CN116388869A - Cascade coding-based optical wireless communication method, system and storage medium - Google Patents
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Abstract
The invention discloses an optical wireless communication method, an optical wireless communication system and a storage medium based on cascade coding, which are applied to the technical field of communication and can effectively reduce the error rate of optical wireless communication and improve the communication reliability. The method comprises the following steps: carrying out preset outer code coding on data to be transmitted to obtain outer code coded data; the preset outer code comprises a multi-element Zipper code; performing preset internal code coding according to the external code coding data to obtain internal code coding data; the preset inner code codes comprise BCH code codes; inputting the inner code coding data into an optical wireless communication channel for transmission; acquiring corresponding received data at a receiving end of an optical wireless communication channel; when receiving the received data, performing preset internal code decoding on the received data to obtain internal code decoded data; the preset inner code decoding corresponds to the preset inner code encoding; performing preset outer code decoding on the inner code decoding data to obtain target transmission data; the preset outer code decoding corresponds to the preset outer code encoding.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an optical wireless communication method, system, and storage medium based on cascade coding.
Background
Due to the rapid development of solid state lighting technology, optical wireless communication (optical wireless communication, OWC) has received unprecedented attention. Optical wireless communications can utilize free and mostly unused wireless transmission resources in the infrared and visible spectrum. For indoor scenarios, the optical wireless communication system can alleviate the problem of shortage of radio frequency spectrum resources used in conventional wireless communication systems. Compared with radio frequency communication, the optical wireless communication has the advantages of rich spectrum resources, no traditional electromagnetic interference and the like. However, in the related art, the error rate of the optical wireless communication is high, and the complexity of decoding is also high due to the overlong encoding, so that the reliability of the optical wireless communication is low. How to effectively reduce the error rate of optical wireless communication and improve the communication reliability becomes a problem to be solved.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides an optical wireless communication method, system and storage medium based on cascade coding, which can effectively reduce the error rate of optical wireless communication and improve the communication reliability.
In one aspect, an embodiment of the present invention provides an optical wireless communication method based on cascade coding, including the following steps:
carrying out preset outer code coding on data to be transmitted to obtain outer code coded data; wherein the preset outer code comprises a multi-element Zipper code;
performing preset internal code coding according to the external code coding data to obtain internal code coding data; wherein the preset inner code comprises BCH code;
inputting the inner code coded data into an optical wireless communication channel for transmission; the receiving end of the optical wireless communication channel acquires corresponding received data;
when the received data is received, performing preset internal code decoding on the received data to obtain internal code decoded data; wherein the preset inner code decoding corresponds to the preset inner code encoding;
performing preset outer code decoding on the inner code decoding data to obtain target transmission data; wherein the preset outer code decoding corresponds to the preset outer code encoding.
According to the optical wireless communication method based on cascade coding, the optical wireless communication method based on cascade coding has at least the following beneficial effects: according to the method, firstly, the multi-element Zipper code is used for encoding the data to be transmitted, so that the problem of poor optical wireless communication error rate performance is solved in a multi-element Zipper code encoding mode. Then, the embodiment performs preset inner code encoding according to the obtained outer code encoding data. The preset inner code codes comprise BCH code codes, and the embodiment reduces the error rate by taking the multi-element Zipper code as an outer code and taking the BCH code as an inner code to carry out cascade coding. Further, in this embodiment, the inner code encoded data obtained through the preset outer code encoding and the preset inner code encoding is input to the optical wireless communication channel for transmission, and the data transmitted by the channel is received at the receiving end of the optical wireless communication channel. When receiving the received data, the embodiment decodes the received data in a mode of preset inner code decoding and preset outer code decoding to obtain target transmission data, thereby realizing optical wireless communication, effectively reducing the error rate and improving the reliability of the optical wireless communication.
According to some embodiments of the present invention, the performing preset outer code encoding on the data to be transmitted to obtain outer code encoded data includes:
filling the data to be transmitted into the corresponding position of the real set to obtain a real set information symbol;
copying symbols from the real set information symbols corresponding to the preset code words according to the staggered mapping relation, and filling the copied symbols into corresponding positions in the virtual set to obtain virtual set information symbols;
and coding through a Solomon code according to the real set information symbol and the virtual set information symbol to obtain the outer code coding data.
