CN105141977B - Multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device - Google Patents
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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
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
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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
- H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
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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 encoded video stream packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
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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
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/4425—Monitoring of client processing errors or hardware failure
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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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
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Abstract
The present invention relates to a kind of multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device, including: code stream contrast module and display module, original audio code stream and reception audio code stream are compared by described code stream contrast module by bit, original video code stream and reception video code flow are compared by bit；Described display module shows described result of the comparison.By the present invention, MIMO-type transmitting-receiving environment is tested, adjusts the parameter of transmitting-receiving environment in real time, with obtain adapt to local transceiver channel most preferably receive and dispatch environment.
Description
The present invention is Application No. 201310229095.X, filing date June 8 in 2013 day,
The divisional application of the patent of bright entitled " multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device ".
Technical field
The present invention relates to digital TV field, particularly relate to a kind of multiple-input and multiple-output MIMO-type transmitting-receiving
Environment measuring device.
Background technology
MIMO (Multiple-Input Multiple-Out-put) system is one and applies to 802.11n
Core technology.802.11n be IEEE continue 802.11b a wireless local area network technology brand-new after g, speed
Degree is up to 600Mbps.Meanwhile, proprietary MIMO technology can improve existing 802.11a/b/g network
Performance.This technology is proposed in 1908 by Marconi the earliest, and he utilizes multiple antennas to suppress letter
Road declines.According to transmitting-receiving two-end antenna amount, relative to common SISO (Single-Input
Single-Output) system, MIMO can also include SIMO (Single-Input
Multi-ple-Output) system and MISO (Multiple-Input Single-Output) system.MIMO
Represent multiple-input and multiple-output, be widely adopted in forth generation mobile communication technology standard, such as IEEE
802.16e (Wimax), Long Term Evolution (LTE).Mark at new generation of wireless LAN (WLAN)
In standard, it is generally used for IEEE 802.11n but it also may for other 802.11 technology.MIMO has
Time be referred to as space diversity because he use multiple spatial channel transmission and receive data.Only website (moves
Dynamic equipment) or access point (AP) support to dispose MIMO during MIMO.MIMO technology
Application, make space become one and may be used for putting forward high performance resource, and wireless system can be increased
Coverage.
DVB (DVB, Digital Video Broadcasting), is by " DVB Project
The a series of DTV Open Standards recognized by the world safeguarded." DVB Project " is one
By the industrial organization of more than 300 member compositions, it is by european telecommunications standards institute (European
Telecommunications Standards Institute, ETSI), Europe electronic standardization tissue
(European Committee for Electrotechnical Standardization, CENELEC) and Europe
" the joint specialist that continent Broadcasting Union (European Broadcasting Union, EBU) constitutes jointly
Group " (Joint Technical Committee, JTC) initiate.DVB system transfers mode has as follows
Several: satellite television (DVB-S and DVB-S2), cable television (DVB-C), terrestrial television
(DVB-T), hand-held terrestrial wireless (DVB-H).These standards define the physical layer of transmission system
With data link layer.Equipment by synchronous parallel interface (synchronous parallel interface,
SPI), synchronous serial interface (synchronous serial interface, SSI), or Asynchronous Serial Interface
(asynchronous serial interface, ASI) is mutual with physical layer.Data are transmitted with MPEG-2
The mode of stream is transmitted, and requires to meet tightened up restriction (DVB-MPEG).To mobile terminal it is
Time compressed transmission data standard (DVB-H) be currently under among test.These transmission means
Differ primarily in that the modulation system of use, because the requirement of the frequency bandwidth of they application different is not
With.The DVB-S utilizing high frequency carrier uses QPSK modulation system, utilizes the DVB-C of low frequency carrier signal
Use QAM-64 modulation system, and utilize the DVB-T of VHF and UHF carrier wave to use COFDM
Modulation system.
Therefore, the characteristic of channel fading is suppressed to be used for ground electricity the multiple antennas that uses of mimo system
Depending on (DVB-T), to solve owing to including taxi, the mobile vehicle of bus itself has shifting
Dynamic speed is fast, position is not fixed, it may appear that move away from the local situation of launching centre, due to
The decline of signal, can cause receiving the problem that signal is the most weak, television-quality is poor, correspondingly, research and development
The DVB-T transmitter and receiver of multiple-input and multiple-output MIMO-type.
But, because televiewer is more and more higher to the accuracy requirement of data transmit-receive, and existing many
Transmission and the reception model comparision of the digital TV broadcast signal of input multi output MIMO-type are fixed, nothing
The parameters that method is transmitted by adjustment in real time and received adjusts transmitting-receiving environment, suitable local to obtain
Most preferably receive and dispatch environment, people cannot obtain original attainable high-accuracy audio, video data receive
Sending out, have impact on spectators watches enthusiasm.
