CN113114604B - Signal transmission method, device and system - Google Patents
Signal transmission method, device and system Download PDFInfo
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- CN113114604B CN113114604B CN202110265221.1A CN202110265221A CN113114604B CN 113114604 B CN113114604 B CN 113114604B CN 202110265221 A CN202110265221 A CN 202110265221A CN 113114604 B CN113114604 B CN 113114604B
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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
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The disclosure relates to a signal transmission method, a signal transmission device and a signal transmission system. The signal transmission method comprises the following steps: receiving communication signals from a plurality of transmitting terminals; the communication signals from a plurality of transmitting ends are modulated according to the following superposition model: x MQAM‑PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM Wherein X is 8PSK Representing 8 phase shift keyed 8PSK signals, X, from a first of said transmitters 4QAM Representing a 4 quadrature phase shift keyed 4QAM signal, X, from a second one of said transmitting terminals 8QAM Representing 8 quadrature phase shift keyed 8QAM signals from a third one of said transmitting terminals, X 16QAM Represents a power ratio from a 16QAM signal from the fourth transmitting terminal, a represents a power ratio of a 4QAM signal to an 8PSK signal, b represents a power ratio of an 8QAM signal to a 32QAM-PSK signal, c represents a power ratio of a 16QAM signal to a 256QAM-PSK signal, X MQAM‑PSK A modulated signal; the modulated signal is directed into an optical fiber for transmission.
Description
Technical Field
The present disclosure relates to the field of digital communication technologies, and in particular, to a signal transmission method, an apparatus, a signal transmission system, and a computer-readable storage medium.
Background
In recent years, with the large-scale rise of technologies such as big data, artificial intelligence, internet of things and the like, network traffic is increased explosively, the original infrastructure is difficult to load the requirement of ultra-high capacity transmission, and similarly, the original signal transmission mode is difficult to meet the requirements of the current information transmission rate and communication capacity. Therefore, it is highly desirable to find a way to improve the information transmission efficiency and transmission capacity.
Disclosure of Invention
An object of the present disclosure is to provide a signal transmission method, apparatus, signal transmission system, and computer-readable storage medium to improve information transmission efficiency and transmission capacity.
According to an aspect of an embodiment of the present disclosure, there is provided a signal transmission method including:
receiving communication signals from a plurality of transmitting terminals;
modulating communication signals from a plurality of transmitting terminals according to a superposition model;
leading the modulated signal into an optical fiber for transmission;
wherein the superposition model is X MQAM-PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM ，X 8PSK Representing 8 phase shift keyed 8PSK signals, X, from a first of said transmitters 4QAM Representing a 4 quadrature phase shift keyed 4QAM signal, X, from a second one of said transmitting terminals 8QAM Representing 8 quadrature phase shifts from a third of said transmitting endsKeyed 8QAM signals, X 16QAM Representing a 16 quadrature phase shift keyed 16QAM signal from a fourth said transmitting terminal, a representing a power ratio of the 4QAM signal to the 8PSK signal, b representing a power ratio of the 8QAM signal to the 32QAM-PSK signal, c representing a power ratio of the 16QAM signal to the 256QAM-PSK signal, X MQAM-PSK The modulated signal.
In some embodiments, said modulating a plurality of said communication signals comprises:
the communication signals of the two transmitting ends are modulated according to the following superposition model:
X 32QAM-PSK ＝X 8PSK +aX 4QAM ；
wherein, X 32QAM-PSK Representing a modulated two-dimensional 32QAM-PSK signal.
In some embodiments, the signal transmission method further comprises: after said introduction of the modulated signal into the optical fiber,
determining the constellation point coordinates of the two-dimensional 32QAM-PSK signal according to the two-dimensional 32QAM-PSK signal received by the receiving terminal, and determining the constellation point coordinates of the 4QAM signal according to the quadrant position of the two-dimensional 32QAM-PSK signal;
demodulating 4QAM signals according to the 4QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 8PSK signal in a linear subtraction mode:
x 8PSK ＝x 32QAM-PSK -x 4QAM wherein x is 32QAM-PSK Represents the constellation point coordinate, x, of the two-dimensional 32QAM-PSK signal received by the receiving end 4QAM Representing the constellation point coordinates, x, of a 4QAM signal 8PSK Representing constellation point coordinates of the 8PSK signal;
and demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal.
In some embodiments, said modulating a plurality of said communication signals comprises:
the communication signals of the three transmitting ends are modulated according to the following superposition model:
X 32QAM-PSK ＝X 8PSK +aX 4QAM ；
X 256QAM-PSK ＝X 32QAM-PSK +bX 8QAM ；
wherein, X 32QAM-PSK Representing a modulated two-dimensional 32QAM-PSK signal, X 256QAM-PSK Representing a modulated three-dimensional 256QAM-PSK signal.
In some embodiments, the signal transmission method further comprises: after said introduction of the modulated signal into the optical fiber,
determining the constellation point coordinates of the three-dimensional 256QAM-PSK signal according to the three-dimensional 256QAM-PSK signal received by the receiving terminal, and determining the constellation point of the 8QAM signal according to the position of the constellation point of the three-dimensional 256QAM-PSK signal in a three-dimensional space;
demodulating 8QAM signals according to the 8QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 32QAM-PSK signal by means of linear subtraction:
x 32QAM-PSK ＝x 256QAM-PSK -x 8QAM wherein x is 256QAM-PSK Represents the constellation point coordinate, x, of the three-dimensional 256QAM-PSK signal received by the receiving end 8QAM Representing the constellation point coordinates, x, of an 8QAM signal 32QAM-PSK Representing constellation point coordinates of the 32QAM-PSK signal;
determining a constellation point of the 4QAM signal according to a quadrant position of the two-dimensional 32QAM-PSK signal;
demodulating 4QAM signals according to the 4QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 8PSK signal in a linear subtraction mode:
x 8PSK ＝x 32QAM-PSK -x 4QAM ；
and demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal.
According to another aspect of the embodiments of the present disclosure, there is provided a signal transmission apparatus including:
a receiving unit, configured to receive communication signals from a plurality of transmitting terminals;
processing sheetThe element is used for modulating communication signals from a plurality of transmitting terminals according to the following superposition model: x MQAM-PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM Wherein X is 8PSK Representing 8 phase shift keyed 8PSK signals, X, from a first of said transmitters 4QAM Representing a 4 quadrature phase shift keyed 4QAM signal, X, from a second one of said transmitting terminals 8QAM Representing 8 quadrature phase shift keyed 8QAM signals from a third one of said transmitting terminals, X 16QAM Representing a 16 quadrature phase shift keying 16QAM signal from a fourth said transmitting terminal, a representing a power ratio of the 4QAM signal to the 8PSK signal, b representing a power ratio of the 8QAM signal to the 32QAM-PSK signal, c representing a power ratio of the 16QAM signal to the 256QAM-PSK signal, X MQAM-PSK A modulated signal;
and the leading-in unit is used for leading the modulated signal into the optical fiber for transmission.
According to still another aspect of an embodiment of the present disclosure, there is provided a signal transmission system including: a memory and a processor coupled to the memory, the processor configured to perform the signal transmission method according to any of the above embodiments based on instructions stored in the memory.
In some embodiments, the signal transmission system further comprises:
a transmitting end for transmitting a communication signal;
and the optical fiber is used for transmitting the modulated signal.
In some embodiments, the optical fiber is a multicore optical fiber, each core of the multicore optical fiber configured to transmit the modulated signal.
According to a further aspect of an embodiment of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a signal transmission method according to any of the above embodiments.
By adopting the technical scheme of the embodiment of the disclosure, the communication signal of the transmitting end is modulated by a linear superposition modulation format, and the modulated signal is guided into the optical fiber for transmission. The modulation format can not only improve the efficiency and the transmission capacity of information transmission, but also improve the BER performance of a transmission system, thereby better adapting to the requirement of ultra-high capacity transmission. In addition, the modulation format principle is simple, so that the demodulation mode is simple, and the operation and the realization are easy. Moreover, the modulation format can also carry out high-order expansion to a high-dimensional space, and therefore, the modulation format has a wider application space.
Of course, not all advantages described above need necessarily be achieved at the same time by a product or method embodying any embodiment of the disclosure.
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 only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a signal transmission method according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a constellation diagram of a two-dimensional 32QAM-PSK signal obtained by linear superposition according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of constellation points of an 8QAM signal according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of constellation points of a three-dimensional 256QAM-PSK signal in accordance with an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating a forming process of constellation points of a three-dimensional 256QAM-PSK signal according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a signal transmission apparatus according to an embodiment of the disclosure;
FIG. 7 is a use of the signal transmission system of an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a multi-core optical fiber of an embodiment of the present disclosure;
fig. 9 is a schematic view of inter-core crosstalk of a multi-core optical fiber according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments given herein by one of ordinary skill in the art, are within the scope of the invention.
The present disclosure provides a signal transmission method, apparatus, signal transmission system, and computer-readable storage medium to improve information transmission efficiency and transmission capacity.
An embodiment of a first aspect of the present disclosure provides a signal transmission method. As shown in fig. 1, a signal transmission method according to an embodiment of the present disclosure includes the steps of:
step S10: receiving communication signals from a plurality of transmitting terminals;
step S20: modulating communication signals from a plurality of transmitting terminals according to the following superposition model;
X MQAM-PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM
wherein, X 8PSK Representing 8PSK signals, X, from a first one of said transmitting terminals 4QAM Representing a 4QAM signal, X, from a second one of said transmitting ends 8QAM Representing 8QAM signals from a third one of said transmitting terminals, X 16QAM Representing a power ratio from a 16QAM signal from a fourth one of said transmitting terminals, a representing a power ratio of a 4QAM signal to a 8PSK signal, b representing a power ratio of an 8QAM signal to a 32QAM-PSK signal, c representing a power ratio of a 16QAM signal to a 256QAM-PSK signal, X MQAM-PSK A modulated signal;
step S30: the modulated signal is directed into an optical fiber for transmission.
According to the signal transmission method disclosed by the embodiment of the disclosure, the communication signal of the transmitting end is modulated through a linear superposition modulation format, and the modulated signal is guided into the optical fiber for transmission. The modulation format can not only improve the efficiency and the transmission capacity of information transmission, but also improve the BER performance of a transmission system, thereby better adapting to the requirement of ultra-high capacity transmission. In addition, the modulation format principle is simple, so that the demodulation mode is simple, and the operation and the realization are easy. Moreover, the modulation format can also carry out high-order expansion to a high-dimensional space, and therefore, the modulation format has a wider application space.
In one specific example, the plurality of transmitting terminals includes two transmitting terminals, and the modulating the plurality of communication signals includes:
the communication signals of the two transmitting ends are modulated according to the following superposition model:
X 32QAM-PSK ＝X 8PSK +aX 4QAM ；
wherein, X 32QAM-PSK Representing a modulated two-dimensional 32QAM-PSK signal.
The example is a process for implementing superposition modulation of a two-dimensional 32QAM-PSK signal, the two-dimensional 32QAM-PSK signal can be obtained through modulation, and fig. 2 shows a constellation diagram of the two-dimensional 32QAM-PSK signal obtained through linear superposition.
