CN106385612A - Household multimedia gateway system based on DTV-VLC key technology - Google Patents
Household multimedia gateway system based on DTV-VLC key technology Download PDFInfo
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- CN106385612A CN106385612A CN201610821611.1A CN201610821611A CN106385612A CN 106385612 A CN106385612 A CN 106385612A CN 201610821611 A CN201610821611 A CN 201610821611A CN 106385612 A CN106385612 A CN 106385612A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention provides a household multimedia gateway system based on the DTV-VLC key technology, and the system comprises a terrestrial digital information standard receiver which is used for receiving a DTMB (Digital Terrestrial Multimedia Broadcasting) signal emitted by an outdoor radio broadcasting base station or a DVB-C (digital video broadcasting) signal connected through a wired cable. The terrestrial digital information standard receiver is integrated with a DTMB/DVB-C demodulation unit and a PLC adaptive unit, and is used for receiving an home-entry DVB-C signal, carrying out the demodulation and decoding of the home-entry DVB-C signal, restoring a digital television video code stream, and modulating the digital television video code stream into a TDS-OFDM signal. The terrestrial digital information standard receiver comprises a tuner, a local oscillator drive analog-digital converter, an automatic gain control unit for the statistics of energy of received signals, an interpolation filtering unit, a channel equalizer, and a Hibert filter. The system effectively reduces the actual engineering implementation software and hardware complexity of a DTV-VLC integration broadcast system, improves the transmission efficiency, reduces the processing time delay, simplifies the production process of multimedia gateway equipment, and reduces the production cost.
Description
[technical field]
The present invention relates to family multi-media gateway technique field, more particularly, to a kind of good stability, structure is simple, transmission effect
Rate is high, the family multi-media gateway system based on DTV-VLC key technology that can significantly reduce costs.
[background technology]
Product majority in the market is multiple modules, the integrated product of multiple system, and customer experience degree is poor, and
And system hardware complexity is high, product stability is poor, and digital TV network merges transmission key technology with visible light communication
Research and development also do not have like product to come out at present both at home and abroad.
Based on the problems referred to above, how to make full use of effective transmission bandwidth of power line and visible light communication, lifting frequency spectrum profit
With efficiency, effectively overcome the low signal-to-noise ratio being likely to occur in outdoor digital television transmission channel complicated and changeable, strong frequency selective fading
Deng bottleneck, realize the target of two-forty in power line and VLC transmission and high spectrum effect it is ensured that the transmission of HD video business,
Those skilled in the art has carried out substantial amounts of research and development and has tested.
[content of the invention]
For overcoming the problems of prior art, the present invention provides a kind of good stability, and structure is simple, efficiency of transmission
Height, the family multi-media gateway system based on DTV-VLC key technology that can significantly reduce costs.
The scheme that the present invention solves technical problem is to provide a kind of family multi-media gateway based on DTV-VLC key technology
System, including for receiving the ground digital television signal (DTMB) of outdoor wireless broadcast base station transmitting or being connect by wire cable
The ground digital information standard receiver of the cable TV signal (DVB-C) entering；Described ground digital information standard receiver collection
Become to have DTMB/DVB-C demodulating unit and PLC adaptation unit；
Described ground digital information standard receiver is registered one's residence DTMB signal described in receiving, by receiving, amplifying, and direct coupling
Conjunction is forwarded to PLC-VLC network and carries out in-door covering；
Described ground digital information standard receiver is registered one's residence DVB-C signal described in receiving, and to registering one's residence, DVB-C signal solves
Adjust, decode, restore digital TV video frequency code stream, then digital TV video frequency code stream is modulated to TDS-OFDM signal；
Described ground digital information standard receiver includes tuner, local oscillator drives analog-digital converter, be used for statistics receives
The automatic gain control unit of signal energy, filtering interpolation unit, channel equalizer and Hibert wave filter；The described external world is wired
TV RF signals (RF input signal) downconvert to little intermediate frequency through tuner (Tuner), drive analog-digital converter by local oscillator
(ADC) sampled, automatic growth control (AGC) unit is that foundation is carried out to the amplifier in Tuner automatically with this sampled value
Gain control, the data signal after ADC conversion carries out, after bandpass filtering and orthogonal transformation, being decomposed through Hibert wave filter
Become in-phase component (I road) and quadrature component (Q road) two-way；
Frame synchronization is carried out by computing cross-correlation, obtains the position of PN sequence, then by the analysis to PN sequence, enter one
Step carries out carrier synchronization, Timing Synchronization and channel estimation；Described time synchronization signals feed back to filtering interpolation unit, and signal is entered
Row correction of timing, and carry out further matched filtering obtain make each code element obtain optimum reception performance；The signal of carrier synchronization
Feed back to Digital Down Convert, for correcting frequency deviation；The signal of carrier correction and correction of timing is through cyclic convolution after treatment
Reconstructed module removes PN, and carries out channel equalization；The output of channel equalizer can directly carry out symbol de-maps and FEC solution
Code, and finally restore the TS code stream of digital television program.