Accordingly, it would be desirable to a kind of multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device, transform original
Single type, the transmitting-receiving test system of underaction, user can arrange transmitting-receiving environment voluntarily and obtain
The audio, video data of high accuracy such that it is able to it is fixed to be carried out in test area by the transmitting-receiving environment determined
Transmitter and receiver processed, the sound the most accurately realizing being best suitable for local channel circumstance in different regions regards
Frequently data transmit-receive, brings best seeing and hearing enjoyment to TV user.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of multiple-input and multiple-output MIMO-type transmitting-receiving ring
Border test device, introduces code stream contrast device, to the audio, video data received and original audio frequency and video number
According to comparing, to obtain relevant statistical information, according to comparative result, audio, video data is compressed
Processing module, scrambling Multiplexing module, channel data coding module, channel data decoder module and information source
Data decoder module adjusts in real time, it is thus achieved that be best suitable for the optimal receive-transmit system of local channel.
According to an aspect of the present invention, it is provided that a kind of multiple-input and multiple-output MIMO-type transmitting-receiving environment is surveyed
Electricity testing device, including code stream contrast module and display module, described code stream contrast module is by original audio code
Stream and reception audio code stream compare by bit, by original video code stream with reception video code flow by bit
Bit comparison；Described display module shows described result of the comparison.
More specifically, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device wraps further
Include: audio, video data acquisition module, audio, video data be acquired, it is thus achieved that original audio code stream and
Original video code stream；Source code flow memory module, connects described audio, video data acquisition module, to connect
Receive and store described original audio code stream and described original video code stream；Audio, video data compression processes mould
Block, connects described audio, video data acquisition module, carries out original audio code stream and original video code stream
Analog-to-digital conversion, compressed encoding, output squeezing audio code stream and compressed video bit stream；Scrambling Multiplexing module,
Connect described audio, video data compression processing module, to the compression audio code stream received and compression video
Code stream scrambles respectively, to obtain scrambling audio code stream and scrambling video code flow respectively, to scrambling sound
Frequency code stream and scrambling video code flow are transmitted flowing TS packing, to obtain audio TS bag, video respectively
TS bag, and to audio TS bag, video TS bag, Entitlement Control Message ECM, Entitlement Management Message
EMM carries out multiplexing, it is thus achieved that the TS stream after multiplexing, described TS stream has the MPEG-2 of 188 bytes
Frame structure；Channel data coding module, connects described scrambling Multiplexing module, after the multiplexing received
TS stream carry out successively 1/2 code check Turbo coding, matrix sub-clustering spiral interweave Bit Interleave,
16QAM modulation, space time processing, OFDM modulation, group OFDM frame, digital pre-distortion process,
Data signal after output digital pre-distortion process, in described channel data coding module, 1/2 yard
At when the Turbo coding of rate, the Bit Interleave of matrix sub-clustering spiral intertexture, 16QAM modulation, sky
Managing and process for single channel, OFDM modulation, group OFDM frame, digital pre-distortion are processed as multichannel and process,
The Turbo coding of described 1/2 code check is for Error Correction of Coding；Digital Up Convert processing module, connects institute
Stating channel data coding module, the data signal after being processed by the digital pre-distortion received is converted into mould
Intend signal, the analog signal after conversion is carried out Frequency mixing processing to obtain the mould after having than described conversion
Intend the radiofrequency signal of the higher centre frequency of centre frequency of signal, and the radiofrequency signal of acquisition is carried out
Amplify and limit bandwidth；Multiple transmitting antennas, connect described Digital Up Convert processing module to receive warp
Cross the radiofrequency signal amplifying and limiting bandwidth to launch in ground digital television broadcast DVB-T channel
The DVB-T signal of MIMO-type；Multiple reception antennas, receive transmission in DVB-T channel
The DVB-T signal of MIMO-type, it is thus achieved that radiofrequency signal；Down-converted module, connects described many
Described radiofrequency signal, to receive described radiofrequency signal, is simulated down coversion with conversion by individual reception antenna
On intermediate frequency, signal is digitized by intermediate frequency, then carry out the signal after digitlization becoming under numeral
Frequently, the process in described Digital Down Convert processing module is that multichannel processes, to receive respectively from described
The radiofrequency signal of multiple reception antennas；Channel data decoder module, connects described down-converted module
With the signal after reception Digital Down Convert, and to the signal after the described Digital Down Convert received successively
Carry out solving OFDM frame, OFDM demodulation, 16QAM demodulation, the inverse ratio of matrix sub-clustering spiral intertexture
The special Turbo decoding interweaved with 1/2 code check, to obtain the Turbo of 1/2 code check decoded transmission stream
TS flows, described 16QAM demodulation, the anti-Bit Interleave of matrix sub-clustering spiral intertexture and 1/2 code check
Turbo is decoded as single channel and processes, and described solution OFDM frame, OFDM demodulation are that multichannel processes；Information source
Data decoder module, connects described channel data decoder module, the Turbo to described acquisition 1/2 code check
Decoded transport stream TS stream carries out demultiplexing, descrambles, decompression operation, receives audio frequency to obtain
Code stream and reception video code flow；Described code stream contrast module connects described source code flow memory module and institute
State information source data decoder module, original audio code stream and reception audio code stream are compared by bit, will
Original video code stream and receive video code flow and compare by bit, and export bit and compare be not inconsistent former
Beginning audio code stream and reception audio code stream, output bit compares the original video code stream and reception not being inconsistent
Video code flow；Described display module connects described code stream contrast module, to receive and to show bit ratio
The original audio code stream not relatively being inconsistent and receive audio code stream, receives and shows that bit compares be not inconsistent former
Beginning video code flow and reception video code flow, also compare the original audio code stream not being inconsistent and reception by bit
The each self-corresponding image of audio code stream carries out contrast display, the bit quantity not being inconsistent bit bit comparison
Carry out statistical analysis and show statistic analysis result；Monitoring module, connects described information source data decoding mould
Block, to monitor and to show that the Turbo decoded transport stream TS stream to described acquisition 1/2 code check is carried out
Demultiplexing, descrambling, the most normal mode of operation of each operation of decompression operation；Test environment sets
Put module, connect audio, video data compression processing module, scrambling Multiplexing module, channel data coding mould
Block, channel data decoder module and information source data decoder module, or press by remote control according to user
The test environment setting command that button sends is to revise audio, video data compression processing module, scrambling multiplexing mould
Operation in block, channel data coding module, channel data decoder module or information source data decoder module
Parameter；Wherein, the process in described Digital Up Convert processing module is that multichannel processes, the plurality of sky
Line receives the multiple-channel output after the multichannel process of described Digital Up Convert processing module, Jing Guofang respectively
The big radiofrequency signal with restriction bandwidth, the digital broadcast signal of described MIMO-type is in multiple continuous transmittings
Launch at multiple transmitting antennas in cycle, launch many in multiple continuous transmitting cycles
The correlation in time domain and spatial domain is there is between group signal；Wherein, described down-converted module includes number
Controlled oscillator mixing unit, described digital controlled oscillator mixing unit produces sine and cosine ripple sample value, and will
The signal after described digitlization in the sine and cosine ripple sample value produced and described down-converted module
It is multiplied, completes mixing, with the signal of the signal lower frequency after obtaining than described digitlization；Wherein,
Described compression audio code stream to receiving and the scrambling that carries out respectively of compressed video bit stream are specifically, make
Scramble respectively with the Control Word compression audio code stream to receiving and compressed video bit stream, CW
Being encrypted by business cipher key SK, the CW after encryption carries in ECM, and SK is by individual subscriber key
PDK encrypts, and the SK after encryption carries in EMM, and individual subscriber key PDK is stored
In the smart card of the user of payment, the most encrypted storage of individual subscriber key PDK, with
PDK is avoided directly to be read.
More specifically, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device wraps further
Include: in TS after described multiplexing stream, audio TS bag, video TS bag, Entitlement Control Message ECM,
Entitlement Management Message EMM has different PID Packet Identifier PID, and described PID is used to flow for TS
The identifier of middle different types of data bag distribution different value.
More specifically, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device wraps further
Include: described TS stream be made up of packet header and load, described packet header include a sync byte SYNC1 and
Three other bytes, described three other bytes are used for traffic identification, scramble and control information, described
Load includes the MPEG-2 data of 184 bytes, the tool of three other bytes in described TS stream packet header
Body is distributed as, 1 transmission error code indication bit position, and 1 clean data cell initiates indication bit position, and 1
Individual transmission priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bits
Position, 2 self adaptation districts control bit and 4 continuous counter bits.
More specifically, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device wraps further
Include: the TS stream after described multiplexing also includes the network information table NIT of business information SI, bouquet
Contingency table BAT or service information list SDT, for carrying electronic program guide (EPG) information.
Accompanying drawing explanation
Below with reference to accompanying drawing, embodiment of the present invention are described, wherein:
The multiple-input and multiple-output MIMO-type transmitting-receiving environmental testing that Fig. 1 illustrates according to an embodiment of the present invention
The block diagram of device.
Wherein, 1, code stream contrast module；2, display module.
Detailed description of the invention
Multiple-input and multiple-output MIMO-type to the present invention receives and dispatches environmental testing dress below with reference to accompanying drawings
The embodiment put is described in detail.
