CN111988111A - Channel coding method applied to power line broadband carrier system - Google Patents
Channel coding method applied to power line broadband carrier system Download PDFInfo
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- CN111988111A CN111988111A CN201910431787.XA CN201910431787A CN111988111A CN 111988111 A CN111988111 A CN 111988111A CN 201910431787 A CN201910431787 A CN 201910431787A CN 111988111 A CN111988111 A CN 111988111A
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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- 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
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- H—ELECTRICITY
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- 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
- H04L1/0071—Use of interleaving
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Abstract
A channel coding method applied to a power line broadband carrier system, the method comprising: the physical layer receives the medium access control layer information and generates original data needing to be transmitted by the physical layer; selecting an interleaving mapping index table, interleaver parameters and a state transformation matrix of a convolutional coding register according to the medium access control layer information; calculating the relationship between the interleaver parameters and the interleaving mapping addresses according to the determined interleaving mapping index table to obtain an interleaving pattern of the interleaver, and interleaving the original data to obtain interleaving data; pre-coding original data and interleaved data to obtain a termination state of a convolutional coding register, and transforming the termination state of the register according to a convolutional coding register state transformation matrix to obtain an initial state of the convolutional coding state register; actually encoding the original data and the interweaved data according to the initial state of the state register to obtain check data; determining a punching pattern of the check data according to the medium access control layer information, and punching the check data; and finally, multiplexing the original data and the punched check data to obtain final coded data.
Description
Technical Field
The invention belongs to the technical field of power line carrier communication, and particularly relates to a channel coding method applied to a power line broadband carrier system.
Background
The power supply network is one of three networks which are the most perfect and popular in application at present, and has very important practical value for carrying out data communication and transmitting various information. However, the fast fading of power lines, the strong noise communication environment, and the wide application of power lines as data communication carriers have very severe limitations. The power line broadband carrier communication based on the Orthogonal Frequency Division Multiplexing (OFDM) technology puts forward higher requirements on the anti-attenuation capability, the Frequency band utilization rate, the strong anti-intersymbol interference capability and the like of a communication system, and is widely applied to automatic meter reading of a power line, power grid load control, power supply management and the like.
Channel coding techniques are an effective means to improve the reliability of data communications. The joint use of the orthogonal frequency division multiplexing technology and the channel coding technology is an important method for improving the performance of the power carrier communication system. The Turbo code is an important channel coding method, combines the advantages of a convolutional encoder and a random interleaver, introduces the idea of random coding into the coding method, and is an important development of channel coding research. The random interleaving characteristic of the Turbo code encoder expands the noise-resistant length of forward error correction, obtains the decoding performance approaching Shannon tolerance and greatly improves the coding gain of a communication system. Where the choice of convolutional encoder polynomial and random interleaver are key parameters for the coding gain.
The invention provides a convolutional encoder polynomial and a corresponding interleaving mapping table, which are used for the dual-binary Turbo channel coding research of a power line broadband carrier communication system.
Disclosure of Invention
In order to solve the problems in the background art, the present invention provides a channel coding method applied to a power line broadband carrier communication system, wherein the method comprises the following steps:
step 4, precoding according to the original data and the interleaved data obtained in the step 3 to obtain 2 independent termination states of the convolutional coding state register;
Step 6, according to the initial state of the convolution coding register obtained in the step 5, actual coding is respectively carried out on the original data and the interweaved data, and 2 paths of independent check data are obtained;
step 7, punching the check data obtained in the step 6 according to the code rate type determined in the step 1;
step 8, multiplexing the original data and the punched check data obtained in the step 7 to obtain final coded data;
further, the medium access control layer information received by the physical layer in step 1 includes a data block type and a code rate. The data block types related in the invention are PB16, PB72, PB136, PB256 and PB520, and the data block lengths are represented as 16 bytes, 72 bytes, 136 bytes, 256 bytes and 520 bytes, respectively. The code rate involved in the present invention has two cases of 1/2 and 16/18.
Further, the interleaving mapping index table in step 2 has 5 different types, which respectively correspond to 5 different data block types.
Type 1): when the data block type is PB16, interleaving mapping index table S
Type 2): when the data block type is PB72, interleaving mapping index table S
Type 3): when the data block type is PB136, the interleaving mapping index table S
Type 4): when the data block type is PB256, the interleaving mapping index table S
Type 5): when the data block type is PB520, the interleaving mapping index table S
Further, there are 3 different types of the convolutional encoding state register transform matrix in step2, where PB16, PB72, PB520 correspond to the same convolutional encoding state register transform matrix, and PB136 and PB256 correspond to one convolutional encoding state register transform matrix, respectively. Hereinafter, the convolution encoding state register transformation matrix is collectively referred to as a tail-biting matrix S _ tail.
Type 1) when the data block types are PB16, PB72, PB520,
type 2) when the data block type is PB136,
type 3) when the data block type is PB256,
further, the data interleaving in step3 includes two main parts.
part 1: the original data is interleaved between two bit groups. That is, the original data is interleaved between groups in units of 2 bits according to the interleaving mapping pattern.
step1) determines the corresponding interleaver parameter according to the data block type in step 1.
step2) calculates the interleaving pattern of the inter-group interleaving according to the interleaver parameters determined by step1) and the interleaving mapping index table determined by the step 2). Where the calculated relationship of the interleaving pattern to the interleaver parameters is denoted as I (x).
I(x)＝[S(xmodN)-(xdivN)*N+L]modL(x＝0,1,...L-1)
step3) transforms the data at the original data position I (x) to position x according to the interleaving pattern determined by step2) to achieve inter-group interleaving.
part 2: the interclass interleaved data obtained by part1 is subjected to intraclass interleaving. When the position x is an even number, 2-bit data is converted into a position; when the position x is an odd number, the 2-bit data position is unchanged.
The specific algorithm of the intra-group interleaving is expressed as
if(xmod2＝＝0)
IntData(2·x)＝Data(2·I(x)+1)
IntData(2·x+1)＝Data(2·I(x))
else
IntData(2·x)＝Data(2·I(x))
IntData(2·x+1)＝Data(2·I(x)+1)
Wherein Data () represents the interleaver input and IntData () represents the interleaver output, it should be noted that when the output address is even after interleaving between groups, the 0 th bit and the 1 st bit of the corresponding interleaved information bit pair need to exchange positions.
Further, the 2 paths of independent check data obtained in step 7 are respectively represented as a p-branch path and a q-branch path. The puncturing is performed in units of 8-bit data, where 1 indicates that no puncturing is performed at the corresponding position, and 0 indicates that puncturing is performed at the corresponding position.
Type 1) when the code rate is 1/2, the puncturing pattern is recorded as
Type 2) when the code rate is 16/18, the puncture pattern is recorded as
Further, the tail-biting matrix in the step 5 corresponds to 3 types of state transition relationships.
Type 1) when the data block types are PB16, PB72, PB520,
type 2) when the data block types are PB136, PB72, PB520,
type 3) when the data block type is PB256,
further, the convolutional encoding polynomial matrix in step 4 is denoted as S _ conv.
Furthermore, in the actual encoding process in step 6, the start state and the end state of the convolutional encoding register are consistent. If the start state and the end state of the convolutional encoding register are not consistent, the encoding process fails.
According to another aspect of the present invention, the present invention provides a channel coding method applied to a power line broadband carrier system, wherein the system comprises:
the data generating unit is used for receiving the medium access control layer information through the physical layer and generating original data needing to be transmitted by the physical layer;
and the parameter selection unit determines an interleaving mapping index table, interleaver parameters and a convolutional coding state register transformation matrix according to the data block type.
And the interleaving unit is used for calculating an interleaver pattern according to the determined interleaving mapping index table, the interleaver parameters and the interleaving address mapping relation and interleaving the original data.
And the pre-coding unit, the original data and the interleaved data respectively pass through two cyclic redundancy convolutional encoders to obtain the termination state of the convolutional encoding register.
And the register state transformation unit is used for transforming the termination state of the convolutional coding register of the pre-coding unit by using the tail-biting matrix corresponding to the data block type to obtain the actual coding start state.
And the actual coding unit initializes the convolution coding register according to the actual coding initial state, recodes the original data and the interweaved data and respectively obtains 2 paths of independent check data.
And the punching unit is used for determining a punching pattern according to the type of the coding code rate and punching the coded check data.
And the multiplexing unit is used for multiplexing the original data and the check data to obtain final coded data.
The channel coding method applied to the power line broadband carrier communication system, provided by the invention, carries out channel coding aiming at different data block types and different code rate types, thereby improving the coding gain of the system.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a channel coding method applied to a power line broadband carrier system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a dual binary Turbo encoder according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a convolver according to an embodiment of the invention;
FIG. 4 is a graphical representation of the results of an experiment according to an embodiment of the present invention;
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a channel coding method applied to a power line broadband carrier system according to an embodiment of the present invention. As shown in fig. 1, the channel coding method applied to the power line broadband carrier system starts from step S101.
In step S101, the physical layer receives the medium access control layer information and generates original data that the physical layer needs to transmit. The medium access control layer information received by the physical layer comprises a data block type and a code rate type.
In step S102, an interleaving mapping index table, interleaver parameters and a tail-biting matrix are selected according to the data block type of the mac layer information.
In step S103, an interleaving pattern is calculated according to the determined interleaving mapping index table, the interleaver parameter and the interleaving mapping address correspondence, and the original data is interleaved.
In step S104, the original data and the interleaved data are pre-encoded, respectively, to obtain 2 independent termination states of the convolutional encoding registers.
In step S105, the termination state of the convolutional encoding register obtained in step S104 is transformed according to the determined tail-biting matrix, so as to obtain the initial state of the convolutional encoding register in the actual encoding process.
In step S106, the original data and the interleaved data are actually encoded according to the initial state of the convolutional coding register obtained in step S105, so as to obtain 2 independent check data.
In step S107, a puncturing pattern of the check data is determined according to the coding rate type of the mac layer information, and the check data is punctured.
