CN103078693A - Power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and device - Google Patents
Power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and device Download PDFInfo
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Abstract
The invention discloses a power-line-based digital terrestrial multimedia broadcasting (DTMB) transmission method and a power-line-based DTMB transmission device. The method comprises the following steps of: 1, generating or forwarding a DTMB broadcasting and television program signal, performing transmitter simulation processing on the signal, and coupling the signal to a power line for transmission by using a transmitter; 2, coupling and receiving the signal transmitted through the power line, performing receiver simulation processing on the signal, and performing channel decoding by using a receiver; and 3, performing signal source decoding on the signal subjected to the channel decoding, and playing or sharing the signal subjected to the signal source decoding in a multimedia terminal. A power line communication technology is used for finishing indoor multimedia broadcasting transmission and sharing, the conventional indoor multimedia transmission technology is effectively supplemented, the method is an effective method for the indoor coverage of a DTMB signal, and the method and the device have broad application prospect.
Description
Technical field
The present invention relates to family multi-media broadcast technology field, particularly a kind of DTMB(Digital Terrestrial Multimedia Broadcasting based on power line) broadcasting transmitting method and device.
Background technology
Along with all-round popularization and the enforcement of Digital Television, and the popularizing of information-based multimedia terminal, indoor multimedia broadcasting transmission technology and use the increasing concern that also is subject to industry.Have based on the multimedia broadcasting transmission technology of DTMB that transmission performance is good, equipment is widely used, cover low cost and other advantages, but because the huge decay of wireless signal by body of wall, there is certain technical difficulty in its indoor covering.In addition, a DTMB set-top box usually can only be for a television set provides multimedia service, and covering for the indoor multimedia broadcasting such as family, hotel industry, show business has increased expense, has brought inconvenience.
In order to reduce the cost of indoor multimedia broadcasting transmission, indoor multimedia technology of sharing based on WiFi is suggested, the scheme that becomes existing most widely used indoor multimedia broadcasting transmission and share, but still there are some very important shortcomings in it, and is bad such as the coverage condition of WiFi signal under complicated building environment, fail safe is not good, may have more electromagenetic wave radiation etc. to human body.
Along with the tremendous development of the communication technology, power line communication technology has entered people's the visual field again.Under indoor environment, to compare with other communication plans, the advantage of power line communication is: cost is low, a line is dual-purpose, coverage condition good.Therefore indoor multimedia broadcasting transmission and the secret sharing based on power-line broadband communication technology also is suggested and paid close attention to widely.
Summary of the invention
The technical problem that (one) will solve
The object of the invention is to provide a kind of indoor multimedia transmission and the solution of sharing, and a kind of DTMB broadcasting transmitting method and device based on power line specifically is provided.
(2) technical scheme
The invention provides a kind of DTMB broadcasting transmitting method based on power line, may further comprise the steps:
S1, transmitter produce or transmit DTMB broadcast TV program signal, afterwards described signal are carried out the transmitting terminal simulation process and be coupled on the power line transmitting;
S2, receiver coupling receive the signal that transmits on the above-mentioned power line, and it is carried out carrying out channel-decoding after the receiving terminal simulation process again;
S3, the signal behind the channel-decoding is carried out source coding, the signal behind the source coding is play in the multimedia terminal or shared.
Preferably, among the step S1, described transmitter produces DTMB broadcast TV program signal and refers to that described transmitter carries out existing broadcast TV program signal information source coding, DTMB chnnel coding, upconverts to the power line communication frequency range; If the program in the described transmitter behind the existing corresponding information source coding then need not carry out the information source coding step.
Preferably, among the step S1, described transmitter is transmitted DTMB broadcast TV program signal and is referred to that described transmitter is down-converted to the power line communication frequency range by antenna reception DTMB broadcast TV program signal and with the signal that receives.
