CN109962875B - Signal processing method, signal processing device and storage medium - Google Patents
Signal processing method, signal processing device and storage medium Download PDFInfo
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- CN109962875B CN109962875B CN201711408907.1A CN201711408907A CN109962875B CN 109962875 B CN109962875 B CN 109962875B CN 201711408907 A CN201711408907 A CN 201711408907A CN 109962875 B CN109962875 B CN 109962875B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3872—Compensation for phase rotation in the demodulated signal
Abstract
The embodiment of the application provides a signal processing method, a signal processing device and a storage medium. The method comprises the following steps: carrying out phase recovery processing on a received transmission signal to obtain a modulation signal after phase recovery, and dividing the modulation signal after phase recovery into a first modulation signal and a second modulation signal, wherein the mean value of constellation points of the first modulation signal is positioned on the coordinate axis of a constellation diagram corresponding to the first modulation signal, and the mean value of constellation points of the second modulation signal is positioned in a quadrant of the constellation diagram corresponding to the first modulation signal; further, the first modulation signal is subjected to expansion processing to obtain a third modulation signal, and the second modulation signal is subjected to compression processing to obtain a fourth modulation signal; and further, generating a compensation modulation signal according to the third modulation signal and the fourth modulation signal, and decoding the compensation modulation signal. The embodiment of the application can compensate the cost brought by soft differential decoding in the 8PSK system and improve the SNR of signal transmission.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal processing method, an apparatus, and a storage medium.
Background
With the development of network technology, long distance and high bandwidth utilization ratio become two major characteristics of backbone networks and metropolitan area optical networks. Since 8Phase Shift keying (8 PSK) system has higher bandwidth utilization than Quadrature Phase Shift Keying (QPSK) system and has longer transmission distance than Quadrature Amplitude Modulation (16 QAM) system, 8PSK system becomes the main system used by backbone network and metropolitan area light.
In general, since phase noise of a transmission signal is continuously accumulated during transmission, constellation information of the transmission signal is rotated. Therefore, the receiving end device usually needs to perform Phase recovery processing on the received transmission signal, but a Phase jump (Phase Slip) occurs during the Phase recovery processing. In the existing 8PSK system, a soft differential decoding process is usually adopted to solve the problem of phase jump.
However, the soft differential decoding process in the existing 8PSK system amplifies NOISE, resulting in a low SIGNAL-to-NOISE RATIO (SNR) for SIGNAL transmission.
Disclosure of Invention
Embodiments of the present application provide a signal processing method, an apparatus, and a storage medium, which can compensate for a cost caused by soft differential decoding in an 8PSK system, and improve an SNR of signal transmission.
In a first aspect, an embodiment of the present application provides a signal processing method, including:
carrying out phase recovery processing on the received transmission signal to obtain a modulation signal after phase recovery;
dividing the phase-recovered modulation signal into a first modulation signal and a second modulation signal; the constellation point mean value of the first modulation signal is positioned on the coordinate axis of a constellation diagram corresponding to the first modulation signal, and the constellation point mean value of the second modulation signal is positioned in a quadrant of the constellation diagram corresponding to the first modulation signal;
carrying out expansion processing on the first modulation signal to obtain a third modulation signal;
compressing the second modulation signal to obtain a fourth modulation signal;
and generating a compensation modulation signal according to the third modulation signal and the fourth modulation signal, and decoding the compensation modulation signal to obtain a decoded signal.
In the embodiment of the signal processing method provided by the first aspect, before performing soft differential decoding, constellation separation (i.e., signal division) is performed on a modulation signal after phase recovery in advance, then constellation shaping processing (i.e., expansion processing or compression processing) is performed on the modulation signal obtained after separation, respectively, so that edge constellation points in a constellation diagram corresponding to the modulation signal obtained after separation shrink towards the mean direction of the constellation points, and constellation combination is performed on the modulation signal after constellation shaping processing to generate a compensation modulation signal, and then soft differential decoding processing and the like are performed on the compensation modulation signal, so that costs caused by soft differential decoding in an 8PSK system can be compensated, and an SNR of signal transmission is improved.
In one possible implementation, dividing the phase-recovered modulated signal into a first modulated signal and a second modulated signal includes:
dividing the modulation signal after phase recovery into a first modulation signal and a second modulation signal according to a preset constellation diagram and a hard decision method; wherein, the preset constellation diagram includes: four constellation points respectively located on four coordinate axes of the preset constellation diagram, and four constellation points respectively located in four quadrants of the preset constellation diagram.
In a possible implementation manner, spreading the first modulated signal to obtain a third modulated signal includes:
and respectively carrying out expansion processing on the real part and the imaginary part of the first modulation signal to obtain a third modulation signal.
In the embodiment of the signal processing method provided by the implementation manner, the real part and the imaginary part of the first modulation signal are respectively expanded, so that the edge constellation points in the constellation diagram corresponding to the first modulation signal shrink towards the direction of the mean value of the constellation points, thereby obtaining a third modulation signal, so that the third modulation signal and a fourth modulation signal obtained by compression processing are subsequently subjected to constellation combination to generate a compensation modulation signal, and further the compensation modulation signal is subjected to soft differential decoding processing and the like, thereby compensating the cost brought by the soft differential decoding in the 8PSK system, and improving the SNR of signal transmission.
In a possible implementation manner, the spreading processing is performed on the real part and the imaginary part of the first adjustment signal, respectively, to obtain a third modulation signal, and the method includes:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein, the first formula is
x 1 Representing the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for a sign function, λ 1 Represents the spreading factor, λ 1 ＞1。
In a possible implementation manner, the spreading processing is performed on the real part and the imaginary part of the first adjustment signal, respectively, to obtain a third modulation signal, and the method includes:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein the second formula is
x 1 Represents the real part of the first modulated signal, correspondingly y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for sign function.
