CN113014321B - Visible light relay access system and method based on MIMO power line return - Google Patents
Visible light relay access system and method based on MIMO power line return Download PDFInfo
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- 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
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
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- H04B—TRANSMISSION
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Abstract
The invention relates to the technical field of visible light communication, in particular to a visible light relay access system and a method based on MIMO power line return, wherein the visible light relay access system comprises a power line return subsystem, a relay subsystem and a visible light subsystem; the power line return subsystem comprises a PLC transmitting end, a PLC channel and a PLC receiving end; the relay subsystem receives the data stream output by the PLC receiving end and forwards the data stream to the visible light subsystem; the visible photon system comprises a visible light emitting means and a visible light receiving means. According to the invention, new wired power line resources are not required to be laid, the existing power line is utilized to transmit the far-end data stream to the application scene of visible light access, and visible light carrying the data stream is transmitted and received, so that visible light communication is completed, the transmission capacity of the power line is fully improved based on MIMO, multiplexing and demultiplexing technologies, and flexible mapping between multiple independent spatial data streams in the power line feedback system and multiple data streams in visible light wireless coverage is realized.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a visible light relay access system and a visible light relay access method based on MIMO power line return.
Background
Visible light communication can utilize existing LED lighting infrastructure to load information signals onto the bias current of the LED light sources, thereby providing wireless coverage for the user while simultaneously providing general lighting.
In most indoor scenes, complete Power Line infrastructure is already arranged, and cost challenge caused by arrangement of a special wired return cable can be naturally avoided by means of a wired return scheme based on a Power Line Communication (PLC) technology. On the other hand, the visible light communication transceiver based on the LED light source highly depends on power line power supply to realize a basic lighting function, and the LED light source and the existing power line infrastructure are in a dense inseparable highly-coupled interconnection assistance relationship.
The existing power line backhaul scheme oriented to visible light wireless access is limited to SISO power line Point-to-Point (P2P: point to Point) wired backhaul connection, that is, only a basic SISO link configuration is relied on at two ends of the power line to transmit a single data stream. The method simply equates the power line with a single transmission copper wire, and on one hand, the modeling complexity of the power line transmission part is simplified; on the other hand, a line arrangement method in which three lines, P line, N line, and PE line, are generally used in a commercial power grid (particularly, a power distribution network to a general customer premises) has been objectively ignored. Therefore, when the existing SISO link data stream is applied to a commercial three-wire system power distribution line, one path of data signal is loaded by naturally using only 2 of 3 independent ports of a P wire, an N wire and a PE wire, so that the spatial dimension resource of a power line cannot be fully used, and the transmission capacity of a power line return line in a visible light access system cannot be ensured.
Disclosure of Invention
The invention provides a visible light relay access system and a visible light relay access method based on MIMO power line return, overcomes the defects of the prior art, and can effectively solve the problem that the visible light wireless access system combined with a power line cannot fully use power line space dimension resources, so that the transmission capacity of the visible light wireless access system is not high.
One of the technical schemes of the invention is realized by the following measures: a visible light relay access system based on MIMO power line return comprises a power line return subsystem, a relay subsystem and a visible light subsystem;
the power line return subsystem comprises a PLC transmitting end, a PLC channel and a PLC receiving end, wherein the PLC transmitting end acquires data streams, one data stream is coded and modulated into two data streams based on MIMO and multiplexing technology and transmitted to the remote PLC receiving end after passing through the PLC channel, and the PLC receiving end decodes and demodulates four data streams output by the PLC channel based on MIMO and demultiplexing technology;
the relay subsystem receives the data stream output by the PLC receiving end and forwards the data stream to the visible light subsystem;
the visible light photon system comprises a visible light emitting device and a visible light receiving device, the visible light emitting device receives the data stream which is amplified and forwarded by the relay subsystem and emits a visible light signal carrying the modulated data stream, and the visible light receiving device receives the visible light signal carrying the modulated data stream and obtains a corresponding data stream.
