.

In one implementation, when there is one alternative sideband information sequence, the receiving end may directly use the alternative sideband information sequence as the target sideband information sequence corresponding to the fourth frequency domain signal.

In another implementation manner, when a plurality of alternative sideband information sequences are provided, for each alternative sideband information sequence, the receiving end may generate an alternative signal corresponding to the alternative sideband information sequence according to a binary value included in the alternative sideband information sequence.

Aiming at each complex signal contained in the alternative signal, if the complex signal corresponds to 0 in the alternative sideband information sequence corresponding to the alternative signal, setting the amplitude of the complex signal as the amplitude of the complex signal obtained by modulating the signal to be transmitted by the transmitting end; otherwise, setting the amplitude of the complex signal as the sum of the amplitude of the complex signal obtained by modulating the signal to be transmitted by the sending end and a first preset value.

Illustratively, the first preset value is E, the complex signal obtained by modulating the signal to be transmitted by the sending end is X, and the alternative sideband information sequence includes: s1 ═ 0, 0, 1, 0, S2 ═ 1, 0, 0, 0], then the candidate signal corresponding to the candidate sideband information sequence S1 may be Z1 [ | X |, | X | + E, | X | ], and the candidate signal corresponding to the candidate sideband information sequence S2 may be Z2 [ | X | + E, | X | ].

Then, an energy difference between the fourth frequency-domain signal and the candidate signal corresponding to the candidate sideband information sequence may be determined according to a fourth preset formula, where the fourth preset formula is:

k represents the energy difference between the fourth frequency domain signal and the alternative signal corresponding to the alternative sideband information sequence, Y_nRepresenting the amplitude, Z, of the complex signal contained in the fourth frequency-domain signal_nRepresenting the amplitude of the complex signals contained in the candidate signal to which the candidate sideband information sequence corresponds, and N representing the total number of complex signals contained in the fourth frequency domain signal.

Then, the candidate sideband information sequence corresponding to the candidate signal with the smallest energy difference value of the fourth frequency domain signal may be used as the target sideband information sequence corresponding to the fourth frequency domain signal.

For example, the first preset value may be 4, the amplitude of the complex signal included in the fourth frequency-domain signal before being adjusted may be 2, if the fourth frequency-domain signal is Y ═ a, -B, C, D ], the amplitude of the complex signal a is 5, the amplitude of the complex signal-B is 2, the amplitude of the complex signal C is 3, the amplitude of the complex signal D is 3, and the alternative sideband information sequence is: when S1 is ═ 0, 0, 1, 0, and S2 is [1, 0, 0, 0], then the corresponding candidate signals are: z1 ═ a, B, (C +4), D ], Z2 ═ a +4, B, C, D ], and the amplitudes of the complex signals included in candidate signal Z1 are: 2, 2, 6, 2, the amplitude of each complex signal contained in candidate signal Z2 is: 6,2,2,2.

The receiving end determines the energy difference value K1 of the fourth frequency domain signal Y with the alternative sideband information sequence Z1 to be 53 and the energy difference value K2 with the alternative sideband information sequence Z2 to be 21 according to formula (4). The receiving end may use the alternative sideband information sequence corresponding to Z2 (i.e., S2) as the target sideband information sequence corresponding to the fourth frequency domain signal.

S304: and determining a target phase information sequence corresponding to the target sideband information sequence according to the corresponding relation between the preset phase information sequence and the sideband information sequence.

After determining the target sideband information sequence corresponding to the fourth frequency domain signal, the receiving end may determine the target phase information sequence corresponding to the target sideband information sequence according to a preset correspondence between the phase information sequence and the sideband information sequence.

For example, the preset sideband information sequence may be: s1, S2, S3, S4, the preset phase information sequence may be: h1, H2, H3, H4, the preset sideband information sequences corresponding to the preset phase information sequences one-to-one, and if the determined target sideband information sequence corresponding to the fourth frequency domain signal is S2, the target phase information sequence corresponding to the target sideband information sequence is H2.

Optionally, after step S304, the method may further include the steps of: and adjusting the amplitude of the second complex signal contained in the fourth frequency domain signal according to a fifth preset formula to obtain a fifth frequency domain signal.

The second complex signal is a complex signal corresponding to a binary value 1 contained in the target sideband information sequence in the fourth frequency domain signal, and the fifth preset formula is as follows:

y represents the second complex signal, Y' represents the complex signal obtained by adjusting the amplitude of the second complex signal, E represents the first preset value, in order to make the receiving end correctly decodeWhen the amplitude of the second complex signal Y is adjusted according to the formula (5), the absolute value (i.e., Y) of the second complex signal Y is processed, so that the amplitude of the second complex signal Y can be reduced. In addition, the amplitude of the second complex signal is reduced according to | | Y | -E | and then multiplied by

The complex signal obtained by the amplitude adjustment can be made to coincide with the phase of the second complex signal.

And multiplying the target phase information sequence by the fifth frequency domain signal to obtain a sixth frequency domain signal corresponding to the fifth frequency domain signal.

After the target phase information sequence is determined, the receiving end may further perform decoding processing on the fourth frequency domain signal according to the target sideband information sequence and the target phase information sequence corresponding to the fourth frequency domain signal, so as to obtain a signal to be transmitted, which is sent by the sending end.

Illustratively, the first predetermined value is E, and if the fourth frequency-domain signal is Y ═ a, -B, C, -D ], the determined target sideband information sequence is S ═ 1, 0, and the corresponding target phase information sequence is H ═ 1, -1, -1, 1.

Then, the complex signals a and C included in the fourth frequency domain signal Y are second complex signals, and the receiving end may perform amplitude adjustment on each second complex signal (i.e., a and C) included in the fourth frequency domain signal Y according to the formula (3) and the target sideband information sequence S, to obtain complex signals:

further, the corresponding frequency domain signal (i.e., the fifth frequency domain signal) is obtained as: y '([ a', -B, C ', -D ]), and the receiving end may further multiply the target phase information sequence H with the fifth frequency-domain signal Y', and obtain a corresponding frequency-domain signal (i.e., a sixth frequency-domain signal) as: and then, the receiving end can decode the sixth frequency domain signal Y ″ to obtain a signal to be transmitted, which is sent by the sending end.

Corresponding to the embodiment of the method in fig. 2, referring to fig. 4, fig. 4 is a structural diagram of a signal processing apparatus according to an embodiment of the present invention, where the apparatus is applied to a transmitting end in an orthogonal frequency division multiplexing OFDM system, and the OFDM system further includes a receiving end, and the apparatus includes:

a copying module 401, configured to copy frequency domain signals corresponding to signals to be transmitted to obtain a first number of same first frequency domain signals, where each first frequency domain signal includes multiple complex signals;

a first processing module 402, configured to, for each first frequency-domain signal, multiply the first frequency-domain signal by a corresponding phase information sequence to obtain a second frequency-domain signal corresponding to the first frequency-domain signal;

a matching module 403, configured to determine, according to a preset correspondence between a phase information sequence and a sideband information sequence, a sideband information sequence corresponding to the phase information sequence corresponding to the first frequency-domain signal, as a first sideband information sequence, where the sideband information sequence is used to perform amplitude adjustment on a complex signal in a frequency-domain signal;

an amplitude modulation module 404, configured to adjust, according to the first sideband information sequence, amplitudes of multiple complex signals included in a second frequency domain signal corresponding to the first frequency domain signal, to obtain a corresponding third frequency domain signal;

a second processing module 405, configured to perform inverse fast fourier transform on the obtained first number of third frequency domain signals, respectively, to obtain the first number of time domain signals;

a sending module 406, configured to send the time domain signal with the smallest peak-to-average ratio among the first number of time domain signals to the receiving end, where the time domain signal with the smallest peak-to-average ratio serves as a target time domain signal, so that the receiving end determines a phase information sequence corresponding to the target time domain signal according to amplitudes of multiple complex signals included in a frequency domain signal corresponding to the target time domain signal and a corresponding relationship between the phase information sequence and a sideband information sequence.

the amplitude modulation module 404 is specifically configured to adjust an amplitude of a first complex signal included in the second frequency-domain signal according to a first preset formula, where the first complex signal is a complex signal corresponding to a binary value 1 included in the first sideband information sequence in the second frequency-domain signal, and the first preset formula is:

x represents the first complex signal, X' represents a complex signal obtained by amplitude-adjusting the first complex signal, and E represents a first preset value.

Corresponding to the embodiment of the method in fig. 3, referring to fig. 5, fig. 5 is a structural diagram of a signal processing apparatus according to an embodiment of the present invention, where the apparatus is applied to a receiving end in an orthogonal frequency division multiplexing OFDM system, and the OFDM system further includes a transmitting end, and the apparatus includes:

an obtaining module 501, configured to obtain a target time domain signal sent by the sending end, where the target time domain signal is a time domain signal with a minimum peak-to-average power ratio, which is obtained by processing a first number of same first frequency domain signals to be transmitted according to a preset correspondence between a phase information sequence and a sideband information sequence by the sending end;

a first processing module 502, configured to perform fast fourier transform on the target time domain signal to obtain a fourth frequency domain signal corresponding to the target time domain signal;

a determining module 503, configured to determine a target sideband information sequence corresponding to the fourth frequency domain signal according to the amplitudes of multiple complex signals included in the fourth frequency domain signal;

a matching module 504, configured to determine a target phase information sequence corresponding to the target sideband information sequence according to a preset correspondence between the phase information sequence and the sideband information sequence.

