WO2019154065A1 - Procédé et dispositif de communication pour une communication optique sans fil - Google Patents

Procédé et dispositif de communication pour une communication optique sans fil Download PDF

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Publication number
WO2019154065A1
WO2019154065A1 PCT/CN2019/072650 CN2019072650W WO2019154065A1 WO 2019154065 A1 WO2019154065 A1 WO 2019154065A1 CN 2019072650 W CN2019072650 W CN 2019072650W WO 2019154065 A1 WO2019154065 A1 WO 2019154065A1
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Prior art keywords
source symbol
information
source
symbol
index information
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PCT/CN2019/072650
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English (en)
Chinese (zh)
Inventor
黄伟
方平
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华为技术有限公司
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Priority claimed from CN201810714877.5A external-priority patent/CN110138451B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19750347.7A priority Critical patent/EP3737005B1/fr
Priority to JP2020542844A priority patent/JP7204762B2/ja
Priority to KR1020207023336A priority patent/KR102314275B1/ko
Priority to US16/968,366 priority patent/US11165504B2/en
Publication of WO2019154065A1 publication Critical patent/WO2019154065A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication

Definitions

  • the present application relates to the field of mobile communications technologies, and in particular, to a method and a communication device for wireless optical communication.
  • LiFi Light fidelity
  • VLC visible light communication
  • the channel coding is used as the VLC physical layer at a fixed rate.
  • a concatenated code composed of a Reed-Solomon (RS) code or an RS code and a convolutional code is used as a channel coding of the VLC physical layer, and is released.
  • RS Reed-Solomon
  • LDPC high performance low density parity check code
  • the code rate is set according to the preset channel model and the channel state information (CSI) of the feedback channel, and the rate adaptation cannot be implemented according to the dynamic channel of the VLC physical layer.
  • the code rate setting of the channel coding is low, resulting in check bit redundancy and reduced transmission efficiency; and when the actual channel condition is inferior to the preset channel model
  • the code rate of the channel coding is set too high, and sufficient check bits cannot be provided, resulting in deterioration of channel performance.
  • Embodiments of the present application provide a method and a communication device for wireless optical communication to improve data transmission efficiency in wireless optical communication.
  • the wireless optical communication may be infrared light communication, visible light communication, free space optical communication, or ultraviolet light communication.
  • the solution provided by the present application can be applied to any one of the foregoing wireless optical communications. Some embodiments provided by the present application are described by taking wireless optical communication as visible light communication as an example. The technical solution is as follows:
  • a method for wireless optical communication is provided, the method being applied to a first device, the method comprising:
  • Receiving a data frame sent by the second device and acquiring, according to the data frame, an encoding symbol, a length of the source symbol, a number of the source symbols, degree information of the source symbol, and index information of the source symbol, where
  • the degree information of the source symbol indicates the number of source symbols included in each source symbol group participating in the encoding process
  • the index information of the source symbol indicates an index of source symbols included in each source symbol group participating in the encoding process
  • the code symbol and a preset code rate decoding algorithm determine the source symbol.
  • the first device receives the data frame sent by the second device. Then, the first device acquires the coded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol according to the data frame. Thereafter, the first device determines a mapping relationship between the source symbol and the encoded symbol according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol. Finally, the first device determines the source symbol according to the mapping relationship, the encoding symbol, and the preset codeless decoding algorithm.
  • the second device generates the encoded information according to the adaptive code rate, and sends the encoded information to the first device through the data frame.
  • the first device may generate corresponding source symbols according to the foregoing coding information, so as to implement code rate adaptation according to the dynamic channel of the VLC physical layer.
  • the data frame carries the degree information of the source symbol and the index information of the source symbol, and according to the data frame, the degree information and the location of the source symbol are obtained.
  • the index information of the source symbol including:
  • the data frame carries a first random seed of the degree information of the source symbol and a first random seed of the index information of the source symbol, according to the data frame, Obtaining the degree information of the source symbol and the index information of the source symbol, including:
  • the first random seed of the degree information of the source symbol and the first random seed of the index information of the source symbol are generated by corresponding to the degree information of the source symbol and the index information of the source symbol, and the data frame is reduced.
  • the amount of data carried increases the transmission rate of data frames.
  • the data frame carries a second random seed of the degree information of the source symbol and a second random seed of the index information of the source symbol, according to the data frame, Obtaining the degree information of the source symbol and the index information of the source symbol, including:
  • the third random seed of the index information of the source symbol and the second random seed of the index information of the source symbol further reduce the amount of data carried in the data frame, thereby improving the transmission of the data frame. rate.
  • the data frame carries an identifier information identifier of the source symbol, and according to the data frame, acquiring degree information of the source symbol and index information of the source symbol, include:
  • the correspondence between the degree information of the source symbol and the index information of the source symbol is stored in advance, and the data frame carries only the encoded information, so that the data amount of the data frame is smaller.
  • the transfer rate is faster.
  • the data frame further carries the first check information, where the method further includes:
  • Second verification information according to the degree information of the source symbol, the index information of the source symbol, and a preset verification algorithm; if the second verification information is the same as the first verification information, And performing the step of determining a mapping relationship between the source symbol and the encoded symbol according to the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol.
  • the data frame further carries data mode information, where the method further includes:
  • a method for wireless optical communication is provided, the method being applied to a second device, the method comprising:
  • the second device acquires the source symbol, the length of the source symbol, and the number of source symbols. Then, the second device generates the encoded symbol, the degree information of the source symbol, and the index information of the source symbol according to the source symbol and the preset codeless encoding algorithm. Finally, the second device generates a data frame according to the coding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol, and transmits the data frame to the first device. In this way, the second device generates the encoded information according to the adaptive code rate, and sends the encoded information to the first device through the data frame.
  • the first device may generate corresponding source symbols according to the foregoing coding information, so as to implement code rate adaptation according to the dynamic channel of the VLC physical layer.
  • the first random seed of the degree information of the source symbol and the first random seed of the index information of the source symbol are generated by corresponding to the degree information of the source symbol and the index information of the source symbol, and the data frame is reduced.
  • the amount of data carried increases the transmission rate of data frames.
  • the third random seed of the index information of the source symbol and the second random seed of the index information of the source symbol further reduce the amount of data carried in the data frame, thereby improving the transmission of the data frame. rate.
  • the correspondence between the degree information of the source symbol and the index information of the source symbol is stored in advance, and the data frame carries only the encoded information, so that the data amount of the data frame is smaller.
  • the transfer rate is faster.
  • the method further includes:
  • Generating a data frame according to the coded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol including:
  • the method further includes:
  • Generating a data frame according to the coded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol including:
  • the information encapsulation manner corresponding to the data mode information according to the coding symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, the index information of the source symbol, and the Data mode information, generating data frames.
