CN114389708A - Signal coding modulation method applied to optical communication system - Google Patents
Signal coding modulation method applied to optical communication system Download PDFInfo
- Publication number
- CN114389708A CN114389708A CN202111472758.1A CN202111472758A CN114389708A CN 114389708 A CN114389708 A CN 114389708A CN 202111472758 A CN202111472758 A CN 202111472758A CN 114389708 A CN114389708 A CN 114389708A
- Authority
- CN
- China
- Prior art keywords
- signal
- ternary
- data
- constellation
- modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 44
- 238000004891 communication Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010586 diagram Methods 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000013507 mapping Methods 0.000 claims abstract description 7
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 239000013307 optical fiber Substances 0.000 abstract description 6
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
-
- 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
- H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Optical Communication System (AREA)
- Error Detection And Correction (AREA)
Abstract
The invention discloses a signal coding modulation method applied to an optical communication system. The conventional grid coding modulation is based on a square quadrature amplitude modulation constellation diagram, and a preset signal constellation diagram of the method is based on a triangular quadrature amplitude modulation signal constellation diagram, the constellation diagram is divided into a plurality of ternary subsets, constellation point selection is realized through subset selection and diversity mapping, a complex signal is obtained, and then the complex signal is subjected to light modulation. After the signal modulation is finished, the signal passes through an optical fiber channel, the optical signal is received at a signal receiving end, and the received optical signal is subjected to analog-to-digital conversion to obtain a complex signal. And then using a soft-decision Viterbi decoding algorithm to carry out demodulation decision to obtain an original signal. The method can realize the reduction of average symbol energy by changing the structure of a constellation diagram and a coding modulation method, thereby reducing the average power of signal transmission and prolonging the transmission distance of optical fibers.
Description
Technical Field
The invention relates to a signal coding modulation method applied to an optical communication system, belonging to the technical field of optical communication.
Background
In an optical fiber communication system, before a signal is transmitted by a signal transmitting end, a signal to be transmitted is generally encoded according to a preset encoding mode, then the encoded signal is modulated according to a preset modulation mode, and then the modulated signal is demodulated and decoded after receiving the modulated signal at a receiving end through an optical fiber channel to recover an original signal.
The Trellis Coded Modulation (TCM) technology combines coding and modulation, and realizes coding and modulation of signals through subset selection and diversity mapping, thereby increasing the redundancy of signals to achieve error correction capability without reducing the frequency band utilization rate and the power utilization rate, and effectively reducing the bit error rate of the optical communication system, thereby improving the transmission performance of the optical communication system. However, in the conventional TCM technology, the constellation diagram is divided into subsets based on Square Quadrature Amplitude Modulation (SQAM), and the whole signal needs higher transmission power in the transmission process, which limits the transmission distance of the signal.
Disclosure of Invention
The invention discloses a signal coding modulation method applied to an optical communication system, aiming at solving the problem that the prior art needs higher transmission power in signal transmission, and aiming at reducing the transmission power of the system while reducing the error rate of the transmission signal of the optical communication system, increasing the transmission distance of the system and improving the performance of the optical communication system.
The purpose of the invention is realized by the following technical scheme:
the method comprises the steps of dividing a triangular quadrature amplitude modulation signal constellation diagram into a plurality of ternary subsets serving as a preset signal constellation diagram, selecting constellation points through subset selection and diversity mapping to obtain a complex signal, and then carrying out optical modulation on the complex signal. After the signal modulation is finished, the signal is transmitted through an optical fiber channel, and after the signal receiving end receives the optical signal, the received optical signal is subjected to analog-to-digital conversion to obtain a complex signal. And then using a soft-decision Viterbi decoding algorithm to carry out demodulation decision to obtain an original signal.
A signal coding modulation method applied to an optical communication system comprises the following specific steps:
the method comprises the following steps: at a signal transmitting end, an original data sequence is obtained, and serial-parallel conversion is carried out on the original data sequence to obtain a preset number of paths of first data.
Step two: dividing the first data into two parts, wherein the first part of data is subjected to bit sequence to ternary symbol sequence conversion to obtain second data, and the second data is subjected to ternary convolution coding to obtain coding sequences, and different coding sequences are used for designating different ternary sub-constellations; the second part of data is used for appointing different constellation points of the ternary sub-constellation diagram, and the second part of data and the first part of data are jointly subjected to subset selection and diversity mapping to obtain a complex signal.
2.1 carrying out ternary convolution coding according to the second data.