The following is further optimization or/and improvement of the technical scheme of the invention:
the PLC transmitting end comprises an FEC encoding module, a QAM modulating module, an MIMO encoding module, two OFDM modulating modules and a filter; the FEC coding module is connected with the QAM modulation module, the QAM modulation module is connected with the MIMO coding module, the MIMO coding module is connected with the two OFDM modulation modules, and the two OFDM modulation modules are connected with the filter; the PLC receiving end comprises a filter, an MIMO decoding module, a QAM demodulating module, an FEC decoding module and four OFDM demodulating modules; the filter is respectively connected with four OFDM demodulators, the four OFDM demodulators are all connected with the MIMO decoder, and the MIMO decoder, the QAM demodulator and the FEC decoder are sequentially connected.
The relay subsystem comprises a band-pass filter and an amplifier, wherein the band-pass filter is connected with the amplifier.
The visible light emitting device comprises a serial/parallel module, a modulator, a direct current offset module, four OFDM modulators and four light source emitters, wherein the serial/parallel module is connected with the four OFDM modulation modules, the four OFDM modulation modules are all connected with the modulator, the modulator is connected with the direct current offset module, and the direct current offset module is respectively connected with the four light source emitters; the visible light receiving device comprises demodulators, a parallel/serial module, four transimpedance amplifiers, four OFDM demodulators and four photoelectric detectors, wherein the photoelectric detectors are connected with the transimpedance amplifiers in a one-to-one correspondence mode, each transimpedance amplifier is connected with one of the demodulators, the demodulators are respectively connected with the four OFDM demodulators, and the four OFDM demodulators are connected with the parallel/serial module.
The visible light emitting device comprises a serial/parallel module, four OFDM modulators, a direct current bias and a plurality of light source emitters, wherein the number of the direct current bias is the same as that of the light source emitters, the serial/parallel module corresponds to that of the light source emitters one by one, the four OFDM modulators are connected with the serial/parallel module, the four OFDM modulators are all connected with the modulators, the modulators are connected with the direct current bias, and the direct current bias is all connected with the light source emitters; the visible light receiving device comprises a photoelectric detector, a transimpedance amplifier, a demodulator and an OFDM demodulator, wherein the photoelectric detector, the transimpedance amplifier, the demodulator and the OFDM demodulator are sequentially connected.
The visible light emitting device comprises an encoder, a modulator, a direct current bias module and a light source emitter, wherein the encoder, the modulator, the direct current bias module and the light source emitter are sequentially connected; the visible light receiving device comprises a photoelectric detector, a transimpedance amplifier, a demodulator and a decoder which are sequentially connected.
The second technical scheme of the invention is realized by the following measures: a visible light relay access method based on MIMO power line return comprises the following steps:
the PLC transmitting terminal acquires a data stream, the data stream is coded and modulated based on MIMO and multiplexing technology, and the modulated two data streams output four data streams to the PLC receiving terminal through a PLC channel;
the PLC receiving end demodulates and decodes the four data streams into one data stream based on the MIMO and demultiplexing technology and sends the data stream to the relay subsystem;
the relay subsystem receives and forwards the data stream to the data stream visible light emitting device;
the visible light emitting device receives the data stream and emits a visible light signal carrying the modulated data stream, and the visible light receiving device receives the visible light signal carrying the modulated data stream and obtains a corresponding data stream.
The invention does not need to lay new wired power line resources, can utilize the existing power line to transmit the far-end data stream to the application scene of visible light access through the power line return subsystem, the relay subsystem and the visible photon system, and transmits and receives the visible light carrying the data stream, thereby completing the visible light communication, fully improving the transmission capacity of the power line based on MIMO, multiplexing and demultiplexing technologies, realizing the flexible mapping between the multi-path independent spatial data stream in the power line return system and the multi-path data stream in the visible light wireless coverage, realizing the transmission reliability enhancement and the throughput flexibility improvement which cannot be provided by the traditional SISO power line return scheme, and being suitable for diversified indoor scenes such as classrooms, meeting rooms, office halls, medical places, supermarkets and the like.
Drawings
Fig. 1 is a scene schematic diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a system according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a power line backhaul subsystem in embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a PLC channel in embodiment 1 of the present invention.
Fig. 5 is a schematic structural diagram of a PLC transmitting terminal in embodiment 2 of the present invention.
Fig. 6 is a schematic structural diagram of a PLC receiving end in embodiment 2 of the present invention.
Fig. 7 is a schematic structural diagram of a relay subsystem in embodiment 3 of the present invention.