Preferably, among the step S1, the mode of operation of described DTMB broadcast TV program signal comprises:
Pattern one, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.4, PN length is 945, and interleave depth is 720, and the clean code check of system is 9.626Mbps;
Pattern two, sub-carrier number are Isosorbide-5-Nitrae QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 10.396Mbps;
Pattern three, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.6, PN length is 945, and interleave depth is 720, and the clean code check of system is 14.438Mbps;
Pattern four, sub-carrier number are 1,16QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 20.791Mbps;
Pattern five, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.8, PN length is 420, and interleave depth is 720, and the clean code check of system is 21.658Mbps;
Pattern six, sub-carrier number are 3780,64QAM modulation, and the LDPC code check is that 0.6, PN length is 420, and interleave depth is 720, and the clean code check of system is 24.365Mbps;
Pattern seven, sub-carrier number are 1,32QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 25.985Mbps.
Preferably, among the step S1, described transmitting terminal simulation process comprises: signal filtering and signal amplify.
Preferably, among the step S2, described receiving terminal simulation process comprises: signal filtering, signal amplification and AGC.
Preferably, among the step S2, described channel-decoding comprises: signal synchronously, channel estimating, equilibrium, demodulation, deinterleaving, LDPC decoded operation.
Preferably, among the step S1, described power line communication frequency range is between 30kHz to 50MHz, and bandwidth is 6MHz or 7MHz or 8MHz.
The present invention also provides a kind of DTMB broadcasting transmitting device based on power line, and this device comprises: transmitter unit and receiver unit, wherein:
Described transmitter unit comprises:
DTMB broadcast TV program signal generator module is used for existing broadcast TV program signal is carried out information source coding, DTMB chnnel coding, upconverts to the power line communication frequency range;
Transmitting terminal simulation process module links to each other with described DTMB broadcast TV program signal generator module, is used for the signal of power line communication frequency range is carried out filtering and amplification;
Transmitting terminal coupler module links to each other with described transmitting terminal simulation process module, is used for the signal coupling of described transmitting terminal simulation process module output is transmitted to power line;
Described receiver unit comprises:
Receiving terminal coupler module is used for that the signal coupling on the power line is received and be transferred to receiving terminal simulation process module and processes;
Receiving terminal simulation process module links to each other with described receiving terminal coupler module, is used for the signal that is coupled from power line is carried out filtering, amplification and AGC;
Channel decoding module links to each other with described receiving terminal simulation process module, be used for to the signal after the described receiving terminal simulation process carry out synchronously, channel estimating, equilibrium, demodulation, deinterleaving, channel decoding operate;
The source coding module links to each other with described channel decoding module, is used for the signal behind the channel-decoding is carried out source coding;
Multimedia or sharing module link to each other with described source coding module, are used for the signal behind the source coding being play in the multimedia terminal or being shared.
Preferably, described DTMB broadcast TV program signal generator module can replace with DTMB broadcast TV program signal forwarding module, is used for by antenna reception DTMB broadcast TV program signal, it is down-converted to the power line communication frequency range.
(3) beneficial effect
Based on the present invention program's DTMB broadcasting transmitting method and device, utilize power line to finish indoor multimedia broadcasting transmission and shared, be that the effective of existing indoor multimedia service replenished, have good application prospect.
Description of drawings
Fig. 1 is the flow chart based on the DTMB broadcasting transmitting method of power line that the present invention proposes;
Fig. 2 is the DTMB broadcasting transmitting structure drawing of device one based on power line that the present invention proposes, for generation of the DTMB broadcast TV program and carry out the transmission of indoor multimedia broadcasting;
Fig. 3 is the DTMB broadcasting transmitting structure drawing of device two based on power line that the present invention proposes, and is used for transmitting the DTMB broadcast TV program and carries out indoor multimedia broadcasting transmission.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the flow chart based on the DTMB broadcasting transmitting method of power line that the present invention proposes, and specifically may further comprise the steps:
S1, transmitter produce or transmit DTMB broadcast TV program signal, afterwards described signal are carried out the transmitting terminal simulation process and be coupled on the power line transmitting;
S2, receiver coupling receive the signal that transmits on the above-mentioned power line, and it is carried out carrying out channel-decoding after the receiving terminal simulation process again;
S3, the signal behind the channel-decoding is carried out source coding, the signal behind the source coding is play in the multimedia terminal or shared.