Further, based on an example of superposition modulation on a two-dimensional 32QAM-PSK signal, the signal transmission method further includes: after said introduction of the modulated signal into the optical fiber,
determining the constellation point coordinates of the two-dimensional 32QAM-PSK signal according to the two-dimensional 32QAM-PSK signal received by the receiving terminal, and determining the constellation point coordinates of the 4QAM signal according to the quadrant position of the two-dimensional 32QAM-PSK signal;
demodulating 4QAM signals according to the 4QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 8PSK signal in a linear subtraction mode:
x 8PSK ＝x 32QAM-PSK -x 4QAM wherein x is 32QAM-PSK Represents the constellation point coordinate, x, of the two-dimensional 32QAM-PSK signal received by the receiving end 4QAM Representing the constellation point coordinates, x, of a 4QAM signal 8PSK Representing constellation point coordinates of the 8PSK signal;
and demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal.
It can be understood that, since the two-dimensional 32QAM-PSK signal is modulated by the 8PSK signal and the 4QAM signal in a linear superposition manner, the demodulation of the two-dimensional 32QAM-PSK signal can be realized by the above-mentioned linear subtraction manner. Therefore, the demodulation mode is simple, and the operation and the realization are easy.
Specifically, the step of demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal includes:
and demodulating the 8PSK signal by minimum Euclidean distance judgment and maximum likelihood estimation according to the constellation point coordinates of the 8PSK signal.
Since the minimum euclidean distance decision and the maximum likelihood estimation are both existing methods, this is not explained in detail in the embodiments of the present disclosure.
In another specific example, the plurality of transmitting terminals includes three transmitting terminals, and the modulating the plurality of communication signals includes:
the communication signals of the three transmitting ends are modulated according to the following superposition model:
X 32QAM-PSK ＝X 8PSK +aX 4QAM ；
X 256QAM-PSK ＝X 32QAM-PSK +bX 8QAM ；
wherein, X 32QAM-PSK Representing a modulated two-dimensional 32QAM-PSK signal, X 256QAM-PSK Representing a modulated three-dimensional 256QAM-PSK signal.
The example is a realization process of superposition modulation of three-dimensional 256QAM-PSK signals, and the three-dimensional 256QAM-PSK signals can be obtained through modulation. Fig. 3 shows constellation points of an 8QAM signal, and fig. 4 shows a constellation diagram of a three-dimensional 256QAM-PSK signal obtained by linear superposition. Fig. 5 shows a process of forming a 256QAM-PSK signal constellation diagram by linearly superimposing 32QAM-8PSK constellation points for an 8QAM signal.
Further, based on an example of superposition modulation on a three-dimensional 256QAM-PSK signal, the signal transmission method further includes: after said introduction of the modulated signal into the optical fiber,
determining the constellation point coordinates of the three-dimensional 256QAM-PSK signal according to the three-dimensional 256QAM-PSK signal received by a receiving end, and determining the constellation point of the 8QAM signal according to the position of the constellation point of the three-dimensional 256QAM-PSK signal in a three-dimensional space;
demodulating 8QAM signals according to the 8QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 32QAM-PSK signal by means of linear subtraction:
x 32QAM-PSK ＝x 256QAM-PSK -x 8QAM wherein x is 256QAM-PSK Represents the constellation point coordinate, x, of the three-dimensional 256QAM-PSK signal received by the receiving end 8QAM Representing the constellation point coordinates, x, of an 8QAM signal 32QAM-PSK Representing constellation point coordinates of the 32QAM-PSK signal;
determining a constellation point of the 4QAM signal according to a quadrant position of the two-dimensional 32QAM-PSK signal;
demodulating 4QAM signals according to the 4QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 8PSK signal in a linear subtraction mode:
x 8PSK ＝x 32QAM-PSK -x 4QAM ；
and demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal.
It can be understood that, since the three-dimensional 256QAM-PSK signal is modulated by the 8PSK signal, the 4QAM signal and the 8QAM signal in a linear superposition manner, the demodulation of the three-dimensional 256QAM-PSK signal can be realized by the above-mentioned linear subtraction manner. Therefore, the demodulation mode is simple, and the operation and the realization are easy.