In a possible implementation manner, compressing the second modulation signal to obtain a fourth modulation signal includes:
and respectively compressing the real part and the imaginary part of the second modulation signal to obtain a fourth modulation signal.
In the embodiment of the signal processing method provided by the implementation manner, the real part and the imaginary part of the second modulation signal are respectively compressed, so that the edge constellation points in the constellation diagram corresponding to the second modulation signal shrink towards the mean direction of the constellation points, and a fourth modulation signal is obtained, so that the fourth modulation signal and a third modulation signal obtained through expansion processing are subsequently subjected to constellation combination to generate a compensation modulation signal, and then soft differential decoding processing and the like are performed on the compensation modulation signal, so that the cost caused by soft differential decoding in an 8PSK system can be compensated, and the SNR of signal transmission is improved.
In a possible implementation manner, the compressing the real part and the imaginary part of the second modulation signal respectively to obtain a fourth modulation signal includes:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula three to obtain a fourth modulation signal;
wherein the third formula is
x 2 Representing the real part of the second modulated signal, y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, respectively y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for a sign function, λ 2 Represents the compression factor, λ 2 ＜1。
In a possible implementation manner, the compressing the real part and the imaginary part of the second modulation signal respectively to obtain a fourth modulation signal includes:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula IV to obtain a fourth modulation signal;
wherein the formula four is
x 2 Represents the real part of the second modulated signal, correspondingly y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, respectively y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for sign function.
In one possible implementation, the decoding process for the compensation modulation signal includes:
and respectively carrying out soft differential decoding, modulation decoding and FEC decoding on the compensation modulation signal.
In a second aspect, an embodiment of the present application provides a signal processing apparatus, including:
the first processing module is used for carrying out phase recovery processing on the received transmission signal to obtain a modulation signal after phase recovery;
the dividing module is used for dividing the modulated signal after phase recovery into a first modulated signal and a second modulated signal; the constellation point mean value of the first modulation signal is positioned on the coordinate axis of the constellation diagram corresponding to the first modulation signal, and the constellation point mean value of the second modulation signal is positioned in the quadrant of the constellation diagram corresponding to the first modulation signal;
the second processing module is used for carrying out expansion processing on the first modulation signal to obtain a third modulation signal;
the third processing module is used for compressing the second modulation signal to obtain a fourth modulation signal;
the generating module is used for generating a compensation modulation signal according to the third modulation signal and the fourth modulation signal;
and the fourth processing module is used for decoding the compensation modulation signal to obtain a decoded signal.
In a possible implementation manner, the dividing module is specifically configured to:
dividing the modulation signal after phase recovery into a first modulation signal and a second modulation signal according to a preset constellation diagram and a hard decision method; wherein, the preset constellation diagram includes: four constellation points respectively located on four coordinate axes of the preset constellation diagram, and four constellation points respectively located in four quadrants of the preset constellation diagram.
In a possible implementation manner, the second processing module is specifically configured to: and respectively carrying out expansion processing on the real part and the imaginary part of the first modulation signal to obtain a third modulation signal.
In a possible implementation manner, the second processing module is specifically configured to:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein, the first formula is
x 1 Representing the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for a sign function, λ 1 Represents the spreading factor, λ 1 ＞1。
In a possible implementation manner, the second processing module is specifically configured to:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein the second formula is
x 1 Represents the real part of the first modulated signal, correspondingly y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for sign function.
In a possible implementation manner, the third processing module is specifically configured to: and respectively compressing the real part and the imaginary part of the second modulation signal to obtain a fourth modulation signal.
In a possible implementation manner, the third processing module is specifically configured to:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula three to obtain a fourth modulation signal;
wherein the third formula is
x 2 Represents the real part of the second modulated signal, correspondingly y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, respectively y 2 An imaginary component representing the fourth modulated signal; sgn () stands for a sign function, λ 2 Represents the compression factor, λ 2 ＜1。
In a possible implementation manner, the third processing module is specifically configured to:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula IV to obtain a fourth modulation signal;
wherein the formula four is
x 2 Representing the real part of the second modulated signal, y 2 Represents the real part of the fourth modulated signal; or, x 2 Representing the second modulated signalImaginary part of, correspondingly, y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for sign function.
In a possible implementation manner, the fourth processing module is specifically configured to: and respectively carrying out soft differential decoding, modulation decoding and FEC decoding on the compensation modulation signal.
The beneficial effects of the signal processing apparatus provided in the implementation manner of the second aspect may refer to the beneficial effects brought by the implementation manner of the first aspect, and are not described herein again.
In a third aspect, an embodiment of the present application provides a signal processing apparatus, including: a processor and a memory;
wherein the memory is adapted to store instructions and the processor is adapted to execute the instructions stored by the memory, and when the processor executes the instructions stored by the memory, the signal processing apparatus is adapted to perform the method of the first aspect.
In a fourth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement the method of the first aspect. Alternatively, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
In a fifth aspect, an embodiment of the present application provides a program, which when executed by a processor is configured to perform the method of the first aspect.
In a sixth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.
In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where instructions are stored, and when the instructions are executed on a computer, the instructions cause the computer to perform the method of the first aspect.
Drawings
Fig. 1A is a schematic diagram of signal transmission in an 8PSK system provided in the related art;
fig. 1B is a schematic diagram of a constellation diagram of a transmission signal before soft differential decoding provided by the related art;
fig. 1C is a schematic diagram of a constellation diagram of a transmission signal after soft differential decoding provided by the related art;
fig. 1D is a schematic diagram illustrating transmission performance of soft differential decoding and hard differential decoding provided in the related art;
fig. 2A is a schematic flowchart of a signal processing method according to an embodiment of the present application;
fig. 2B is another schematic flow chart of a signal processing method according to an embodiment of the present disclosure;
fig. 2C is a schematic diagram of a constellation diagram of a third modulation signal provided in an embodiment of the present application;
fig. 2D is a schematic diagram of a constellation diagram of a fourth modulation signal provided in an embodiment of the present application;
fig. 3A is a schematic flowchart of a signal processing method according to another embodiment of the present application;
fig. 3B is a schematic diagram of transmission performance of soft differential decoding provided by an embodiment of the present application, soft differential decoding provided by a related art, and hard differential decoding provided by a related art;
fig. 4 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a signal processing apparatus according to another embodiment of the present application.
Detailed Description
First, a signal transmission process and a partial word in the 8PSK system related to the related art will be explained.
Fig. 1A is a schematic diagram of signal transmission in an 8PSK system provided in the related art. As shown in fig. 1A, a sending end device obtains a transmission signal by sequentially performing Forward Error Correction (FEC) coding, 8PSK coding, soft differential coding, digital to Analog Converter (DAC), transmitter Optical Subassembly (TOSA) and other processing (of course, other processing may be included, which is not limited in this embodiment of the present invention) on a data bit to be transmitted, and transmits the transmission signal through an Optical fiber channel. Further, the receiving end device sequentially passes through a Receiver Optical Subassembly (ROSA), an Analog-to-Digital Converter (ADC), phase recovery, soft differential decoding, 8PSK decoding, and FEC decoding on the received transmission signal (of course, other processing may be included, which is not limited in this embodiment of the present invention). Wherein the phase recovery may comprise: clock recovery, dispersion compensation (CDC), constant Mode Algorithm (CMA), frequency offset and phase offset estimation, and clock phase detection error; of course, the phase recovery may also include other processes, which are not limited in the embodiments of the present application.
For specific implementation manners of processing such as ROSA, ADC, phase recovery, soft differential decoding, 8PSK decoding, FEC decoding, and the like in the receiving end device in the embodiment of the present application, reference may be made to implementation manners in the related art, which is not limited in the embodiment of the present application.
Fig. 1B is a schematic diagram of a constellation of a transmission signal before soft differential decoding provided by the related art, fig. 1C is a schematic diagram of a constellation of a transmission signal after soft differential decoding provided by the related art, and fig. 1D is a schematic diagram of transmission performance of soft differential decoding and hard differential decoding provided by the related art (in fig. 1D, I represents a transmission performance curve without soft differential decoding, II represents a transmission performance curve with hard differential decoding, and III represents a transmission performance curve with soft differential decoding provided by the related art). Wherein, I In FIGS. 1B-1C represents In-Phase, and Q represents Quadrature; e in FIG. 1D b /N 0 Representing the Ratio of energy per Bit to noise power spectral density, and BER represents the Bit Error probability (Bit Error Ratio). As shown in fig. 1B-1D, the soft differential decoding process in the existing 8PSK system amplifies noise, resulting in a lower SNR of the signal transmission (e.g., 2.3dB compared to the cost of hard differential decoding).
It should be noted that SNR refers to the ratio of symbol energy to noise energy, E b /N 0 Refers to the ratio of bit energy to noise energy, SNR, and E b /N 0 The relationship between them is related to the modulation format. Illustratively, the SNR is equal to E when one symbol represents one bit b /N 0 (ii) a SNR = E when one symbol represents M (an integer greater than 1) bits b /N 0 +10*log 10 M。
The signal processing method, the signal processing device and the storage medium provided by the embodiment of the application can be applied to an 8PSK system; of course, the method can also be applied to signal transmission processes in other systems, and this is not limited in the embodiment of the present application. It should be noted that, in this embodiment, a signal transmission process in the 8PSK system is taken as an example for description, and when the method is applied to other systems, the process in the 8PSK system may be referred to, and details are not described in this embodiment.
With reference to fig. 1A, in the signal processing method, the signal processing apparatus, and the storage medium provided in this embodiment of the present application, before performing the soft differential decoding process, constellation separation (i.e., signal division) is performed on the modulation signals after phase recovery in advance, then constellation shaping processes (i.e., expansion processes or compression processes) are performed on the modulation signals obtained after separation, and the modulation signals after the constellation shaping processes are subjected to constellation combination to generate compensation modulation signals, and then the soft differential decoding process, the 8PSK decoding, the FEC decoding, and the like are performed on the compensation modulation signals, so that the technical problem that the SNR of signal transmission in the existing 8PSK system is low can be solved.
In the embodiment of the present application, the apparatus for executing the signal processing method may be a receiving end device, or may be a signal processing apparatus in the receiving end device. For example, the signal processing device in the receiving end device may be a chip system, a circuit, a module, or the like, and the application is not limited thereto.
The receiving end device in the embodiment of the present application may be an optical module or the like, and certainly may also be other devices having a signal processing function, which is not limited in the embodiment of the present application.
The following describes the technical solution of the present application and how to solve the above technical problems in detail by specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2A is a schematic flowchart of a signal processing method according to an embodiment of the present application, fig. 2B is another schematic flowchart of the signal processing method according to the embodiment of the present application, fig. 2C is a schematic diagram of a constellation diagram of a third modulation signal according to the embodiment of the present application, and fig. 2D is a schematic diagram of a constellation diagram of a fourth modulation signal according to the embodiment of the present application. As shown in fig. 2A, the method of the embodiment of the present application may include:
step S201, performs phase recovery processing on the received transmission signal to obtain a phase-recovered modulation signal.
In this step, after receiving the transmission signal, for example, the received transmission signal may be subjected to ROSA, ADC and phase recovery processing to obtain a phase-recovered modulation signal; of course, the received transmission signal may be subjected to other processing before being subjected to the phase recovery processing, which is not limited in the embodiment of the present application.
Step S202, the phase-recovered modulation signal is divided into a first modulation signal and a second modulation signal.