  • a communication device for wireless optical communication comprising:
  • a receiving module configured to receive a data frame sent by the second device
  • an acquiring module configured to acquire, according to the data frame, a coded symbol, a length of the source symbol, a number of the source symbol, a degree information of the source symbol, and a location
  • the index information of the source symbol wherein the degree information of the source symbol indicates the number of source symbols included in each source symbol group participating in the encoding process, and the index information of the source symbol indicates each source symbol group participating in the encoding process
  • An index of the included source symbol where the first determining module is configured to determine the source symbol according to the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and index information of the source symbol And a mapping relationship between the coded symbol and the second determining module, configured to determine the source symbol according to the mapping relationship, the coded symbol, and a preset codeless rate decoding algorithm.
  • the data frame carries the degree information of the source symbol and the index information of the source symbol
  • the acquiring module is specifically configured to:
  • the data frame carries a first random seed of the degree information of the source symbol and a first random seed of the index information of the source symbol
  • the acquiring module is specifically configured to: :
  • the data frame carries a second random seed of the degree information of the source symbol and a second random seed of the index information of the source symbol, where the acquiring module is specifically configured to: :
  • the data frame carries the coded information identifier of the source symbol
  • the acquiring module is specifically configured to:
  • the data frame further carries the first check information
  • the communications device further includes:
  • a generating module configured to generate second verification information according to the degree information of the source symbol, the index information of the source symbol, and a preset verification algorithm
  • a third determining module configured to: if the second verification The information is the same as the first check information, and triggers the first determining module to perform, according to the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol. And determining a mapping relationship between the source symbol and the encoded symbol.
  • the data frame further carries data mode information
  • the communications device further includes:
  • a fourth determining module configured to determine, according to a correspondence between the pre-stored data mode information and the information acquiring manner, an information acquiring manner corresponding to the data mode information in the data frame; the acquiring module is specifically configured to: The information acquiring manner corresponding to the data mode information in the data frame, and acquiring the degree information of the source symbol and the index information of the source symbol according to the data frame.
  • a communication device for wireless optical communication comprising:
  • An obtaining module configured to acquire a source symbol, a length of the source symbol, and a number of the source symbols
  • a first generating module configured to generate, according to the source symbol and a preset codeless coding algorithm, an encoding symbol, degree information of the source symbol, and index information of the source symbol, where the degree of the source symbol
  • the information indicates the number of source symbols included in each source symbol group participating in the encoding process, and the index information of the source symbol indicates an index of source symbols included in each source symbol group participating in the encoding process;
  • a sending module configured to generate a data frame according to the coded symbol, a length of the source symbol, a number of the source symbol, degree information of the source symbol, and index information of the source symbol, and send the data frame to the first device Send the data frame.
  • the sending module is specifically configured to:
  • the sending module is specifically configured to:
  • the sending module is specifically configured to:
  • the sending module is specifically configured to:
  • the communications apparatus further includes:
  • a second generation module configured to generate first verification information according to the degree information of the source symbol, the index information of the source symbol, and a preset verification algorithm
  • the sending module is specifically configured to:
  • the communications apparatus further includes:
  • a determining module configured to determine, according to the pre-stored data mode information and the information encapsulation manner, an information encapsulation manner corresponding to the data mode information in the data frame;
  • the sending module is specifically configured to:
  • the information encapsulation manner corresponding to the data mode information according to the coding symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, the index information of the source symbol, and the Data mode information, generating data frames.
  • a first device comprising: one or more processors, one or more memories, one or more baseband processing modules, one or more light source detectors, one or Multiple optical antennas;
  • memory is used to store program instructions
  • the processor configured to control the baseband processing module, the light source detector, and the optical antenna to perform the method according to the first aspect according to program instructions stored in the memory;
  • the optical antenna is configured to receive a light intensity signal, and send the light intensity signal to the photodetector;
  • the photodetector is configured to receive a light intensity signal, convert the light intensity signal into a biased electrical signal, and send the biased electrical signal to the baseband processing module, wherein the biased electrical signal can be Is a biased current signal or a biased voltage signal;
  • the baseband processing module is configured to receive an electrical signal with a bias, and perform demodulation processing and decoding processing on the biased electrical signal to generate a source symbol.
  • a second device comprising: one or more processors, one or more memories, one or more baseband processing modules, one or more light source drivers, one or more Light source
  • memory is used to store program instructions
  • the processor configured to control the baseband processing module, the light source driver, and the light source according to the program instructions stored in the memory to perform the method of the second aspect;
  • the baseband processing module is configured to perform coding processing and modulation processing on the source symbol, generate a data frame, and send the data frame to the light source driver;
  • the light source driver is configured to generate a direct current or a direct current voltage, and superimpose the received data frame with a direct current or a direct current voltage to generate an electrical signal with a bias, and send the biased electrical signal to the Light source
  • the light source is configured to generate a light intensity signal according to an electrical signal with a bias.
  • a computer readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of the first aspect.
  • a computer readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of the second aspect.
  • the first device receives the data frame sent by the second device. Then, the first device acquires the coded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol according to the data frame. Thereafter, the first device determines a mapping relationship between the source symbol and the encoded symbol according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol. Finally, the first device determines the source symbol according to the mapping relationship, the encoding symbol, and the preset codeless decoding algorithm.
  • the second device generates the encoded information according to the adaptive code rate, and sends the encoded information to the first device through the data frame.
  • the first device may generate corresponding source symbols according to the foregoing coding information, so as to implement code rate adaptation according to the dynamic channel of the VLC physical layer.
  • FIG. 1 is a schematic diagram of a network system according to an embodiment of the present application.
  • FIG. 2 is a flowchart of a method for a method for wireless optical communication according to an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a data frame according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a data frame according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a data frame according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a data frame according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a data frame according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a communication apparatus for wireless optical communication according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a communication apparatus for wireless optical communication according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a communication apparatus for wireless optical communication according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a communication apparatus for wireless optical communication according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of a communication apparatus for wireless optical communication according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of a communication apparatus for wireless optical communication according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of a device according to an embodiment of the present application.
  • adaptive coding is a communication technology that can adaptively adjust the code rate according to the channel environment, so that communication performance can be guaranteed with redundancy at a small cost. Therefore, adaptive coding becomes a key technology that balances communication performance and transmission efficiency in a dynamic channel environment.
  • a concatenated code composed of an RS code or an RS code and a convolutional code is determined as a channel coding, and in the IEEE.
  • a high performance low density parity check code (LDPC) is proposed as one of the physical layer channel coding.
  • LDPC high performance low density parity check code
  • the wireless optical channel is fragile and is easily blocked by obstacles, and the received signal strength is large in the dynamic range in the moving scene; (2) the wireless optical channel is subjected to the radiation mode of the light source end (such as the surface of the light emitting chip, the reflective cup, and the package lens). Etc.) and photodetector response function (field of view, carrier diffusion, quantum efficiency, etc.) have a greater impact; (3) the channel environment is complex, channel reciprocity is poor.
  • the conventional fixed rate coding such as code length and code rate, needs to be preset according to a preset channel model and channel state information (CSI) obtained according to the feedback channel.
  • the too low code rate results in a decrease in transmission efficiency due to redundant check bits; and when the channel condition is inferior to the assumption, the too high code rate cannot provide more parity bits because This leads to performance degradation, making it difficult to implement rate adaptation in a dynamic VLC channel.
  • Some researchers have proposed a scheme of codeless codec transmission, and study the coding structure, coding type, degree distribution and low complexity of the wireless optical channel. Decoding algorithms, etc., are expected to be able to achieve efficient transmission of approximate channel capacity in wireless optical communication by the feature of code rate-free code rate adaptation.
  • Rateless coding or fountain code coding is a coding scheme that can implement code rate adaptation according to the channel environment.
  • the simple principle is to divide the original data into a certain number of data packets at the coding end. These packets are encoded, and each packet packet after encoding has global partial information. As long as the decoding end correctly receives a sufficient number of encoded data packets in the packet data stream, all original data packets can be recovered with a certain probability, without considering which specific encoded data packets in the encoded data packet stream are received and The corresponding receiving order can realize the codeless rate decoding. And the system only needs a simple feedback or no feedback to achieve rate adaptation, so the channel capacity utilization is high, and it can adapt to various types of wireless transmission channels.
  • the decoding complexity of the codeless rate code is linear complexity, which is good for heterogeneous users, and supports interrupted transmission, and the decoding end does not need to consider the order of receiving symbols.
  • the traditional codeless rate code is a binary erasure channel (BEC) based on the transmission control protocol (TCP)/internet protocol (IP) Internet and is oriented to data packets.
  • the application layer forward error correction (AL-FEC) is designed. This type of erasure channel is characterized in that a packet is either received correctly or discarded due to errors, congestion, incorrect routing, and the like.
  • the traditional typical application of codeless rate coding is applied as application layer coding in multimedia broadcast multicast service (MBMS) and digital video broadcasting (DVB), and as FEC coding specification.
  • the code was adopted by the 3rd generation partnership project (3GPP) MBMS and DVB-T.
  • 3GPP 3rd generation partnership project
  • the traditional wireless channels are generally fading channels and noisy channels, and are inevitably subject to noise interference during transmission.
  • the encoding node directly receives the input soft information that is interfered and transmits it to the check node, thereby resulting in the correctness of the node likelihood information at the beginning of decoding.
  • the hard decision decoding algorithm based on the traditional codeless decoding will introduce many errors, resulting in performance degradation.
  • the codeless rate code in order to generalize the codeless rate code to a more generalized wireless channel such as a wireless relay channel, an additive white Gaussian noise channel, and a fading channel (including a Rayleigh channel and a Rice channel), it is necessary to adopt a soft decision belief propagation (such as soft decision). Algorithms such as belief propagation, BP) algorithm to achieve reliability decoding.
  • BP belief propagation
  • the code length of the codeless code encoding is generally longer, thus introducing the decoding delay and the storage space overhead.
  • the researchers redesigned the codeless structure, coding type and degree distribution to design a short code codeless rate code suitable for delay sensitive scenes and fading channels.
  • Strider code and Spinal code are two high-performance codeless code codes suitable for Gaussian channel.
  • the embodiment of the present application provides a method for wireless optical communication, which can be applied to a scenario of an indoor high-speed VLC network and an outdoor VLC network based on LiFi technology.
  • the indoor high-speed VLC network can be composed of indoor lighting and smart mobile terminals (such as mobile phones, wearable devices, etc.).
  • the outdoor VLC network may be composed of a vehicle-mounted intelligent terminal and an infrastructure (such as a street light, a traffic light, a billboard, etc.), or may be composed of a vehicle-mounted intelligent terminal and a vehicle-mounted intelligent terminal.
  • FIG. 1 is a schematic diagram of a network system provided by an embodiment of the present application. A second device and a first device are included in the network system.
  • the second device is a network device or a terminal device that can generate and transmit an optical signal, and specifically may be a device capable of generating an optical signal, such as an indoor lighting, a street light, a traffic light, a vehicle light, a base station, and the like.
  • the second device is also capable of receiving an optical signal.
  • the first device is a network device or a terminal device capable of receiving an optical signal, such as an intelligent mobile terminal, an in-vehicle intelligent terminal, and other intelligent terminals. Further optionally, the first device can also generate and transmit an optical signal. Data can be transmitted between the second device and the first device through visible light to implement data communication.
  • the second device performs encoding processing on the source symbols that need to be transmitted to obtain coded symbols and encoding parameters.
  • the second device then encapsulates the encoded symbols and encoding parameters into data frames and sends them to the first device.
  • the first device receives the data frame, and decodes the encoded symbol according to the encoding parameter, thereby obtaining the source symbol.
  • the embodiment of the present application provides a method for wireless optical communication, which can implement code rate adaptation according to a dynamic channel of a VLC physical layer, as shown in FIG. 2, and the specific processing flow is as follows:
  • Step 201 The second device acquires a source symbol, a length of the source symbol, and a number of source symbols.
  • the second device when the second device needs to communicate with the first device, the second device may acquire the source symbol to be encoded, the length of the source symbol, and the number of source symbols.
  • Step 202 The second device generates, according to the source symbol and the preset codeless coding algorithm, the coding symbol, the degree information of the source symbol, and the index information of the source symbol.
  • the degree information of the source symbol indicates the number of source symbols included in each source symbol group participating in the encoding process, and the index information of the source symbol indicates an index of the source symbol included in each source symbol group participating in the encoding process.
  • a codeless coding algorithm may be pre-stored in the second device.
  • the algorithm may be a codeless rate encoding algorithm for a system code (such as a RaptorQ code) or a codeless rate encoding algorithm for a non-system code, which is not limited in this application.
  • the second device may perform encoding processing on the source symbol according to the codeless coding algorithm to obtain a coded symbol, and generate coded information.
  • the coding information may include degree information of the source symbol and index information of the source symbol.
  • the source symbols may be grouped into a plurality of source symbol groups, and the source symbols in the respective source symbol groups are subjected to encoding processing (such as bitwise exclusive OR processing) to obtain encoded symbols.
  • the degree information of the source symbol indicates the number of source symbols included in each source symbol group participating in the encoding process, and the index information of the source symbol indicates an index of the source symbol included in each source symbol group participating in the encoding process.
  • the second device performs encoding processing on 10 source symbols, and the index of the source symbols is 1 to 10.
  • the second device groups the source symbols into four source symbol groups: (1, 3, 5), (2, 4, 6), (1, 3, 8, 9) and (2, 4, 5, 6, 10) .
  • the degree information of the source symbol is 3, 3, 4, and 5, and the index information of the source symbol is 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, 10 .
  • Step 203 The second device generates a data frame according to the coded symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol, and sends the data frame to the first device.
  • the second device may obtain the coded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol.
