CN107690076A - A kind of reusable formula Wireless video transmission method - Google Patents
A kind of reusable formula Wireless video transmission method Download PDFInfo
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- CN107690076A CN107690076A CN201710735573.2A CN201710735573A CN107690076A CN 107690076 A CN107690076 A CN 107690076A CN 201710735573 A CN201710735573 A CN 201710735573A CN 107690076 A CN107690076 A CN 107690076A
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
The invention discloses a kind of reusable formula Wireless video transmission method, this method is using gathering transmitter unit collection vision signal and be converted to TS flow datas, and the maximum FFT points design interleaver and external interleaver configured as needed, and RS codings are carried out successively to TS flow datas, scrambler, outer intertexture, convolutional encoding, after interior intertexture and framing processing, the OFDM data frame formed is converted by IFFT, post processing be radio frequency signal, in receiving side, after the reception display unit is demodulated processing to radio frequency signal, vision signal is provided for display playback equipment.In said process, when system needs to be arranged to the pattern of other FFT points, only need easy configuration FFT points that the reuse of current system can be achieved, without change data transmission structure and system framework, suitable for carrying out wireless video transmission under different scenes demand, development cost is not only reduced, and shortens the construction cycle.
Description
Technical field
The present invention relates to method of transmitting video data, more particularly to a kind of reusable formula Wireless video transmission method.
Background technology
Subnormal subgroup frequency multiplexing technique (Orthogonal Frequency Division Multiplexing, OFDM) is sent out
Since exhibition, used in many communication systems.Each carrier wave in OFDM is mutually orthogonal, and each carrier wave is at one
There is integer carrier cycle in symbol time, the zero point of each spectrum of carrier zero point and adjacent carrier is overlapping, reduces carrier wave
Between interference, intercarrier overlaps, and improves band efficiency, orthogonal subcarrier can utilize Fast Fourier Transform (FFT)
IFFT/FFT realizes modulation and demodulation.Ofdm communication technology has good anti-multipath jamming characteristic, low complex degree characteristic, high frequency
Utilization rate characteristic is composed, based on these excellent characteristics, is favored in wireless video field of image transmission, ofdm communication transmission skill
Art and its relevant device system are also developed rapidly, data transmission system, DAB and Video transmission system, nobody
The fields such as machine are widely applied.Therefore, it is very must to study the wireless video transmission system based on ofdm communication technology
Will with it is important.
In existing wireless video transmission system, used OFDM digital modulation techniques are usually using fixed number
Sub-carrier number, the pilot signal of fixed number, the corresponding FFT using fixed points realize ofdm communication scheme, and its neutron carries
FFT points are closely bound up used by the designs such as ripple number, number of pilots, interleaver, deinterleaver and ofdm system.Such skill
Art scheme sets fixed technical scheme generally directed to special scenes, for example OFDM modulation schemes are arranged into fixed 2048 points
FFT mode realization, its sub-carrier number, number of pilots etc. are also fixed number, and corresponding channel coding portions are also needed to set and fixed
The interior external interleaver of size and depth, RS codings etc..But the OFDM implementations of this fixed FFT points, to a certain extent
Difficulty is brought to system multiplexing, if under similar scene environment or use condition with some general character, according to actual feelings
, it is necessary to redesign interior external interleaver, deinterleaving when the factor such as ofdm system performance, overhead is multiplexed to system in condition
The modules such as device, coder, subcarrier number, pilot tone, or even including rewriteeing Fast Fourier Transform (FFT) FFT/IFFT modules, channel
Estimation module etc..Such technical scheme brings difficult and inconvenience to system reuse, causes the longer construction cycle, can not be simple
Efficiently reuse the system.As can be seen here, it is reusable based on OFDM modulation-demodulation techniques there is an urgent need to one kind in the prior art
Wireless video transmission solution.
The content of the invention
The technical problem to be solved in the present invention is, in view of the shortcomings of the prior art, there is provided a kind of only to set required FFT
Points are the existing system module of reusable, without change data structure and system framework, and then reduce development cost, shorten and open
Send out the reusable formula Wireless video transmission method in cycle.
In order to solve the above technical problems, the present invention adopts the following technical scheme that.
A kind of reusable formula Wireless video transmission method, this method realize that the system includes having based on a system
The collection transmitter unit of OFDM modulation modules and the reception display unit with OFDM demodulation module, methods described includes as follows
Step：Step S1, the collection transmitter unit collection vision signal, and packaging multiplexing is TS streams after video signal compression is handled
Data；Step S2, the interleaver and external interleaver of regular length, the maximum configured as needed are configured for OFDM modulation modules
The corresponding sub-carrier number of FFT points determines the capacity of the interleaver and external interleaver；Step S3, the OFDM modulate mould
After TS flow datas to be carried out to block RS codings, scrambler, outer intertexture, convolutional encoding, interior intertexture and framing processing successively, OFDM numbers are formed
According to frame；OFDM data frame is carried out IFFT conversion by step S4, the OFDM modulation modules, and the data after being converted to IFFT are entered successively
Row insertion protection interval GI, up-sampling and low-pass filtering treatment；Step S5, the transmitter unit that gathers is by low pass filtered in step S4
Data after ripple processing launch wireless signal after carrying out DAC conversions, RF carrier wave modulation and power amplification successively；Step S6, institute
The wireless signal for receiving the display unit acquisition collection transmitter unit transmitting is stated, and the wireless signal is subjected to low noise successively
Inputted after amplification, RF carrier wave demodulation ADC conversion process to OFDM demodulation module；Step S7, the OFDM demodulation module is to it
The data of input carry out FFT after carrying out bandpass filtering, down-sampling, synchronization process and removal protection interval GI successively；Step
S8, the OFDM demodulation module takes out pilot tone from the data after FFT and makees channel estimation, in conjunction with the number outside pilot tone
According to channel equalization is done, treat to enter planetary demapping after the completion of channel equalization；Step S9, the OFDM demodulation module is to constellation
After data after demapping carry out interior deinterleaving, folding coding, outer deinterleaving, descrambling and RS decodings processing successively, output data
TS flows；Step S10, the reception display unit data TS streams are demultiplexed successively and video decoding process after, load on
Show playback equipment.
Preferably, in the step S1, the collection transmitter unit utilizes ccd video camera collection HDMI video signal.
Preferably, in the step S1, the collection transmitter unit is compressed using video encoder to vision signal
Handle, in the step S10, the display unit that receives carries out video using Video Decoder to the data TS streams after demultiplexing
Decoding process.
Preferably, the video encoder is H.264/H.265 encoder, H.264/H.265 the Video Decoder is
Decoder.
Preferably, in the step S3, the framing processing includes constellation mapping and insertion pilot tone.
Preferably, during the insertion pilot tone, the number of pilot tone and position are counted according to FFT and determined.
Preferably, in the step S4, insertion protection interval GI length is counted according to FFT to be determined.
Preferably, in the step S5, the signal after being modulated using 2W power amplifiers to RF carrier wave carries out power amplification.
Preferably, in the step S7, the process that the OFDM demodulation module synchronizes processing includes Frequency Synchronization, adopted
Sample synchronization and sign synchronization.
Preferably, in the step S7, the OFDM demodulation module is using the bandpass filter with a width of 6MHz to input
Data carry out bandpass filtering.
In reusable formula Wireless video transmission method disclosed by the invention, vision signal is gathered simultaneously using transmitter unit is gathered
TS flow datas are converted to, and the maximum FFT points design interleaver and external interleaver configured as needed, and to TS flow datas
After carrying out RS codings, scrambler, outer intertexture, convolutional encoding, interior intertexture and framing processing successively, the OFDM data frame formed is passed through
Cross IFFT conversion, post processing be radio frequency signal, in receiving side, the display unit that receives is to radio frequency signal progress
After demodulation process, vision signal is provided for display playback equipment.In said process, when system needs to be arranged to other FFT points
Pattern when, only need easy configuration FFT points i.e. can be achieved current system reuse, without change data transmission structure with
System framework, compared to existing technologies, the present invention need not redesign each module, suitable for being carried out under different scenes demand
Wireless video transmission, development cost is not only reduced, and shorten the construction cycle.
Brief description of the drawings
Fig. 1 is collection transmitter unit and the flow chart for receiving display unit implementation procedure.
Fig. 2 is OFDM modulation modules and the flow chart of OFDM demodulation module implementation procedure.
Embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples.