According to some embodiments of the invention, the performing the preset outer code decoding on the inner code decoded data to obtain target transmission data includes:
performing codeword verification on the inner code decoding data through a Solomon code decoding algorithm to obtain a verification result;
adding a check mark to each codeword in the inner code decoding data according to the check result; wherein the check mark comprises a check passing and check error;
decoding the code word with the check mark as check error in the internal code decoding data, and modifying the corresponding check mark into check passing;
and traversing each codeword, and returning to the step of decoding the codeword with the check mark as the check error in the internal code decoding data and modifying the corresponding check mark as the pass check when the codeword with the check mark as the check error exists.
According to some embodiments of the present invention, the decoding the codeword with the check flag as the check error in the inner code decoded data and modifying the corresponding check flag as the pass of the check includes:
when the number of error code words obtained through the verification of the Solomon code decoding algorithm is larger than the maximum error correction symbol number, modifying the verification mark corresponding to the error code words into verification passing;
or when the number of the error code words obtained through verification by the Solomon code decoding algorithm is smaller than or equal to the maximum error correction symbol number, performing error correction and verification by the Solomon code decoding algorithm, and modifying the verification mark corresponding to the error code words into verification passing.
According to some embodiments of the invention, before performing the step of performing the preset inner code encoding according to the outer code encoded data to obtain inner code encoded data, the method further includes:
the outer code encoded data is interleaved by an interleaver.
According to some embodiments of the invention, before performing the step of transmitting the inner code encoded data into an optical wireless communication channel, the method further comprises:
and carrying out spatial modulation according to the inner code coding data to obtain spatial modulation data.
According to some embodiments of the invention, the performing preset inner code encoding according to the outer code encoded data to obtain inner code encoded data includes:
storing each codeword of the outer code encoded data into a corresponding data in a buffer area, and constructing to obtain a buffer matrix;
and carrying out BCH code encoding on each column of the buffer matrix to obtain the inner code encoded data.
On the other hand, the embodiment of the invention also provides an optical wireless communication system based on cascade coding, which comprises the following steps:
the external coding module is used for carrying out preset external code coding on the data to be transmitted to obtain external code coded data; wherein the preset outer code comprises a multi-element Zipper code;
the inner coding module is used for carrying out preset inner code coding according to the outer code coding data to obtain inner code coding data; wherein the preset inner code comprises BCH code;
the channel module is used for inputting the inner code coded data into an optical wireless communication channel for transmission; the receiving end of the optical wireless communication channel acquires corresponding received data;
the internal decoding module is used for carrying out preset internal code decoding on the received data when the received data are received, so as to obtain internal code decoded data; wherein the preset inner code decoding corresponds to the preset inner code encoding;
the outer decoding module is used for carrying out preset outer code decoding on the inner code decoding data to obtain target transmission data; wherein the preset outer code decoding corresponds to the preset outer code encoding.
On the other hand, the embodiment of the invention also provides an optical wireless communication system based on cascade coding, which comprises the following steps:
at least one processor;
at least one memory for storing at least one program;
the at least one program, when executed by the at least one processor, causes the at least one processor to implement the cascade coding-based optical wireless communication method as described in the above embodiments.
In another aspect, an embodiment of the present invention further provides a computer storage medium, in which a program executable by a processor is stored, where the program executable by the processor is used to implement the optical wireless communication method based on cascade coding according to the above embodiment.
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Fig. 1 is a flowchart of an optical wireless communication method based on cascade coding according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of an optical wireless communication system based on cascade coding according to an embodiment of the present invention.
Detailed Description
The embodiments described in the present application should not be construed as limitations on the present application, but rather as many other embodiments as possible without inventive faculty to those skilled in the art, are intended to be within the scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.
Before describing embodiments of the present application, related terms referred to in the present application will be first described.
Optical wireless communication (optical wireless communication, OWC): is a form of optical communication in which non-guided visible light, infrared (IR), or Ultraviolet (UV) light is used to transmit signals. The optical wireless communication is used as a novel communication technology, has the advantages of optical fiber communication and mobile communication, can realize broadband transmission, is flexible in networking, does not need frequency application, and is good in electromagnetic interference resistance and confidentiality, so that the research on wireless optical communication is widely paid attention to nowadays.
Concatenated codes: for systems with multiple encodings, each level of encoding is considered an overall encoding, known as a concatenated code. The basic idea of serial concatenated codes is: the process of coding the long codes is completed in a grading way, so that the error correction capability of the error correction code is improved by using a short code cascading method. When two codes are concatenated to form a concatenated code, the code in the generalized channel is referred to as an inner code, and the channel code using the generalized channel as a channel is referred to as an outer code.