Specifically, the step of demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal includes:
and demodulating the 8PSK signal by minimum Euclidean distance judgment and maximum likelihood estimation according to the constellation point coordinates of the 8PSK signal.
Since the minimum euclidean distance decision and the maximum likelihood estimation are both existing methods, this is not explained in detail in the embodiments of the present disclosure.
An embodiment of the second aspect of the present disclosure proposes a signal transmission device 10, as shown in fig. 6, the signal transmission device 10 including:
a receiving unit 11, configured to receive communication signals from a plurality of transmitting terminals;
a processing unit 12, configured to modulate communication signals from multiple transmitting ends according to the following superposition model: x MQAM-PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM Wherein X is 8PSK Representing 8 phase shift keyed 8PSK signals, X, from a first of said transmitters 4QAM Representing a 4 quadrature phase shift keyed 4QAM signal, X, from a second one of said transmitting terminals 8QAM Representing 8 quadrature phase shift keyed 8QAM signals from a third one of said transmitting terminals, X 16QAM Representing a 16 quadrature phase shift keying 16QAM signal from a fourth said transmitting terminal, a representing a power ratio of the 4QAM signal to the 8PSK signal, b representing a power ratio of the 8QAM signal to the 32QAM-PSK signal, c representing a power ratio of the 16QAM signal to the 256QAM-PSK signal, X MQAM-PSK A modulated signal;
and an introducing unit 13 for introducing the modulated signal into an optical fiber for transmission.
An embodiment of the third aspect of the present disclosure provides a signal transmission system 100, as shown in fig. 7, the signal transmission system 100 includes: a memory 110 and a processor 120 coupled to the memory 110, the processor 120 being configured to perform the signal transmission method according to any of the embodiments described above based on instructions stored in the memory 110.
The Memory 110 may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. The memory 110 may also be at least one storage device located remotely from the aforementioned processor 120.
The Processor 120 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
In some embodiments of the present disclosure, the signal transmission system 100 further comprises a transmitting end (not shown in the figure) and an optical fiber 130, wherein the transmitting end is used for generating communication signals, and the optical fiber 130 is used for transmitting modulated signals.
Further, as shown in fig. 8, the optical fiber 130 is a multi-core optical fiber, and each core 131 in the multi-core optical fiber is configured to transmit the modulated signal.
In the embodiment of the present disclosure, the optical fiber 130 is a multi-core optical fiber, the multi-core optical fiber refers to an optical fiber integrated with a plurality of independent cores 131, and the data transmission capacity of the optical fiber 130 can be increased in multiples with the increase of the number of the cores 131.
Specifically, the multicore fiber may be a double clad fiber, i.e., an inner cladding 133 and an outer cladding 132 are disposed outside the core 131.
To illustrate the beneficial effects of the embodiments of the present disclosure, the following description takes a seven-core optical fiber as an example:
transmission matrix model of seven-core fiber:
in a signal transmission system comprising a multi-core optical fiber, the novel modulation format is adopted to be beneficial to improving the BER performance of the system. For a multi-core fiber, assuming that only fundamental mode transmission occurs in each core 131, and the signal amplitude in the core P is represented by a (P), the coupling effect between the cores can be represented as:
wherein A (z) ═ A 1 (z),A 2 (z),…A n (z)] T i
A (z) is a column of vectors, z is the propagation direction, C is a matrix of n x n, and the coefficients in the matrix can be found according to the following equation:
wherein, beta p Representing the propagation constant of the core P, the crosstalk coefficient C between cores pq This can be found from the following equation:
wherein V, U, W is:
the crosstalk between cores occurs between different fiber cores, and if homogeneous fiber cores are adopted, the crosstalk between cores can only occur between the same modes of different fiber cores under the condition of no conical deformation. FIG. 9 shows the cross talk between cores in the same mode, in which the power of LP01-LP01 of two un-tapered fibers varies periodically, and the power of LP01-LP11 of two tapered fibers varies periodically. The number of fiber cores in the multi-core fiber can be increased according to the practical application requirement so as to meet the required capacity requirement. The number of cores of the multicore fiber is not limited to the seven-core fiber, and may be n fibers. For the sake of calculation, only the transmission of seven cores is considered, the seven cores transmitting in the same pattern. The seven-core optical fiber model is characterized in that seven paths of 3D-256QAM-PSK signals are generated at a transmitting end, then the signals enter seven fiber cores of a multi-core optical fiber respectively, each fiber core is transmitted by using a fundamental mode, and for the seven-core optical fiber model, the signals are amplified by an erbium-doped optical fiber amplifier after being transmitted by a section of optical fiber. And (3) carrying out transmission through the multi-core fiber, demultiplexing the signals and carrying out coherent detection. Before the digital signal processing and recovery, the analog-to-digital conversion is firstly carried out, then the dispersion compensation of a frequency domain is carried out, then the channel equalization is carried out on the signal, then a series of recovery and judgment are carried out on the signal, and finally the error rate calculation is carried out.
An embodiment of a fourth aspect of the present disclosure proposes a computer-readable storage medium on which a computer program is stored, which computer program, when executed by a processor, implements a signal transmission method according to any of the embodiments described above.
Furthermore, in still further embodiments of the present disclosure, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the signal transmission method of any of the above embodiments.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the disclosure are wholly or partially generated when the computer program instructions are loaded and executed on a computer. 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, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A signal transmission method, comprising:
receiving communication signals from a plurality of transmitting terminals;
modulating communication signals from a plurality of transmitting terminals according to a superposition model;
leading the modulated signal into an optical fiber for transmission;
wherein the superposition model is X MQAM-PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM ，X 8PSK Representing 8 phase shift keyed 8PSK signals, X, from a first of said transmitters 4QAM Representing a 4 quadrature phase shift keyed 4QAM signal, X, from a second one of said transmitting terminals 8QAM Representing 8 quadrature phase shift keyed 8QAM signals from a third one of said transmitting terminals, X 16QAM Representing a 16QAM signal from a fourth said transmitting terminal, a representing a power ratio of a 4QAM signal and a 8PSK signal, b representing a power ratio of an 8QAM signal and a 32QAM-PSK signal, said 32QAM-PSK signal being a two-dimensional signal modulated by said superposition model based on said 8PSK signal and said 4QAM signal, c representing a power ratio of a 16QAM signal and a 256QAM-PSK signal, said 256QAM-PSK signal being a three-dimensional signal modulated by said superposition model based on said 8PSK signal, said 4QAM signal and said 8QAM signal, X being a power ratio of a 4QAM signal and a 8PSK signal MQAM-PSK The modulated signal.
2. The signal transmission method according to claim 1, wherein the plurality of transmitting terminals include two transmitting terminals, and the modulating the plurality of communication signals includes:
the communication signals of the two transmitting ends are modulated according to the following superposition model:
X 32QAM-PSK ＝X 8PSK +aX 4QAM ；
wherein, X 32QAM-PSK Representing a modulated two-dimensional 32QAM-PSK signal.
3. The signal transmission method according to claim 2, further comprising:
after the modulated signal is guided into the optical fiber, determining the constellation point coordinates of the two-dimensional 32QAM-PSK signal according to the two-dimensional 32QAM-PSK signal received by a receiving end, and determining the constellation point coordinates of the 4QAM signal according to the quadrant position of the two-dimensional 32QAM-PSK signal;
demodulating 4QAM signals according to the 4QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 8PSK signal in a linear subtraction mode:
x 8PSK ＝x 32QAM-PSK -x 4QAM wherein x is 32QAM-PSK Represents the constellation point coordinate, x, of the two-dimensional 32QAM-PSK signal received by the receiving end 4QAM Representing the constellation point coordinates, x, of a 4QAM signal 8PSK Representing constellation point coordinates of the 8PSK signal;
and demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal.