Fig. 1 illustrates the multiple-input and multiple-output MIMO-type transmitting-receiving environment illustrated according to an embodiment of the present invention
The block diagram of test device.Wherein multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device bag
Including, code stream contrast module 1 and display module 2, described code stream contrast module 1 is by original audio code stream
Compare by bit with receiving audio code stream, by original video code stream with reception video code flow by bit
Relatively；Described display module 2 shows described result of the comparison.Further, described transmitting-receiving environment is surveyed
Electricity testing device also includes, audio, video data acquisition module, is acquired audio, video data, it is thus achieved that original
Audio code stream and original video code stream；Source code flow memory module, connects described audio, video data and obtains
Module, to receive and to store described original audio code stream and described original video code stream；Audio, video data
Compression processing module, connects described audio, video data acquisition module, to original audio code stream with original regard
Frequency code stream carries out analog-to-digital conversion, compressed encoding, output squeezing audio code stream and compressed video bit stream；Add
Disturb Multiplexing module, connect described audio, video data compression processing module, to the compression audio code received
Stream and compressed video bit stream scramble respectively, to obtain scrambling audio code stream and scrambling video codes respectively
Stream, is transmitted flowing TS packing, to obtain sound respectively to scrambling audio code stream and scrambling video code flow
Frequently TS bag, video TS bag, and to audio TS bag, video TS bag, Entitlement Control Message ECM,
Entitlement Management Message EMM carries out multiplexing, it is thus achieved that the TS stream after multiplexing, described TS stream has 188
The MPEG-2 frame structure of byte；Channel data coding module, connects described scrambling Multiplexing module, right
TS stream after the multiplexing received carries out the Turbo coding of 1/2 code check successively, matrix sub-clustering spiral is handed over
The Bit Interleave knitted, 16QAM modulation, space time processing, OFDM modulation, group OFDM frame, number
Word pre-distortion, the data signal after output digital pre-distortion process, at described channel data coding
In module, the Turbo coding of 1/2 code check, the Bit Interleave of matrix sub-clustering spiral intertexture, 16QAM
Modulation, space time processing are that single channel processes, at OFDM modulation, group OFDM frame, digital pre-distortion
Managing and process for multichannel, the Turbo coding of described 1/2 code check is for Error Correction of Coding；At Digital Up Convert
Reason module, connects described channel data coding module, the number after being processed by the digital pre-distortion received
Word signal is converted into analog signal, the analog signal after conversion carries out Frequency mixing processing and has ratio to obtain
The radiofrequency signal of the higher centre frequency of centre frequency of the analog signal after described conversion, and will obtain
Radiofrequency signal be amplified and limit bandwidth；Multiple transmitting antennas, connect at described Digital Up Convert
Reason module is to receive through amplifying and limiting the radiofrequency signal of bandwidth with at ground digital television broadcast
DVB-T channel is launched the DVB-T signal of MIMO-type；Multiple reception antennas, receive at DVB-T
The DVB-T signal of the MIMO-type of transmission in channel, it is thus achieved that radiofrequency signal；Down-converted module,
Connect the plurality of reception antenna to receive described radiofrequency signal, under described radiofrequency signal being simulated
Signal, to be transformed on intermediate frequency, is digitized on intermediate frequency by frequency conversion, then enters the signal after digitlization
Row number down coversion, the process in described Digital Down Convert processing module is that multichannel processes, to connect respectively
Receive the radiofrequency signal from the plurality of reception antenna；Channel data decoder module, connects described lower change
Frequently processing module is to receive the signal after Digital Down Convert, and to the described Digital Down Convert received after
Signal successively carry out solve OFDM frame, OFDM demodulation, 16QAM demodulation, matrix sub-clustering spiral
The anti-Bit Interleave interweaved and the Turbo decoding of 1/2 code check, to obtain the Turbo decoding of 1/2 code check
After transport stream TS stream, described 16QAM demodulation, matrix sub-clustering spiral interweave anti-Bit Interleave
Being decoded as single channel with the Turbo of 1/2 code check to process, described solution OFDM frame, OFDM demodulation are many
Road processes；Information source data decoder module, connects described channel data decoder module, to described acquisition 1/2
The Turbo decoded transport stream TS stream of code check carries out demultiplexing, descrambles, decompression operation, with
Obtain and receive audio code stream and receive video code flow；Described code stream contrast module 1 connects described source code
Stream memory module and described information source data decoder module, by original audio code stream and receive audio code stream by
Bit compares, and original video code stream and reception video code flow is compared by bit, and exports bit
The original audio code stream that bit comparison is not inconsistent and receive audio code stream, output bit compares be not inconsistent original
Video code flow and reception video code flow；Described display module 2 connects described code stream contrast module 1, with
Receive and show that bit compares the original audio code stream not being inconsistent and receives audio code stream, receive and show