The ternary convolutional coding has various different formats, and the code rate, the constraint length and the generating matrix of the ternary convolutional coding are selected according to the modulation order and the information redundancy, so that the free Euclidean distance is maximized. And passing the second data through a ternary convolution encoder to obtain coding sequences, wherein different coding sequences are used for appointing different ternary sub-constellations.
And 2.2, presetting a TQAM signal constellation diagram according to a preset modulation order.
The different modulation orders can specify the triangular quadrature amplitude modulation TQAM signal constellation diagrams with different constellation point numbers. The same modulation order may specify different shapes of TQAM signal constellations, such as a regular TQAM signal constellation or an irregular TQAM signal constellation, etc.
And 2.3, carrying out multiple ternary subset division on the preset TQAM constellation diagram to obtain a preset number of ternary sub-constellation diagrams.
The rule for ternary subset partitioning is as follows:
finding the minimum distance between constellation points in a given TQAM signal constellation diagram, and recording the minimum distance as d0；
Finding the next smallest distance between constellation points, denoted d1Wherein d is1>d0Dividing the TQAM signal constellation diagram into 3 minimum distances d1The ternary sub-constellation of (a), called first order ternary subset;
finding a new sub-minimum distance d in the first order subset2Wherein d is2>d1>d0Dividing the first order ternary subsets into 3 minimum distances d2The ternary sub-constellation diagram of (a) is called a second-order ternary subset;
and repeating the steps until a preset number of ternary subsets are obtained.
And carrying out ternary subset division on the preset constellation diagram according to a preset rule to obtain a preset number of ternary subsets. Finally, the number of the constellation points of each subset is the same, and the Euclidean distance between adjacent constellation points is the same and the maximum.
Step three: and carrying out optical modulation on the complex signal to obtain an optical signal after modulation, and then sending the optical signal.
Step four: and the signal receiving end is used for receiving the optical signal sent by the signal transmitting end. And carrying out analog-to-digital conversion on the received optical signal to obtain a complex signal.
Step five: and calculating Euclidean distances between the received complex signals and each ternary sub-constellation diagram, selecting the minimum Euclidean distance as branch metrics, accumulating the branch metrics to obtain accumulated metric values of all states, selecting the minimum accumulated metric value, backtracking, and performing soft-decision Viterbi decoding to obtain third data.
Step six: and converting the third data into a bit sequence by a ternary symbol sequence to obtain fourth data, and then performing parallel-to-serial conversion on the fourth data to obtain an original data sequence.
Has the advantages that:
1. the method takes triangular quadrature amplitude modulation TQAM signals as an original constellation diagram, can effectively reduce the average power of signals sent by a system and increase the transmission distance of the system;
2. the invention applies ternary convolution code and ternary subset division, increases the minimum free distance between constellation points under the condition of increasing less complexity, reduces the error rate of transmission of the optical communication system, and realizes the improvement of the performance of the optical communication system.
Drawings
Fig. 1 is a schematic diagram of an optical communication system according to an embodiment of the present invention;
fig. 2 is a flow chart of a transmitting end of an optical communication system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating ternary subset partitioning according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a bit sequence to ternary symbol sequence conversion according to an embodiment of the present invention;
fig. 5 is a structural diagram of a ternary convolutional code according to an embodiment of the present invention;
fig. 6 is a flowchart of a receiving end of an optical communication system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. The technical problems and the advantages solved by the technical solutions of the present invention are also described, and it should be noted that the described embodiments are only intended to facilitate the understanding of the present invention, and do not have any limiting effect.
The embodiment of the invention takes a signal coding modulation method of ternary grid coding modulation 18-TTCM as an example to explain the working principle of the embodiment of the invention.
The following description of the embodiments of the present invention with reference to the drawings includes the following steps:
the method comprises the following steps: at a signal transmitting end, an original data sequence is obtained, and serial-parallel conversion is carried out on the original data sequence to obtain a preset number of paths of first data.
Referring to fig. 1, there is provided a schematic diagram of an optical communication system, the system comprising: signal transmitting terminal, fibre channel and signal receiving terminal.
Referring to fig. 2, at a signal transmitting end, an original data sequence is obtained, and the original data sequence is subjected to serial-to-parallel conversion to obtain a preset number of paths of first data. The preset number of the first data may be set according to actual requirements, for example, the preset number is set to 4 in the specific embodiment of the present invention, and correspondingly, if the first four bits of the original data are 0101, the information carried by the four paths of first data may be 0, 1, 0, and 1, respectively.
Step two: dividing the first data into two parts, wherein the first part of data is subjected to bit sequence to ternary symbol sequence conversion to obtain second data, and the second data is subjected to ternary convolution coding to obtain coding sequences, and different coding sequences are used for designating different ternary sub-constellations; the second part of data is used for appointing different constellation points of the ternary sub-constellation diagram, and the second part of data and the first part of data are jointly subjected to subset selection and diversity mapping to obtain a complex signal.