4. The signal transmission method according to claim 1, wherein the plurality of transmitting terminals includes three transmitting terminals, and the modulating the plurality of communication signals includes:
the communication signals of the three transmitting ends are modulated according to the following superposition model:
X 32QAM-PSK ＝X 8PSK +aX 4QAM ；
X 256QAM-PSK ＝X 32QAM-PSK +bX 8QAM ；
wherein, X 32QAM-PSK Representing a modulated two-dimensional 32QAM-PSK signal, X 256QAM-PSK Representing a modulated three-dimensional 256QAM-PSK signal.
5. The signal transmission method according to claim 4, further comprising:
after the modulated signal is guided into the optical fiber, determining the constellation point coordinates of the three-dimensional 256QAM-PSK signal according to the three-dimensional 256QAM-PSK signal received by a receiving end, and determining the constellation point of the 8QAM signal according to the position of the constellation point of the three-dimensional 256QAM-PSK signal in a three-dimensional space;
demodulating 8QAM signals according to the 8QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 32QAM-PSK signal by means of linear subtraction:
x 32QAM-PSK ＝x 256QAM-PSK -x 8QAM wherein x is 256QAM-PSK Represents the constellation point coordinate, x, of the three-dimensional 256QAM-PSK signal received by the receiving end 8QAM Representing the constellation point coordinates, x, of an 8QAM signal 32QAM-PSK Representing constellation point coordinates of the 32QAM-PSK signal;
determining a constellation point of the 4QAM signal according to a quadrant position of the two-dimensional 32QAM-PSK signal;
demodulating 4QAM signals according to the 4QAM signals corresponding to the constellation points in the modulation process;
obtaining the constellation point coordinates of the 8PSK signal by means of linear subtraction:
x 8PSK ＝x 32QAM-PSK -x 4QAM ；
and demodulating the 8PSK signal according to the constellation point coordinates of the 8PSK signal.
6. A signal transmission apparatus, comprising:
a receiving unit for receiving communication signals from a plurality of transmitting terminals;
the processing unit is used for modulating the communication signals from the plurality of transmitting terminals according to the following superposition model: x MQAM-PSK ＝X 8PSK +aX 4QAM +bX 8QAM +cX 16QAM Wherein X is 8PSK Representing 8 phase shift keyed 8PSK signals, X, from a first of said transmitters 4QAM Representing a 4 quadrature phase shift keyed 4QAM signal, X, from a second one of said transmitting terminals 8QAM Representing 8 quadrature phase shift keyed 8QAM signals from a third one of said transmitting terminals, X 16QAM Representing a 16QAM signal from a fourth said transmitting terminal, a representing a power ratio of a 4QAM signal and a 8PSK signal, b representing a power ratio of an 8QAM signal and a 32QAM-PSK signal, said 32QAM-PSK signal being a two-dimensional signal modulated by said superposition model based on said 8PSK signal and said 4QAM signal, c representing a power ratio of a 16QAM signal and a 256QAM-PSK signal, said 256QAM-PSK signal being a three-dimensional signal modulated by said superposition model based on said 8PSK signal, said 4QAM signal and said 8QAM signal, X being a power ratio of a 4QAM signal and a 8PSK signal MQAM-PSK A modulated signal;
and the leading-in unit is used for leading the modulated signal into the optical fiber for transmission.
7. A signal transmission system, comprising: a memory and a processor coupled to the memory, the processor configured to perform the signal transmission method of any of claims 1 to 5 based on instructions stored in the memory.
8. The signal transmission system according to claim 7, further comprising:
a transmitting end for transmitting a communication signal;
and the optical fiber is used for transmitting the modulated signal.
9. The signal transmission system in accordance with claim 8, wherein the optical fiber is a multicore optical fiber, each core of the multicore optical fiber configured to transmit the modulated signal.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a signal transmission method according to any one of claims 1 to 5.
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