Bit compares the original video code stream that is not inconsistent and receives video code flow, is also compared by bit and is not inconsistent
Original audio code stream and the reception each self-corresponding image of audio code stream carry out contrast display, to bit ratio
The bit quantity not relatively being inconsistent carries out statistical analysis and shows statistic analysis result；Monitoring module, connects
Described information source data decoder module, to monitor and to show that the Turbo to described acquisition 1/2 code check decodes
After transport stream TS stream carry out demultiplexing, descramble, each operation of decompression operation the most normal
Mode of operation；Test environment arranges module, connects audio, video data compression processing module, scrambling multiplexing
Module, channel data coding module, channel data decoder module and information source data decoder module, according to
The test environment setting command that user is sent by remote control or button revises audio, video data pressure
Contracting processing module, scrambling Multiplexing module, channel data coding module, channel data decoder module or letter
Operating parameter in source data decoder module；Wherein, the process in described Digital Up Convert processing module
Processing for multichannel, the plurality of antenna receives the multichannel of described Digital Up Convert processing module respectively and processes
After multiple-channel output, through amplification and limit bandwidth radiofrequency signal, the numeral of described MIMO-type
Broadcast singal is launched in multiple continuous transmitting cycles at multiple transmitting antennas, multiple continuously
The correlation in time domain and spatial domain is there is between the many groups signal launched in the transmitting cycle；Wherein, institute
Stating down-converted module and include digital controlled oscillator mixing unit, described digital controlled oscillator mixing unit produces
Raw sine and cosine ripple sample value, and by the sine and cosine ripple sample value produced and described down-converted module
Described digitlization after signal multiplication, complete mixing, with the signal after obtaining than described digitlization more
Low-frequency signal；Wherein, described compression audio code stream to receiving and compressed video bit stream are respectively
The scrambling carried out is specifically, use the Control Word compression audio code stream to receiving and compression video
Code stream scrambles respectively, and CW is encrypted by business cipher key SK, and the CW after encryption carries at ECM
In, SK is encrypted by individual subscriber key PDK, and the SK after encryption carries in EMM, user
Personal key PDK is by the smart card storing the user paid the fees, and individual subscriber key PDK exists
Encrypted storage in smart card, to avoid PDK directly to be read.
Wherein, Turbo code has an important feature to be that its decoding is complex, wants than conventional convolutional code
Complicated many, this complexity is not only in that it decodes the process of iteration to be used, and the algorithm used
Itself is the most more complicated, these algorithms it is crucial that not only want every bit can be decoded, and
Also to provide, with this decoding, the reliability information that every bit translates, have these information, iteration ability
Go on.Two simple component codes are passed through pseudo random interleaver parallel cascade by Turbo code dexterously
Construct the long code with pseudo-random characteristics, and by two soft enter/soft go out between (SISO) decoder
Carry out successive ignition and achieve pseudorandom decoding.His performance considerably beyond other coded system,
Obtain paying close attention to widely and developing, and current coding theory and research method have been created far-reaching
Impact.
Wherein, Testing environment (test environment), refer to test run software thereon and
The description of hardware environment, and any other software mutual with tested software, including driving and stake.
Test environment=software+hardware+network+data preparation+testing tool.Test environment has referred to
The general name of computer hardware, software, the network equipment, historical data necessary to Experience of Software Testing Work.
Certainly, stable and controlled test environment, tester can be made to take less time the completeest
Become the execution of test case, spend additional time without the maintenance for test case, test process,
And can ensure that each submitted defect can at any time be reappeared accurately.Simply
Say, through good planning and the test environment of management, the variation that can reduce environment as far as possible is right
The adverse effect of test job, it is possible to the efficiency of test job and the raising of quality are produced positive
Effect.
Wherein, modulation (modulation) is exactly that the information to signal source carries out process and is added on carrier wave,
So that it becomes be suitable for the process of the form of transmission, it is simply that make the skill that carrier wave changes with signal
Art.In general, the information (also referred to as information source) of signal source is relatively low containing DC component and frequency
Frequency component, referred to as baseband signal.Baseband signal tends not to as transmission signal, it is therefore necessary to
Baseband signal is changed into the highest signal of frequency for a relative baseband frequency to be suitable for channel
Transmission.This signal is called modulated signal, and baseband signal is called modulated signal.Modulation is by changing
Become amplitude, phase place or the frequency of the high frequency carrier i.e. carrier signal of message so that it is along with baseband signal
The change of amplitude and changing realizes.Demodulation be then baseband signal is extracted from carrier wave with
The process that the most predetermined recipient's (also referred to as stay of two nights) processes and understands.