The preset constellation diagram adopts a triangular quadrature amplitude modulation 18TQAM signal constellation diagram, and the constellation diagram is subjected to ternary subset division for multiple times to obtain a preset number of ternary sub-constellation diagrams.
The rule for ternary subset partitioning is as follows:
finding the minimum distance between constellation points in a given TQAM signal constellation diagram, and recording the minimum distance as d0；
Finding the next smallest distance between constellation points, denoted d1Wherein d is1>d0Dividing the TQAM signal constellation diagram into 3 minimum distances d1The ternary sub-constellation of (a), called first order ternary subset;
finding a new sub-minimum distance d in the first order subset2Wherein d is2>d1>d0Dividing the first order ternary subsets into 3 minimum distances d2The ternary sub-constellation diagram of (a) is called a second-order ternary subset;
and repeating the steps until a preset number of ternary subsets are obtained.
In this embodiment, the original constellation diagram is divided into three subsets twice, so as to obtain the final 9 three-element sub-constellation diagrams. The minimum Euclidean distance of the original 18TQAM signal constellation diagram is d0Obtaining first-order ternary subsets through first ternary subset division, wherein each first-order ternary subset comprises 6 constellation points, and the Euclidean distance of the nearest neighbor constellation points
Obtaining 9 ternary sub-constellations through second ternary subset division, wherein the constellation in each constellationThe minimum Euclidean distance of a point is
The minimum Euclidean distance between the constellation points is changed into three times of the original Euclidean distance, so that the error rate of the optical communication system can be effectively reduced, and the system performance is improved.
Finally, the number of the constellation points of each subset is the same and is 2, and the average Euclidean distance between the constellation points is the same and the maximum.
Then, the first data is divided into two parts, in this embodiment, the first part of data is the first three ways of data of the first data, and the second part of data is the last way of data of the first data.
The first part of data is converted from a bit sequence to a ternary symbol sequence to obtain second data, the conversion has multiple choices, and different conversion modes have different efficiencies and error rates caused by single ternary symbol errors. To equalize efficiency and bit error rate, the present embodiment uses a 3B2T conversion, i.e., three bits into two ternary symbols, as shown in fig. 4. And carrying out ternary convolution coding on the second data to obtain coding sequences, wherein different coding sequences are used for appointing different ternary sub-constellations. I.e. to specify a particular one of the 9 ternary sub-constellations described above.
The second part of data is used for appointing different constellation points of the ternary sub-constellation diagram, and constellation selection and mapping are carried out together with the first part of data to obtain a complex signal. In this embodiment, a specific one of the 2 constellation points is selected for the second portion of data.
The ternary convolutional coding has multiple code rates, the code rate, the constraint length and the generating matrix of the ternary convolutional coding are selected according to the modulation order and the information redundancy, and then coding sequences are obtained, wherein different coding sequences are used for designating different ternary sub-constellation diagrams. As shown in fig. 5, the present embodiment employs a (2, 1, 2) ternary convolutional code.
Step three: and carrying out optical modulation on the complex signal to obtain an optical signal after modulation, and then sending the optical signal through an optical fiber channel.
Step four: and the signal receiving end is used for receiving the optical signal sent by the signal transmitting end. And carrying out analog-to-digital conversion on the received optical signal to obtain a complex signal.
Referring to fig. 6, the optical signal transmitted by the signal transmitting end is received at the signal receiving end.
The received optical signal is subjected to analog-to-digital conversion to obtain a complex signal.
Step five: and calculating Euclidean distances between the received complex signals and each ternary sub-constellation diagram, selecting the minimum Euclidean distance as branch metrics, accumulating the branch metrics to obtain accumulated metric values of all states, selecting the minimum accumulated metric value, backtracking, and performing soft-decision Viterbi decoding to obtain third data.
Step six: and converting the third data into a bit sequence by a ternary symbol sequence to obtain fourth data, and then performing parallel-to-serial conversion on the fourth data to obtain an original data sequence.
In the embodiment, a triangular quadrature amplitude modulation 18-TQAM signal is used as an original constellation diagram, and the minimum Euclidean distance of the original 18TQAM signal constellation diagram is d 02, with an average symbol energy of EST13.9, and the average symbol energy is E compared with the square quadrature amplitude modulation 18-SQAM with the equal modulation order and the minimum Euclidean distanceSS14.3, the present embodiment can effectively reduce the average power of the system sending signals and increase the transmission distance of the system.
