CN108259190A - A kind of high-performance Web transmission network management system based on RIA - Google Patents
A kind of high-performance Web transmission network management system based on RIA Download PDFInfo
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- CN108259190A CN108259190A CN201611231621.6A CN201611231621A CN108259190A CN 108259190 A CN108259190 A CN 108259190A CN 201611231621 A CN201611231621 A CN 201611231621A CN 108259190 A CN108259190 A CN 108259190A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/04—Network management architectures or arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Television Systems (AREA)
Abstract
The invention discloses a kind of high-performance Web transmission network management systems based on RIA.A kind of high-performance Web transmission network management system based on RIA includes wireless receiving module, signal processing module and Signal interface module.The wireless receiving module reception carries the radiofrequency signal of audio and video business.The radiofrequency signal that the signal processing module receives the wireless receiving module carries out TDS OFDM demodulations, decoding and synchronization process, obtains audio-video signal, and export the audio-video signal.The Signal interface module receives the audio-video signal of the signal processing module output.A kind of high-performance Web transmission network management system based on RIA of the present invention can receive and handle with high reliability radiofrequency signal to obtain the audio-video signal of high quality, and device integration is high, have the advantages of convergence error is small, and convergence time is short.
Description
Technical field
The present invention relates to digital TV technologies, relate more specifically to a kind of high-performance Web transmission based on RIA
Network management system.
Background technology
At present, digital television terrestrial broadcasting（Digital Television Terrestrial Broadcasting,
DTTB）The achievable stage is had reached, the DTTB transmission standards announced on our times mainly there are 3 kinds：U.S.Advanced Television system
The system committee（Advanced Television System Committee, ATSC）The ATSC standards of formulation, the number in Europe
Video Broadcasting-Terrestrial（Digital Video Terrestrial Broadcasting-Terrestrial, DVB-T）, Japan
Terrestrial Integrated Service digital broadcasting（Integrated Service Digital Broadcasting-Terrestrial,
ISDB-T）.Based on the further investigation to this 3 kinds of terrestrial digital television systems, Tsinghua University is proposed based on time-domain synchronous orthogonal
Frequency division multiplexing（Time Domain Synchronous Orthogonal Frequency Division Multiplex, TDS-
OFDM）The ground digital television broadcast transmission system of modulation technique, and adopted by China, be established as the DTTB standards in China, life
Entitled " ground digital multimedia TV broad cast（Terrestrial Digital Multimedia Television
Broadcasting, DMB-T）Transmission system ".
DMB-T Transmission systems use following items major technique：
The orthogonal multiple carrier technology of Domain Synchronous.Frequency caused by the greatest difficulty of terrestrial wideband wireless transmission is multipath selects
Property decline, OFDM technology then in terms of contrary frequency Selective intensity have unique advantage.However, the orthogonality between subcarrier
Strict requirements are proposed to synchronous.Europe forms its core technology using full frequency-domain processing mode --- the OFDM of coding（Coded
Orthogonal Frequency Division Multiplex, COFDM）Technology, since its system synchronization and channel estimation are mutual
For condition, the technical measures such as complicated iterative algorithm and high power synchronizing pilot need to be used.And TDS-OFDM passes through time domain and frequency domain
Mixed processing simply and easily realizes quick code word capture and steady synchronized tracking.
Pseudo-random sequence (Pseudo-Noise, PN) filling technique of protection interval.In order in multidiameter delay spread channels
In avoid intersymbol interference, DVB employs the OFDM protection intervals of cyclic prefix filling, its efficiency transmitted is made to lose.
DMB-T has invented the high protection synchronous transmission technology based on PN sequence spread spectrum techniques, and fills OFDM protection intervals with it, make be
The spectrum utilization efficiency of system improves 10%, and has more than 20dB synchronous protection gains.
Fast Channel estimation technique.It is longer for the iterative channel estimation process of existing terrestrial DTV transmission standard
（Actual parameter estimation about needs 1.024ms）Deficiency, DMB-T use new TDS-OFDM channel estimation techniques, by just
Related and Fourier transform is handed over to realize Fast Channel estimation（Actual parameter estimation about needs 0.6ms）, improve system movement
Receptivity.
The error correcting technique that forward error correction coding is combined with phase mapping.For the noise using multicarrier COFDM technologies
The reality more poor with respect to VSB single-carrier technologies than thresholding, DMB-T have invented a kind of new system cascade error correction Internal Code and minimum Europe
Family name's distance maximizes mapping techniques, and the system signal noise ratio thresholding using multi-transceiver technology is made to obtain more than 10% improvement.
With the frame structure of Absolute Time Synchronization.DMB-T transport protocols devise the multi-frame structure with Absolute Time Synchronization, side
Just automatic wake-up function is set, and reaches power saving purpose, supports portable reception；It is same to be conducive to single frequency network with Absolute Time Synchronization mechanism
Step sends the function control of signal, and DMB-T single-frequency network synchronizations equipment is made to be easier to realize than the same category of device of international existing standard.