Preferably, the RF signal receiving is amplified by described tuner, and completing channel selects, and by the signal selecting from RF frequency
Section transforms to the intermediate-frequency band of a fixation；The voltage of described control tuner AGC is provided by intermediate-frequency section；Channel selection is led to
Cross the divide ratio changing PLL realizing.
Preferably, the channel estimation unit of described ground digital information standard receiver is divided into each OFDM block to provide channel
The estimation of response, to correct the data sampling that each receives；After completing Frequency Estimation, signal has also remained a fixation
Phase error, also contains this error in channel estimation, DTMB channel estimation base and PN sequence complete.
Preferably, described channel equalization part realizes channel equalization in frequency domain by FFT computing, and is soft-decision channel solution
Code device (outer receiver) provides subcarrier reliability information.
Preferably, described fec decoder mainly include time domain deinterleave, QAM demapping, LDPC and BCH decoding, data solution
Disturb.
Preferably, described ground digital information standard receiver directly does lower change to the every road TV programme signal receiving
Frequency moves 2-30MHz, signal is directly amplified, is then coupled in PLC-VLC network and carries out indoor distribution.
Preferably, described ground digital information standard receiver is by the DVB-C receiving digital TV in high resolution broadcast singal
First demodulate, in conjunction with the unique channel circumstance of PLC-VLC network and transmission feature, the data after demodulation is modulated to meet again
The TDS-OFDM signal of DTMB standard, is then coupled in PLC-VLC network and is distributed.
Preferably, the every road receiving DTMB digital TV in high resolution is broadcasted letter by described ground digital information standard receiver
Number directly do down coversion and move after 2-30MHz corresponds to power line and the intermediate-frequency band of visible light communication suitable for transmission, then
It is coupled on power line by way of linear amplifier amplifies, and then is distributed to the LED of not chummery and carry out broadcast covering.
Preferably, described ground digital information standard receiver is demodulated to the DVB-C signal receiving decoding gained
Code stream, as the multi-path high-definition digital TV broadcast signal code stream of input tuner, through randomization, channel coding and star
Multiplexed in frequency domain after seat mapping, formed the IDFT data block that length is 3780；This described 3780 symbol will be by
System DFT transform is time domain discrete sample value frame (7.56M/s sample frequency) that length is 3780, then in the protection of OFDM
It is spaced the PN sequence that intubating length is 512 as frame head, frame head and frame are combined into signal frame；OFDM frame is through for PLC-
The processing module of the VLC characteristic of channel, eventually passes quadrature frequency changer and completes the modulation in entirely " demodulation-modulation-distribution " pattern
Process, the signal modulating will be fed to coupler and be distributed to further in PLC-VLC network, thus realizing indoor high-definition digital
Comprehensive covering of TV signal.
Preferably, described user's receiving terminal is mobile phone, panel computer, digital TV in high resolution and desktop computer.