Fig. 8 is a schematic structural diagram of a MIMO configured optical photonic system in embodiment 4 of the present invention.
FIG. 9 is a schematic structural view of an optical photonic system of a MISO configuration in example 5 of the present invention.
FIG. 10 is a schematic diagram of the structure of a SISO configured optical photonic system in embodiment 6 of the present invention.
In the drawing, 1 is a light source emitter, and 2 is a photodetector.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
example 1: as shown in fig. 1, 2, 3, and 4, the present embodiment discloses a visible light relay access system based on MIMO power line backhaul, which includes a power line backhaul subsystem, a relay subsystem, and a visible light subsystem;
the power line return subsystem comprises a PLC transmitting end, a PLC channel and a PLC receiving end, wherein the PLC transmitting end acquires data streams, one data stream is coded and modulated into two data streams based on MIMO and multiplexing technology and transmitted to the remote PLC receiving end after passing through the PLC channel, and the PLC receiving end decodes and demodulates four data streams output by the PLC channel based on MIMO and demultiplexing technology;
the relay subsystem receives the data stream output by the PLC receiving end and forwards the data stream to the visible light subsystem;
the visible light receiving device receives the visible light signal carrying the modulated data stream to obtain a corresponding data stream.
In the above technical solution, the power line backhaul subsystem, based on MIMO, multiplexing, and demultiplexing technologies, zooms out the remote data stream to a location near the physical location of the visible light access subsystem through the power line transmission medium, and accesses the relay subsystem located near the physical location of the visible light access subsystem. The PLC transmitting terminal acquires data streams, one data stream is coded and modulated into two data streams based on MIMO and multiplexing, the two data streams are transmitted through a power line, and a PLC receiving terminal and a relay subsystem which are located near the physical position of a far-end visible light access subsystem receive and forward from the power line, so that the far-end data streams are pulled far to the vicinity of the physical position of the visible light access subsystem through a wired power line transmission medium (the visible light access subsystem is usually arranged at an indoor scene).
It should be noted that in this embodiment, both the PLC transmitting end and the PLC receiving end refer to an MIMO (multiple input multiple output) technology and a multiplexing technology (the multiplexing technology may be orthogonal frequency division multiplexing), so that diversity gain and multi-channel data parallel transmission of wired signals are achieved, and the power line backhaul subsystem is not disturbed by inter-symbol interference.
As shown in figure 4, by introducing the MIMO technology, at most 12 candidate links (PLC channels, namely MIMO channels) can be obtained in the three-wire system power line, thereby effectively improving the reliability and peak transmission capacity of power line transmission, namely P-N signal ports and N-PE signals are included in the PLC channelsThe PLC channel comprises a P-N signal port, an N-PE signal port, a P-PE signal port and a CM signal port, 12 candidate links (PLC channels) are formed among three transmitting ports and four receiving ports, kirchhoff law is obeyed among the three transmitting ports, namely the sum of the feed signals of the three ports is 0, and therefore any two ports of the PLC transmitting ends acquire two paths of data streams. The transmission coefficient of the PLC channel between the PLC transmitting terminal and the PLC receiving terminal can be usedh i μv To obtain each sub-bandiOf a PLC channel, i.e. MIMO channel matrix H i (v= 1,2; μ= 1,…,4)。
By introducing multiplexing technology (the multiplexing technology can be orthogonal frequency division multiplexing), one high-speed data stream is converted into multiple parallel low-speed data streams, and the multiple parallel low-speed data streams are modulated to each sub-channel for transmission, so that mutual interference among the channels is reduced, and the signal bandwidth on each channel is smaller than the related bandwidth of the channel, so that the signal bandwidth on each sub-channel can be regarded as flat fading, and the inter-symbol interference is eliminated. By introducing a demultiplexing technology, a plurality of paths of low-speed data streams are combined into one path of high-speed data stream, and the transmission rate is guaranteed.
In the technical scheme, the relay subsystem improves the signal quality of the data stream received by the PLC receiving end, resists typical power line noise sources such as power line impact noise, narrow-band noise, colored noise and the like in the power line transmission process, and forwards the noise-reduced data stream to the visible light access subsystem after reducing the noise.