In the embodiment, the ternary convolutional codes (2, 1, 2) and the corresponding ternary subsets are divided, and under the condition of increasing less complexity, the Euclidean distance of the nearest neighbor constellation points is changed to be three times of the original Euclidean distance, so that the transmission error rate of the optical communication system is effectively reduced, and the performance of the optical communication system is finally improved.
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.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A signal coding modulation method applied to an optical communication system, characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps: at a signal transmitting end, acquiring an original data sequence, and performing series-parallel conversion on the original data sequence to obtain first data of a preset number of paths;
step two: dividing the first data into two parts, wherein the first part of data is subjected to bit sequence to ternary symbol sequence conversion to obtain second data, and the second data is subjected to ternary convolution coding to obtain coding sequences, and different coding sequences are used for designating different ternary sub-constellations; the second part of data is used for appointing different constellation points of the ternary sub-constellation diagram, and performs subset selection and diversity mapping together with the first part of data to obtain a complex signal;
step three: performing optical modulation on the complex signal to obtain an optical signal after modulation, and then sending the optical signal;
step four: the signal receiving end is used for receiving the optical signal sent by the signal transmitting end; performing analog-to-digital conversion on the received optical signal to obtain a complex signal;
step five: calculating Euclidean distances between the received complex signals and each ternary sub-constellation diagram, selecting the minimum Euclidean distance as branch metrics, accumulating the branch metrics to obtain accumulated metric values of all states, selecting the minimum accumulated metric value, backtracking, and performing soft-decision Viterbi decoding to obtain third data;
step six: and converting the third data into a bit sequence by a ternary symbol sequence to obtain fourth data, and then performing parallel-to-serial conversion on the fourth data to obtain an original data sequence.
2. A signal coding modulation method applied to an optical communication system, characterized in that: the implementation method of the second step is that,
2.1 carrying out ternary convolution coding according to the second data;
the ternary convolutional coding has various different formats, and the code rate, the constraint length and the generating matrix of the ternary convolutional coding are selected according to the modulation order and the information redundancy, so that the free Euclidean distance is maximized; passing the second data through a ternary convolution encoder to obtain coding sequences, wherein different coding sequences are used for designating different ternary sub-constellations;
2.2 presetting a TQAM signal constellation diagram according to a preset modulation order;
the triangular quadrature amplitude modulation TQAM signal constellation diagrams with different constellation point numbers can be appointed by different modulation orders; the same modulation order can specify TQAM signal constellations of different shapes, such as a regular TQAM signal constellation or an irregular TQAM signal constellation;
2.3, carrying out multiple ternary subset division on the preset TQAM constellation map to obtain a preset number of ternary sub-constellation maps;
the rule for ternary subset partitioning is as follows:
finding the minimum distance between constellation points in a given TQAM signal constellation diagram, and recording the minimum distance as d0；
Finding the next smallest distance between constellation points, denoted d1Wherein d is1>d0Dividing the TQAM signal constellation diagram into 3 minimum distances d1The ternary sub-constellation of (a), called first order ternary subset;
finding a new sub-minimum distance d in the first order subset2Wherein d is2>d1>d0Dividing the first order ternary subsets into 3 minimum distances d2The ternary sub-constellation diagram of (a) is called a second-order ternary subset;
repeating the steps until a preset number of ternary subsets are obtained;
dividing the ternary subsets of the preset constellation diagram according to a preset rule to obtain a preset number of ternary subsets; finally, the number of the constellation points of each subset is the same, and the Euclidean distance between adjacent constellation points is the same and the maximum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111472758.1A CN114389708B (en) | 2021-12-01 | 2021-12-01 | Signal code modulation method applied to optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111472758.1A CN114389708B (en) | 2021-12-01 | 2021-12-01 | Signal code modulation method applied to optical communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114389708A true CN114389708A (en) | 2022-04-22 |
| CN114389708B CN114389708B (en) | 2023-10-27 |
Family