  • the data frame is encapsulated into a physical layer, and then the data frame of the physical layer is sent to the first device through a dynamic channel of the VLC physical layer established between the first device.
  • the structure of the data frame may include: a physical layer preamble, a physical layer header, and a physical layer data load.
  • the physical layer synchronization preamble is used for synchronizing data frames between the second device and the first device, and the physical layer synchronization preamble is a time domain sequence, and channel coding and line coding are not required.
  • the physical layer header may include the following fields: data mode, channel number, modulation and run length limited coding scheme index (MCS-ID), source symbol length and number (source symbol) Length and number, SSLN), dimming pattern, compensation symbol, reserved fields, and header check sequence (HCS).
  • MCS-ID modulation and run length limited coding scheme index
  • HCS header check sequence
  • the data mode is used to carry the data mode information of the data frame
  • the channel number is used to carry the band information of the visible light of the data frame
  • the MCS-ID is used to carry the modulation mode information, the line coding mode information, and the optical clock of the data frame.
  • the optical clock rate information is different from the code type and the code rate information that the MCS-ID is used to carry the channel coding in the IEEE 802.15.7 standard protocol.
  • the MCS-ID in the embodiment of the present application is used to carry the line coding mode information.
  • the SSLN is configured to carry the length information of the source symbol and the number of source symbols in the data frame; the dimming mode is used to carry the dimming mode information and the dimming percentage information supported by the data frame; and the compensation symbol is used to carry the dimming ratio.
  • Information; the reserved area is used for extension of the subsequent function of the data frame; the HCS is used to carry the check code of the physical layer header.
  • the physical layer data load may include the following fields: degree and source symbol index (DSSI), channel estimation sequence (CES), several coded symbols, and pad bits.
  • DSSI degree and source symbol index
  • CES channel estimation sequence
  • pad bits The DSSI is used to carry the degree information of the source symbol of the data frame and the index information of the source symbol
  • the CES is used to carry the channel estimation and channel equalization information of the data frame
  • the code symbol is used to encode the source symbol carrying the data frame.
  • the encoded symbol obtained after processing; the padding bits are used to prevent the data in the physical layer data payload from being mistaken for the boundary of the data frame.
  • the second device may generate a data frame of the physical layer by any one of the following methods:
  • the SSLN is set in the physical layer header
  • the DSSI is set in the physical layer data payload.
  • the DSSI is set in the physical layer header
  • the SSLN is set in the physical layer data payload.
  • both DSSI and SSLN are set in the physical layer header.
  • DSSI and SSLN are set in the physical layer data payload.
  • the embodiment of the present application introduces the SSLN in the physical layer header, and the DSSI is set in the physical layer data load as an example. Other situations are similar, and the description is not repeated herein.
  • the location of each field in the physical layer header and the location of each field in the physical layer data load may be adjusted and set by the designer according to actual needs. This application is not limited.
  • the manner in which the second device generates the data frame according to the coded symbol, the length of the source symbol, the number of the source symbol, the degree information of the source symbol, and the index information of the source symbol may be various, and the embodiment of the present application provides several A feasible processing method is introduced in combination with the specific structure of the data frame of the physical layer.
  • the second device encapsulates the coded symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol to obtain a data frame.
  • the second device may encapsulate the encoding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol. In the data frame, and sent to the first device.
  • the second device In a second manner, as shown in FIG. 4, the second device generates a first random seed of the degree information of the source symbol according to the degree information of the source symbol, the index information of the source symbol, and the preset first pseudo random number generation algorithm. a first random seed of index information of the source symbol; performing a encapsulation process on the first random seed of the first random seed and the index information of the source symbol of the encoded symbol, the length of the source symbol, the number of source symbols, and the degree information of the source symbol, Get the data frame.
  • the first pseudo random number generation algorithm may be pre-stored in the second device.
  • the second device may respectively generate the first random seed of the degree information of the source symbol and the first random number of the index information of the source symbol according to the first pseudo random number generation algorithm. seed.
  • the second device may encapsulate the first random seed of the coding symbol, the length of the source symbol, the number of source symbols, the first random seed of the source symbol, and the first random seed of the index information of the source symbol in the data frame, and send the data to the data frame.
  • the first random seed of the index information of the source symbol may be a sequence of random seeds, the number of random seeds is the same as the number of source symbol groups, and each random seed is generated by index information of source symbols in the corresponding source symbol group.
  • the degree information of the source symbol is 3, 3, 4, and 5, and the index information of the source symbol is 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, 10,
  • the second device may generate 2 (ie, the first random seed of the degree information of the source symbol) according to the 3, 3, 4, 5 and the first pseudo random number generation algorithm.
  • the second device can generate 2, 7 according to 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, 10 and the first pseudo random number generation algorithm. , 9, 11 (the first random seed of the index information of the source symbol).
  • the first random seed of the degree information of the source symbol and the first random seed of the index information of the source symbol are generated by corresponding to the degree information of the source symbol and the index information of the source symbol, and the data frame is reduced.
  • the amount of data carried increases the transmission rate of data frames.
  • the second device In a third mode, as shown in FIG. 5, the second device generates a third random seed of the index information of the source symbol according to the index information of the source symbol, the degree information of the source symbol, and the preset third pseudo random number generation algorithm. Generating a second random seed of the degree information of the source symbol and a second random number of the index information of the source symbol according to the degree information of the source symbol, the third random seed of the index information of the source symbol, and the preset second pseudo random number generating algorithm a seed; performing a encapsulation process on the second random seed of the encoding information, the length of the source symbol, the number of source symbols, the second random seed of the source symbol, and the index information of the source symbol to obtain a data frame.
  • the second device may pre-store the number of source symbol groups corresponding to the second pseudo-random number generation algorithm, the third pseudo-random algorithm, and the degree information of the source symbol, where the second pseudo-random number generation algorithm,
  • the third pseudo-random algorithm and the first pseudo-random number generating algorithm in the second mode may be the same or different, and are not limited in the embodiment of the present application.
  • the second device may generate a second random seed of the degree information of the source symbol according to the degree information of the source symbol and the second pseudo random number generation algorithm. Then, the second device generates a third random seed of the index information of the source symbol according to the index information of the source symbol, the number of source symbol groups corresponding to the degree information of the source symbol, and the third pseudo random number generation algorithm. Then, the second device may generate a second random seed of the index information of the source symbol according to the third random seed of the index information of the source symbol, the degree information of the source symbol, and the second pseudo random number generation algorithm.
  • the second device may encapsulate the second random seed of the coding symbol, the length of the source symbol, the number of source symbols, the second random seed of the degree information of the source symbol, and the second random seed of the index information of the source symbol in the data frame, and send the data to the data frame.
  • the second random seed of the index information of the source symbol is a random seed of the third random seed of the index information of the source symbol.