Wherein, conditional access system (CAS) is the core technology carrying out pay TV, understands him
Operating mechanism, the success of paying television services is carried out non-the normally off by the operation and maintenance grasping him
Key.The composition of CAS includes: Subscriber Management System SMS, business information generate system SIG, joint
Mesh management PMS/SI editing system, program scheduling process EIS, user authorization management system SAS,
Condition reception CA etc..Mainly there are two major parts: one piece of SMS being to manage user, one piece is management joint
Purpose CA.CA is broadly divided into two large divisions: one is signal scrambling part, and it is random by one
Random code produced by code generator (referred to as Control Word) controls the scrambler scrambling to signal；
Two is encryption part, and the signal of scrambling to be made successfully descrambles at receiving terminal, receiving terminal also it is necessary to have
Descrambler being controlled with the scrambling living control word of end, so, the CW of front end is sent to
Receiving terminal, if directly transmission can be easy to be intercepted and captured by hacker and make CAS ineffective, to this end, want
CW is encrypted transmission, and this encryption is a kind of multi-layer security mechanism, thus increases CW and transmit
Security, directly to CW encryption ground floor produced by ciphertext be referred to as Entitlement Control Message
ECM, is transmitted together with the code stream of scrambling by multiplexer, ECM possibly together with the time, program price,
The information such as program authorization control, therefore ECM is the management information towards program.To CW encryption
Key is referred to as working key SK, and SK is the most again moon key, monthly changes once, often changes a SK,
All users will be authorized by system again.Second layer encryption is with referred to as program key PDK
Being encrypted SK, produced ciphertext and the authorized order obtained from SMS are generated by SAS
Authorization message composition Entitlement Management Message EMM, EMM possibly together with intelligent card numbers, authorize the time,
The authorized user messages such as authorization mechanism.If these information spinners complete the mandate to user, therefore EMM
Being user oriented management information, when user is seen, sees that what channel is awarded by EMM
Weighing, he transmits together with scrambling code stream also by multiplexer, and it is most basic that the above constitutes CA
Encryption system.
It addition, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device farther includes:
In TS stream after described multiplexing, audio TS bag, video TS bag, Entitlement Control Message ECM, award
Power management information EMM has different PID Packet Identifier PID, during described PID is used to flow for TS
The identifier of different types of data bag distribution different value.
It addition, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device farther includes: institute
State TS stream to be made up of packet header and load, described packet header include a sync byte SYNC1 and three its
His byte, described three other bytes for traffic identification, scramble and control information, described load bag
Include the MPEG-2 data of 184 bytes, the concrete distribution of three other bytes in described TS stream packet header
For, 1 transmission error code indication bit position, 1 clean data cell initiates indication bit position, 1 transmission
Priority bit position, 13 bag identifier PID bits, 2 transmission scrambling control bits positions, 2
Individual self adaptation district controls bit and 4 continuous counter bits.
It addition, described multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device farther includes: institute
State in the stream of the TS after multiplexing and also include the network information table NIT of business information SI, BAT bouquet association table
BAT or service information list SDT, for carrying electronic program guide (EPG) information.
Wherein, EPG is the english abbreviation of Electronic Program Guide, and the meaning is electronic programming
Menu.EPG interface typically all provides all kinds of menu, button, link etc. are available for user to select
The assembly clicked directly on during program；Can also comprise all kinds of for moving that user browses on the interface of EPG
State or the content of multimedia of static state.The Main Function of EPG is exactly the menu that user utilizes EPG to provide,
The multicast channel oneself liked can be selected；The video frequency program that program request oneself is liked；Online performance oneself
The song liked；Search the various information that IPTV provides, including life information, entertainment information, religion
Educate information, sport information etc.；User is used as the menu of EPG offer to order what oneself was liked
Program；Even can pay water rate, the electricity charge by menu that EPG provides, carry out the friendship of ecommerce
Easily etc..User can also utilize EPG menu to check the additional information of program, such as, be situated between programme content
Continue, performer and the introduction etc. of director.Simultaneously by the parental control function provided in EPG menu, family
Some program can be any limitation as by length, not to the open all of viewing authority of child.
Use the multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device of the present invention, improve existing
The flexibility of multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device in technology, enabling according to
Code stream comparison means is in real time to receiving code stream and sending the various comparisons of code stream, adaptively selected optimum
Reception environment and send environment, thus contribute to local operator and carry out product customization, meet TV
The requirement that spectators are the highest to TV audio, video data.
Although it is understood that the present invention discloses as above with preferred embodiment, but above-mentioned enforcement
Example is not limited to the present invention.For any those of ordinary skill in the art, without departing from
Under technical solution of the present invention ambit, all may utilize the technology contents of the disclosure above to the technology of the present invention
Scheme makes many possible variations and modification, or is revised as the Equivalent embodiments of equivalent variations.Therefore,
Every content without departing from technical solution of the present invention, the technical spirit of the foundation present invention is to above example
Any simple modification, equivalent variations and the modification done, all still falls within technical solution of the present invention protection
In the range of.