The Zipper code: is a new framework for describing the space coupling product codes, and has three main components including: the Zipper pairs, the interleaving map, and the constituent codes. Wherein each codeword of the Zipper code is a codeword of a constituent code, which is typically a forward error correction code.
Due to the rapid development of solid state lighting technology, optical wireless communication (optical wireless communication, OWC) has received unprecedented attention. Optical wireless communications can utilize free and mostly unused wireless transmission resources in the infrared and visible spectrum. For indoor scenarios, the optical wireless communication system can alleviate the problem of shortage of radio frequency spectrum resources used in conventional wireless communication systems. Compared with radio frequency communication, the optical wireless communication has the advantages of rich spectrum resources, no traditional electromagnetic interference and the like. However, in the related art, the error rate of the optical wireless communication is high, and the complexity of decoding is also high due to the overlong encoding, so that the reliability of the optical wireless communication is low. How to effectively reduce the error rate of optical wireless communication and improve the communication reliability becomes a problem to be solved.
Based on the above, an embodiment of the invention provides an optical wireless communication method, an optical wireless communication system and a storage medium based on cascade coding, which can effectively reduce the error rate of optical wireless communication and improve the communication reliability. Referring to fig. 1, the method of the embodiment of the present invention includes, but is not limited to, step S110, step S120, step S130, step S140, and step S150.
Specifically, the method application process of the embodiment of the invention includes, but is not limited to, the following steps:
s110: and carrying out preset outer code coding on the data to be transmitted to obtain outer code coded data. Wherein the preset outer code comprises a multi-element Zipper code.
S120: and carrying out preset inner code coding according to the outer code coding data to obtain inner code coding data. Wherein the preset inner code comprises BCH code.
S130: the inner code encoded data is input to an optical wireless communication channel for transmission. And acquiring corresponding received data at a receiving end of the optical wireless communication channel.
S140: and when receiving the received data, performing preset internal code decoding on the received data to obtain internal code decoded data. Wherein the preset inner code decoding corresponds to the preset inner code encoding.
S150: and performing preset outer code decoding on the inner code decoding data to obtain target transmission data. Wherein the preset outer code decoding corresponds to the preset outer code encoding.
In the working process of the specific embodiment, the embodiment firstly performs preset outer code encoding on the data to be transmitted to obtain outer code encoded data. Specifically, the preset outer code in this embodiment includes a multiple Zipper code. In the embodiment, the multi-system Zipper code is used as the cascade code outer code, and the reliability of the forward error correction of the multi-system code can be improved by applying the multi-system Zipper code to the optical wireless communication system. Further, in this embodiment, the preset inner code encoding is performed according to the outer code encoded data, so as to obtain inner code encoded data. Specifically, the preset inner code codes in this embodiment include BCH code codes. In the embodiment, the cascade coding mode is performed by taking the multi-element Zipper code as the outer code of the cascade code and taking the BCH code as the inner code of the cascade code, so that channel errors are corrected, and the reliability of transmission is improved. It is readily appreciated that as the requirements for data transmission rates in optical wireless communications increase, better forward error correction schemes are needed to increase the reliability of the transmission. The conventional single coding mode is difficult to meet the requirements of optical wireless communication. In this embodiment, the multi-element Zipper code is used as the outer code, and the BCH code is used as the inner code, so that when the optical wireless communication channel generates a small amount of random errors, the correction is performed by the inner code BCH code. When a longer random error is generated, the error correction capability of the BCH code is exceeded, and at this time, the correction can be performed through the outer code. For example, when the inner code decoder generates errors, several errors may occur in the output codeword, but for the outer code multi-bit Zipper code, only a few symbols of errors can be corrected by the outer code decoder. Then, the embodiment inputs the inner code encoded data obtained by the preset outer code encoding and the preset inner code encoding into the optical wireless communication channel for transmission. Meanwhile, the embodiment obtains corresponding received data at the receiving end of the optical wireless communication channel. In this embodiment, the inner code encoded data is input to the transmitting end of the optical wireless communication channel for transmission, and the receiving end receives the data transmitted through the optical wireless communication channel. Further, when the receiving end receives the received data, the embodiment first performs preset inner code decoding on the received data to obtain inner code decoded data. Specifically, in this embodiment, the preset inner code decoding corresponds to the preset inner code encoding, and in this embodiment, BCH code decoding is performed on the received data. Then, the embodiment performs preset outer code decoding on the inner code decoded data to obtain target transmission data. Correspondingly, in the embodiment, the preset outer code decoding corresponds to the preset outer code encoding, the target transmission data is obtained by decoding the inner code decoding data through the multiple Zipper codes, the optical wireless communication is realized, and the error rate is effectively reduced and the reliability of the optical wireless communication is improved through the encoding mode of taking the BCH code as the inner code and taking the multiple Zipper codes as the cascade codes of the outer code.
In some embodiments of the present invention, the data to be transmitted is subjected to preset outer code encoding to obtain outer code encoded data, including but not limited to:
and filling the data to be transmitted into the corresponding position of the real set to obtain the real set information symbol.
And copying symbols from the real set information symbols corresponding to the preset code words according to the staggered mapping relation, and filling the copied symbols into corresponding positions in the virtual set to obtain the virtual set information symbols.
And encoding by the Solomon code according to the real set information symbol and the virtual set information symbol to obtain outer code encoded data.
In the present embodimentIn this embodiment, the multiple user codes are constructed by combining the user codes and the Solomon codes (RS codes), and the multiple user codes are used as the outer codes of the cascade codes to perform preset outer code encoding, so as to obtain outer code encoded data. Specifically, in this embodiment, first, data to be transmitted is filled in a corresponding position of a real set, so as to obtain a real set information symbol. Illustratively, the spatially coupled codes applied to the slider code frame define an interleaving mapping relationship, and the present embodiment assumes that the period of the interleaving mapping is v. Taking the ith codeword as an example, when the check bit length of the codeword is r and the information bit length is n-r, the embodiment first generates n-r-m from the source i Filling the actual corresponding position with information symbols
Then, the embodiment copies the symbols from the real set information symbols corresponding to the preset codeword according to the interleaving mapping relation and fills the copied symbols into the corresponding positions in the virtual set, thereby obtaining the virtual set information symbols. Illustratively, the present embodiment copies the symbol-filled dummy set ++from the real set of the first v-1 codewords according to the interleaving mapping relationship>
Corresponding m of (a) i Personal position->
It will be readily appreciated that n-r-m is generated in conjunction with the source i Information symbols and m obtained by interleaving mapping i The present embodiment obtains n-r information symbols c of the codeword i，0 ，c i，1 ，...，c i，n-r-1 . Further, in this embodiment, the outer code encoded data is obtained by performing the coding of the Solomon code according to the obtained real set information symbol and virtual set information symbol. Illustratively, the present embodiment is implemented by symbolizing information c i，0 ，c i，1 ，...，c i，n-r-1 Coding by means of a Solomon (RS) code to obtain r check symbols c of a codeword i，n-r ，c i，n-r+1 ，...，c i，n-1 Thereby constructing and obtaining a multi-element Zipper code, and promoting the Zipper code from the binary code to the multi-element code。
In some embodiments of the present invention, the preset outer code decoding is performed on the inner code decoded data to obtain target transmission data, including but not limited to:
and carrying out codeword verification on the inner code decoding data through a Solomon code decoding algorithm to obtain a verification result.
And adding a check mark to each codeword in the inner code decoding data according to the check result. Wherein the check mark comprises a check pass and a check error.
And decoding the code words with the check marks of check errors in the internal code decoding data, and modifying the corresponding check marks into check passing.
And traversing each codeword, and when the codeword with the check mark as the check error exists, returning to the step of decoding the codeword with the check mark as the check error in the internal code decoding data, and modifying the corresponding check mark as the pass check.
In this embodiment, first, codeword verification is performed on the inner code decoded data by using a Solomon code decoding algorithm to obtain a verification result. Specifically, in this embodiment, first, whether a codeword received from an optical wireless communication channel has an error is checked by using an RS decoding algorithm, so as to obtain a check result. Next, the present embodiment adds a check flag to each codeword in the inner code decoded data according to the check result. Specifically, the check mark in this embodiment includes a pass check and a check error. The present embodiment defines an array, the size of which is the total number of codewords received, and sets the value of the element in the array to correspond to the index representing the i-th codeword. Then, it is checked whether the codeword received from the channel has an error by the RS decoding algorithm. If the received code word has errors, the array element corresponding to the code word is assigned as 'fresh', namely, the error is checked. Otherwise, the value is assigned as "rule", i.e. the verification passes. Then, the embodiment decodes the codeword with the check mark as the check error in the inner code decoded data, and modifies the corresponding check mark to pass the check. The present embodiment modifies the codeword labeled "fresh" from "fresh" to "state" by decoding and correcting the codeword, and correcting the array element corresponding to the codeword after correction, i.e., the check mark. Further, the embodiment traverses each codeword, and when there is a codeword with a check flag as a check error, returns to the step of decoding the codeword with the check flag as the check error in the internal code decoded data, and modifying the corresponding check flag to pass the check. The present embodiment decodes the codeword marked "fresh" by traversing the codewords, and returning to the step of decoding the codeword marked "fresh" when there are any codewords with "fresh", i.e., check errors, and the maximum number of allowed iterations has not been exceeded.