  • the degree information of the source symbol is 3, 3, 4, and 5, and the index information of the source symbol is 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, 10, the number of source symbol groups corresponding to the degree information of the source symbol is 4, and the second device may generate 2 according to the 3, 3, 4, 5, and the second pseudo random number generation algorithms (ie, the degree information of the source symbol) Two random seeds).
  • the second device can generate the algorithm according to 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, 10, and 4 and the third pseudo random number generation algorithm.
  • the third random seed of the index information of the source symbol and the second random seed of the index information of the source symbol further reduce the amount of data carried in the data frame, thereby improving the transmission of the data frame. rate.
  • the second device determines, according to the pre-stored coding information, the correspondence between the degree information of the source symbol and the index information of the source symbol, and determines the degree information and the source symbol of the corresponding source symbol.
  • Encoding information identifier of the source symbol of the index information encapsulating the encoded symbol, the length of the source symbol, the number of source symbols, and the encoding information identifier of the source symbol to obtain a data frame.
  • the correspondence between the coding information identifier and the degree information of the source symbol and the index information of the source symbol may be pre-stored in the second device.
  • the second device may query the degree information and the source of the corresponding source symbol in the correspondence between the coding information identifier and the degree information of the source symbol and the index information of the source symbol.
  • the encoded information identifier of the index information of the symbol may be encapsulate the coded symbol, the length of the source symbol, the number of source symbols, and the coded information identifier of the source symbol in the data frame, and send the data to the first device.
  • the correspondence between the coding information identifier and the degree information of the source symbol and the index information of the source symbol is 4B, and the degree information of the source symbol is 3, 3, 4, 5, and the source.
  • the index information of the symbols is 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, and 10.
  • the correspondence between the degree information of the source symbol and the index information of the source symbol is stored in advance, and the data frame carries only the encoded information, so that the data amount of the data frame is smaller.
  • the transfer rate is faster.
  • Step 204 The first device receives the data frame sent by the second device.
  • the first device may receive, by using a dynamic channel of the VLC physical layer established between the second device, the second device to send a data frame of the physical layer.
  • Step 205 The first device acquires, according to the data frame, an encoding symbol, a length of the source symbol, a number of source symbols, degree information of the source symbol, and index information of the source symbol.
  • the degree information of the source symbol indicates the number of source symbols included in each source symbol group participating in the encoding process, and the index information of the source symbol indicates an index of the source symbol included in each source symbol group participating in the encoding process.
  • the first device may obtain the coded symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol according to the data frame.
  • the manner in which the first device obtains the degree information of the source symbol and the index information of the source symbol according to the data frame may be various.
  • the embodiment of the present application provides several feasible processing manners, and combines the data frames of the physical layer. The specific structure is introduced.
  • the data frame carries the degree information of the active symbol and the index information of the source symbol
  • the first device can acquire the source carried in the data frame.
  • the degree information of the symbol and the index information of the source symbol can be acquired.
  • the first device may parse the data frame to obtain degree information of the source symbol and index information of the source symbol carried in the data frame.
  • the second mode is directed to the second mode in step 203: as shown in FIG. 4, the first random seed carrying the degree information of the active symbol and the first random seed of the index information of the source symbol in the data frame,
  • a device may generate degree information of the source symbol and index information of the source symbol according to the first random seed of the degree information of the source symbol and the first random seed of the index information of the source symbol.
  • the first device may pre-store the first pseudo-random number generation algorithm and the number of source symbol groups corresponding to the degree information of the source symbol.
  • the first device may parse the data frame to obtain a first random seed of the degree information of the source symbol carried in the data frame, and a first random seed of the index information of the source symbol.
  • the first device may generate the degree information of the source symbol according to the first random seed of the degree information of the source symbol, the number of source symbol groups corresponding to the degree information of the source symbol, and the first pseudo random number generation algorithm.
  • the index information of the source symbol is generated according to the degree information of the source symbol, the first random seed of the index information of the source symbol, and the first pseudo random number generation algorithm.
  • the second device may generate the algorithm according to the 4, 2 and the first pseudo random number generation algorithm. , 3, 4, 5.
  • the second device can generate 1, 3, 5, 2, 4, 6, according to (3, 3, 4, 5), (2, 7, 9, 11) and the first pseudo random number generation algorithm, respectively. 1, 3, 8, 9, 2, 4, 5, 6, 10.
  • the first random seed of the degree information of the source symbol and the first random seed of the index information of the source symbol are generated by corresponding to the degree information of the source symbol and the index information of the source symbol, and the data frame is reduced.
  • the amount of data carried increases the transmission rate of data frames.
  • the third mode is directed to the third mode in step 203: as shown in FIG. 5, the second random seed carrying the degree information of the active symbol and the second random seed of the index information of the source symbol in the data frame, first
  • the specific processing procedure of the device for obtaining the degree information of the source symbol and the index information of the source symbol according to the data frame is: a second random seed of the first device according to the degree information of the source symbol, a second random seed of the index information of the source symbol, and a pre- a second pseudo-random number generation algorithm, which generates a third random seed of the source symbol and a degree information of the source symbol; a third random seed according to the index information of the source symbol, a degree information of the source symbol, and a preset number
  • the three pseudo random number generation algorithm generates index information of the source symbol.
  • the number of source symbol groups corresponding to the second pseudo random number generation algorithm, the third pseudo random number generation algorithm, and the degree information of the source symbol may be pre-stored in the first device.
  • the first device may parse the data frame to obtain a second random seed of the degree information of the source symbol carried in the data frame and a second random seed of the index information of the source symbol. Then, the first device may generate an algorithm according to the second random seed of the degree information of the source symbol, the second random seed of the index information of the source symbol, the number of source symbol groups corresponding to the degree information of the source symbol, and the second pseudo random number generation algorithm, A third random seed of the degree information of the source symbol and the index information of the source symbol is generated.
  • the first device generates index information of the source symbol according to the degree information of the source symbol, the third random seed of the index information of the source symbol, and the third pseudo random number generation algorithm.
  • the number of source symbol groups corresponding to the degree information of the source symbol is 4, the second random seed of the degree information of the source symbol is 2, and the second random seed of the index information of the source symbol is 5, and the second device can be based on 4 , 2, 5, and a second pseudo-random number generation algorithm, generating (3, 3, 4, 5) and (2, 7, 9, 11), and then, the second device can be based on (3, 3, 4, 5, respectively) , (2, 7, 9, 11) and the third pseudo-random number generation algorithm, generating 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, 10 .
  • the third random seed of the index information of the source symbol and the second random seed of the index information of the source symbol further reduce the amount of data carried in the data frame, thereby improving the transmission of the data frame. rate.
  • the fourth mode is directed to the fourth mode in step 203: as shown in FIG. 6, the data frame carries the coding information identifier of the active symbol, and the first device acquires the degree information of the source symbol and the source symbol according to the data frame.
  • the specific processing procedure of the index information is: the first device determines the degree information of the source symbol corresponding to the coding information identifier of the source symbol according to the correspondence between the degree information of the source symbol and the index information of the source symbol according to the pre-stored coding information identifier. And index information of the source symbol.