The invention discloses a kind of reusable formula Wireless video transmission method, with reference to shown in Fig. 1 and Fig. 2, this method is based on
One system realizes that the system is including the collection transmitter unit 1 with OFDM modulation modules 10 and with OFDM demodulation module 20
Reception display unit 2, methods described include have the following steps：
Step S1, the collection transmitter unit 1 gather vision signal, and packaging multiplexing is after video signal compression is handled
TS flow datas；
Step S2, the interleaver and external interleaver of regular length are configured for OFDM modulation modules 10, as needed configuration
The corresponding sub-carrier number of maximum FFT points determine the capacity of the interleaver and external interleaver；
TS flow datas are carried out RS codings, scrambler, outer intertexture, convolution and compiled by step S3, the OFDM modulation modules 10 successively
After code, interior intertexture and framing processing, OFDM data frame is formed；In the step, the framing processing includes constellation mapping and insertion
Pilot tone, further, during the insertion pilot tone, the number of pilot tone and position are counted according to FFT and determined；
OFDM data frame is carried out IFFT conversion by step S4, the OFDM modulation modules 10, the data after being converted to IFFT
Carry out inserting protection interval GI, up-sampling and low-pass filtering treatment successively, further, insertion protection interval GI length according to
FFT points determine；
Data after low-pass filtering treatment in step S4 are carried out DAC and turned by step S5, the collection transmitter unit 1 successively
Change, launch wireless signal after RF carrier wave modulation and power amplification；
Step S6, the display unit 2 that receives obtain the wireless signal that the collection transmitter unit 1 is launched, and by the nothing
Line signal is inputted to OFDM demodulation module 20 after carrying out low noise amplification, RF carrier wave demodulation ADC conversion process successively；
Step S7, the data that the OFDM demodulation module 20 inputs to it carry out successively bandpass filtering, down-sampling, it is synchronous at
FFT is carried out after reason and removal protection interval GI, in the step, the OFDM demodulation module 20 synchronizes the process of processing
Including Frequency Synchronization, sample-synchronous and sign synchronization；
Step S8, pilot tone is taken out in data of the OFDM demodulation module 20 after FFT and makees channel estimation, then tied
Close the data outside pilot tone and do channel equalization, treat to enter planetary demapping after the completion of channel equalization；
Step S9, the OFDM demodulation module 20 carries out interior deinterleaving to the data after constellation demapping successively, convolution is translated
After code, outer deinterleaving, descrambling and RS decodings processing, output data TS streams；
Step S10, the reception display unit 2 data TS streams are demultiplexed successively and video decoding process after, add
It is loaded in display playback equipment.
In above-mentioned reusable formula Wireless video transmission method, vision signal and be converted to using gathering transmitter unit 1 and gathering
TS flow datas, and the maximum FFT points design interleaver and external interleaver configured as needed, and TS flow datas are entered successively
After row RS codings, scrambler, outer intertexture, convolutional encoding, interior intertexture and framing processing, the OFDM data frame formed is passed through into IFFT
Conversion, post processing be radio frequency signal, in receiving side, the display unit 2 that receives is demodulated to radio frequency signal
After processing, vision signal is provided for display playback equipment.In said process, when system needs to be arranged to the mould of other FFT points
During formula, only need easy configuration FFT points that the reuse of current system can be achieved, without change data transmission structure and system
Framework, compared to existing technologies, the present invention need not redesign each module, wireless suitable for being carried out under different scenes demand
Transmission of video, development cost is not only reduced, and shorten the construction cycle.
In application process, required maximum FFT points can be configured according to actual environment, such as, by existing money
The limitation in source, when need to change memory ram size, the FFT mode of other points, based on above-mentioned characteristic, nothing of the present invention can be selected
Each functional module need to be redesigned, facilitates system reuse, and there is the transformat of TS streams good system environments to fit
Ying Xingyu transmission characteristics.
As a kind of preferred embodiment, in the step S1, the collection transmitter unit 1 utilizes ccd video camera collection HDMI
Vision signal.
On Video coding and decoded portion, in the step S1, the collection transmitter unit 1 utilizes video encoder pair
Vision signal is compressed processing, in the step S10, the reception display unit 2 using Video Decoder to demultiplexing after
Data TS stream carry out video decoding process.Further, the video encoder is H.264/H.265 encoder, described to regard
Frequency decoder is H.264/H.265 decoder.
On the output par, c of radio frequency signal, the signal after being modulated using 2W power amplifiers to RF carrier wave carries out work(
Rate is amplified.
As a kind of preferred embodiment, in the step S7, the OFDM demodulation module 20 utilizes the band logical with a width of 6MHz
Wave filter carries out bandpass filtering to the data of input.
In order to preferably describe technical scheme, reusable formula Wireless video transmission method of the present invention actually should
Following examples are referred in.
Embodiment one
The present embodiment carries out encoding compression processing exemplified by being wirelessly transferred 1080P30 video sources, using H.265 encoder,
Configurable 512,1024, the 2048 point FFT of design OFDM modulation /demodulation modules, to realize the repetition of wireless video transmission system
Utilize.
First, HDMI video signal is gathered using high-definition camera, passes through H.265 coder module encoding compression processing
Afterwards, picture quality is further improved, and less data volume (bandwidth is small) is advantageous to remote wireless transmission, H.265 encodes
Device module compressed bit stream after being packaged into 188 byte TS streams by TS flow modules of packing, is sent into according to ISO/IEC 13818-1 standards
OFDM modulation modules are handled.
OFDM modulation modules first complete RS codings, scrambling, outer intertexture, convolutional encoding, interior interleaving treatment.Wherein, interleaver
Capacity by corresponding sub-carrier number under the required maximum FFT points number system of configuration be reference data, to meet interleaver reuse.This
In embodiment, the required maximum FFT points of configuration are 2048, and it is 1656 that sub-carrier number is set under the conditions of being somebody's turn to do, therefore interior external interleaver is big
It is small to be arranged to 1656.To allow the interleaver to deposit the sequence of integer RS code lengths, RS codings using substance system RS (255,
239, t=8) punctured codes RS (207,187) derived from code, then interleaver can deposit 8 RS codes (207*8=1656), to TS
After data are using RS (207,187) codings, handled using the Code scrambling technique scrambling of DVB-T standards, outer intertexture is done after scrambler processing
Processing, external interleaver are set to the staggered of 46*36=1656, and interior coding uses convolutional encoding, and interior intertexture uses 72*23=
1656 it is staggered.No matter 512,1024,2048 FFT modes are configured, and channel coding and interleaving block are all fixed using this
Structure, without redesigning interleaver size and interleave depth.
OFDM modulation module framing process parts, in framing process complete digital modulation (constellation mapping) led with insertion
Frequently, the number of pilot tone is determined with position by FFT points.In the present embodiment, for 2048 FFT modes, its pilot tone number is set
For 37, pilot frequency locations are followed successively by 0,48,87,121,156,192,231,265,300,333,432,483,525,581,636,
714,759,790,834,873,901,939,984,1100,1151,1207,1250,1307,1350,1400,1450,1499,
1540,1580,1621,1651,1683；For 1024 FFT modes, it is 19 to set its pilot tone number, and pilot frequency locations are followed successively by
0,48,87,121,156,192,231,265,300,333,432,483,525,581,636,714,759,790,834；For
512 FFT modes, it is 10 to set its pilot tone number, and pilot frequency locations are followed successively by 0,48,87,121,156,231,265,300,
333,402, also pilot tone can be set entirely by reference to DVB-T standards.Digital modulation mode selects QPSK, 16QAM, 64QAM, is modulating
While insert frequency pilot sign.OFDM frames for framing is completed are sent into IFFT conversion modules and perform IFFT, by remaining position
Set to 0 processing.By taking 2048 point FFT as an example, subcarrier takes 1656 positions, and pilot tone takes 37 positions, then residue 355
Data on (2048-1656-37) individual position set to 0 processing.Because channel coding and interleaving block employ changeless knot
Structure, exemplified by meeting maximum FFT points digital modeling, the interleaver of 1656 sizes is unified for, can 1 for 2048 FFT modes
Secondary completion digital modulation and insertion pilot tone, IFFT, insertion protection interval, up-sampling processing；For 1024 FFT modes, then
The same operations such as 2 times 1024 (zero point of+19 pilot tone of 828 subcarrier+177) point IFFT need to be done；For 512 FFT modes, then
The same operations such as 4 times 512 (zero point of+10 pilot tone of 414 subcarrier+88) point IFFT need to be done.When configuration system FFT points are respectively
2048th, 1024,512 when, the system will automatically by digital modulation (constellation mapping), insertion pilot tone, IFFT, insertion protection interval
Each circulation performs 1,2,4 time respectively for GI, up-sampling module, to take the data in the interleaver of a full storage state,
And this kind of set-up mode is unrelated with transmitting data frame structure, can unify to complete the operation of 2048 point data symbols, without changing data
Structural transmission mode.
In OFDM modulation modules, IFFT conversion modules perform IFFT operations, and FFT module performs FFT operations, it is desirable to
IFFT/FFT transform lengths are sufficiently large, in order to be able to realize the IFFT/FFT conversion of short length.In the present embodiment, design
IFFT/FFT maximums transform length is 2048 points, then according to the periodicity of IFFT/FFT twiddle factors, 1024,512 point IFFT/
FFT can realize that system is done directly by 2048 point IFFT/FFT, without redesigning the module.
In OFDM modulation modules, insertion protection interval GI (cyclic prefix) operations, it has performed the protection added after IFFT
Interval GI length is determined by FFT points.In the present embodiment, GI length is arranged to the 1/32 of FFT length.If thus it is configured to
2048th, during 1024,512 FFT modes, then corresponding GI length is respectively 64,32,16.Up-sampling module is completed to adopt on signal
Sample function, the present embodiment are made 3 times of up-samplings to data, then sent through DAC module, and so far transmitting terminal completes OFDM modulation
Institute is functional.
Analog conversion function is completed using DAC modular converters, its conversion accuracy is 10bits, passes through radio frequency module afterwards
Carrier modulation is done, by modulates baseband signals in 490MHz working frequencies, is passed through after improving power output by power amplification PA modules
Antenna is launched, in the present embodiment, using the PA devices of 2W watt levels.
Receiving terminal, enhanced processing is done to the small-signal received by low-noise amplifier LNA modules first, then penetrated
Frequency RF modules do carrier wave demodulation to it, are recovered by 490MHz working frequencies to baseband signal, are held after down coversion by ADC modular converters
Row analog-digital conversion function, its conversion accuracy are 10bits, and OFDM demodulation module is sent into after converting and completes base band signal process.
In OFDM demodulation module, first carry out bandpass filtering and down-sampling is handled, in the present embodiment, bandpass filter uses
6MHz bandwidth, down-sampling processing correspondingly perform lower 3 samplings.Synchronization process is then done to signal, including Frequency Synchronization, sampling are together
Step, sign synchronization, the data for completing synchronizing function are performed and remove protection interval GI operations.Then, FFT is done to signal,
Herein inverse operation each other is converted with IFFT.In addition, pilot tone is taken out to do channel estimation from the data after FFT, by believing
Road estimation parametric joint FFT remainder data (being free of pilot tone) does channel equalization, and constellation is sent into after the completion of channel equalization
De-mapping module performs digital demodulation operation.
In OFDM demodulation module, the transmission data to completing constellation demapping, perform channel decoding and handled with deinterleaving, it is complete
Into interior deinterleaving, folding coding, outer deinterleaving, descrambling, RS decodings processing.In the present embodiment, employ using 2048 point FFT as ginseng
The interleaver size of benchmark is examined, thus when constellation demapping module output data fills up an interleaver, solution friendship can be carried out
The processing such as knit, decode.Therefore for 2048 FFT modes, whole interleaver can be filled up 1 time；For 1024 FFT modes
Speech, then need 2 FFT data just to fill up whole interleaver；For 512 FFT modes, then 4 FFT numbers are needed
According to can just fill up whole interleaver.Comparably, for the OFDM modulation /demodulation modules of 2048,1024,512 FFT modes,
Interior deinterleaving, folding coding, outer deinterleaving, descrambling, RS decoding modules will circulate 1,2,4 time respectively, to ensure to receive data
The interleaver of 1656 sizes is filled up, for subsequent treatment, without redesigning these modules according to required FFT points.With
Channel code and interleaving module is mutually echoed, and using corresponding deinterleaving, decoded mode, in the present embodiment, is decoded using Viterbi
(folding coding) decodes with RS.
The TS flow datas exported using TS stream demultiplexing modules to OFDM demodulation module perform de-multiplex operation, to remove TS
Header etc., the naked code stream of H.265 compression after TS is operated will be solved and be sent into respective decoder module execution H.265 decoding operate, it is extensive
Raw video image data are rebuild again, and show playing video data on the display device.The wireless video transmission system with
Exemplified by 2048 FFT modes, if being limited by existing resource, when need to reduce memory ram size, using 1024,512 point FFT moulds
It formula etc., can simply be multiplexed, without redesigning each functional module, facilitate system reuse, and the transformat of TS streams has
Good system application environment adaptability and transmission characteristic.