In the technical scheme, the visible light emitting device emits visible light carrying data stream, so that the radiation of the visible light to the indoor space is realized. The visible light receiving device captures visible light, obtains data streams and completes visible light communication.
The embodiment of the invention discloses a visible light relay access system based on MIMO power line return, which can transmit a far-end data stream to a visible light access application scene by using the existing power line through a power line return subsystem, a relay subsystem and a visible photon system without laying new wired power line resources, and transmit and receive visible light carrying the data stream so as to complete visible light communication.
Example 2: as shown in fig. 5 and 6, this embodiment discloses a visible light relay access system based on MIMO power line backhaul, where the PLC transmitting end includes an FEC encoding module, a QAM modulation module, an MIMO encoding module, two OFDM modulation modules, and a filter; the FEC coding module is connected with the QAM modulation module, the QAM modulation module is connected with the MIMO coding module, the MIMO coding module is connected with the two OFDM modulation modules, and the two OFDM modulation modules are connected with the filter.
The FEC coding module, the QAM modulation module, the MIMO coding module, the OFDM modulation module, and the filter are all known in the art, wherein the FEC coding module adds a redundant error correction code to a data stream to complete an error detection function, the QAM modulation module implements channel de-noising, and the OFDM modulation module performs orthogonal frequency division multiplexing modulation, that is, a high-speed data stream is distributed to a plurality of sub-channels with relatively low transmission rate for transmission through serial-parallel conversion.
The PLC receiving end comprises a filter, an MIMO decoding module, a QAM demodulating module, an FEC decoding module and four OFDM demodulating modules; the filter is respectively connected with four OFDM demodulators, the four OFDM demodulators are all connected with the MIMO decoder, and the MIMO decoder, the QAM demodulator and the FEC decoder are sequentially connected.
The filter, the MIMO decoding module, the QAM demodulation module, the FEC decoding module, and the OFDM demodulation module are all known in the art. The QAM demodulation module demodulates and recovers the QAM modulated data stream, and the FEC decoding module automatically corrects transmission error codes through decoding.
Example 3: as shown in fig. 7, this embodiment discloses a visible light relay access system based on MIMO power line backhaul, where the relay subsystem further includes a band-pass filter and an amplifier, and the band-pass filter is connected to the amplifier.
In the technical scheme, the relay subsystem realizes amplification forwarding; wherein the band pass filter filters noise present when transmitting the data stream in the channel; the amplifier amplifies the received data stream together with noise and sends the amplified data stream to the visible light subsystem.
Example 4: as shown in fig. 8, this embodiment discloses a visible light relay access system based on MIMO power line backhaul, where the visible light emitting device includes a serial/parallel module, a modulator, a dc offset module, four OFDM modulators, and four light source transmitters 1, the serial/parallel module is connected to the four OFDM modulation modules, the four OFDM modulation modules are all connected to the modulators, the modulators are connected to the dc offset module, and the dc offset module is connected to the four light source transmitters 1 respectively; the visible light receiving device comprises demodulators, a parallel/serial module, four transimpedance amplifiers, four OFDM demodulators and four photoelectric detectors 2, wherein the photoelectric detectors 2 are connected with the transimpedance amplifiers in a one-to-one correspondence mode, each transimpedance amplifier is connected with one of the demodulators, the demodulators are respectively connected with the four OFDM demodulators, and the four OFDM demodulators are connected with the parallel/serial module.
The embodiment realizes the visible photon system with the MIMO configuration, can support the parallel transmission of multiple independent visible light signal data streams, can improve the capacity and reliability of a visible light communication link by means of the MIMO configuration, and is suitable for application scenes of the multi-light source emitter 1 and the multi-photodetector 2.
In the above technical solution, in the visible light emitting device, the serial/parallel module divides the data stream in the relay subsystem into four data streams. The four OFDM modulation modules respectively modulate the four groups of data streams, and the modulator modulates the low-frequency digital signals into high-frequency digital signals for signal transmission. And the driving signal and the data stream are loaded to the light source emitter 1 through the direct current bias module, so as to drive the light source emitter 1 to be lightened. The light source transmitter 1 may include an LED signal transmitting end, a condensing lens and an optical filter, the LED signal transmitting end transmits multiple paths of uniform visible light signals, the condensing lens converges the visible light signals transmitted by the LED signal transmitting end, and the optical filter filters unnecessary visible light signals, so as to screen out the required visible light signals, so that the required visible light signals pass through due to high transmittance, and the visible light signals of other wavelengths are reflected and absorbed.