  • the correspondence between the coding information identifier and the degree information of the source symbol and the index information of the source symbol may be pre-stored in the first device.
  • the correspondence is the same as the corresponding relationship pre-stored by the second device.
  • the first device may parse the data frame to obtain an identifier of the coded information carried in the data frame.
  • the first device may query whether there is an entry corresponding to the coded information identifier in the correspondence between the coded information identifier and the degree information of the source symbol and the index information of the source symbol, and if yes, obtain the degree of the corresponding source symbol. Index information for information and source symbols.
  • the coding information identifier is 4B in the correspondence between the coding information identifier and the source information and the source symbol index information, and the source symbol degree information is 3, 3, 4, 5, and the source.
  • the index information of the symbols is 1, 3, 5, 2, 4, 6, 1, 3, 8, 9, 2, 4, 5, 6, and 10.
  • the correspondence between the degree information of the source symbol and the index information of the source symbol is stored in advance, and the data frame carries only the encoded information, so that the data amount of the data frame is smaller.
  • the transfer rate is faster.
  • Step 206 The first device determines, according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol, a mapping relationship between the source symbol and the encoded symbol.
  • the first device may further generate a mapping relationship between the source symbol and the encoded symbol.
  • the mapping relationship between the source symbol and the encoding symbol may be represented by an encoding matrix or a generating matrix or a Tanner graph, and may also be represented by other methods, which is not limited in this application.
  • Step 207 The first device determines the source symbol according to the mapping relationship, the coded symbol, and the preset codeless rate decoding algorithm.
  • the first device has a code-free decoding algorithm pre-stored, and the code-free decoding algorithm may select a soft-decision-confidence propagation algorithm, or may select another code-free decoding algorithm that carries soft information.
  • the code-free decoding algorithm may select a soft-decision-confidence propagation algorithm, or may select another code-free decoding algorithm that carries soft information. This application is not limited.
  • the first device may further decode the coded symbol according to the mapping relationship, the coded symbol, and the codeless rate decoding algorithm, thereby obtaining the source symbol.
  • the second device may perform verification and protection on the degree information of the source symbol and the index information of the source symbol according to the preset verification algorithm, as shown in FIG. 7.
  • the specific processing procedure is: the second device is based on the source symbol.
  • the degree information, the index information of the source symbol, and the preset verification algorithm generate the first verification information.
  • the specific processing of step 203 is: the second device generates a data frame according to the coded symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, the index information of the source symbol, and the first check information.
  • a verification algorithm may be pre-stored in the second device. After generating the degree information of the source symbol and the index information of the source symbol, the second device may generate the first verification information according to the verification algorithm, the degree information of the source symbol, and the index information of the source symbol. Then, the second device may encapsulate the coding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, the index information of the source symbol, and the first check information in the data frame, and send the data to the first device.
  • the step of performing protection check on the degree information of the source symbol and the index information of the source symbol according to the preset verification algorithm by the second device, as shown in FIG. 7, the first frame is also carried in the data frame.
  • the first device may perform verification on the degree information of the source symbol and the index information of the source symbol according to the first verification information.
  • the specific processing procedure is: the first device according to the degree information of the source symbol and the index information of the source symbol.
  • the index information determines the mapping relationship between the source symbol and the encoded symbol.
  • a verification algorithm may be pre-stored in the first device.
  • the verification algorithm is the same as the verification algorithm pre-stored by the second device.
  • the first device may parse the data frame to obtain degree information of the source symbol carried in the data frame, index information of the source symbol, and first check information. Then, the first device generates second check information according to the degree information of the source symbol, the index information of the source symbol, and the check algorithm, and determines whether the second check information is the same as the first check information. If the second check information is the same as the first check information, it indicates that the degree information of the source symbol and the index information of the source symbol do not change during the transmission, and the first device may be based on the length of the source symbol and the source symbol.
  • the number of the source symbols, the degree information of the source symbols, and the index information of the source symbols determine the mapping relationship between the source symbols and the encoded symbols. If the second check information is different from the first check information, it indicates that the degree information of the source symbol and the index information of the source symbol change during the transmission, and the first device may request the second device to perform retransmission.
  • the second device may also generate the first check information according to different information.
  • the second device may Generating, according to the first random seed of the first random seed and the index information of the source symbol of the check information, the first random seed of the source symbol, the first check information; and the third device in step 203, the second device may further a second random seed of the verification algorithm, the second random seed of the degree information of the source symbol, and the index information of the source symbol, to generate the first verification information; and for the fourth mode in step 203, the second device may also be based on the calibration The algorithm and the encoded information identifier are generated to generate the first verification information.
  • the first device may also generate a second check according to the first random seed of the check algorithm, the first random seed of the degree information of the source symbol, and the index information of the source symbol.
  • the first device may further generate the second check information according to the second random seed of the check algorithm, the second random seed of the degree information of the source symbol, and the index information of the source symbol.
  • the first device may further generate second check information according to the check algorithm and the coded information identifier, and determine whether the second check information is the same as the first check information.
  • the specific processing procedure is similar to the processing described above, and will not be described again in this application.
  • the second device may select different information encapsulation manners to generate data frames according to different data mode information.
  • the specific processing process is: the second device determines the data frame according to the pre-stored data mode information and the information encapsulation manner.
  • the specific processing procedure of step 203 is: the second device is based on the information encapsulation manner corresponding to the data mode information, according to the coding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol.
  • Data mode information generating data frames.
  • the IEEE divides the data mode of the data frame of the VLC physical layer into a single mode, a packed mode, and a burst mode according to the VLC service type in the released 802.15.7 standard protocol. ) and on-off Keying dimmed mode.
  • single mode mode is used for short data or small file data transmission (such as response signal, connection signal, beacon signal or information broadcast, etc.)
  • each data frame includes one physical layer data unit (physical layer) Data unit, PPDU).
  • Packet mode and burst mode are used for high-speed transmission of long data or large file data.
  • the key-switching dimming mode is used to support the dimming requirement. As shown in FIG. 3, the dimming mode field and the compensation symbol field can be implemented in the data frame.
  • the second device may directly encapsulate the degree information of the source symbol and the index information of the source symbol into the data frame, and send the data frame to the first device.
  • the second device may select the degree information of the corresponding source symbol and the source symbol when transmitting the data frame.
  • the encoded information identifier of the index information is encapsulated in the data frame and sent to the first device.
  • the correspondence between the data mode information and the information encapsulation mode may be pre-stored in the second device.
  • the second device may be configured according to the correspondence between the pre-stored data mode information and the information encapsulation mode. Determine the corresponding information encapsulation method. For example, when the data mode information of the data frame is the packet mode and the burst mode, the degree information of the source symbol and the index information of the source symbol or the index information of the first random seed and the source symbol of the degree information of the source symbol are A second random seed of the random seed or the symbol information of the source symbol and a second random seed of the index information of the source symbol are encapsulated in the data frame, and the data frame is transmitted to the first device.