Reusable formula Wireless video transmission method disclosed by the invention, pass through the data transfer knot to ofdm communication scheme
Structure, RS compile (translating) code, scrambler, outer (solution) interweave, convolution volume (translating) code, interior (solution) intertexture, pilot tone, IFFT/FFT, protection interval,
Design is reused in the modules such as channel estimation, on the premise of not change data structure, system framework, need to only be simply provided required
FFT points can efficiently be multiplexed system above module, give full play to the effect of existing system module, without redesigning,
Reduce development cost and design cycle.It is visible based on above characteristic, present invention is suitably applied to radio communication, mobile communication,
The fields such as DVB (DVB), high-definition television (HDTV), and there is preferable application prospect.
Simply preferred embodiments of the present invention described above, are not intended to limit the invention, all technology models in the present invention
Interior done modification, equivalent substitution or improvement etc. are enclosed, should be included in the range of of the invention protect.
Claims (10)
1. a kind of reusable formula Wireless video transmission method, it is characterised in that this method is based on system realization, the system bag
Include the collection transmitter unit (1) with OFDM modulation modules (10) and the reception display unit with OFDM demodulation module (20)
(2), methods described includes having the following steps：
Step S1, collection transmitter unit (1) the collection vision signal, and packaging multiplexing is TS after video signal compression is handled
Flow data；
Step S2, the interleaver and external interleaver of regular length are configured for OFDM modulation modules (10), is configured as needed
The corresponding sub-carrier number of maximum FFT points determines the capacity of the interleaver and external interleaver；
Step S3, the OFDM modulation modules (10) TS flow datas are carried out successively RS codings, scrambler, outer intertexture, convolutional encoding,
After interior intertexture and framing processing, OFDM data frame is formed；
Step S4, the OFDM modulation modules (10) by OFDM data frame carry out IFFT conversion, to IFFT convert after data according to
It is secondary to carry out inserting protection interval GI, up-sampling and low-pass filtering treatment；
Step S5, the collection transmitter unit (1) data after low-pass filtering treatment in step S4 are carried out successively DAC conversions,
RF carrier wave is modulated and launches wireless signal after power amplification；
Step S6, the wireless signal for receiving display unit (2) and obtaining collection transmitter unit (1) transmitting, and by the nothing
Line signal is inputted to OFDM demodulation module (20) after carrying out low noise amplification, RF carrier wave demodulation ADC conversion process successively；
Step S7, the data that the OFDM demodulation module (20) inputs to it carry out bandpass filtering, down-sampling, synchronization process successively
FFT is carried out with after removal protection interval GI；
Step S8, the OFDM demodulation module (20) take out pilot tone from the data after FFT and make channel estimation, in conjunction with
Data outside pilot tone do channel equalization, treat to enter planetary demapping after the completion of channel equalization；
Step S9, the OFDM demodulation module (20) data after constellation demapping are carried out successively interior deinterleaving, folding coding,
It is outer to deinterleave, after descrambling and RS decodings processing, output data TS streams；
Step S10, the reception display unit (2) data TS streams are demultiplexed successively and video decoding process after, loading
In display playback equipment.
2. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that described in the step S1
Transmitter unit (1) is gathered using ccd video camera collection HDMI video signal.
3. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that described in the step S1
Collection transmitter unit (1) is compressed processing to vision signal using video encoder, and in the step S10, described receive shows
Show that unit (2) carries out video decoding process using Video Decoder to the data TS streams after demultiplexing.
4. reusable formula Wireless video transmission method as claimed in claim 3, it is characterised in that the video encoder is
H.264/H.265 encoder, the Video Decoder are H.264/H.265 decoder.
5. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that described in the step S3
Framing processing includes constellation mapping and insertion pilot tone.
6. reusable formula Wireless video transmission method as claimed in claim 5, it is characterised in that the insertion pilot tone process
In, the number of pilot tone and position are counted according to FFT and determined.
7. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that in the step S4, insertion
Protection interval GI length is counted according to FFT and determined.
8. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that in the step S5, utilize
Signal after 2W power amplifiers are modulated to RF carrier wave carries out power amplification.
9. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that described in the step S7
The process that OFDM demodulation module (20) synchronizes processing includes Frequency Synchronization, sample-synchronous and sign synchronization.
10. reusable formula Wireless video transmission method as claimed in claim 1, it is characterised in that described in the step S7
OFDM demodulation module (20) carries out bandpass filtering using the bandpass filter with a width of 6MHz to the data of input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710735573.2A CN107690076A (en) | 2017-08-24 | 2017-08-24 | A kind of reusable formula Wireless video transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710735573.2A CN107690076A (en) | 2017-08-24 | 2017-08-24 | A kind of reusable formula Wireless video transmission method |
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