In the above technical solution, the photodetector 2 in the visible light receiving device detects the visible light signal and restores it to an electrical signal. The transimpedance amplifier is used as a preamplifier of the visible light receiving device, amplifies the received weak data stream, and filters noise of the amplifier so as to improve the signal-to-noise ratio of the output. The demodulator performs digital demodulation on the modulated data stream to recover the original data stream. The decoder recovers the data stream coded by the coder, the QAM demodulation module demodulates and recovers the data stream modulated by the QAM, and the parallel/serial module combines the multiple data streams into one data stream.
Example 5: as shown in fig. 9, this embodiment discloses a visible light relay access system based on MIMO power line backhaul, where the visible light emitting device includes a serial/parallel module, four OFDM modulators, a modulator, a dc offset, and a plurality of light source emitters 1, where the number of the dc offset and the number of the light source emitters 1 are the same and are in one-to-one correspondence, the serial/parallel module is connected to the four OFDM modulators, the four OFDM modulators are all connected to the modulator, the modulator is connected to the dc offset, and the dc offset is all connected to the plurality of light source emitters 1; the visible light receiving device comprises a photoelectric detector 2, a transimpedance amplifier, a demodulator and an OFDM demodulator, wherein the photoelectric detector 2, the transimpedance amplifier, the demodulator and the OFDM demodulator are sequentially connected.
In this embodiment, the visible light subsystem is limited by the number of the photodetectors 2, so that a visible light photonic system based on MISO configuration is realized, parallel transmission of one independent visible light signal data stream can be supported, and the method is suitable for application scenarios of the multiple light source emitter 1 and the single photodetector 2. The specific implementation function is the same as that in embodiment 4, and is not described again.
Example 6: as shown in fig. 10, this embodiment discloses a visible light relay access system based on MIMO power line backhaul, where the visible light emitting device includes an encoder, a modulator, a dc bias module, and a light source emitter 1, and the encoder, the modulator, the dc bias module, and the light source emitter 1 are connected in sequence; the visible light receiving device comprises a photoelectric detector 2, a transimpedance amplifier, a demodulator and a decoder, wherein the photoelectric detector 2, the transimpedance amplifier, the demodulator and the decoder are sequentially connected.
In this embodiment, the visible photon system is limited by the number of the light source emitter 1 and the number of the photo detector 2, so that the visible photon system based on SISO configuration is realized, parallel transmission of one path of independent visible light signal data stream can be supported, and the method is suitable for application scenarios of a single light source emitter 1 and a single photo detector 2. The specific implementation function is the same as that in embodiment 4, and is not described in detail.
Example 7: the embodiment discloses a visible light relay access method based on MIMO power line backhaul.A PLC transmitting terminal acquires data streams, performs coding modulation on the data streams based on MIMO and multiplexing technology, and outputs four data streams to a PLC receiving terminal through two modulated data streams via a PLC channel;
s101, a PLC receiving end demodulates and decodes four paths of data streams into one path of data stream based on MIMO and demultiplexing technology, and sends the data stream to a relay subsystem;
step S102, the relay subsystem receives and forwards the data stream to the visible light emitting device;
step S103, the visible light emitting device receives the data stream, and emits a visible light signal carrying the modulated data stream, and the visible light receiving device receives the visible light signal carrying the modulated data stream, so as to obtain a corresponding data stream.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (6)
1. A visible light relay access system based on MIMO power line return is characterized by comprising a power line return subsystem, a relay subsystem and a visible light subsystem;
the power line return subsystem comprises a PLC transmitting end, a PLC channel and a PLC receiving end, wherein the PLC transmitting end acquires data streams, one data stream is coded and modulated into two data streams based on MIMO and multiplexing technology and transmitted to the remote PLC receiving end after passing through the PLC channel, and the PLC receiving end decodes and demodulates four data streams output by the PLC channel based on MIMO and demultiplexing technology; the PLC transmitting end comprises an FEC encoding module, a QAM modulating module, an MIMO encoding module, two OFDM modulating modules and a filter, wherein the FEC encoding module is connected with the QAM modulating module; the PLC receiving end comprises a filter, an MIMO decoding module, a QAM demodulating module, an FEC decoding module and four OFDM demodulating modules; the filter is respectively connected with four OFDM demodulators, the four OFDM demodulators are all connected with an MIMO decoder, and the MIMO decoder, the QAM demodulator and the FEC decoder are sequentially connected;
the relay subsystem receives the data stream output by the PLC receiving end and forwards the data stream to the visible light subsystem;
the visible light receiving device receives the visible light signal carrying the modulated data stream to obtain a corresponding data stream.