Claims (1)
1. a multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device, it is characterised in that institute
State test device to include:
Code stream contrast module and display module, described code stream contrast module is by original audio code stream and reception
Audio code stream compares by bit, original video code stream and reception video code flow is compared by bit；
Described display module shows described result of the comparison；
Also include:
Audio, video data acquisition module, is acquired audio, video data, it is thus achieved that original audio code stream and
Original video code stream；
Source code flow memory module, connects described audio, video data acquisition module, to receive and to store institute
State original audio code stream and described original video code stream；
Audio, video data compression processing module, connects described audio, video data acquisition module, to original sound
Frequency code stream and original video code stream carry out analog-to-digital conversion, compressed encoding, output squeezing audio code stream and pressure
Contracting video code flow；
Scrambling Multiplexing module, connects described audio, video data compression processing module, to the compression received
Audio code stream and compressed video bit stream scramble respectively, to obtain scrambling audio code stream and scrambling respectively
Video code flow, is transmitted flowing TS packing to scrambling audio code stream and scrambling video code flow, with respectively
Obtain audio TS bag, video TS bag, and to audio TS bag, video TS bag, authorization control letter
Breath ECM, Entitlement Management Message EMM carry out multiplexing, it is thus achieved that the TS stream after multiplexing, described TS
Stream has the MPEG-2 frame structure of 188 bytes；
Channel data coding module, connects described scrambling Multiplexing module, to the TS after the multiplexing received
Stream carries out the Turbo coding of 1/2 code check, the Bit Interleave of matrix sub-clustering spiral intertexture, 16QAM successively
Modulation, space time processing, OFDM modulation, group OFDM frame, digital pre-distortion process, and export number
Data signal after word pre-distortion, in described channel data coding module, the Turbo of 1/2 code check
Bit Interleave, 16QAM that coding, matrix sub-clustering spiral interweave modulate, space time processing is at single channel
Reason, OFDM modulates, group OFDM frame, digital pre-distortion are processed as multichannel and process, described 1/2 yard
The Turbo coding of rate is for Error Correction of Coding；
Digital Up Convert processing module, connects described channel data coding module, the numeral that will receive
Data signal after pre-distortion is converted into analog signal, is mixed the analog signal after conversion
Process the higher centre frequency of centre frequency of the analog signal after having than described conversion with acquisition
Radiofrequency signal, and the radiofrequency signal of acquisition is amplified and limits bandwidth；
Multiple transmitting antennas, connect described Digital Up Convert processing module to receive through amplifying and limiting
The radiofrequency signal of bandwidth is to launch MIMO-type in ground digital television broadcast DVB-T channel
DVB-T signal；
Multiple reception antennas, receive the DVB-T signal of the MIMO-type of transmission in DVB-T channel,
Obtain radiofrequency signal；
Down-converted module, connects the plurality of reception antenna to receive described radiofrequency signal, by institute
State radiofrequency signal be simulated down coversion to be transformed on intermediate frequency, on intermediate frequency to signal digitize, so
Afterwards the signal after digitlization is carried out Digital Down Convert, the process in described Digital Down Convert processing module
It is that multichannel processes, to receive the radiofrequency signal from the plurality of reception antenna respectively；
Channel data decoder module, connects described down-converted module to receive after Digital Down Convert
Signal, and to the signal after the described Digital Down Convert received successively carry out solve OFDM frame,
OFDM demodulation, 16QAM demodulation, the anti-Bit Interleave of matrix sub-clustering spiral intertexture and 1/2 code check
Turbo decoding, to obtain the Turbo of 1/2 code check decoded transport stream TS stream, described 16QAM
The Turbo of demodulation, the anti-Bit Interleave that matrix sub-clustering spiral interweaves and 1/2 code check is decoded as at single channel
Reason, described solution OFDM frame, OFDM demodulation are that multichannel processes；
Information source data decoder module, connects described channel data decoder module, to described acquisition 1/2 yard
The Turbo decoded transport stream TS stream of rate carries out demultiplexing, descrambles, decompression operation, to obtain
Audio code stream must be received and receive video code flow；
Described code stream contrast module connects described source code flow memory module and the decoding of described information source data
Module, by original audio code stream with receive audio code stream and compare by bit, by original video code stream and
Receive video code flow to compare by bit, and export bit and compare the original audio code stream that is not inconsistent and connect
Receiving audio code stream, output bit compares the original video code stream not being inconsistent and receives video code flow；
Described display module connects described code stream contrast module, is not inconsistent to receive and to show that bit compares
Original audio code stream and receive audio code stream, receive and show that bit compares the original video not being inconsistent
Code stream and reception video code flow, also compare bit the original audio code stream not being inconsistent and receive audio code
Flowing each self-corresponding image and carry out contrast display, the bit quantity not being inconsistent bit bit comparison is united
Meter is analyzed and shows statistic analysis result；
Monitoring module, connects described information source data decoder module, to monitor and to show described acquisition 1/2
The Turbo decoded transport stream TS stream of code check carries out demultiplexing, descrambles, decompression operation each
The most normal mode of operation of individual operation；
Test environment arranges module, connect audio, video data compression processing module, scrambling Multiplexing module,
Channel data coding module, channel data decoder module and information source data decoder module, lead to according to user
Cross remote control or test environment setting command that button sends processes to revise audio, video data compression
Module, scrambling Multiplexing module, channel data coding module, channel data decoder module or information source data
Operating parameter in decoder module；
Wherein, the process in described Digital Up Convert processing module is that multichannel processes, the plurality of antenna
Receive the multiple-channel output after the multichannel process of described Digital Up Convert processing module, process amplification respectively
With the radiofrequency signal of restriction bandwidth, the digital broadcast signal of described MIMO-type is in multiple continuous transmitting weeks
Launch at multiple transmitting antennas in phase, many groups launched in multiple continuous transmitting cycles
The correlation in time domain and spatial domain is there is between signal；
Wherein, described down-converted module includes digital controlled oscillator mixing unit, and described numerical control is vibrated
Device mixing unit produces sine and cosine ripple sample value, and by the sine and cosine ripple sample value produced and described lower change
Frequently the signal multiplication after the described digitlization in processing module, completes mixing, to obtain than described numeral
The signal of the signal lower frequency after change；
Wherein, described compression audio code stream to receiving and the scrambling that carries out respectively of compressed video bit stream
Specifically, use the Control Word compression audio code stream to receiving and compressed video bit stream to enter respectively
Row scrambling, CW is encrypted by business cipher key SK, and the CW after encryption carries in ECM, SK by
Individual subscriber key PDK encrypts, and the SK after encryption carries in EMM, individual subscriber key PDK
By in the smart card storing the user paid the fees, individual subscriber key PDK is added within a smart card
Close storage, to avoid PDK directly to be read；
After described multiplexing TS stream in, audio TS bag, video TS bag, Entitlement Control Message ECM,
Entitlement Management Message EMM has different PID Packet Identifier PID, and described PID is used to flow for TS
The identifier of middle different types of data bag distribution different value；
Described TS stream be made up of packet header and load, described packet header include a sync byte SYNC1 and
Three other bytes, described three other bytes are used for traffic identification, scramble and control information, described
Load includes the MPEG-2 data of 184 bytes, the tool of three other bytes in described TS stream packet header
Body is distributed as, 1 transmission error code indication bit position, and 1 clean data cell initiates indication bit position, and 1
Individual transmission priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bits
Position, 2 self adaptation districts control bit and 4 continuous counter bits；
TS stream after described multiplexing also includes the network information table NIT of business information SI, bouquet
Contingency table BAT or service information list SDT, for carrying electronic program guide (EPG) information.
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| CN201510650838.XA CN105141977B (en) | 2013-06-08 | 2013-06-08 | Multiple-input and multiple-output MIMO-type transmitting-receiving environment measuring device |
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| CN105611317A (en) * | 2016-01-18 | 2016-05-25 | 北京流金岁月文化传播股份有限公司 | Video-audio transcoding device and method capable of supporting audio unvarnished transmission |
| CN105611312A (en) * | 2016-02-05 | 2016-05-25 | 丁锋 | Cinema live broadcasting monitoring management system |
| CN109076033B (en) * | 2016-03-31 | 2021-01-29 | 华为技术有限公司 | Radio system and decoding device for distributed compression |
| CN107453883A (en) * | 2016-05-31 | 2017-12-08 | 北京中天鼎盛视讯科技有限公司 | A kind of wireless supervisory control system and method |
| CN106791615A (en) * | 2016-12-02 | 2017-05-31 | 深圳市唯科视科技有限公司 | A kind of unmanned plane DVB T figures pass channel automatic selective system and system of selection |
| CN115794569A (en) * | 2021-09-09 | 2023-03-14 | 华为技术有限公司 | High-speed serial link testing method and device |
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| GB2449470B (en) * | 2007-05-23 | 2011-06-29 | British Broadcasting Corp | OFDM-MIMO radio frequency transmission system |
| CN100589586C (en) * | 2008-04-09 | 2010-02-10 | 北京航空航天大学 | A kind of digital television broadcasting acceptance test method and device thereof |
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