In step S108, the original data and the punctured verification data are multiplexed to obtain the final encoded data.
FIG. 2 is a schematic structural diagram of a dual binary Turbo encoder according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a convolutional encoder structure according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an experimental result of a channel coding method based on a power line broadband carrier system according to an embodiment of the present invention.
In order to verify the effect of the present invention, the following description is further made in conjunction with simulation experiments.
The simulation conditions of fig. 4 are: the data block types are PB16, PB72, PB136, PB256 and PB520 respectively, and the coding code rate is 1/2. The channel used in the simulation is typically a white gaussian noise channel. The horizontal axis represents the signal-to-noise ratio in dB and the vertical axis represents the bit error rate. In fig. 4, a dotted curve indicated by a square represents an error rate curve of PB16, a dashed curve indicated by a circle represents an error rate curve of PB72, a dotted curve indicated by a five-star represents an error rate curve of PB136, a solid curve indicated by a plus sign represents an error rate curve of PB256, and a dashed curve indicated by no sign represents an error rate curve of PB 520. As can be seen from the simulation experiment result of fig. 4, the error code performance of different data block types is inconsistent, and the larger the data block length is, the better the error code performance is. The larger the data block length, the larger the interleaving depth, which can provide higher coding gain. As can be seen from the simulation experiment result of fig. 4, the channel coding method can well resist channel noise, and the reliability of the system is greatly improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A channel coding method applied to a power line broadband carrier system is characterized by comprising the following steps:
step 1, a physical layer receives medium access control layer information and generates original data needing to be transmitted by the physical layer;
step 2, obtaining an interleaving mapping index table and a convolution coding state register transformation matrix of the interleaver according to the data block type determined in the step 1;
step 3, according to the interleaving mapping index table determined in the step 2, the interleaver parameters and the interleaving address calculation relationship, interleaving mapping addresses corresponding to different data block types are obtained, and original data are interleaved;
step 4, precoding according to the original data and the interleaved data obtained in the step 3 to obtain 2 independent termination states of the convolutional coding state register;
step 5, according to the state transformation matrix of the convolutional coding register determined in the step 2, transforming the termination state of the convolutional coding register obtained in the step 4 to obtain the initial state of the convolutional coding register in the actual coding process;
Step 6, according to the initial state of the convolution coding register obtained in the step 5, actual coding is respectively carried out on the original data and the interweaved data, and 2 paths of independent check data are obtained;
step 7, punching the check data obtained in the step 6 according to the code rate type determined in the step 1;
and 8, multiplexing the original data and the punched check data obtained in the step 7 to obtain final coded data.
2. The method of claim 1, wherein the medium access control layer information received by the physical layer comprises a data block type and a code rate type.
3. The method of claim 1, wherein the interleaving map index table is determined according to different data block types.
When the data block type is PB16, the interleaving map index table is,
when the data block type is PB72, the interleaving map index table is,
when the data block type is PB136, the interleaving map index table is,
when the data block type is PB256, the interleaving map index table is,
when the data block type is PB520, the interleaving map index table is,
4. the method of claim 1, wherein interleaver parameters are determined based on different data block types.
5. The method of claim 1, wherein the convolutional encoding register state transform matrix is determined based on different data block types.
When the data block types are PB16, PB72, PB520,
when the data block type is PB136,
when the data block type is PB256,
6. a channel coding method applied to a power line broadband carrier system, the system comprising:
the data generating unit is used for receiving the medium access control layer information through the physical layer and generating original data needing to be transmitted by the physical layer;
and the parameter selection unit determines an interleaving mapping index table, interleaver parameters and a convolutional coding state register transformation matrix according to the data block type.
And the interleaving unit is used for calculating an interleaver pattern according to the determined interleaving mapping index table, the interleaver parameters and the interleaving address mapping relation and interleaving the original data.
And the pre-coding unit, the original data and the interleaved data respectively pass through two cyclic redundancy convolutional encoders to obtain the termination state of the convolutional encoding register.
And the register state transformation unit is used for transforming the termination state of the convolutional coding register of the pre-coding unit by using the tail-biting matrix corresponding to the data block type to obtain the actual coding start state.
And the actual coding unit initializes the convolution coding register according to the actual coding initial state, recodes the original data and the interweaved data and respectively obtains 2 paths of independent check data.
And the punching unit is used for determining a punching pattern according to the type of the coding code rate and punching the coded check data.
And the multiplexing unit is used for multiplexing the original data and the check data to obtain final coded data.
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| US20160323130A1 (en) * | 2015-04-28 | 2016-11-03 | Thomas J. Kenney | Apparatus, computer readable medium, and method for an interleaver for higher quadrature amplitude modulation (qam) in a high efficiency wireless local-area network |
| CN106603457A (en) * | 2016-12-09 | 2017-04-26 | 中国电力科学研究院 | Broadband power line carrier communication physical layer signal processing method based on OFDM |
| CN107395546A (en) * | 2017-08-30 | 2017-11-24 | 重庆物奇科技有限公司 | The method for carrying out frequency domain information extension in power line carrier communication to data symbol |
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