2. The visible light relay access system based on MIMO power line backhaul of claim 1, wherein the relay subsystem comprises a band pass filter and an amplifier, the band pass filter is connected with the amplifier.
3. The visible light relay access system based on the MIMO power line backhaul of claim 1 or 2, wherein the visible light emitting device comprises a serial/parallel module, a modulator, a DC offset module, four OFDM modulators and four light source transmitters, the serial/parallel module is connected with the four OFDM modulation modules, the four OFDM modulation modules are all connected with the modulator, the modulator is connected with the DC offset module, and the DC offset module is respectively connected with the four light source transmitters;
the visible light receiving device comprises demodulators, a parallel/serial module, four transimpedance amplifiers, four OFDM demodulators and four photoelectric detectors, wherein the photoelectric detectors are connected with the transimpedance amplifiers in a one-to-one correspondence mode, each transimpedance amplifier is connected with one of the demodulators, the demodulators are respectively connected with the four OFDM demodulators, and the four OFDM demodulators are all connected with the parallel/serial module.
4. The MIMO power line backhaul-based visible light relay access system according to claim 1 or 2, wherein the visible light emitting device comprises a serial/parallel module, four OFDM modulators, a DC bias, a plurality of light source emitters, the number of the DC bias and the number of the light source emitters are the same and are in one-to-one correspondence, the serial/parallel module is connected with the four OFDM modulators, the four OFDM modulators are all connected with the modulators, the modulators are connected with the DC bias, and the DC bias is all connected with the plurality of light source emitters;
the visible light receiving device comprises a photoelectric detector, a transimpedance amplifier, a demodulator and an OFDM demodulator, wherein the photoelectric detector, the transimpedance amplifier, the demodulator and the OFDM demodulator are sequentially connected.
5. The MIMO power line backhaul-based visible light relay access system according to claim 1 or 2, wherein the visible light emitting device comprises an encoder, a modulator, a DC bias module and a light source emitter, and the encoder, the modulator, the DC bias module and the light source emitter are connected in sequence;
the visible light receiving device comprises a photoelectric detector, a transimpedance amplifier, a demodulator and a decoder, wherein the photoelectric detector, the transimpedance amplifier, the demodulator and the decoder are sequentially connected.
6. A visible light relay access method based on MIMO power line backhaul is characterized by comprising the following steps:
the PLC transmitting terminal acquires a data stream, the data stream is coded and modulated based on MIMO and multiplexing technology, and the modulated two data streams output four data streams to a PLC receiving terminal through a PLC channel, and the method specifically comprises the following steps: the FEC encoding module adds a redundant error correcting code into one path of data flow to complete an error detection function, the QAM modulating module realizes channel de-noising, the MIMO encoding module converts one path of data flow into two paths of parallel data flow by utilizing a multiplexing technology, and the OFDM modulating module carries out orthogonal frequency division multiplexing modulation on the two paths of parallel data flow;
the PLC receiving terminal demodulates and decodes one path of data stream of four paths of data streams based on MIMO and demultiplexing technology, and send to the relay subsystem, include specifically: the filter filters each path of data stream, the QAM demodulation module demodulates and recovers each path of QAM modulated data stream, the MIMO decoding module converts four paths of data streams into one path of data stream by utilizing a demultiplexing technology, and the data stream is FEC decoded by the FEC decoding module to automatically correct transmission error codes;
the relay subsystem receives and forwards the data stream to the data stream visible light emitting device;
the visible light emitting device receives the data stream and emits a visible light signal carrying the modulated data stream, and the visible light receiving device receives the visible light signal carrying the modulated data stream and obtains a corresponding data stream.
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