Compared with prior art, the present invention is a kind of is passed through based on the family multi-media gateway system of DTV-VLC key technology
In described ground digital information standard receiver, setting tuner, local oscillator drive analog-digital converter, are used for counting receipt signal
The automatic gain control unit of energy, filtering interpolation unit, channel equalizer and Hibert wave filter, extraneous cable television radio frequency
Signal (RF input signal) downconverts to little intermediate frequency through tuner (Tuner), drives analog-digital converter (ADC) to carry out by local oscillator
Sampling, automatic growth control (AGC) unit is that foundation carries out automatic growth control to the amplifier in Tuner with this sampled value,
And finally restoring the TS code stream of digital television program, the design of the present invention effectively reduces DTV-VLC, and to merge broadcast system actual
The software and hardware complexity of Project Realization, lifts efficiency of transmission, reduces processing delay, simplifies multimedia gateway device and produces work
Sequence, reduces production cost.
[brief description]
Fig. 1 be the present invention a kind of based on ground digital information in the family multi-media gateway system of DTV-VLC key technology
The operation principle structural representation of reference receiver.
Fig. 2 is a kind of structure based on signal frame in the family multi-media gateway system of DTV-VLC key technology of the present invention
Schematic diagram.
Fig. 3 be the present invention a kind of based in the family multi-media gateway system of DTV-VLC key technology demodulation-modulation-point
The modulation module structural representation of the pattern of sending out.
[specific embodiment]
For making the purpose of the present invention, technical scheme and advantage become more apparent, below in conjunction with drawings and Examples, to this
Invention is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, not
For limiting this invention.
Refer to Fig. 1 to Fig. 3, the present invention is a kind of to be included based on the family multi-media gateway system 1 of DTV-VLC key technology
For receive the transmitting of outdoor wireless broadcast base station ground digital television signal (DTMB) or by wire cable access wired
The ground digital information standard receiver of TV signal (DVB-C)；Described ground digital information standard receiver is integrated with DTMB/
DVB-C demodulating unit and PLC adaptation unit；
Described ground digital information standard receiver is registered one's residence DTMB signal described in receiving, by receiving, amplifying, and direct coupling
Conjunction is forwarded to PLC-VLC network and carries out in-door covering；
Described ground digital information standard receiver is registered one's residence DVB-C signal described in receiving, and to registering one's residence, DVB-C signal solves
Adjust, decode, restore digital TV video frequency code stream, then digital TV video frequency code stream is modulated to TDS-OFDM signal；
Described ground digital information standard receiver includes tuner, local oscillator drives analog-digital converter, be used for statistics receives
The automatic gain control unit of signal energy, filtering interpolation unit, channel equalizer and Hibert wave filter；The described external world is wired
TV RF signals (RF input signal) downconvert to little intermediate frequency through tuner (Tuner), drive analog-digital converter by local oscillator
(ADC) sampled, automatic growth control (AGC) unit is that foundation is carried out to the amplifier in Tuner automatically with this sampled value
Gain control, the data signal after ADC conversion carries out, after bandpass filtering and orthogonal transformation, being decomposed through Hibert wave filter
Become in-phase component (I road) and quadrature component (Q road) two-way；
Frame synchronization is carried out by computing cross-correlation, obtains the position of PN sequence, then by the analysis to PN sequence, enter one
Step carries out carrier synchronization, Timing Synchronization and channel estimation；Described time synchronization signals feed back to filtering interpolation unit, and signal is entered
Row correction of timing, and carry out further matched filtering obtain make each code element obtain optimum reception performance；The signal of carrier synchronization
Feed back to Digital Down Convert, for correcting frequency deviation；The signal of carrier correction and correction of timing is through cyclic convolution after treatment
Reconstructed module removes PN, and carries out channel equalization；The output of channel equalizer can directly carry out symbol de-maps and FEC solution
Code, and finally restore the TS code stream of digital television program.
Drive analog-digital converter, be used for by setting tuner in described ground digital information standard receiver, local oscillator
The automatic gain control unit of statistics receipt signal energy, filtering interpolation unit, channel equalizer and Hibert wave filter, extraneous
Radio-frequency signal of wired TV (RF input signal) downconverts to little intermediate frequency through tuner (Tuner), drives modulus to turn by local oscillator
Parallel operation (ADC) is sampled, and automatic growth control (AGC) unit is that foundation is carried out to the amplifier in Tuner with this sampled value
Automatic growth control, and finally restore the TS code stream of digital television program, the design of the present invention effectively reduces DTV-VLC and merges
The software and hardware complexity that broadcast system Practical Project is realized, lifts efficiency of transmission, reduces processing delay, simplifies multimedia network
Pass equipment production process, reduces production cost.