Preferably, among the step S1, described transmitter produces DTMB broadcast TV program signal and refers to that described transmitter carries out existing broadcast TV program signal information source coding, DTMB chnnel coding, upconverts to the power line communication frequency range;
If the program in the described transmitter behind the existing corresponding information source coding then need not carry out the information source coding step.
Preferably, among the step S1, described transmitter is transmitted DTMB broadcast TV program signal and is referred to that described transmitter is down-converted to the power line communication frequency range by antenna reception DTMB broadcast TV program signal and with the signal that receives.
Preferably, among the step S1, the mode of operation of described DTMB broadcast TV program signal comprises:
Pattern one, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.4, PN length is 945, and interleave depth is 720, and the clean code check of system is 9.626Mbps;
Pattern two, sub-carrier number are Isosorbide-5-Nitrae QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 10.396Mbps;
Pattern three, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.6, PN length is 945, and interleave depth is 720, and the clean code check of system is 14.438Mbps;
Pattern four, sub-carrier number are 1,16QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 20.791Mbps;
Pattern five, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.8, PN length is 420, and interleave depth is 720, and the clean code check of system is 21.658Mbps;
Pattern six, sub-carrier number are 3780,64QAM modulation, and the LDPC code check is that 0.6, PN length is 420, and interleave depth is 720, and the clean code check of system is 24.365Mbps;
Pattern seven, sub-carrier number are 1,32QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 25.985Mbps.
Preferably, among the step S1, described transmitting terminal simulation process comprises: signal filtering and signal amplify.
Preferably, among the step S2, described receiving terminal simulation process comprises: signal filtering, signal amplification and AGC.
Preferably, among the step S2, described channel-decoding comprises: signal synchronously, channel estimating, equilibrium, demodulation, deinterleaving, LDPC decoded operation.
Preferably, among the step S1, described power line communication frequency range is between 30kHz to 50MHz, and bandwidth is 6MHz or 7MHz or 8MHz.
As preferably, can consider 2MHz to 10MHz, 12MHz is to frequency ranges such as 20MHz.
Embodiment 1
A kind of embodiment of a kind of DTMB broadcasting transmitting method based on power line that embodiment 1 has provided that the present invention proposes.
In the present embodiment, transmitter produces DTMB broadcast TV program signal and is used for indoor multimedia broadcasting transmission, the mode of operation of DTMB program signal is pattern one: sub-carrier number is 3780, the 16QAM modulation, the LDPC code check is 0.4, PN length is 945, and interleave depth is 720, and the clean code check of system is 9.626Mbps.
S1, transmitter produce or transmit DTMB broadcast TV program signal, and signal is carried out the transmitting terminal simulation process and be coupled on the power line transmitting;
In the present embodiment, transmitter produces the DTMB program signal, at first existing programme signal is carried out the information source coding, then carry out the DTMB chnnel codings such as LDPC encodes, interweaves, constellation mapping, framing according to the parameter of pattern one signal after to the information source coding, down-convert the signals to 2MHz to the power line communication frequency range of 10MHz, after the transmitting terminal simulation process such as filtering and signal amplification, couple a signal on the power line by coupler and to transmit.
S2, receiver receive the signal coupling on the power line, and signal is carried out after the receiving terminal simulation process signal being carried out channel-decoding;
In the present embodiment, receiver by coupler with the reception that is coupled of the signal on the power line, after carrying out to the received signal the receiving terminal simulation process such as filtering, signal amplification and AGC, signal is carried out the channel-decoding operations such as signal is synchronous, channel estimating, equilibrium, demodulation, deinterleaving, LDPC decoding.
S3, the signal behind the channel-decoding is carried out source coding, and in the multimedia terminal, play or share.
In the present embodiment, the signal behind the channel-decoding is carried out source coding, just can in indoor multimedia terminal (such as TV, computer, DVD etc.), play or shared.The user also can according to demand, select required broadcast or shared programme content.
Embodiment 2
A kind of embodiment of embodiment 2 has provided that the present invention proposes a kind of DTMB broadcasting transmitting based on power line.
In the present embodiment, transmitter is transmitted DTMB broadcast TV program signal and is used for indoor multimedia broadcasting transmission, the mode of operation of DTMB program signal is pattern three: sub-carrier number is 3780, the 16QAM modulation, the LDPC code check is 0.6, PN length is 945, and interleave depth is 720, and the clean code check of system is 14.438Mbps.
S1, transmitter produce or transmit DTMB broadcast TV program signal, and signal is carried out the transmitting terminal simulation process and be coupled on the power line transmitting;
In the present embodiment, transmitter is transmitted the DTMB program signal, by antenna reception DTMB program signal, down-convert the signals to 12MHz to the power line communication frequency range of 20MHz, after the transmitting terminal simulation process such as filtering and signal amplification, couple a signal on the power line by coupler and to transmit.
S2, receiver receive the signal coupling on the power line, and signal is carried out after the receiving terminal simulation process signal being carried out channel-decoding;
In the present embodiment, receiver by coupler with the reception that is coupled of the signal on the power line, after carrying out to the received signal the receiving terminal simulation process such as filtering, signal amplification and AGC, signal is carried out the channel-decoding operations such as signal is synchronous, channel estimating, equilibrium, demodulation, deinterleaving, LDPC decoding.
S3, the signal behind the channel-decoding is carried out source coding, and in the multimedia terminal, play or share.
In the present embodiment, the signal behind the channel-decoding is carried out source coding, just can in indoor multimedia terminal (such as TV, computer, DVD etc.), play or shared.The user also can according to demand, select interested broadcast program contents.
Embodiment 3
A kind of embodiment of embodiment 3 has provided that the present invention proposes a kind of DTMB broadcasting transmitting based on power line.
In the present embodiment, transmitter is transmitted DTMB broadcast TV program signal and is used for indoor multimedia broadcasting transmission, the mode of operation of DTMB program signal is pattern five: sub-carrier number is 3780, the 16QAM modulation, the LDPC code check is 0.8, PN length is 420, and interleave depth is 720, and the clean code check of system is 21.658Mbps.
S1, transmitter produce or transmit DTMB broadcast TV program signal, and signal is carried out the transmitting terminal simulation process and be coupled on the power line transmitting;
In the present embodiment, transmitter is transmitted the DTMB program signal, by antenna reception DTMB program signal, down-convert the signals to 22MHz to the power line communication frequency range of 30MHz, after the transmitting terminal simulation process such as filtering and signal amplification, couple a signal on the power line by coupler and to transmit.
S2, receiver receive the signal coupling on the power line, and signal is carried out after the receiving terminal simulation process signal being carried out channel-decoding;
In the present embodiment, receiver by coupler with the reception that is coupled of the signal on the power line, after carrying out to the received signal the receiving terminal simulation process such as filtering, signal amplification and AGC, signal is carried out the channel-decoding operations such as signal is synchronous, channel estimating, equilibrium, demodulation, deinterleaving, LDPC decoding.
S3, the signal behind the channel-decoding is carried out source coding, and in the multimedia terminal, play or share.
In the present embodiment, the signal behind the channel-decoding is carried out source coding, just can in indoor multimedia terminal (such as TV, computer, DVD etc.), play or shared.The user also can according to demand, select interested broadcast program contents.
Embodiment 4
Fig. 2 is the structure chart one of apparatus of the present invention, the invention provides a kind of DTMB broadcasting transmitting device based on power line, and for generation of the DTMB broadcast TV program and carry out the transmission of indoor multimedia broadcasting, this device comprises transmitter unit and receiver unit, wherein:
Transmitter unit comprises:
DTMB broadcast TV program signal generator module is used for existing programme signal is carried out information source coding, DTMB chnnel coding, upconverted to the power line communication frequency range;
Transmitting terminal simulation process module links to each other with DTMB broadcast TV program signal generator module, is used for the signal of power line communication frequency range is carried out filtering and amplification;
Transmitting terminal coupler module links to each other with transmitting terminal simulation process module, is used for the signal coupling of transmitting terminal simulation process module output is transmitted to power line;
Receiver unit comprises:
Receiving terminal coupler module is used for that the signal coupling on the power line is received and be transferred to receiving terminal simulation process module and processes;
Receiving terminal simulation process module links to each other with receiving terminal coupler module, is used for the signal that is coupled from power line is carried out filtering, amplification and AGC;
Channel decoding module links to each other with receiving terminal simulation process module, be used for to the signal after the receiving terminal simulation process carry out synchronously, the operations such as channel estimating, equilibrium, demodulation, deinterleaving, channel decoding;
The source coding module links to each other with channel decoding module, is used for the signal behind the channel-decoding is carried out source coding;
Multimedia or sharing module link to each other with the source coding module, are used for the media stream behind the source coding being play in the multimedia terminal or being shared.
Embodiment 5
Fig. 3 is the structure chart two of apparatus of the present invention, the invention provides a kind of DTMB broadcasting transmitting device based on power line, is used for transmitting the DTMB broadcast TV program and carries out indoor multimedia broadcasting transmission, and this device comprises transmitter unit and receiver unit, wherein:
Transmitter unit comprises:
DTMB broadcast TV program signal forwarding module is used for by antenna reception DTMB broadcast TV program signal, programme signal is down-converted to the power line communication frequency range;
Transmitting terminal simulation process module links to each other with DTMB broadcast TV program signal forwarding module, is used for the signal of power line communication frequency range is carried out filtering and amplification;
Transmitting terminal coupler module links to each other with transmitting terminal simulation process module, is used for the signal coupling of transmitting terminal simulation process module output is transmitted to power line;
Receiver unit comprises:
Receiving terminal coupler module is used for that the signal coupling on the power line is received and be transferred to receiving terminal simulation process module and processes;
Receiving terminal simulation process module links to each other with receiving terminal coupler module, is used for the signal that is coupled from power line is carried out filtering, amplification and AGC;
Channel decoding module links to each other with receiving terminal simulation process module, be used for to the signal after the receiving terminal simulation process carry out synchronously, the operations such as channel estimating, equilibrium, demodulation, deinterleaving, channel decoding;
The source coding module links to each other with channel decoding module, is used for the signal behind the channel-decoding is carried out source coding;
Multimedia or sharing module link to each other with the source coding module, are used for the media stream behind the source coding being play in the multimedia terminal or being shared.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (10)
1. the DTMB broadcasting transmitting method based on power line is characterized in that, may further comprise the steps:
S1, transmitter produce or transmit DTMB broadcast TV program signal, afterwards described signal are carried out the transmitting terminal simulation process and be coupled on the power line transmitting;
S2, receiver coupling receive the signal that transmits on the above-mentioned power line, and it is carried out carrying out channel-decoding after the receiving terminal simulation process again;
S3, the signal behind the channel-decoding is carried out source coding, the signal behind the source coding is play in the multimedia terminal or shared.
2. the method for claim 1, it is characterized in that, among the step S1, described transmitter produces DTMB broadcast TV program signal and refers to that described transmitter carries out existing broadcast TV program signal information source coding, DTMB chnnel coding, upconverts to the power line communication frequency range;
If the program in the described transmitter behind the existing corresponding information source coding does not then carry out the information source coding step.
3. the method for claim 1, it is characterized in that, among the step S1, described transmitter is transmitted DTMB broadcast TV program signal and is referred to that described transmitter is down-converted to the power line communication frequency range by antenna reception DTMB broadcast TV program signal and with the signal that receives.