In this step, a first modulation signal and a second modulation signal are obtained by performing constellation separation on the modulation signal after phase recovery; alternatively, the first modulation signal and/or the second modulation signal referred to in the embodiments of the present application may be Quadrature Phase Shift Keying (QPSK) signals. As shown in fig. 2B, the mean value of the constellation points of the first modulation signal is located on the coordinate axis of the constellation diagram corresponding to the first modulation signal (e.g., at least one point of 011, 000, 101, and 110), and the mean value of the constellation points of the second modulation signal is located in the quadrant of the constellation diagram corresponding to the first modulation signal (e.g., at least one point of 001, 100, 111, and 010).
Illustratively, according to a preset constellation diagram and a hard decision method, dividing a phase-recovered modulation signal into a first modulation signal and a second modulation signal; as shown in fig. 2B, the preset constellation diagram may include: four constellation points (e.g., 011, 000, 101, and 110) located on four coordinate axes of the predetermined constellation, and four constellation points (e.g., 001, 100, 111, and 010) located in four quadrants of the predetermined constellation.
Optionally, the closest constellation point in the eight constellation points (or referred to as decision points) of the preset constellation diagram to each phase-recovered modulation signal in the preset duration is determined every preset duration, for example, the distance between the phase-recovered modulation signal 1 and the constellation point 011 is closest, the distance between the phase-recovered modulation signal 2 and the constellation point 000 is closest, the distance between the phase-recovered modulation signal 3 and the constellation point 101 is closest, the distance between the phase-recovered modulation signal 4 and the constellation point 111 is closest, and the distance between the phase-recovered modulation signal 5 and the constellation point 001 are closest. Further, each phase-recovered modulation signal (e.g., phase-recovered modulation signal 1, phase-recovered modulation signal 2, and phase-recovered modulation signal 3) respectively closest to a constellation point (e.g., 011, 000, 101, and 110) on four coordinate axes of the preset constellation is assigned to the first modulation signal, and each phase-recovered modulation signal (e.g., phase-recovered modulation signal 4 and phase-recovered modulation signal 5) respectively closest to a constellation point (e.g., 001, 100, 111, and 010) in four quadrants of the preset constellation is assigned to the second modulation signal.
Optionally, a constellation point closest to each phase-recovered modulation signal in the variable time length from among eight constellation points (or referred to as decision points) of a preset constellation diagram may also be determined; furthermore, the modulation signals which are respectively recovered from the phases and are closest to the constellation points on the four coordinate axes of the preset constellation map are assigned to the first modulation signal, and the modulation signals which are respectively recovered from the phases and are respectively closest to the constellation points in the four quadrants of the preset constellation map are assigned to the second modulation signal.
Of course, according to the preset constellation diagram and the hard decision method, the modulation signal after phase recovery may also be divided into the first modulation signal and the second modulation signal in other manners, which is not limited in the embodiment of the present application.
Of course, the phase-recovered modulation signal may be divided into the first modulation signal and the second modulation signal by other manners, which is not limited in the embodiment of the present application.
It should be noted that, if the signal processing method, the apparatus, and the storage medium provided in the embodiment of the present application are applied to an 8PSK system, the modulated signal after phase recovery may refer to an 8PSK signal, and/or the preset constellation may refer to an 8PSK constellation; if the signal processing method, the device and the storage medium provided by the embodiment of the application are applied to an 8QAM system, the modulation signal after phase recovery may refer to an 8QAM signal, and/or the preset constellation may refer to an 8QAM constellation; of course, the signal processing method, the signal processing apparatus, and the storage medium provided in the embodiments of the present application may also be applied to other systems, which are not described herein again.
Step S203, performing spreading processing on the first modulation signal to obtain a third modulation signal.
In order to reduce or avoid errors occurring in the soft differential decoding process, in this step, the first modulation signal is subjected to spreading processing to inwardly concentrate each data which is prone to errors in the soft differential decoding process, so as to obtain a third modulation signal. Illustratively, the real part and the imaginary part of the first modulation signal may be respectively subjected to spreading processing to obtain a third modulation signal, as shown in fig. 2C; for example, the real part of the first modulation signal is spread to obtain the real part (e.g., a) of the third modulation signal, and the imaginary part of the first modulation signal is spread to obtain the imaginary part (e.g., B) of the third modulation signal, so that the third modulation signal (e.g., a + j × B) is obtained according to the real part of the third modulation signal and the imaginary part of the third modulation signal.
Optionally, the implementation manners of performing spreading processing on the real part and the imaginary part of the first modulation signal respectively to obtain the third modulation signal may include at least the following:
the first realizable way: and respectively carrying out expansion processing on the real part and the imaginary part of the first modulation signal according to a formula to obtain a third modulation signal.
Wherein, the first formula is
x 1 Representing the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, correspondingly y 1 Represents the imaginary part of the third modulated signal; sgn () stands for a sign function, λ 1 Represents the spreading factor, λ 1 ＞1。
In this implementation manner, the real part of the first modulation signal is expanded according to the formula to obtain the real part of the third modulation signal, and the imaginary part of the first modulation signal is expanded according to the formula to obtain the imaginary part of the third modulation signal, so that the third modulation signal is obtained according to the real part of the third modulation signal and the imaginary part of the third modulation signal.
Of course, the real part and the imaginary part of the first modulation signal may also be expanded according to other modifications of the first formula or equivalent formulas, respectively, to obtain the third modulation signal, which is not limited in this embodiment of the application.
The second realizable way is as follows: and respectively carrying out expansion processing on the real part and the imaginary part of the first modulation signal according to a formula to obtain a third modulation signal.
Wherein the second formula is
x 1 Representing the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for sign function.
In this implementation manner, the real part of the first modulation signal is expanded according to the formula to obtain the real part of the third modulation signal, the imaginary part of the first modulation signal is expanded according to the formula to obtain the imaginary part of the third modulation signal, and thus the third modulation signal is obtained according to the real part of the third modulation signal and the imaginary part of the third modulation signal
Of course, the real part and the imaginary part of the first modulation signal may also be expanded according to other deformation of the second formula or an equivalent formula, respectively, to obtain a third modulation signal, which is not limited in this embodiment of the application.
Of course, the real part and the imaginary part of the first modulation signal may also be respectively expanded through other realizable manners to obtain the third modulation signal, which is not limited in the embodiment of the present application.
And step S204, compressing the second modulation signal to obtain a fourth modulation signal.
In order to reduce or avoid errors occurring in the soft differential decoding process, in this step, the second modulation signal is compressed to inwardly concentrate each data which is prone to errors in the soft differential decoding process, so as to obtain a fourth modulation signal. For example, the real part and the imaginary part of the second modulation signal may be compressed separately to obtain a fourth modulation signal, as shown in fig. 2D; for example, compressing the real part of the second modulation signal results in a real part (e.g., C) of the fourth modulation signal, and compressing the imaginary part of the second modulation signal results in an imaginary part (e.g., D) of the fourth modulation signal, such that the fourth modulation signal (e.g., C + j × D) is derived from the real part of the fourth modulation signal and the imaginary part of the fourth modulation signal.
Optionally, the implementation manner of obtaining the fourth modulation signal by respectively compressing the real part and the imaginary part of the second modulation signal may include at least the following:
the first realizable mode is as follows: and respectively compressing the real part and the imaginary part of the second modulation signal according to a formula III to obtain a fourth modulation signal.
Wherein the third formula is
x 2 Representing the real part of the second modulated signal, y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, correspondingly y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for a sign function, λ 2 Represents the compression factor, λ 2 ＜1。
In this implementation manner, the real part of the second modulation signal is compressed according to the formula three to obtain the real part of the fourth modulation signal, and the imaginary part of the second modulation signal is compressed according to the formula three to obtain the imaginary part of the fourth modulation signal, so that the fourth modulation signal is obtained according to the real part of the fourth modulation signal and the imaginary part of the fourth modulation signal.
Of course, the real part and the imaginary part of the second modulation signal may also be compressed according to other deformation of the second formula or an equivalent formula, respectively, to obtain the fourth modulation signal, which is not limited in this embodiment of the application.
The second realizable way is as follows: and respectively compressing the real part and the imaginary part of the second modulation signal according to a formula IV to obtain a fourth modulation signal.
Wherein the formula four is
x 2 Representing the real part of the second modulated signal, y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, respectively y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for sign function. />
In this implementation manner, the real part of the second modulation signal is compressed according to the formula four to obtain the real part of the fourth modulation signal, and the imaginary part of the second modulation signal is compressed according to the formula four to obtain the imaginary part of the fourth modulation signal, so that the fourth modulation signal is obtained according to the real part of the fourth modulation signal and the imaginary part of the fourth modulation signal.
Of course, the real part and the imaginary part of the second modulation signal may also be compressed according to other variants of the formula four or an equivalent formula, respectively, to obtain a fourth modulation signal, which is not limited in this embodiment of the application.
Of course, the real part and the imaginary part of the second modulation signal may also be compressed respectively in other realizable manners to obtain the fourth modulation signal, which is not limited in the embodiment of the present application.
And step S205, generating a compensation modulation signal according to the third modulation signal and the fourth modulation signal, and decoding the compensation modulation signal to obtain a decoded signal.
In this step, constellation merging is performed according to the third modulation signal and the fourth modulation signal to obtain a compensation modulation signal. Illustratively, the real part (e.g., a + C) of the compensation modulation signal is derived from the real part (e.g., a) of the third modulation signal and the real part (e.g., C) of the fourth modulation signal, and the imaginary part (e.g., B + D) of the compensation modulation signal is derived from the imaginary part (e.g., B) of the third modulation signal and the imaginary part (e.g., D) of the fourth modulation signal, thereby deriving the compensation modulation signal (e.g., (a + C) + j (B + D)) from the real part of the compensation modulation signal and the imaginary part of the compensation modulation signal. Further, the compensation modulated signal is decoded, for example, including but not limited to at least one of the following: soft differential decoding, modulation decoding and FEC decoding; alternatively, the compensation modulated signal may be soft differential decoded, modulation decoded, and FEC decoded, respectively, in sequence.
It can be seen that, by performing constellation separation on the phase-recovered modulation signal in advance before performing the soft differential decoding processing (for example, dividing the phase-recovered modulation signal into a first modulation signal and a second modulation signal); secondly, constellation shaping processing is respectively carried out on the modulation signals obtained after separation (for example, a third modulation signal is obtained by carrying out expansion processing on the first modulation signal and a fourth modulation signal is obtained by carrying out compression processing on the second modulation signal), so that edge constellation points (constellation points with different errors) in a constellation diagram corresponding to the first modulation signal and the second modulation signal respectively shrink towards the mean direction of the constellation points (the shrunk constellation points are not easy to make errors); furthermore, the third modulation signal and the fourth modulation signal are subjected to constellation combination to generate a compensation modulation signal, and then the compensation modulation signal is subjected to soft differential decoding processing, modulation decoding, FEC decoding and the like, so that the cost caused by soft differential decoding in the 8PSK system can be compensated, and the SNR of signal transmission is improved.
It should be noted that, if the signal processing method, the apparatus, and the storage medium provided in the embodiment of the present application are applied to an 8PSK system, the modulation decoding may refer to 8PSK decoding; if the signal processing method, the signal processing device and the storage medium provided by the embodiment of the application are applied to an 8QAM system, modulation decoding may refer to 8QAM decoding; of course, the signal processing method, the signal processing apparatus, and the storage medium provided in the embodiments of the present application may also be applied to other systems, which are not described herein again.