In some embodiments of the present invention, codewords marked as check errors in the inner code decoded data are decoded and the corresponding check marks are modified to pass the check, including but not limited to:
when the number of the error code words obtained through the verification of the Solomon code decoding algorithm is larger than the maximum error correction symbol number, the verification mark corresponding to the error code words is modified to pass the verification.
Or when the number of the error code words obtained by verification through the Solomon code decoding algorithm is smaller than or equal to the maximum error correction symbol number, error correction and verification are carried out through the Solomon code decoding algorithm, and the verification mark corresponding to the error code words is modified to pass verification.
In this embodiment, when the number of error codewords obtained by the verification of the Solomon code decoding algorithm is greater than the maximum number of error correction symbols, the embodiment modifies the verification flag corresponding to the error codeword to pass the verification. Specifically, if the number of errors is greater than the maximum number of error correction symbols t, the decoding capability is exceeded, and error correction is not possible. Meanwhile, when the number of error code words obtained through the verification of the Solomon code decoding algorithm is smaller than or equal to the maximum error correction symbol number, the embodiment performs error correction and verification through the Solomon code decoding algorithm, and corrects the verification mark corresponding to the error code words to pass the verification. Specifically, the present invention relates to a method for manufacturing a semiconductor device. When the number of errors is less than or equal to the maximum error correction symbol number t, correcting the error by an RS decoding algorithm and checking whether the codeword is corrected, and if so, changing the array element corresponding to the codeword from 'fresh' to 'state'. Meanwhile, the present embodiment also finds the position associated with the error correction symbol according to the interleaving map, performs error correction, and checks whether the codeword has been corrected. If corrected, the array element corresponding to the codeword is changed from 'fresh' to 'state'.
In some embodiments of the present invention, before performing the step of performing preset inner code encoding according to outer code encoded data to obtain inner code encoded data, the cascade encoding-based optical wireless communication method provided in this embodiment further includes, but is not limited to:
the outer code encoded data is interleaved by an interleaver.
In this embodiment, the outer code encoded data is interleaved before the preset inner code encoding is performed. Specifically, in order to enhance the error correction capability of the code pattern and reduce the redundancy of encoding, an interleaver is added between the inner code encoder and the outer code encoder in the encoding process, and the outer code encoded data is interleaved through the interleaver. The present embodiment adds an interleaver to interleave different data and then changes the interleaved data into a new data stream to an outer code decoder, and homogenizes the generated errors, so that the probability of uncorrectable burst errors is reduced to a certain extent, and the present embodiment has a great effect in optical wireless communication, and can gradually reduce the error rate with the increase of iteration times by using iterative decoding, and can improve the coding gain.
In some embodiments of the present invention, the preset inner code encoding is performed according to the outer code encoding data, so as to obtain inner code encoding data, including but not limited to:
and storing each codeword of the outer code encoded data into a corresponding line data in a buffer area, and constructing to obtain a buffer matrix.
And performing BCH code encoding on each column of the buffer matrix to obtain inner code encoded data.