4. the method for claim 1 is characterized in that, among the step S1, the mode of operation of described DTMB broadcast TV program signal comprises:
Pattern one, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.4, PN length is 945, and interleave depth is 720, and the clean code check of system is 9.626Mbps;
Pattern two, sub-carrier number are Isosorbide-5-Nitrae QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 10.396Mbps;
Pattern three, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.6, PN length is 945, and interleave depth is 720, and the clean code check of system is 14.438Mbps;
Pattern four, sub-carrier number are 1,16QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 20.791Mbps;
Pattern five, sub-carrier number are 3780,16QAM modulation, and the LDPC code check is that 0.8, PN length is 420, and interleave depth is 720, and the clean code check of system is 21.658Mbps;
Pattern six, sub-carrier number are 3780,64QAM modulation, and the LDPC code check is that 0.6, PN length is 420, and interleave depth is 720, and the clean code check of system is 24.365Mbps;
Pattern seven, sub-carrier number are 1,32QAM modulation, and the LDPC code check is that 0.8, PN length is 595, and interleave depth is 720, and the clean code check of system is 25.985Mbps.
5. the method for claim 1 is characterized in that, among the step S1, described transmitting terminal simulation process comprises: signal filtering and signal amplify.
6. the method for claim 1 is characterized in that, among the step S2, described receiving terminal simulation process comprises: signal filtering, signal amplification and AGC.
7. the method for claim 1 is characterized in that, among the step S2, described channel-decoding comprises: signal synchronously, channel estimating, equilibrium, demodulation, deinterleaving, LDPC decoded operation.
8. method as claimed in claim 2 or claim 3 is characterized in that, among the step S1, described power line communication frequency range is between 30kHz to 50MHz, and bandwidth is 6MHz or 7MHz or 8MHz.
9. the DTMB broadcasting transmitting device based on power line is characterized in that, this device comprises transmitter unit and receiver unit, wherein:
Described transmitter unit comprises:
DTMB broadcast TV program signal generator module is used for existing broadcast TV program signal is carried out information source coding, DTMB chnnel coding, upconverts to the power line communication frequency range;
Transmitting terminal simulation process module links to each other with described DTMB broadcast TV program signal generator module, is used for the signal of power line communication frequency range is carried out filtering and amplification;
Transmitting terminal coupler module links to each other with described transmitting terminal simulation process module, is used for the signal coupling of described transmitting terminal simulation process module output is transmitted to power line;
Described receiver unit comprises:
Receiving terminal coupler module is used for that the signal coupling on the power line is received and be transferred to receiving terminal simulation process module and processes;
Receiving terminal simulation process module links to each other with described receiving terminal coupler module, is used for the signal that is coupled from power line is carried out filtering, amplification and AGC;
Channel decoding module links to each other with described receiving terminal simulation process module, be used for to the signal after the described receiving terminal simulation process carry out synchronously, channel estimating, equilibrium, demodulation, deinterleaving, channel decoding operate;
The source coding module links to each other with described channel decoding module, is used for the signal behind the channel-decoding is carried out source coding;
Multimedia or sharing module link to each other with described source coding module, are used for the signal behind the source coding being play in the multimedia terminal or being shared.
10. device as claimed in claim 9, it is characterized in that, described DTMB broadcast TV program signal generator module can replace with DTMB broadcast TV program signal forwarding module, is used for by antenna reception DTMB broadcast TV program signal, it is down-converted to the power line communication frequency range.
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| CN103402220A (en) * | 2013-07-03 | 2013-11-20 | 北京航空航天大学 | Device and method for acquiring and optimizing DTMB (digital terrestrial television multimedia broadcasting) single frequency network coverage rate |
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| CN105246092B (en) * | 2014-07-10 | 2019-04-16 | 中国移动通信集团公司 | A kind of in-door covering signal enhancing equipment and its signal processing method |
| CN106230485A (en) * | 2016-09-12 | 2016-12-14 | 深圳市凯利华电子有限公司 | A kind of indoor wireless distribution system based on DTV VLC transmission system |
| CN106385612A (en) * | 2016-09-12 | 2017-02-08 | 深圳市凯利华电子有限公司 | Household multimedia gateway system based on DTV-VLC key technology |
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