In the embodiment of the application, a modulation signal after phase recovery is obtained by performing phase recovery processing on a received transmission signal, and the modulation signal after phase recovery is divided into a first modulation signal and a second modulation signal, wherein a constellation point mean value of the first modulation signal is located on a coordinate axis of a constellation diagram corresponding to the first modulation signal, and a constellation point mean value of the second modulation signal is located in a quadrant of the constellation diagram corresponding to the first modulation signal; further, the first modulation signal is subjected to expansion processing to obtain a third modulation signal, and the second modulation signal is subjected to compression processing to obtain a fourth modulation signal; and further, generating a compensation modulation signal according to the third modulation signal and the fourth modulation signal, and decoding the compensation modulation signal to obtain a decoded signal. It can be seen that, before performing the soft differential decoding processing, the constellation separation is performed on the modulation signal after the phase recovery in advance, then the constellation shaping processing is performed on the modulation signal obtained after the separation respectively, so that the edge constellation points in the constellation diagram corresponding to the modulation signal obtained after the separation shrink towards the mean direction of the constellation points, the modulation signal after the constellation shaping processing is subjected to constellation combination to generate a compensation modulation signal, and then the soft differential decoding processing and the like are performed on the compensation modulation signal, so that the cost brought by the soft differential decoding in the 8PSK system can be compensated, and the SNR of signal transmission is improved.
Fig. 3A is a schematic flowchart of a signal processing method according to another embodiment of the present application. Based on the above embodiments, the embodiments of the present application take the application to an 8PSK system as an example, and a detailed description is given to a specific process of a signal processing method.
As shown in fig. 3A, 1) performs phase recovery processing on the received transmission signal to obtain a phase-recovered modulation signal (e.g., 8PSK signal 1).
2) And according to a hard decision method, carrying out constellation separation on the modulated signal (such as 8PSK signal 1) after phase recovery to obtain a first modulated signal (such as QPSK signal 1) and a second modulated signal (such as QPSK signal 2).
3) And respectively performing expansion processing on the real part Re1 and the imaginary part Im1 of the first modulation signal to obtain a third modulation signal (for example, A + j × B), so that an edge constellation point in a constellation diagram corresponding to the first modulation signal is contracted towards the mean direction of the constellation points.
Illustratively, the cells are ventilated according to sgn (Re 1) | Re1 1.4 Obtaining a real part A of the third modulation signal and calculating the amount of non-woven cells according to sgn (Im 1) | Im1 1.4 Obtaining the imaginary part B of the third modulation signal, i.e. performing the spreading process according to the formula one, lambda 1 ＝1.4。
4) And respectively compressing the real part Re2 and the imaginary part Im2 of the second modulation signal to obtain a fourth modulation signal (for example, C + j × D) so as to enable edge constellation points in a constellation diagram corresponding to the second modulation signal to shrink towards the mean direction of the constellation points.
Illustratively, the cells are ventilated according to sgn (Re 2) | Re2 0.6 Obtaining a real part C of the fourth modulation signal and calculating the amount of non-woven fabric based on sgn (Im 2) | Im2 0.6 Obtaining the imaginary part D of the fourth modulation signal, i.e. performing compression processing according to the above formula three, lambda 2 ＝0.6。
5) And carrying out constellation combination according to the third modulation signal and the fourth modulation signal to obtain a compensation modulation signal (such as 8PSK signal 2). Optionally, the compensation modulation signal is equal to (a + C) + j (B + D), e.g. equal to (sgn (Re 1) | Re1| 1.4 +sgn(Re2)*|Re2| 0.6 )+j*(sgn(Im1)*|Im1| 1.4 +sgn(Im2)*|Im2| 0.6 )。
6) And decoding the compensation modulation signal to obtain a decoded signal. Alternatively, the compensation modulated signal may be soft differential decoded, modulation decoded, and FEC decoded, respectively, in sequence.
Fig. 3B is a schematic diagram of transmission performance of soft differential decoding provided by the embodiment of the present application, soft differential decoding provided by the related art, and hard differential decoding (in fig. 3B, I represents a transmission performance curve without soft differential decoding, II represents a transmission performance curve with hard differential decoding, III represents a transmission performance curve with soft differential decoding provided by the related art, and IV represents a transmission performance curve with soft differential decoding provided by the embodiment of the present application). As shown in fig. 3B, in the signal processing process provided in the embodiment of the present application, constellation separation, constellation shaping, and constellation combination are performed in advance before the soft differential decoding provided in the embodiment of the present application, so that the cost caused by the soft differential decoding process can be eliminated, and the SNR of signal transmission is improved.
It should be noted that, for specific implementation manners of each step in the embodiments of the present application, reference may be made to relevant contents in the above embodiments, and details are not described here.
In the embodiment of the application, before the soft differential decoding processing is performed, constellation separation is performed on the modulation signal after the phase recovery in advance to obtain a first modulation signal and a second modulation signal, and then constellation shaping processing is performed on the first modulation signal and the second modulation signal respectively to obtain a third modulation signal and a fourth modulation signal, so that an edge constellation point in a constellation diagram corresponding to the first modulation signal is contracted towards the mean direction of the constellation point thereof and an edge constellation point in a constellation diagram corresponding to the second modulation signal is contracted towards the mean direction of the constellation point thereof; furthermore, the third modulation signal and the fourth modulation signal are subjected to constellation combination to generate a compensation modulation signal, and then the compensation modulation signal is subjected to soft differential decoding processing and the like, so that the cost caused by soft differential decoding in an 8PSK system can be compensated, and the SNR of signal transmission is improved.
Fig. 4 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present application. As shown in fig. 4, the signal processing apparatus 40 provided in the present embodiment may include:
a first processing module 401, configured to perform phase recovery processing on a received transmission signal to obtain a phase-recovered modulation signal;
a dividing module 402, configured to divide the phase-recovered modulation signal into a first modulation signal and a second modulation signal; the constellation point mean value of the first modulation signal is positioned on the coordinate axis of the constellation diagram corresponding to the first modulation signal, and the constellation point mean value of the second modulation signal is positioned in the quadrant of the constellation diagram corresponding to the first modulation signal;
a second processing module 403, configured to perform spreading processing on the first modulation signal to obtain a third modulation signal;
a third processing module 404, configured to perform compression processing on the second modulation signal to obtain a fourth modulation signal;
a generating module 405, configured to generate a compensation modulation signal according to the third modulation signal and the fourth modulation signal;
and a fourth processing module 406, configured to perform decoding processing on the compensation modulation signal to obtain a decoded signal.
Optionally, the dividing module 402 is specifically configured to:
dividing the modulation signal after phase recovery into a first modulation signal and a second modulation signal according to a preset constellation diagram and a hard decision method; wherein, the preset constellation diagram includes: four constellation points respectively located on four coordinate axes of the preset constellation diagram, and four constellation points respectively located in four quadrants of the preset constellation diagram.
Optionally, the second processing module 403 is specifically configured to: and respectively carrying out expansion processing on the real part and the imaginary part of the first modulation signal to obtain a third modulation signal.
Optionally, the second processing module 403 is specifically configured to:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein, the formula one is
x 1 Representing the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for a sign function, λ 1 Represents the spreading factor, λ 1 ＞1。
Optionally, the second processing module 403 is specifically configured to:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein the second formula is
x 1 Representing the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulated signal, respectively y 1 Represents the imaginary part of the third modulated signal; sgn () stands for sign function.
Optionally, the third processing module 404 is specifically configured to: and respectively compressing the real part and the imaginary part of the second modulation signal to obtain a fourth modulation signal.
Optionally, the third processing module 404 is specifically configured to:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula three to obtain a fourth modulation signal;
wherein the third formula is
x 2 Represents the real part of the second modulated signal, correspondingly y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, respectively y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for a sign function, λ 2 Represents the compression factor, λ 2 ＜1。
Optionally, the third processing module 404 is specifically configured to:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula IV to obtain a fourth modulation signal;
wherein the formula four is
x 2 Represents the real part of the second modulated signal, correspondingly y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of the second modulated signal, respectively y 2 Represents the imaginary part of the fourth modulated signal; sgn () stands for sign function.
Optionally, the fourth processing module 406 is specifically configured to: and respectively carrying out soft differential decoding, modulation decoding and FEC decoding on the compensation modulation signal.
The signal processing apparatus of this embodiment may be configured to execute the technical solution of the signal processing method embodiment of this application, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 5 is a schematic structural diagram of a signal processing apparatus according to another embodiment of the present application. As shown in fig. 5, the signal processing apparatus 50 provided in the embodiment of the present application may include: a processor 501 and a memory 502;
the memory 502 is configured to store instructions, the processor 501 is configured to execute the instructions stored in the memory 502, and when the processor 501 executes the instructions stored in the memory 502, the signal processing apparatus is configured to execute the technical solution of the foregoing signal processing method embodiment of the present application, which has similar implementation principles and technical effects, and is not described herein again.
It will be appreciated that fig. 5 only shows a simplified design of the signal processing means. In other embodiments, the signal processing apparatus may further include any number of transmitters, receivers, processors, memories, and/or communication units, and the like, which are not limited in this embodiment.
The embodiment of the present application further provides a chip system, where the chip system includes a processor and may further include a memory, and is used to implement the technical solution of the signal processing method embodiment of the present application, and the implementation principle and the technical effect are similar, and are not described herein again. Alternatively, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
The embodiments of the present application further provide a program, where the program is used to execute the technical solution of the embodiments of the signal processing method in the present application when executed by a processor, and the implementation principle and the technical effect are similar, and are not described herein again.
The embodiments of the present application further provide a computer program product including instructions, which when run on a computer, enables the computer to execute the technical solution of the embodiments of the signal processing method of the present application, and the implementation principle and the technical effect are similar, and are not described herein again.
The embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is enabled to execute the technical solution of the embodiment of the signal processing method in the present application, and the implementation principle and the technical effect of the embodiment are similar, and are not described herein again.
The processors referred to in the embodiments of the present application may be general purpose processors, digital signal processors, application specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
The memory related to the embodiment of the present application may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example, a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
It should be understood by those of ordinary skill in the art that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the sequence of execution, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
In the above embodiments, all or part of the implementation may be 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 application 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.
Claims (20)
1. A signal processing method, comprising:
carrying out phase recovery processing on the received transmission signal to obtain a modulation signal after phase recovery;
dividing the phase-recovered modulation signal into a first modulation signal and a second modulation signal; the constellation point mean value of the first modulation signal is located on the coordinate axis of the constellation diagram corresponding to the first modulation signal, and the constellation point mean value of the second modulation signal is located in the quadrant of the constellation diagram corresponding to the first modulation signal;
carrying out expansion processing on the first modulation signal to obtain a third modulation signal;
compressing the second modulation signal to obtain a fourth modulation signal;
and generating a compensation modulation signal according to the third modulation signal and the fourth modulation signal, and decoding the compensation modulation signal to obtain a decoded signal.
2. The method of claim 1, wherein the dividing the phase-recovered modulated signal into a first modulated signal and a second modulated signal comprises:
dividing the phase-recovered modulation signal into the first modulation signal and the second modulation signal according to a preset constellation diagram and a hard decision method; wherein, the preset constellation diagram includes: the constellation point detection method comprises the following steps of four constellation points respectively located on four coordinate axes of the preset constellation diagram, and four constellation points respectively located in four quadrants of the preset constellation diagram.
3. The method according to claim 1 or 2, wherein the spreading the first modulated signal to obtain a third modulated signal comprises:
and respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal to obtain a third modulation signal.