Optionally, the determining module 503 includes:

Optionally, the determining sub-module includes:

d represents the similarity of the second sideband information sequence and a preset sideband information sequence, S_nRepresenting the binary values contained in the predetermined sequence of side information, N representing the number of binary values, S ', contained in the second sequence of side information'_nRepresenting binary values contained in the second sequence of side information;

Optionally, the second determining unit includes:

Optionally, the apparatus further comprises:

y represents the second complex signal, Y' represents a complex signal obtained by amplitude adjustment of the second complex signal, and E represents a first preset value;

Referring to fig. 6, fig. 6 is a block diagram of an electronic device according to an embodiment of the present invention, including a processor 601, a communication interface 602, a memory 603, and a communication bus 604, where the processor 601, the communication interface 602, and the memory 603 complete communication with each other through the communication bus 604,

a memory 603 for storing a computer program;

the processor 601 is configured to implement the following steps when executing the program stored in the memory 603:

Referring to fig. 7, fig. 7 is a block diagram of an electronic device according to an embodiment of the present invention, including a processor 701, a communication interface 702, a memory 703 and a communication bus 704, where the processor 701, the communication interface 702, and the memory 703 complete mutual communication through the communication bus 704,

a memory 703 for storing a computer program;

the processor 701 is configured to implement the following steps when executing the program stored in the memory 703:

The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.

The communication interface is used for communication between the electronic equipment and other equipment.

The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.

The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.

In still another embodiment provided by the present invention, there is also provided a computer-readable storage medium having a computer program stored therein, the computer program, when executed by a processor, implementing the steps of any of the above-mentioned signal processing methods applied to the transmitting end in the OFDM system.

In still another embodiment provided by the present invention, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of any of the above-mentioned signal processing methods applied to the receiving end in the OFDM system.

In a further embodiment provided by the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps of any of the above-described signal processing methods applied to the transmitting end in the OFDM system.

In yet another embodiment of the present invention, there is also provided a computer program product containing instructions which, when run on a computer, causes the computer to perform the steps of any of the above-mentioned signal processing methods applied to a receiving end in an OFDM system.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, the electronic device, the computer-readable storage medium and the computer program product, since they are substantially similar to the method embodiments, the description is relatively simple, and in relation to them, reference may be made to the partial description of the method embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A signal processing method, applied to a transmitting end in an orthogonal frequency division multiplexing, OFDM, system, wherein the OFDM system further includes a receiving end, and the method includes:

2. The method of claim 1, wherein the first sideband information sequence comprises a plurality of binary values, and the plurality of binary values are in one-to-one correspondence with complex signals contained in the second frequency domain signal;

3. A signal processing method, applied to a receiving end in an orthogonal frequency division multiplexing, OFDM, system, wherein the OFDM system further includes a transmitting end, and the method includes:

4. The method of claim 3, wherein determining a target sequence of sideband information corresponding to the fourth frequency domain signal based on the amplitudes of a plurality of complex signals contained in the fourth frequency domain signal comprises:

5. The method of claim 4, wherein determining the target sequence of sideband information corresponding to the fourth frequency domain signal from the second sequence of sideband information comprises:

6. The method of claim 5, wherein determining the target sideband information sequence corresponding to the fourth frequency domain signal according to the candidate sideband information sequence with the greatest similarity to the second sideband information sequence of the plurality of preset sideband information sequences comprises:

7. The method according to claim 3, wherein after determining a target phase information sequence corresponding to the target side information sequence according to a preset phase information sequence and side information sequence correspondence relationship, the method further comprises:

8. A signal processing apparatus, wherein the apparatus is applied to a transmitting end in an orthogonal frequency division multiplexing, OFDM, system, and the OFDM system further includes a receiving end, and the apparatus includes:

9. A signal processing apparatus, wherein the apparatus is applied to a receiving end in an orthogonal frequency division multiplexing, OFDM, system, and the OFDM system further includes a transmitting end, and the apparatus includes:

10. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;

a memory for storing a computer program;

a processor for implementing the method steps of any of claims 1-2, or claims 3-7 when executing a program stored in a memory.