ID=81196080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111472758.1A Active CN114389708B (en) | 2021-12-01 | 2021-12-01 | Signal code modulation method applied to optical communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114389708B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116405120A (en) * | 2023-03-28 | 2023-07-07 | 中国矿业大学 | CSK coding method based on symbol sequence |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070108105A (en) * | 2007-09-27 | 2007-11-08 | 강릉대학교산학협력단 | Method and apparatus for detecting receiving signal using triangular constellation |
| KR20080104883A (en) * | 2007-05-29 | 2008-12-03 | 강릉대학교산학협력단 | Method and apparatus for efficient mapping bits on triangular constellation |
| CN103107858A (en) * | 2011-11-15 | 2013-05-15 | 中国科学院研究生院 | Coding and decoding method of length-variable symbol level joint information source channel and multi-dimensional modulation |
| US20150103956A1 (en) * | 2012-06-27 | 2015-04-16 | Huawei Technologies Co., Ltd. | High order modulation method, demapping method, and corresponding device |
| CN110176962A (en) * | 2019-05-17 | 2019-08-27 | 北京邮电大学 | Optical signal processing method and device based on the forming of TCM- probability |
| CN111163030A (en) * | 2019-12-19 | 2020-05-15 | 南京信息工程大学 | Optical probability forming method based on dense constellation reduced-order index |
-
2021
- 2021-12-01 CN CN202111472758.1A patent/CN114389708B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080104883A (en) * | 2007-05-29 | 2008-12-03 | 강릉대학교산학협력단 | Method and apparatus for efficient mapping bits on triangular constellation |
| KR20070108105A (en) * | 2007-09-27 | 2007-11-08 | 강릉대학교산학협력단 | Method and apparatus for detecting receiving signal using triangular constellation |
| CN103107858A (en) * | 2011-11-15 | 2013-05-15 | 中国科学院研究生院 | Coding and decoding method of length-variable symbol level joint information source channel and multi-dimensional modulation |
| US20150103956A1 (en) * | 2012-06-27 | 2015-04-16 | Huawei Technologies Co., Ltd. | High order modulation method, demapping method, and corresponding device |
| CN110176962A (en) * | 2019-05-17 | 2019-08-27 | 北京邮电大学 | Optical signal processing method and device based on the forming of TCM- probability |
| CN111163030A (en) * | 2019-12-19 | 2020-05-15 | 南京信息工程大学 | Optical probability forming method based on dense constellation reduced-order index |
Non-Patent Citations (1)
| Title |
|---|
| YUANZHOU ZHANG 等: "New Efficient Four-Dimensional Trellis Coded Modulation Format", 2021 19TH INTERNATIONAL CONFERENCE ON OPTICAL COMMUNICATIONS AND NETWORKS (ICOCN) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116405120A (en) * | 2023-03-28 | 2023-07-07 | 中国矿业大学 | CSK coding method based on symbol sequence |
| CN116405120B (en) * | 2023-03-28 | 2023-11-21 | 中国矿业大学 | CSK coding method based on symbol sequence |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114389708B (en) | 2023-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0200505B1 (en) | Apparatus for transmitting streams of information bits and methods for estimating the most likely sequence sent | |
| JP3612563B2 (en) | Multi-mode block coding modulation demodulation method | |
| US5301209A (en) | Multidimensional trellis-coded modulation for fading channels | |
| US4713829A (en) | Coded modulation system with a simplified decoder capable of reducing the effects of channel distortion | |
| US7224743B2 (en) | Efficient decoding of trellis coded modulation waveforms | |
| CN111628789A (en) | Signal generation method and device based on mixed probability shaping and geometric shaping | |
| WO2009006812A1 (en) | Encoding modulation method,decoding method and apparatus of trellis coded modulation code | |
| US6516037B1 (en) | Multilevel coding with time diversity | |
| US4993046A (en) | Coded modulation communication system | |
| CN108494719B (en) | Constellation mapping method and demapping method | |
| CN109104250B (en) | Star 24QAM mapping-based optical probability forming coding method | |
| US8612837B1 (en) | BM/LLR computations for multi-dimensional TCM/BCM codes | |
| WO2007010376A2 (en) | Adaptive multilevel block coded modulation for ofdm systems | |
| CN108270515A (en) | Coding method and device | |
| EP0827309B1 (en) | Coded modulation using repetition and tree codes | |
| CN101299746B (en) | Method and device for mapping/de-mapping constellation as well as linear transformation constellation map | |
| CN112600568B (en) | Code modulation transmission method combining nonstandard 6-order modulation and LDPC code | |
| KR20080092458A (en) | Coded modulation for partially coherent systems | |
| CN103516465B (en) | Coded modulation and demodulation and demodulation and decoding method, device and system | |
| CN116346239B (en) | Rectangular constellation coding method based on probability shaping high-order QAM coherent optical communication system | |
| CN114389708B (en) | Signal code modulation method applied to optical communication system | |
| CN111064521B (en) | Multi-dimensional orthogonal coding modulation method based on code division probability shaping | |
| CN116405120B (en) | CSK coding method based on symbol sequence | |
| CN1340262A (en) | Termination of coded or uncoded modulation with path-oriented decoder | |
| US20110116574A1 (en) | Trellis coded modulation with periodically-reduced signal constellations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |