CN104378650A - Digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with low error rate - Google Patents
Digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with low error rate Download PDFInfo
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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]
- H04N21/20—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
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/26613—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing keys in general
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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
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
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- Radio Relay Systems (AREA)
Abstract
The invention relates to a digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with a low error rate. The operating frequency of the system is a decimetric television frequency band ranging from 400 MHz to 800 MHz. The whole system is composed of a base station subsystem, a relay subsystem and a user-side subsystem. The base station subsystem comprises a broadband base station, an adjacent-frequency multiplex synthesis base station, an optical fiber base station, a bidirectional multimedia base station and a multiple-definition base station. The relay subsystem comprises a repeater relay station and a forward relay station. The user-side subsystem is composed of a user antenna, a digital set-top box, a digital television receiver and the like. The digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system is low in manufacturing cost and capable of achieving transmission of multi-channel high-quality digital programs in a wireless mode and conducting dynamic pseudorandom descrambling and multiple secret key encryption and decryption on digital television signals to achieve charge management; as a result, a feasible, economical and practical means is provided for achieving modern multi-channel television coverage and multimedia coverage in suburban areas and rural areas, and mobile digital television transmission can also be achieved.
Description
Technical field
The invention belongs to a kind of Multichannel TV transmission system, particularly a kind of low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system.
Background technology
Existing Multichannel TV transmission system has: cable television delivery systems, MMDS multi path microwaves television transmission system (MMDS) etc.Wherein cable TV adjacent frequency transmission system transmission way is many, laser propagation effect is good, shortcoming needs wiring, cost is high, installation workload is large, against natural and artificial destruction ability, operation maintenance workload are large, the inadaptable multi-channel television covering problem solving city suburbs and the such scattered settlement resident in rural area.MMDS multichannel microwave television system adopts wireless coverage, and be applicable to scattered settlement region, shortcoming there is upper and lower converter noise, affects rating quality, under the condition of television digitization, affects even more serious; In addition relative bandwidth is little, and adjacent frequency isolation is not high, and wavelength is short, tree declines, rain declines, and problem is serious; MMDS multi path microwaves television transmission system, can not realize high-quality and cover.
Summary of the invention
The object of the present invention is to provide a kind of low cost, high-quality multi-path adjacent frequency wireless digital TV transmission system, it transmits multichannel high-quality digital program by wireless mode, dynamic pseudo-random descrambling and multiple key encryption and decryption are adopted to digital television signal, realize toll administration, to cover and multimedia covers for solving city suburbs and rural area modern times multi-channel television, practicable economical and practical means are provided, also can provide mobile type digital television transmission.
Technical scheme of the present invention is: a kind of low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system, and it is made up of base sub-system, relaying subsystem, user side subsystem three parts; Described base sub-system comprises broadband type base station, adjacent frequency multiplex (MUX) synthesis type base station, optical-fiber type base station, two-way multimedia base station, multiple definition base station; The each channel in described broadband type base station is made up of MPEG-2 code stream machine, the compatible group's multiplexing machine of single channel multichannel, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, digital decimeter wave adjacent frequency mixer channel, High Linear numeral MUDS wideband transmitter, broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to digital decimeter wave adjacent frequency mixer channel respectively and carries out adjacent frequency mixing, and its mixed signal is amplified through High Linear numeral MUDS wideband transmitter, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to High Linear numeral MUDS transmitter respectively and amplifies and export on numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer Zhong He road, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to High Linear numeral MUDS transmitter respectively and amplifies and export on numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer Zhong He road, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Described relay system comprises directly puts relay station and forward relay station; Described user side is made up of user antenna, top box of digital machine, digital television receiver etc.; