CN112737684A - Data transmission method and device of optical fiber communication system - Google Patents
Data transmission method and device of optical fiber communication system Download PDFInfo
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- CN112737684A CN112737684A CN202011555457.0A CN202011555457A CN112737684A CN 112737684 A CN112737684 A CN 112737684A CN 202011555457 A CN202011555457 A CN 202011555457A CN 112737684 A CN112737684 A CN 112737684A
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Abstract
The invention provides a data transmission method and a data transmission device of an optical fiber communication system, which relate to the technical field of optical fiber communication and comprise the following steps: acquiring a signal to be transmitted generated by an information source; performing probability shaping on a target symbol of a signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted; carrying out multi-to-one constellation point mapping on the target signal, and carrying out QC-LDPC coding on the target signal subjected to constellation point mapping to obtain a QC-LDPC coded signal; the polarization multiplexing system is utilized to send the QC _ LDPC coded signal to the information sink, and the technical problem that an optical fiber communication system in the prior art is poor in communication quality is solved.
Description
Technical Field
The present invention relates to the field of optical fiber communication technologies, and in particular, to a data transmission method and apparatus for an optical fiber communication system.
Background
In optical fiber communication, probability shaping technology is applied to overcome the problems of poor error code performance and power limitation caused by nonlinear effect. If the performance of each module of the optical communication system is ideal, the input signal can reach the maximum channel capacity under the condition of prior equalization. Since the actual optical communication system has limited transmission power, uniform distribution cannot meet the prior distribution of input signals required by the system to improve the actual communication capacity, and therefore it is necessary to change the prior transmission probability of each point on the constellation diagram.
Therefore, how to change the prior transmission probability of each point on the constellation diagram, thereby improving the actual communication quality becomes an urgent problem to be solved.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a data transmission method and apparatus for an optical fiber communication system, so as to alleviate the technical problem of poor communication quality of the optical fiber communication system in the prior art.
In a first aspect, an embodiment of the present invention provides a data transmission method for an optical fiber communication system, including: acquiring a signal to be transmitted generated by an information source; performing probability shaping on a target symbol of the signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted; carrying out multi-to-one constellation point mapping on the target signal, and carrying out QC-LDPC coding on the target signal subjected to constellation point mapping to obtain a QC-LDPC coded signal; and transmitting the QC _ LDPC coded signal to a signal sink by using a polarization multiplexing system.
Further, acquiring a signal to be transmitted generated by an information source, including: acquiring a pseudo-random sequence generated by information source transmission; and determining the pseudo-random sequence as the signal to be transmitted.
Further, performing probability shaping on the target symbol of the signal to be transmitted to obtain a target signal, including: calculating the data bit of the target symbol based on a preset modulation format; determining attribute information of the target symbol based on the data bit and a preset point in a constellation diagram, wherein the attribute information is one of the following: the two symbols are both special symbols, the two symbols only comprise one special symbol, the two symbols are not special symbols and are the same, the two symbols are not special symbols and are different, and the special symbol is a symbol in the target symbol, which is the same as the coordinate position of the preset point; adding identification information to the special symbol; and performing probability shaping on the target symbol based on the attribute information to obtain the target signal.
Further, determining attribute information of the target symbol based on the data bits and preset points in a constellation diagram, including: determining coordinate information of each symbol in the target symbols in the constellation diagram based on the data bits; and determining the attribute information of the target symbol based on the coordinate information of each symbol in the constellation diagram and the coordinate information of the preset point.
Further, performing probability shaping on the target symbol based on the attribute information to obtain the target signal, including: if the attribute information indicates that the two symbols are both special symbols or that the two symbols are not special symbols and are different, performing double-symbol joint shaping on the target symbol to obtain the target signal; and if the two symbols only comprise one special symbol or the two symbols are not special symbols and are the same, respectively carrying out probability shaping on the two symbols to obtain the target signal.
Further, performing many-to-one constellation point mapping on the target signal includes: and mapping the special symbol in the target signal to a preset coordinate point position of the constellation map to obtain the mapped target signal.
Further, transmitting the QC _ LDPC encoded signal to a signal sink using a polarization multiplexing system, including: adding identification information to the special symbol; and transmitting the target symbol in the QC _ LDPC coded signal to the signal sink by using the X polarization of the polarization multiplexing system, and transmitting the identification information and the check bit information in the QC _ LDPC coded signal to the signal sink by using the Y polarization of the polarization multiplexing system.
In a second aspect, an embodiment of the present invention provides a data transmission apparatus in an optical fiber communication system, including: the device comprises an acquisition unit, a shaping unit, a processing unit and a sending unit, wherein the acquisition unit is used for acquiring a signal to be transmitted generated by an information source; the shaping unit is used for performing probability shaping on a target symbol of the signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted; the processing unit is used for carrying out multi-to-one constellation point mapping on the target signal and carrying out QC-LDPC coding on the target signal subjected to constellation point mapping to obtain a QC-LDPC coded signal; the transmitting unit is used for transmitting the QC _ LDPC coded signal to a signal sink by utilizing a polarization multiplexing system.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory and a processor, where the memory is used to store a program that supports the processor to execute the method in the first aspect, and the processor is configured to execute the program stored in the memory.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the method in the first aspect.
In the embodiment of the invention, a signal to be transmitted is generated by obtaining an information source; performing probability shaping on a target symbol of a signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted; carrying out many-to-one constellation point mapping on a target signal according to a preset mapping rule, and carrying out QC-LDPC encoding on the target signal subjected to constellation point mapping to obtain a QC-LDPC encoded signal; and transmitting the QC _ LDPC coded signal to a signal sink by using a polarization multiplexing system. In the embodiment of the invention, the purposes of improving the error code performance and the power utilization rate are achieved through probability shaping and many-to-one constellation point mapping, and the technical problem of poor communication quality of an optical fiber communication system in the prior art is further solved, so that the technical effect of improving the communication quality of the optical fiber communication system is realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a data transmission method of an optical fiber communication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of performing many-to-one mapping on a target signal of 16QAM according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a change of constellation point mapping after a target signal of 16QAM uses a two-symbol joint shaping many-to-one mapping scheme according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data transmission apparatus of an optical fiber communication system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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 first embodiment is as follows:
in accordance with an embodiment of the present invention, there is provided an embodiment of a data transmission method for an optical fiber communication system, it should be noted that the steps illustrated in the flowchart of the accompanying drawings may be executed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different than that illustrated herein.
Fig. 1 is a flowchart of a data transmission method of an optical fiber communication system according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102, obtaining a signal to be transmitted generated by an information source;
it should be noted that the signal to be transmitted is obtained by obtaining the pseudorandom sequence generated by the information source and determining the pseudorandom sequence as the signal to be transmitted.
Step S104, performing probability shaping on a target symbol of the signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted;
step S106, carrying out many-to-one constellation point mapping on the target signal, and carrying out QC _ LDPC coding on the target signal subjected to constellation point mapping to obtain a QC _ LDPC coded signal;
it should be noted that the above steps S104 and S106 can be performed by the joint shaping distribution matcher, so that the signal to be transmitted changes the original equivalent source data.
In addition, it should be noted that, preferably, after the target signal subjected to constellation point mapping is subjected to QC _ LDPC encoding, the length of the target signal is changed from the information sequence of K to the information sequence of length N, and the code rate K/N, the QC _ LDPC encoding is performed by using a QC-LDPC mode based on the ieee802.16e standard to encode the target signal subjected to constellation point mapping.
And step S108, transmitting the QC _ LDPC coded signal to a signal sink by using a polarization multiplexing system.
In the embodiment of the invention, a signal to be transmitted is generated by obtaining an information source; performing probability shaping on a target symbol of a signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted; carrying out many-to-one constellation point mapping on a target signal according to a preset mapping rule, and carrying out QC-LDPC encoding on the target signal subjected to constellation point mapping to obtain a QC-LDPC encoded signal; and transmitting the QC _ LDPC coded signal to a signal sink by using a polarization multiplexing system. In the embodiment of the invention, the purposes of improving the error code performance and the power utilization rate are achieved through probability shaping and many-to-one constellation point mapping, and the technical problem of poor communication quality of an optical fiber communication system in the prior art is further solved, so that the technical effect of improving the communication quality of the optical fiber communication system is realized.
In the embodiment of the invention, by utilizing the advantage that no additional hardware is added in probability shaping, the prior probabilities of sending different constellation points are different by adding a small amount of redundancy, for example, the redundancy can be increased to increase the sending prior probability of the constellation points with good error code performance close to the origin, and the sending prior probability of the constellation points with poor error code performance far away from the origin is reduced, so that the error code performance and the power utilization rate are improved. Meanwhile, probability shaping does not need to cause extra burden on hardware devices such as a modulator and the like because the shape of the constellation diagram is not changed. Many-to-one (MTO) mapping is an efficient way to implement the PS method without increasing the encoding/decoding hardware complexity. Therefore, the combination of the advantages provides a great potential for the system to improve the practical communication capacity and large-capacity transmission. And the polarization multiplexing system adopts a self-adaptive digital signal processing algorithm to realize polarization tracking, has the characteristics of high speed, simplicity and flexibility, and greatly simplifies the structure of the receiver.
In the embodiment of the present invention, step S104 includes the following steps:
step S11, calculating the data bit of the target symbol based on a preset modulation format;
step S12, determining attribute information of the target symbol based on the data bits and preset points in a constellation diagram, where the attribute information is one of the following: the two symbols are both special symbols, the two symbols only comprise one special symbol, the two symbols are not special symbols and are the same, the two symbols are not special symbols and are different, and the special symbol is a symbol in the target symbol, which is the same as the coordinate position of the preset point;
step S13, adding identification information for the special symbol;
and step S14, performing probability shaping on the target symbol based on the attribute information to obtain the target signal.
In the embodiment of the invention, firstly, the data bit of the target symbol is calculated according to the modulation format of the signal to be transmitted.
And then, determining the attribute information of the target symbol based on the data bit and a preset point in the constellation diagram.
Specifically, based on the data bits, coordinate information of each symbol in the target symbol in the constellation is determined, and then, based on the coordinate information of each symbol in the constellation and the coordinate information of the preset point, attribute information of the target symbol is determined.
As shown in fig. 2, the attribute information of the target symbol is one of the following: the two symbols are both special symbols, the two symbols only comprise one special symbol, the two symbols are not special symbols and are the same, the two symbols are not special symbols and are different, and the special symbols are symbols in the target symbols, wherein the coordinate positions of the target symbols are the same as the coordinate positions of the preset points.
If the attribute information of the target signal is that both the two symbols are special symbols or that both the two symbols are not special symbols and are different, performing double-symbol joint shaping on the target symbol to obtain a target signal;
and if the two symbols only comprise one special symbol or the two symbols are not special symbols and are the same, respectively carrying out probability shaping on the two symbols to obtain the target signal.
In the embodiment of the present invention, performing many-to-one constellation point mapping on the target signal includes the following steps:
step S21, mapping the special symbol in the target signal to the origin position of the constellation map, so as to obtain a target signal after mapping.
As shown in fig. 2, fig. 2 is a schematic diagram of performing many-to-one mapping on a target signal of 16QAM, where 11000000, 11100010, 11010001, and 11110011 are preset points in a constellation diagram, and the remaining points are points corresponding to non-special symbols.
As shown in fig. 3, fig. 3 is a schematic diagram illustrating a change of constellation point mapping after a target signal of 16QAM uses a two-symbol joint shaping many-to-one mapping scheme.
In the embodiment of the present invention, step S108 includes the following steps:
step S31, transmitting the target symbol in the QC _ LDPC encoded signal to the signal sink using the X polarization of the polarization multiplexing system, and transmitting the identification information and the check bit information in the QC _ LDPC encoded signal to the signal sink using the Y polarization of the polarization multiplexing system.
In the embodiment of the invention, the target symbol in the QC _ LDPC coded signal is transmitted to the signal sink by using the X polarization of the polarization multiplexing system, and the identification information and the check bit information in the QC _ LDPC coded signal are transmitted to the signal sink by using the Y polarization of the polarization multiplexing system.
It should be noted that after the signal sink receives the QC _ LDPC coded signal, the signal sink performs digital signal processing on the QC _ LDPC coded signal to compensate the QC _ LDPC coded signal, and then performs QC _ LDPC decoding and probability shaping on the compensated QC _ LDPC coded signal according to the inverse rule of probability shaping to obtain data to be transmitted.