In this embodiment, the buffer matrix is obtained by first buffering the corresponding data in each codeword buffer of the outer code encoded data. Then, in this embodiment, each column of the buffer matrix is subjected to BCH code encoding, thereby completing concatenated code encoding to obtain an inner codeEncoding the data. The outer code in this embodiment is illustratively a multiple user (n 2 ，k 2 ) The inner code is BCH (n) 1 ，k 1 ) Code, and k 1 λm, where λ is a positive integer, m=q. From k 2 A byte of m bits (k 2 m bits) is first encoded into a multiple-bit Zipper code containing n 2 A codeword of bytes. Next, the present embodiment temporarily stores the codeword in a buffer as a row of the array. Further, after constructing λ outer code words, the buffer stores one λ×n 2 I.e. a cache matrix. Wherein each column of the cache matrix is composed of λ m-bit bytes (λm-bits). Further, the present embodiment takes this λm bit as k of the BCH code 1 Bit information symbols, i.e. k 1 =λm, and pass through this k 1 Bit information symbol, coding to obtain n 1 The code words of the bits are encoded to obtain the inner code encoded data. The present embodiment sequentially transmits each column after encoding. Thus, the outer code is interleaved at a depth λ. Accordingly, when an inner code codeword is received that may contain errors, the present embodiment decodes it and removes the check bits. In this embodiment decoded lambda bytes (lambdam bits) are stored in the receiver buffer as lambda x n 2 One column of the array. Next, at n 2 After secondary inner code decoding, the receiver contains a lambda x n 2 Is a decoded array of (a). Further, the present embodiment decodes the concatenated code by decoding each row of the array according to the outer code.
In some embodiments of the present invention, before performing the step of inputting the inner code encoded data into the optical wireless communication channel for transmission, the cascade encoding-based optical wireless communication method provided in this embodiment further includes, but is not limited to:
and carrying out spatial modulation according to the inner code coding data to obtain spatial modulation data.
In this embodiment, the spatial modulation is performed on the inner code encoded data before the inner code encoded data is transmitted over the optical wireless communication channel. Specifically, the spatial modulation technique (SM) is a technique combining MIMO and digital modulationAnd (5) performing surgery. In an Optical Wireless Communication (OWC) system, in order to provide sufficient illumination, an illumination device is generally equipped with a plurality of LEDs, and the optical wireless communication system transmits data by modulating the intensity of an optical signal. Meanwhile, at the receiving end, the present embodiment converts the optical signals into electrical signals through the photodetector, and these electrical signals are used for decoding information. Correspondingly, according to the characteristics of multiple transmitters and multiple receivers, the embodiment modulates the inner code coded data through a spatial modulation technology after the inner code coded data is obtained through coding, and spatial modulation data is obtained. Accordingly, in this embodiment, after receiving the received data, the receiving data is first spatially demodulated, that is, before the received data is decoded by the preset inner code, the receiving data is spatially demodulated. Specifically, the present embodiment uses Maximum Likelihood (ML) detection at the receiving end, and calculates the euclidean distance between the received signal and the possible signal subjected to channel modulation, thereby obtaining the signal with the minimum euclidean distance
As an estimated transmission signal, the following formula (1) shows:
wherein p is y Is a probability density function with s and H as conditions, I.I F Indicating the Frobenius norm.
An embodiment of the present invention further provides an optical wireless communication system based on concatenated coding, including:
and the outer coding module is used for carrying out preset outer code coding on the data to be transmitted to obtain outer code coded data. Wherein the preset outer code comprises a multi-element Zipper code.
And the inner coding module is used for carrying out preset inner code coding according to the outer code coding data to obtain inner code coding data. Wherein the preset inner code comprises BCH code.
And the channel module is used for inputting the inner code coding data into the optical wireless communication channel for transmission. And acquiring corresponding received data at a receiving end of the optical wireless communication channel.
And the inner decoding module is used for carrying out preset inner code decoding on the received data when the received data are received, so as to obtain inner code decoded data. Wherein the preset inner code decoding corresponds to the preset inner code encoding.
And the outer decoding module is used for carrying out preset outer code decoding on the inner code decoding data to obtain target transmission data. Wherein the preset outer code decoding corresponds to the preset outer code encoding.
Referring to fig. 2, an embodiment of the present invention further provides an optical wireless communication system based on concatenated coding, including:
at least one processor 210.
At least one memory 220 for storing at least one program.
The at least one program, when executed by the at least one processor 210, causes the at least one processor 210 to implement the cascade coding based optical wireless communication method as described in the above embodiments.
An embodiment of the present invention also provides a computer-readable storage medium storing computer-executable instructions for execution by one or more control processors, e.g., to perform the steps described in the above embodiments.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present invention, and these equivalent modifications and substitutions are intended to be included in the scope of the present invention as defined in the appended claims.