Family multi-media gateway device is receiving outdoor ground digital TV broadcast signal or cable digital TV broadcast letter
Number afterwards, further multi-channel tv programs are distributed in PLC-VLC network, thus realizing indoor digital TV in high resolution signal
Cover comprehensively.This project is intended, using two kinds of indoor digital TV in high resolution broadcast singal distribution modes, " receiving-demodulation-modulation-
Distribution " pattern and " reception-directly put-distribute " pattern
Preferably, the RF signal receiving is amplified by described tuner, and completing channel selects, and by the signal selecting from RF frequency
Section transforms to the intermediate-frequency band of a fixation；The voltage of described control tuner AGC is provided by intermediate-frequency section；Channel selection is led to
Cross the divide ratio changing PLL realizing.
Preferably, the channel estimation unit of described ground digital information standard receiver is divided into each OFDM block to provide channel
The estimation of response, to correct the data sampling that each receives；After completing Frequency Estimation, signal has also remained a fixation
Phase error, also contains this error in channel estimation, DTMB channel estimation base and PN sequence complete.
Preferably, described channel equalization part realizes channel equalization in frequency domain by FFT computing, and is soft-decision channel solution
Code device (outer receiver) provides subcarrier reliability information.
Preferably, described fec decoder mainly include time domain deinterleave, QAM demapping, LDPC and BCH decoding, data solution
Disturb.
Preferably, described ground digital information standard receiver directly does lower change to the every road TV programme signal receiving
Frequency moves 2-30MHz, signal is directly amplified, is then coupled in PLC-VLC network and carries out indoor distribution.
Preferably, described ground digital information standard receiver is by the DVB-C receiving digital TV in high resolution broadcast singal
First demodulate, in conjunction with the unique channel circumstance of PLC-VLC network and transmission feature, the data after demodulation is modulated to meet again
The TDS-OFDM signal of DTMB standard, is then coupled in PLC-VLC network and is distributed.
Preferably, the every road receiving DTMB digital TV in high resolution is broadcasted letter by described ground digital information standard receiver
Number directly do down coversion and move after 2-30MHz corresponds to power line and the intermediate-frequency band of visible light communication suitable for transmission, then
It is coupled on power line by way of linear amplifier amplifies, and then is distributed to the LED of not chummery and carry out broadcast covering.
This mode can effectively reduce DTV-VLC and merge the software and hardware complexity that broadcast system Practical Project is realized, and lifting passes
Defeated efficiency, reduces processing delay, simplifies multimedia gateway device production process, reduces production cost.Due to do not need demodulation or
Modulate received digital television signal again, therefore this mode of operation has significant low complex degree, low cost, easily realizes
Etc. advantage, provide a kind of solution of high performance-price ratio for promoting the interior depth covering of DTV-VLC family.
Preferably, described ground digital information standard receiver is demodulated to the DVB-C signal receiving decoding gained
Code stream, as the multi-path high-definition digital TV broadcast signal code stream of input tuner, through randomization, channel coding and star
Multiplexed in frequency domain after seat mapping, formed the IDFT data block that length is 3780；This described 3780 symbol will be by
System DFT transform is time domain discrete sample value frame (7.56M/s sample frequency) that length is 3780, then in the protection of OFDM
It is spaced the PN sequence that intubating length is 512 as frame head, frame head and frame are combined into signal frame；OFDM frame is through for PLC-
The processing module of the VLC characteristic of channel, eventually passes quadrature frequency changer and completes the modulation in entirely " demodulation-modulation-distribution " pattern
Process, the signal modulating will be fed to coupler and be distributed to further in PLC-VLC network, thus realizing indoor high-definition digital
Comprehensive covering of TV signal.
Preferably, described user's receiving terminal is mobile phone, panel computer, digital TV in high resolution and desktop computer.