Example two:
the embodiment of the present invention further provides a data transmission device of an optical fiber communication system, where the data transmission device of the optical fiber communication system is used to execute the data transmission method of the optical fiber communication system provided in the foregoing content of the embodiment of the present invention, and the following is a specific description of the data transmission device of the optical fiber communication system provided in the embodiment of the present invention.
As shown in fig. 4, fig. 4 is a schematic diagram of the data transmission device of the optical fiber communication system, where the data transmission device of the optical fiber communication system includes: an acquisition unit 10, a shaping unit 20, a processing unit 30 and a sending unit 40.
The acquiring unit 10 is configured to acquire a signal to be transmitted, which is generated by an information source;
the shaping unit 20 is configured to perform probability shaping on a target symbol of the signal to be transmitted to obtain a target signal, where the target symbol is two continuous symbols on a time axis in the signal to be transmitted;
the processing unit 30 is configured to perform many-to-one constellation point mapping on the target signal, and perform QC _ LDPC encoding on the target signal subjected to constellation point mapping to obtain a QC _ LDPC encoded signal;
the transmitting unit 40 is configured to transmit the QC _ LDPC encoded signal to a sink using a polarization multiplexing system.
In the embodiment of the invention, a signal to be transmitted is generated by obtaining an information source; performing probability shaping on a target symbol of a signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted; carrying out many-to-one constellation point mapping on a target signal according to a preset mapping rule, and carrying out QC-LDPC encoding on the target signal subjected to constellation point mapping to obtain a QC-LDPC encoded signal; and transmitting the QC _ LDPC coded signal to a signal sink by using a polarization multiplexing system. In the embodiment of the invention, the purposes of improving the error code performance and the power utilization rate are achieved through probability shaping and many-to-one constellation point mapping, and the technical problem of poor communication quality of an optical fiber communication system in the prior art is further solved, so that the technical effect of improving the communication quality of the optical fiber communication system is realized.
Preferably, the obtaining unit is configured to obtain a pseudo random sequence generated by a source; and determining the pseudo-random sequence as the signal to be transmitted.
Preferably, the shaping unit is configured to calculate a data bit of the target symbol based on a preset modulation format; determining attribute information of the target symbol based on the data bit and a preset point in a constellation diagram, wherein the attribute information is one of the following: the two symbols are both special symbols, the two symbols only comprise one special symbol, the two symbols are not special symbols and are the same, the two symbols are not special symbols and are different, and the special symbol is a symbol in the target symbol, which is the same as the coordinate position of the preset point; adding identification information to the special symbol; and performing probability shaping on the target symbol based on the attribute information to obtain the target signal.
Preferably, the shaping unit is further configured to: determining coordinate information of each symbol in the target symbols in the constellation diagram based on the data bits; and determining the attribute information of the target symbol based on the coordinate information of each symbol in the constellation diagram and the coordinate information of the preset point.
Preferably, the shaping unit is further configured to: if the attribute information indicates that the two symbols are both special symbols or that the two symbols are not special symbols and are different, performing double-symbol joint shaping on the target symbol to obtain the target signal; and if the two symbols only comprise one special symbol or the two symbols are not special symbols and are the same, respectively carrying out probability shaping on the two symbols to obtain the target signal.
Preferably, the processing unit is configured to map a special symbol in the target signal to an origin position of the constellation map, so as to obtain a target signal after mapping.
Preferably, the sending unit is configured to: and transmitting the target symbol in the QC _ LDPC coded signal to the signal sink by using the X polarization of the polarization multiplexing system, and transmitting the identification information and the check bit information in the QC _ LDPC coded signal to the signal sink by using the Y polarization of the polarization multiplexing system.
Example three:
an embodiment of the present invention further provides an electronic device, including a memory and a processor, where the memory is used to store a program that supports the processor to execute the method described in the first embodiment, and the processor is configured to execute the program stored in the memory.
Referring to fig. 5, an embodiment of the present invention further provides an electronic device 100, including: the device comprises a processor 50, a memory 51, a bus 52 and a communication interface 53, wherein the processor 50, the communication interface 53 and the memory 51 are connected through the bus 52; the processor 50 is arranged to execute executable modules, such as computer programs, stored in the memory 51.
The Memory 51 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 53 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.
The bus 52 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 5, but this does not indicate only one bus or one type of bus.
The memory 51 is used for storing a program, the processor 50 executes the program after receiving an execution instruction, and the method executed by the apparatus defined by the flow process disclosed in any of the foregoing embodiments of the present invention may be applied to the processor 50, or implemented by the processor 50.
The processor 50 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 50. The Processor 50 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 51, and the processor 50 reads the information in the memory 51 and completes the steps of the method in combination with the hardware thereof.
Example four:
the embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program performs the steps of the method in the first embodiment.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of 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 of devices or units through some communication interfaces, 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 invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for data transmission in an optical fiber communication system, comprising:
acquiring a signal to be transmitted generated by an information source;
performing probability shaping on a target symbol of the signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted;
carrying out multi-to-one constellation point mapping on the target signal, and carrying out QC-LDPC coding on the target signal subjected to constellation point mapping to obtain a QC-LDPC coded signal;
and transmitting the QC _ LDPC coded signal to a signal sink by using a polarization multiplexing system.
2. The method of claim 1, wherein obtaining a signal to be transmitted generated by a source comprises:
acquiring a pseudo-random sequence generated by information source transmission;
and determining the pseudo-random sequence as the signal to be transmitted.
3. The method of claim 1, wherein probability shaping a target symbol of the signal to be transmitted to obtain a target signal comprises:
calculating the data bit of the target symbol based on a preset modulation format;
determining attribute information of the target symbol based on the data bit and a preset point in a constellation diagram, wherein the attribute information is one of the following: the two symbols are both special symbols, the two symbols only comprise one special symbol, the two symbols are not special symbols and are the same, the two symbols are not special symbols and are different, and the special symbol is a symbol in the target symbol, which is the same as the coordinate position of the preset point;
adding identification information to the special symbol;
and performing probability shaping on the target symbol based on the attribute information to obtain the target signal.
4. The method of claim 3, wherein determining the attribute information of the target symbol based on the data bits and a preset point in a constellation comprises:
determining coordinate information of each symbol in the target symbols in the constellation diagram based on the data bits;
and determining the attribute information of the target symbol based on the coordinate information of each symbol in the constellation diagram and the coordinate information of the preset point.
5. The method of claim 4, wherein probability shaping the target symbol based on the attribute information to obtain the target signal comprises:
if the attribute information indicates that the two symbols are both special symbols or that the two symbols are not special symbols and are different, performing double-symbol joint shaping on the target symbol to obtain the target signal;
and if the two symbols only comprise one special symbol or the two symbols are not special symbols and are the same, respectively carrying out probability shaping on the two symbols to obtain the target signal.
6. The method of claim 3, wherein performing a many-to-one constellation point mapping on the target signal comprises:
and mapping the special symbol in the target signal to a preset coordinate point position of the constellation map to obtain the mapped target signal.
7. The method according to claim 3, wherein transmitting the QC _ LDPC coded signal to a sink using a polarization multiplexing system comprises:
and transmitting the target symbol in the QC _ LDPC coded signal to the signal sink by using the X polarization of the polarization multiplexing system, and transmitting the identification information and the check bit information in the QC _ LDPC coded signal to the signal sink by using the Y polarization of the polarization multiplexing system.
8. A data transmission apparatus for an optical fiber communication system, comprising: an acquisition unit, a shaping unit, a processing unit and a sending unit, wherein,
the acquisition unit is used for acquiring a signal to be transmitted generated by an information source;
the shaping unit is used for performing probability shaping on a target symbol of the signal to be transmitted to obtain a target signal, wherein the target symbol is two continuous symbols on a time axis in the signal to be transmitted;
the processing unit is used for carrying out multi-to-one constellation point mapping on the target signal and carrying out QC-LDPC coding on the target signal subjected to constellation point mapping to obtain a QC-LDPC coded signal;
the transmitting unit is used for transmitting the QC _ LDPC coded signal to a signal sink by utilizing a polarization multiplexing system.
9. An electronic device comprising a memory for storing a program that enables a processor to perform the method of any of claims 1 to 7 and a processor configured to execute the program stored in the memory.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of the claims 1 to 7.
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