  • the coded information identifier is encapsulated in the data frame, and the data frame is sent to the first device.
  • the second device may be configured to generate a data frame according to different data mode information according to different data mode information, where the data frame may also carry data mode information, and the first device may be configured according to different data modes.
  • Information selecting different information acquisition methods to obtain the degree information of the source symbol and the index information of the source symbol.
  • the specific processing procedure is: determining the data pattern in the data frame according to the correspondence between the pre-stored data pattern information and the information acquisition manner. The information acquisition manner corresponding to the information; based on the information acquisition manner corresponding to the data pattern information in the data frame, the degree information of the source symbol and the index information of the source symbol are obtained according to the data frame.
  • the correspondence between the data mode information and the information acquisition manner may be pre-stored in the first device.
  • the correspondence between the data mode information and the information acquiring manner is the same as the corresponding relationship between the data mode information and the information encapsulation manner pre-stored by the second device.
  • the first device may receive the data frame, the data frame may be parsed to obtain data mode information. Then, the first device may determine a corresponding information acquisition manner according to the pre-stored data mode information and the information acquisition manner correspondence relationship. For example, when the data mode of the data frame is the packet mode and the burst mode, the first random seed and the source symbol of the degree information of the source symbol carried in the data frame and the index information of the source symbol or the degree information of the source symbol are acquired.
  • the second random seed of the index information or the second random seed of the degree information of the source symbol and the second random seed of the index information of the source symbol is obtained.
  • the first device receives the data frame sent by the second device. Then, the first device acquires the coded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol according to the data frame. Thereafter, the first device determines a mapping relationship between the source symbol and the encoded symbol according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol. Finally, the first device determines the source symbol according to the mapping relationship, the encoding symbol, and the preset codeless decoding algorithm.
  • the second device generates the encoded information according to the adaptive code rate, and sends the encoded information to the first device through the data frame.
  • the first device may generate corresponding source symbols according to the foregoing coding information, so as to implement code rate adaptation according to the dynamic channel of the VLC physical layer.
  • the embodiment of the present application further provides a communication device for wireless optical communication, where the communication device is applied to a first device, as shown in FIG. 8, the communication device includes:
  • the receiving module 810 is configured to receive a data frame sent by the second device.
  • the obtaining module 820 is configured to obtain, according to the data frame, an encoding symbol, a length of the source symbol, a number of source symbols, degree information of the source symbol, and index information of the source symbol, where the degree information of the source symbol indicates each source participating in the encoding process.
  • the number of source symbols included in the symbol group, and the index information of the source symbol indicates an index of source symbols included in each source symbol group participating in the encoding process;
  • the first determining module 830 is configured to determine, according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol, a mapping relationship between the source symbol and the encoded symbol;
  • the second determining module 840 is configured to determine the source symbol according to the mapping relationship, the encoding symbol, and the preset codeless decoding algorithm.
  • the data frame carries the degree information of the active symbol and the index information of the source symbol
  • the obtaining module 820 is specifically configured to:
  • the first random seed that carries the first random seed of the degree information of the active symbol and the index information of the source symbol in the data frame is specifically configured to:
  • the second random seed of the information information of the source symbol and the second random seed of the index information of the source symbol are carried in the data frame, and the acquiring module 820 is specifically configured to:
  • the index information of the source symbol is generated according to the third random seed of the index information of the source symbol, the degree information of the source symbol, and the preset third pseudo random number generation algorithm.
  • the data frame carries an encoded information identifier of the active symbol
  • the obtaining module 820 is specifically configured to:
  • the data frame also carries the first check information.
  • the communications device further includes:
  • the generating module 850 is configured to generate second verification information according to the degree information of the source symbol, the index information of the source symbol, and a preset verification algorithm.
  • the third determining module 860 is configured to: if the second check information is the same as the first check information, trigger the first determining module 830 to perform according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the source symbol. Index information, the step of determining the mapping relationship between the source symbol and the encoded symbol.
  • the data frame also carries data mode information.
  • the communications apparatus further includes:
  • the fourth determining module 870 is configured to determine, according to the correspondence between the pre-stored data mode information and the information acquiring manner, an information acquiring manner corresponding to the data mode information in the data frame;
  • the obtaining module 820 is specifically configured to:
  • the degree information of the source symbol and the index information of the source symbol are obtained according to the data frame based on the information acquiring manner corresponding to the data mode information in the data frame.
  • the first device receives the data frame sent by the second device by using the receiving module 810. Then, the first device acquires, by the acquiring module 820, the encoded symbol, the length of the source symbol, the number of the source symbols, the degree information of the source symbol, and the index information of the source symbol according to the data frame. Then, the first device determines, by the first determining module 830, a mapping relationship between the source symbol and the encoded symbol according to the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol. Finally, the first device determines the source symbol by the second determining module 840 according to the mapping relationship, the encoding symbol, and the preset codeless decoding algorithm.
  • the second device generates the encoded information according to the adaptive code rate, and sends the encoded information to the first device through the data frame.
  • the first device may generate corresponding source symbols according to the foregoing coding information, so as to implement code rate adaptation according to the dynamic channel of the VLC physical layer.
  • the embodiment of the present application further provides a communication device for wireless optical communication, and the communication device is applied to a second device.
  • the communication device includes:
  • An obtaining module 1110 configured to acquire a source symbol, a length of the source symbol, and a number of source symbols
  • the first generating module 1120 is configured to generate, according to the source symbol and the preset codeless encoding algorithm, the encoded information, the degree information of the source symbol, and the index information of the source symbol, where the degree information of the source symbol indicates each of the participating encoding processes.
  • the number of source symbols included in the source symbol group, and the index information of the source symbol indicates an index of source symbols included in each source symbol group participating in the encoding process;
  • the sending module 1130 is configured to generate a data frame according to the coded symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol, and send the data frame to the first device.
  • the sending module 1130 is specifically configured to:
  • the coding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol are encapsulated to obtain a data frame.
  • the sending module 1130 is specifically configured to:
  • the first random seed of the first random seed and the index information of the source symbol of the coding symbol, the length of the source symbol, the number of source symbols, and the degree information of the source symbol are encapsulated to obtain a data frame.
  • the sending module 1130 is specifically configured to:
  • the second random seed of the encoding information, the length of the source symbol, the number of source symbols, the second random seed of the source symbol, and the index information of the source symbol are encapsulated to obtain a data frame.
  • the sending module 1130 is specifically configured to:
  • the communications apparatus further includes:
  • the second generation module 1140 is configured to generate first verification information according to the degree information of the source symbol, the index information of the source symbol, and a preset verification algorithm.
  • the sending module 1130 is specifically configured to:
  • a data frame is generated according to the coding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, the index information of the source symbol, and the first parity information.