Its physical channel frame structure is as shown in Figure 1：
Frame structure is classification, and a basic frame structure is known as a signal frame.Frame group is defined as 255 signal frames, and first
Frame definition is frame group head.Signal frame in frame group has unique frame number, and from 0 to 254, signal frame number (then) is encoded into be worked as label
In the frame synchronization sequence of front signal frame.Superframe is defined as a framing group, and the top layer of frame structure is known as superframe group.Superframe is numbered,
From 0 to largest frames group number.Hyper Frame Number (SFN) is encoded into superframe group number (SFGN) in first frame group head of superframe together.
SFGN is defined as the calendar date of superframe pocket transmission, and superframe group is repeated cyclically using a consecutive days as the period, its quilt
The first two byte being encoded in first frame group head of a superframe in downgoing line superframe group.In Beijing time 00：00：
00AM, physical channel frame structure are reset and start a new superframe group.One signal frame is made of two parts：Frame synchronization and
Frame.Frame synchronization is identical with the baseband signalling rate of frame, it is specified that for 7.56MSps.Frame synchronizing signal using walsh codes with
Machine sequence, to realize more identification of base stations.Frame synchronization include preamble, frame synchronization sequence with it is rear synchronous.For a signal frame group
In different signal frames, have different frame synchronizing signals.So frame synchronization can be as the frame synchronization spy of a distinctive signal frame
It levies and is used to identify.Frame synchronization uses binary phase shift keying（Binary Phase Shift Key, BPSK）It modulates to obtain
Stable synchronization.
System information transmits.DMB-T transport protocols set uniqueness for the signal frame of each 500 μ S information data of length
The frame head of address facilitates the identification and separation of data information, has the technical foundation of fusion multi-service broadcast.
At present, Tsing-Hua University is directed to the above-mentioned technology of DMB-T Transmission systems, and it is " ground digital multimedia to have applied for patent name
Television broadcasting system ", the patent of Patent No. 00123597.4.The patent diselosesll：A kind of T-DMB electricity
Viewing system, as shown in Fig. 2, it includes：One network control center 10, at least one transmitter 20 and at least one receiver
30, the digital code stream transmitted is at least transmitted the first and second signal frames to transmitter 20 from the network control center 10,
Received signal modulation is emitted in the air by transmitter 20, is received by receiver 30.
For TDS-OFDM modulation techniques, modulation step includes the core technology that above-mentioned Tsing-Hua University's patent uses：A, it inputs
MPEG-TS code streams are after channel coding is handled in the IDFT data blocks that frequency domain formation length is 3780；B, using DFT by IDFT
Data block is transformed to the time domain discrete sample value frame that length is 3780,7.56M/s sample value；C, it is inserted into the protection interval of OFDM
The PN sequences that length is 378 are as frame head；D, frame head and frame are combined into the signal frame that time span is 550；E, using tool
The FIR low pass filter of linear phase-delay characteristic carries out frequency-domain shaping to signal；F, baseband signal is subjected to up-conversion tune
It makes in RF carrier wave.
It can be seen from the above, propose a kind of T-DMB television system and its transmission currently for DMB-T
Scheme, but for user side receive Transmission system transmission RF carrier wave and audio-video signal is obtained to the processing of RF carrier wave,
The better solution of neither one.
Now, due to the display terminal resolution ratio of " high definition " digital television in T-DMB television system
Reach 1920 × 1080 pixels, visual effect number is cost-effective, therefore demand of the people to " high definition " digital television is constantly in
Reveal growing trend.However, for these reasons, current digital TV in high resolution handles audio-video signal to RF carrier wave
There is also deficiencies for aspect.Therefore, it is necessary to provide a kind of height based on RIA that a kind of energy high reliability receives and processes RF carrier wave
The method that high resolution audio and video accesses in performance Web transmission network management systems and interactive digital television front end system.
Invention content
The object of the present invention is to provide a kind of high-performance Web transmission network management system based on RIA, energy high reliability connects
It receives and handles RF carrier wave so as to obtain the audio-video signal of high quality.
To achieve these goals, a kind of high-performance Web transmission network management system based on RIA provided by the invention includes nothing
Line receiving module, signal processing module and Signal interface module.The wireless receiving module reception carries audio and video business
Radiofrequency signal.The radiofrequency signal that the signal processing module receives the wireless receiving module carries out TDS-OFDM solutions
Tune, decoding and synchronization process, obtain audio-video signal, and export the audio-video signal.The Signal interface module receives institute
State the audio-video signal of signal processing module output.