Claims (10)
1. An optical wireless communication method based on cascade coding is characterized by comprising the following steps:
carrying out preset outer code coding on data to be transmitted to obtain outer code coded data; wherein the preset outer code comprises a multi-element Zipper code;
performing preset internal code coding according to the external code coding data to obtain internal code coding data; wherein the preset inner code comprises BCH code;
inputting the inner code coded data into an optical wireless communication channel for transmission; the receiving end of the optical wireless communication channel acquires corresponding received data;
when the received data is received, performing preset internal code decoding on the received data to obtain internal code decoded data; wherein the preset inner code decoding corresponds to the preset inner code encoding;
performing preset outer code decoding on the inner code decoding data to obtain target transmission data; wherein the preset outer code decoding corresponds to the preset outer code encoding.
2. The cascade coding-based optical wireless communication method according to claim 1, wherein the performing the preset outer code coding on the data to be transmitted to obtain outer code coded data comprises:
filling the data to be transmitted into the corresponding position of the real set to obtain a real set information symbol;
copying symbols from the real set information symbols corresponding to the preset code words according to the staggered mapping relation, and filling the copied symbols into corresponding positions in the virtual set to obtain virtual set information symbols;
and coding through a Solomon code according to the real set information symbol and the virtual set information symbol to obtain the outer code coding data.
3. The cascade coding-based optical wireless communication method according to claim 2, wherein the performing the preset outer code decoding on the inner code decoded data to obtain target transmission data comprises:
performing codeword verification on the inner code decoding data through a Solomon code decoding algorithm to obtain a verification result;
adding a check mark to each codeword in the inner code decoding data according to the check result; wherein the check mark comprises a check passing and check error;
decoding the code word with the check mark as check error in the internal code decoding data, and modifying the corresponding check mark into check passing;
and traversing each codeword, and returning to the step of decoding the codeword with the check mark as the check error in the internal code decoding data and modifying the corresponding check mark as the pass check when the codeword with the check mark as the check error exists.
4. The cascade coding-based optical wireless communication method of claim 3, wherein decoding the codeword with the check flag as a check error in the inner code decoded data and modifying the corresponding check flag as a check pass comprises:
when the number of error code words obtained through the verification of the Solomon code decoding algorithm is larger than the maximum error correction symbol number, modifying the verification mark corresponding to the error code words into verification passing;
or when the number of the error code words obtained through verification by the Solomon code decoding algorithm is smaller than or equal to the maximum error correction symbol number, performing error correction and verification by the Solomon code decoding algorithm, and modifying the verification mark corresponding to the error code words into verification passing.
5. The cascade-code-based optical wireless communication method according to claim 1, wherein before the step of performing the preset inner code encoding based on the outer code encoded data to obtain inner code encoded data, the method further comprises:
the outer code encoded data is interleaved by an interleaver.
6. The cascade-code-based optical wireless communication method according to claim 1, wherein before performing the step of inputting the inner-code-coded data into an optical wireless communication channel for transmission, the method further comprises:
and carrying out spatial modulation according to the inner code coding data to obtain spatial modulation data.
7. The cascade coding-based optical wireless communication method according to claim 5, wherein the performing preset inner code coding according to the outer code coding data to obtain inner code coding data comprises:
storing each codeword of the outer code encoded data into a corresponding data in a buffer area, and constructing to obtain a buffer matrix;
and carrying out BCH code encoding on each column of the buffer matrix to obtain the inner code encoded data.
8. An optical wireless communication system based on concatenated coding, comprising:
the external coding module is used for carrying out preset external code coding on the data to be transmitted to obtain external code coded data; wherein the preset outer code comprises a multi-element Zipper code;
the inner coding module is used for carrying out preset inner code coding according to the outer code coding data to obtain inner code coding data; wherein the preset inner code comprises BCH code;
the channel module is used for inputting the inner code coded data into an optical wireless communication channel for transmission; the receiving end of the optical wireless communication channel acquires corresponding received data;
the internal decoding module is used for carrying out preset internal code decoding on the received data when the received data are received, so as to obtain internal code decoded data; wherein the preset inner code decoding corresponds to the preset inner code encoding;
the outer decoding module is used for carrying out preset outer code decoding on the inner code decoding data to obtain target transmission data; wherein the preset outer code decoding corresponds to the preset outer code encoding.
9. An optical wireless communication system based on concatenated coding, comprising:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is caused to implement the cascade coding-based optical wireless communication method as claimed in any one of claims 1 to 7.
10. A computer storage medium in which a processor-executable program is stored, characterized in that the processor-executable program is for implementing the cascade coding-based optical wireless communication method according to any one of claims 1 to 7 when being executed by the processor.
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