4. The method of claim 3, wherein the spreading the real part and the imaginary part of the first modulated signal separately to obtain a third modulated signal comprises:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein, the formula one is
x 1 Represents the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of said first modulated signal, respectively y 1 Represents an imaginary part of the third modulation signal; sgn () stands for a sign function, λ 1 Represents the spreading factor, λ 1 ＞1。
5. The method of claim 3, wherein the spreading the real part and the imaginary part of the first modulation signal respectively to obtain the third modulation signal comprises:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein the second formula is
x 1 Represents the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of said first modulated signal, respectively y 1 Represents an imaginary part of the third modulation signal; sgn () stands for sign function.
6. The method according to any one of claims 1 to 5, wherein the compressing the second modulated signal to obtain a fourth modulated signal comprises:
and respectively compressing the real part and the imaginary part of the second modulation signal to obtain the fourth modulation signal.
7. The method according to claim 6, wherein the compressing the real part and the imaginary part of the second modulation signal respectively to obtain the fourth modulation signal comprises:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula three to obtain a fourth modulation signal;
wherein the third formula is
x 2 Represents the real part of the second modulated signal, y 2 Represents a real part of the fourth modulated signal; or, x 2 Represents the imaginary part of said second modulated signal, respectively y 2 Represents an imaginary part of the fourth modulation signal; sgn () stands for a sign function, λ 2 Represents the compression factor, λ 2 ＜1。
8. The method according to claim 6, wherein the compressing the real part and the imaginary part of the second modulation signal respectively to obtain the fourth modulation signal comprises:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula four to obtain a fourth modulation signal;
wherein the formula four is
x 2 Represents the real part of the second modulated signal, respectively y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the second toneImaginary part of the system signal, correspondingly, y 2 Represents an imaginary part of the fourth modulation signal; sgn () stands for sign function.
9. The method according to any of claims 1-8, wherein said decoding said compensation modulated signal comprises:
and respectively carrying out soft differential decoding, modulation decoding and FEC decoding on the compensation modulation signal.
10. A signal processing apparatus, characterized by comprising:
the first processing module is used for carrying out phase recovery processing on the received transmission signal to obtain a modulation signal after phase recovery;
a dividing module, configured to divide the phase-recovered modulation signal into a first modulation signal and a second modulation signal; the constellation point mean value of the first modulation signal is located on the coordinate axis of the constellation diagram corresponding to the first modulation signal, and the constellation point mean value of the second modulation signal is located in the quadrant of the constellation diagram corresponding to the first modulation signal;
the second processing module is used for carrying out expansion processing on the first modulation signal to obtain a third modulation signal;
the third processing module is used for compressing the second modulation signal to obtain a fourth modulation signal;
a generating module, configured to generate a compensation modulation signal according to the third modulation signal and the fourth modulation signal;
and the fourth processing module is used for decoding the compensation modulation signal to obtain a decoded signal.
11. The apparatus according to claim 10, wherein the partitioning module is specifically configured to:
dividing the phase-recovered modulation signal into the first modulation signal and the second modulation signal according to a preset constellation diagram and a hard decision method; wherein, the preset constellation diagram includes: the constellation point detection method comprises the following steps of four constellation points respectively located on four coordinate axes of the preset constellation diagram, and four constellation points respectively located in four quadrants of the preset constellation diagram.
12. The apparatus according to claim 10 or 11, wherein the second processing module is specifically configured to: and respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal to obtain a third modulation signal.
13. The apparatus of claim 12, wherein the second processing module is specifically configured to:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein, the formula one is
x 1 Represents the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of said first modulated signal, respectively y 1 Represents an imaginary part of the third modulation signal; sgn () stands for a sign function, λ 1 Represents the spreading factor, λ 1 ＞1。
14. The apparatus of claim 12, wherein the second processing module is specifically configured to:
respectively carrying out expansion processing on a real part and an imaginary part of the first modulation signal according to a formula to obtain a third modulation signal;
wherein the second formula is
x 1 Represents the real part of the first modulated signal, y 1 Represents the real part of the third modulated signal; or, x 1 Represents the imaginary part of the first modulation signal, correspondsGround, y 1 Represents an imaginary part of the third modulation signal; sgn () stands for sign function.
15. The apparatus according to any one of claims 10 to 14, wherein the third processing module is specifically configured to: and respectively compressing the real part and the imaginary part of the second modulation signal to obtain the fourth modulation signal.
16. The apparatus according to claim 15, wherein the third processing module is specifically configured to:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula three to obtain a fourth modulation signal;
wherein the third formula is
x 2 Represents the real part of the second modulated signal, y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of said second modulated signal, respectively y 2 Represents an imaginary part of the fourth modulation signal; sgn () stands for a sign function, λ 2 Represents the compression factor, λ 2 ＜1。
17. The apparatus according to claim 15, wherein the third processing module is specifically configured to:
respectively compressing the real part and the imaginary part of the second modulation signal according to a formula four to obtain a fourth modulation signal;
wherein the formula four is
x 2 Represents the real part of the second modulated signal, respectively y 2 Represents the real part of the fourth modulated signal; or, x 2 Represents the imaginary part of said second modulated signal, respectively y 2 Represents an imaginary part of the fourth modulation signal; sgn: () Representing a symbolic function.
18. The apparatus according to any of claims 10-17, wherein the fourth processing module is specifically configured to: and respectively carrying out soft differential decoding, modulation decoding and FEC decoding on the compensation modulation signal.
19. A signal processing apparatus, characterized by comprising: a processor and a memory;
wherein the memory is configured to store instructions and the processor is configured to execute the memory-stored instructions, and wherein the signal processing apparatus is configured to perform the method of any one of claims 1-9 when the processor executes the memory-stored instructions.
20. A computer-readable storage medium having stored therein instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-9.
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