Product majority in the market is multiple modules, the integrated product of multiple system, and customer experience degree is poor, and
And system hardware complexity is high, product stability is poor.The present invention combines VLC transceiver module and PLC adaptation module, with Mstar
Scheme chip is control core, by DTMB/DVB-C function, visible light communication Functional Design in same system, preferably carries
The stability that high product runs, Experience Degree is good.
The present invention is not simply VLC to be received and dispatched mould based on the family multi-media gateway system of DTV-VLC key technology
The module stack such as block, PLC adaptation module, DTMB/DVB-C module are got up, but the angle with single product, with Mstar DTV
Software and hardware system for core is it will be seen that the Functional Design such as optic communication, line communication transmission DTV DTMB/DVB-C exists
In same system.And based on the data of product design and terminal client demand analysis, redesign human-computer interaction interface, from
This end user role sets out, and designs brand-new human-computer interaction interface and operating process, allows multisystem cooperation become single product
Form carries out system combination, unified Style Design, and designs each connection and expansion interface, is easy to subsequently mutual with mobile device
Connection, starts a kind of new Multi-functional domestic electronic product form.
Using Mstar DTV system, complete design and the software development of DTMB/DVB-C, realize ground TV broadcast DTMB
With the reception of cable television DVB-C, multimedia storage and broadcasting and the several functions such as PVR recording, playback, time shift, shorten whole
Individual product development cycle, and can be quickly through every correlation technique certification.
Compared with prior art, the present invention is a kind of is passed through based on the family multi-media gateway system 1 of DTV-VLC key technology
In described ground digital information standard receiver, setting tuner, local oscillator drive analog-digital converter, are used for counting receipt signal
The automatic gain control unit of energy, filtering interpolation unit, channel equalizer and Hibert wave filter, extraneous cable television radio frequency
Signal (RF input signal) downconverts to little intermediate frequency through tuner (Tuner), drives analog-digital converter (ADC) to carry out by local oscillator
Sampling, automatic growth control (AGC) unit is that foundation carries out automatic growth control to the amplifier in Tuner with this sampled value,
And finally restoring the TS code stream of digital television program, the design of the present invention effectively reduces DTV-VLC, and to merge broadcast system actual
The software and hardware complexity of Project Realization, lifts efficiency of transmission, reduces processing delay, simplifies multimedia gateway device and produces work
Sequence, reduces production cost.
Invention described above embodiment, does not constitute limiting the scope of the present invention.Any in the present invention
Spirit and principle within modification, equivalent and improvement of being made etc., should be included in the claim protection model of the present invention
Within enclosing.
Claims (10)
1. a kind of family multi-media gateway system based on DTV-VLC key technology it is characterised in that：Including for receiving outdoor
The ground digital television signal (DTMB) of wireless broadcast base station transmitting or the cable TV signal (DVB- being accessed by wire cable
C ground digital information standard receiver)；Described ground digital information standard receiver is integrated with DTMB/DVB-C demodulating unit
And PLC adaptation unit；
Described ground digital information standard receiver is registered one's residence DTMB signal described in receiving, and by receiving, amplifying, and direct-coupling turns
It is dealt into PLC-VLC network and carry out in-door covering；
Described ground digital information standard receiver is registered one's residence DVB-C signal described in receiving, DVB-C signal of registering one's residence is demodulated,
Decoding, restores digital TV video frequency code stream, then digital TV video frequency code stream is modulated to TDS-OFDM signal；
Described ground digital information standard receiver includes tuner, local oscillator driving analog-digital converter, is used for counting receipt signal
The automatic gain control unit of energy, filtering interpolation unit, channel equalizer and Hibert wave filter；Described external world cable television
Radiofrequency signal (RF input signal) downconverts to little intermediate frequency through tuner (Tuner), drives analog-digital converter (ADC) by local oscillator
Sampled, automatic growth control (AGC) unit is that foundation carries out automatic gain control to the amplifier in Tuner with this sampled value
System, the data signal after ADC conversion carries out, after bandpass filtering and orthogonal transformation, being broken down into homophase through Hibert wave filter
Component (I road) and quadrature component (Q road) two-way；
Frame synchronization is carried out by computing cross-correlation, obtains the position of PN sequence, then by the analysis to PN sequence, enter further
Row carrier synchronization, Timing Synchronization and channel estimation；Described time synchronization signals feed back to filtering interpolation unit, and it is fixed that signal is carried out
Shi Jiaozheng, and carry out further matched filtering obtain make each code element obtain optimum reception performance；The signal feedback of carrier synchronization
To Digital Down Convert, for correcting frequency deviation；The signal of carrier correction and correction of timing is through reconstructing circular convolution after treatment
Module removes PN, and carries out channel equalization；The output of channel equalizer directly can carry out symbol de-maps and fec decoder, and
Finally restore the TS code stream of digital television program.
2. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 1, its feature exists
In：The RF signal receiving is amplified by described tuner, and completing channel selects, and the signal of selection is transformed to one from RF band
Fixing intermediate-frequency band；The voltage of described control tuner AGC is provided by intermediate-frequency section；Channel selection is passed through to change PLL's
Divide ratio is realizing.
3. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 2, its feature exists
In：The channel estimation unit of described ground digital information standard receiver is divided into each OFDM block to provide the estimation of channel response,
To correct the data sampling that each receives；After completing Frequency Estimation, signal has also remained a stationary phase error, letter
Road also contains this error in estimating, DTMB channel estimation base and PN sequence complete.
4. a kind of family multi-media gateway system based on DTV-VLC key technology as described in claim 1 or 3, its feature
It is：Described channel equalization part realizes channel equalization in frequency domain by FFT computing, and (external for soft-decision channel decoder
Receipts machine) subcarrier reliability information is provided.
5. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 4, its feature exists
In：Described fec decoder mainly include time domain deinterleave, QAM demapping, LDPC and BCH decoding, data de-scrambling.
6. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 1, its feature exists
In：Described ground digital information standard receiver directly does down coversion to the every road TV programme signal receiving and moves 2-
30MHz, signal is directly amplified, and is then coupled in PLC-VLC network and carries out indoor distribution.
7. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 1, its feature exists
In：The DVB-C receiving digital TV in high resolution broadcast singal is first demodulated by described ground digital information standard receiver, in conjunction with
The unique channel circumstance of PLC-VLC network and transmission feature, the data after demodulation is modulated to meet DTMB standard again
TDS-OFDM signal, is then coupled in PLC-VLC network and is distributed.
8. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 6, its feature exists
In：The every road receiving DTMB digital TV in high resolution broadcast singal is directly done lower change by described ground digital information standard receiver
After frequency moves the intermediate-frequency band corresponding to power line and visible light communication suitable for transmission for the 2-30MHz, then pass through Linear Amplifer
Device amplify mode be coupled on power line, and then be distributed to the LED of not chummery carry out broadcast cover.
9. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 7, its feature exists
In：Described ground digital information standard receiver is demodulated to the DVB-C signal receiving decoding gained code stream, as input
The multi-path high-definition digital TV broadcast signal code stream of tuner, after randomization, channel coding and constellation mapping
Frequency domain is multiplexed, and forms the IDFT data block that length is 3780；This described 3780 symbol will be by system DFT transform
The time domain discrete sample value frame (7.56M/s sample frequency) being 3780 for length, then in the protection interval intubating length of OFDM
PN sequence for 512, as frame head, frame head and frame is combined into signal frame；OFDM frame is through for the PLC-VLC characteristic of channel
Processing module, eventually pass the modulated process that quadrature frequency changer completes in entirely " demodulation-modulation-distribution " pattern, modulate
Signal will be fed to coupler and be distributed to further in PLC-VLC network, thus realizing indoor digital TV in high resolution signal
Cover comprehensively.
10. a kind of family multi-media gateway system based on DTV-VLC key technology as claimed in claim 1, its feature exists
In：Described user's receiving terminal is mobile phone, panel computer, digital TV in high resolution and desktop computer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109905341A (en) * | 2019-03-22 | 2019-06-18 | 国家电网有限公司 | A kind of high resolution audio and video ad hoc network data interaction system based on 230MHz wireless private network |
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