  • the communication device further includes:
  • a determining module 1150 configured to determine, according to the pre-stored data mode information and the information encapsulation manner, an information encapsulation manner corresponding to the data mode information in the data frame;
  • the sending module 1130 is specifically configured to:
  • the data frame is generated based on the information encapsulation method corresponding to the data mode information, according to the coding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, the index information of the source symbol, and the data pattern information.
  • the second device acquires the source symbol, the length of the source symbol, and the number of the source symbols through the obtaining module 1110. Then, the second device generates, by the first generation module 1120, the coding symbol, the degree information of the source symbol, and the index information of the source symbol according to the source symbol and the preset codeless coding algorithm. Finally, the second device generates a data frame by the sending module 1130 according to the encoding symbol, the length of the source symbol, the number of source symbols, the degree information of the source symbol, and the index information of the source symbol, and sends the data frame to the first device.
  • the second device generates the encoded information according to the adaptive code rate, and sends the encoded information to the first device through the data frame.
  • the first device may generate corresponding source symbols according to the foregoing coding information, so as to implement code rate adaptation according to the dynamic channel of the VLC physical layer.
  • the embodiment of the present application further provides a first device, which may be a terminal device or a network device.
  • the first device includes one or more processors 1410, one or more memories 1420, one or more baseband processing modules 1430, one or more photodetectors 1460, one or more optics Antenna 1470.
  • the memory 1420 is configured to store program instructions.
  • the processor 1410 is configured to control the baseband processing module 1430, the light source detector 1460, and the optical antenna 1470 to perform the method for wireless optical communication performed by the first device according to the program instructions stored in the memory 1420.
  • the optical antenna 1470 is configured to receive a light intensity signal and transmit the light intensity signal to the photodetector 1460.
  • the photodetector 1460 is configured to receive the light intensity signal, convert the light intensity signal into a biased electrical signal, and send the biased electrical signal to the baseband processing module 1430, wherein the biased electrical signal can be a band Offset current signal or biased voltage signal.
  • the baseband processing module 1430 is configured to receive the biased electrical signal, and perform demodulation processing and decoding processing on the biased electrical signal to generate a source symbol.
  • the first device may further include one or more radio frequency transceivers 1490 for receiving or transmitting radio frequency signals.
  • the processor 1410, the memory 1420, the baseband processing module 1430, the electrical detector 1460, and the radio frequency transceiver 1490 are connected by a bus.
  • the baseband processing module 1430 may perform channel estimation, add a channel estimation sequence to the data frame, add a synchronization preamble to the data frame, or add a dimming mode or the like to the data frame.
  • the first device may further include a communication interface 1480.
  • the communication interface 1480 is configured to receive a data packet sent by another network device, parse the data packet, obtain a source symbol in the data packet, and send the source symbol to the baseband processing module 1430.
  • the first device may further include one or more light source drivers 1440 and one or more light sources 1450.
  • the role of the light source driver 1440 and the light source 1450 can be referred to the related description in the second device described below.
  • the embodiment of the present application further provides a second device, which may be a terminal device or a network device.
  • the second device includes one or more processors 1410, one or more memories 1420, one or more baseband processing modules 1430, one or more light source drivers 1440, one or more light sources 1450. .
  • the memory 1420 is configured to store program instructions.
  • the processor 1410 is configured to control the baseband processing module 1430, the light source driver 1440, and the light source 1450 to perform the method for wireless optical communication performed by the second device according to the program instructions stored in the memory 1402.
  • the baseband processing module 1430 is configured to perform encoding processing and modulation processing on the source symbols, generate a data frame, and send the data frame to the light source driver 1440.
  • the light source driver 1440 is configured to generate a direct current or a direct current voltage, and superimpose the received data frame with a direct current or a direct current voltage to generate an electrical signal with a bias, and send the biased electrical signal to the light source 1450. .
  • a light source 1450 is configured to generate a light intensity signal based on the biased electrical signal.
  • the second device may further include one or more radio frequency transceivers 1490 for receiving or transmitting radio frequency signals.
  • the processor 1410, the memory 1420, the baseband processing module 1430, the light source driver 1440, and the radio frequency transceiver 1490 are connected by a bus.
  • the baseband processing module 1430 may perform channel estimation, add a channel estimation sequence to the data frame, add a synchronization preamble to the data frame, or add a dimming mode or the like to the data frame.
  • the second device may further include a communication interface 1480.
  • the communication interface 1480 is configured to perform encapsulation processing on the source symbols, obtain data packets, and send the data packets to other network devices.
  • the second device may further include one or more photodetectors 1460, and one or more optical antennas 1470.
  • the role of photodetector 1460 and optical antenna 1470 can be referred to the related description in the first device described above.
  • the embodiment of the present application further provides a computer readable storage medium, including instructions for causing a computer to execute a method performed by the first device when the instruction is run on a computer.
  • the embodiment of the present application further provides a computer readable storage medium, including instructions for causing a computer to execute a method performed by the second device when the instruction is run on a computer.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les modes de réalisation de la présente invention concernent un procédé et un dispositif de communication pour une communication optique sans fil, concernant le domaine technique des communications mobiles. Le procédé consiste à : recevoir des trames de données envoyées par un second équipement ; acquérir des symboles codés, la longueur de symboles sources, le nombre de symboles sources, des informations de degré de symboles sources et des informations d'indice de symboles sources selon les trames de données, les informations de degré de symboles sources représentant le nombre de symboles sources contenus dans divers groupes de symboles sources qui participent à un processus de codage, et les informations d'indice de symboles sources représentant des indices de symboles sources contenus dans divers groupes de symboles sources qui participent au processus de codage ; déterminer une relation de mappage entre les symboles sources et les symboles codés en fonction de la longueur des symboles sources, du nombre de symboles sources, des informations de degré de symboles sources et des informations d'indice de symboles sources ; et déterminer les symboles sources en fonction de la relation de mappage, des symboles codés et d'un algorithme de décodage de débit sans code prédéfini. Une auto-adaptation de débit de code peut être réalisée selon un canal dynamique de couche physique VLC en utilisant la présente invention.
PCT/CN2019/072650 2018-02-08 2019-01-22 Procédé et dispositif de communication pour une communication optique sans fil WO2019154065A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19750347.7A EP3737005B1 (fr) 2018-02-08 2019-01-22 Procédé et dispositif de communication pour une communication optique sans fil
JP2020542844A JP7204762B2 (ja) 2018-02-08 2019-01-22 ワイヤレス光通信方法および通信装置
KR1020207023336A KR102314275B1 (ko) 2018-02-08 2019-01-22 무선 광 통신 방법 및 통신 장치
US16/968,366 US11165504B2 (en) 2018-02-08 2019-01-22 Wireless optical communication method and communications apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201810133531 2018-02-08
CN201810133531.6 2018-02-08
CN201810714877.5A CN110138451B (zh) 2018-02-08 2018-06-29 一种用于无线光通信的方法及通信装置
CN201810714877.5 2018-06-29

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