In one embodiment of the invention, the signal processing module includes demodulation module, decoder module and synchronization
Recovery module.The demodulation module carries out TDS-OFDM demodulation to the radiofrequency signal for carrying audio and video business, obtains base
Band signal.The baseband signal that the decoder module demodulates the demodulation module is decoded, and obtains the audio-video code stream.
The synchronous recovery module carries out the audio-video code stream of decoder module decoding output in time domain and/or frequency domain same
Step.
Preferably, the demodulation module include carrier recovery unit, TDS-OFDM demodulating units, channel estimating unit and
Synchronous recovery unit.The radio frequency for carrying audio and video business that the carrier recovery unit is received from the wireless receiving module
The carrier signal that extraction demodulates for TDS-OFDM in signal.The TDS-OFDM demodulating units use the carrier recovery unit
The carrier wave for restoring to obtain is demodulated the radiofrequency signal received, obtains baseband signal.The channel estimating unit is according to institute
It states the radiofrequency signal that wireless receiving module receives and carries out channel estimation, so as to be demodulated to the TDS-OFDM demodulating units
Baseband signal compensates.The synchronous recovery unit restores the synchronous letter for the radiofrequency signal that the wireless receiving module receives
Breath.
Preferably, the decoder module includes deinterleaving unit and error correction decoding unit.The deinterleaving unit is to institute
It states the baseband signal after demodulation module demodulation and is deinterleaved transformation, and output transform data.The error correction decoding unit utilizes
Error correction decoding algorithm is decoded the transformation data of the deinterleaving unit output, obtains audio-video signal.
In one embodiment of the invention, the wireless receiving module includes an antenna.
Compared with prior art, a kind of high-performance Web transmission network management system based on RIA of the invention can be by wirelessly connecing
It receives module and receives radiofrequency signal with high reliability, and pass through signal processing module and handle radiofrequency signal with high reliability to obtain height
The audio-video signal of quality.In addition, a kind of high-performance Web transmission network management system based on RIA of the present invention is by by wireless receiving
Module and the signal processing module with demodulating and decoding integrate, and improve level of integrated system.In addition, the present invention adopts
Radiofrequency signal is received with the mode of wireless access, saves the use of a large amount of cables or optical cable, reduces networking cost, while
Subscribers' line is saved, reduces user cost.
By following description and with reference to attached drawing, the present invention will become more fully apparent, these attached drawings are used to explain the present invention
Embodiment.
Description of the drawings
Fig. 1 is prior art physical channel frame structure schematic diagram.
Fig. 2 is prior art T-DMB television system block diagram.
Fig. 3 is a kind of structure diagram of the high-performance Web transmission network management system based on RIA of the present invention.
Fig. 4 is a kind of structural frames of the signal processing module of the high-performance Web transmission network management system based on RIA shown in Fig. 3
Figure.
Fig. 5 is the flow chart of the method that high resolution audio and video accesses in interactive digital television front end system of the present invention.
Specific embodiment
The embodiment of the present invention described referring now to attached drawing, similar element numbers represent similar element in attached drawing.
With reference to figure 3, a kind of high-performance Web transmission network management system based on RIA of the present embodiment includes wireless receiving
Module 110, signal processing module 120 and Signal interface module 130.The reception of wireless receiving module 110 carries sound and regards
The radiofrequency signal of frequency business.The wireless receiving mould 110 includes antenna.The signal processing module 120 is by the wireless receiving
The radiofrequency signal that module 110 receives carries out TDS-OFDM demodulation, decoding and synchronization process, obtains audio-video signal, and defeated
Go out the audio-video signal.The Signal interface module 130 receives the audio-video signal that the signal processing module 120 exports.
In detail, with reference to figure 4, the signal processing module 120 includes demodulation module 121, decoder module 122 and synchronizes
Recovery module 123.The demodulation module 121 carries out TDS-OFDM demodulation to the radiofrequency signal for carrying audio and video business,
Obtain baseband signal.The baseband signal that the decoder module 122 demodulates the demodulation module 121 is decoded, and obtains institute
State audio-video code stream.The synchronous recovery module 123 to the decoder module 122 decoding output the audio-video code stream when
Domain and/or frequency domain synchronize.
The demodulation module 121 of the signal processing module 120 includes carrier recovery unit 121b, TDS-OFDM demodulating unit
121a, channel estimating unit 121c and synchronous recovery unit 121d.The carrier recovery unit 121b is from the wireless receiving
In the radiofrequency signal for audio and video business that module 110 received carry extraction for TDS-OFDM demodulation carrier signal.Institute
TDS-OFDM demodulating units 121a is stated to believe the radio frequency received using the carrier wave that the carrier recovery unit 121b restores
It number is demodulated, obtains baseband signal.The channel estimating unit 121c is penetrated according to what the wireless receiving module 110 received
Frequency signal carries out channel estimation, so as to be compensated to the TDS-OFDM demodulating units 121a baseband signals demodulated.Institute
It states synchronous recovery unit 121d and restores the synchronizing information of radiofrequency signal that the wireless receiving module 110 receives.
The decoder module 122 of the signal processing module 120 includes deinterleaving unit 122a and error correction decoding unit
122b.The unit 122a that deinterleaves is deinterleaved transformation, and export to the baseband signal after the demodulation module 121 demodulation
Convert data.The error correction decoding unit 122b is using error correction decoding algorithm to the transformation number of the deinterleaving unit 122a outputs
According to being decoded, audio-video signal is obtained.
With reference to figure 5, the method that high resolution audio and video accesses in interactive digital television front end system of the invention is including as follows
Step：（1）Receive the radiofrequency signal (step S1) for carrying audio and video business；（2）It extracts and is used for from the radiofrequency signal
The carrier signal (step S2) of TDS-OFDM demodulation;（3）The radiofrequency signal received is demodulated using the carrier wave, is obtained
Baseband signal (step S3);（4）Channel estimation is carried out according to the radiofrequency signal, so as to be compensated to the baseband signal
(step S4);（5）The synchronizing information (step S5) of the radiofrequency signal received described in recovery；（6）The baseband signal is carried out
Deinterleave transformation, and output transform data (step S6)；（7）The transformation data are decoded using error correction decoding algorithm,
Obtain audio-video signal (step S7)；（8）The audio-video code stream is synchronized (step S8) in time domain or/and frequency domain；（9）
The audio-video signal (step S9) is exported to terminal.
Above in association with most preferred embodiment, invention has been described, but the invention is not limited in implementations disclosed above
Example, and modification, equivalent combinations that various essence according to the present invention carry out should be covered.
Claims (4)
1. a kind of high-performance Web transmission network management system based on RIA, including：
Wireless receiving module, the wireless receiving module reception carry the radiofrequency signal of audio and video business；
Signal processing module, the radiofrequency signal that the signal processing module receives the wireless receiving module carry out TDS-
OFDM demodulation, decoding and synchronization process obtain audio-video signal, and export the audio-video signal；And
Signal interface module, the Signal interface module receive the audio-video signal of the signal processing module output.
2. a kind of high-performance Web transmission network management system based on RIA as described in claim 1, it is characterised in that：The signal
Processing module includes：
Demodulation module, the demodulation module carry out TDS-OFDM demodulation to the radiofrequency signal for carrying audio and video business, obtain
To baseband signal；
Decoder module, the baseband signal that the decoder module demodulates the demodulation module are decoded, and are obtained the sound and are regarded
Frequency code stream；And
Synchronous recovery module, the synchronous recovery module is to the audio-video code stream of decoder module decoding output in time domain
And/or frequency domain synchronizes.
3. a kind of high-performance Web transmission network management system based on RIA as claimed in claim 2, it is characterised in that：The demodulation
Module includes：
Carrier recovery unit, the carrier recovery unit carry audio and video business from what the wireless receiving module received
The carrier signal that extraction demodulates for TDS-OFDM in radiofrequency signal;
TDS-OFDM demodulating units, the carrier wave pair that the TDS-OFDM demodulating units are restored using the carrier recovery unit
The radiofrequency signal received is demodulated, and obtains baseband signal;
Channel estimating unit, the channel estimating unit carry out channel according to the radiofrequency signal that the wireless receiving module receives
Estimation, the baseband signal so as to be demodulated to the TDS-OFDM demodulating units compensate;
Synchronous recovery unit, the synchronous recovery unit restore the synchronous letter for the radiofrequency signal that the wireless receiving module receives
Breath.
4. a kind of high-performance Web transmission network management system based on RIA as claimed in claim 2, it is characterised in that：The decoding
Module includes：
Unit is deinterleaved, the unit that deinterleaves is deinterleaved transformation to the baseband signal after demodulation module demodulation, and
Output transform data；And error correction decoding unit, the error correction decoding unit deinterleave list using error correction decoding algorithm to described
The transformation data of member output are decoded, and obtain audio-video signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611231621.6A CN108259190A (en) | 2016-12-28 | 2016-12-28 | A kind of high-performance Web transmission network management system based on RIA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611231621.6A CN108259190A (en) | 2016-12-28 | 2016-12-28 | A kind of high-performance Web transmission network management system based on RIA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108259190A true CN108259190A (en) | 2018-07-06 |
Family
ID=62718946
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611231621.6A Pending CN108259190A (en) | 2016-12-28 | 2016-12-28 | A kind of high-performance Web transmission network management system based on RIA |
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| Country | Link |
|---|---|
| CN (1) | CN108259190A (en) |
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2016
- 2016-12-28 CN CN201611231621.6A patent/CN108259190A/en active Pending
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180706 |
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| WD01 | Invention patent application deemed withdrawn after publication |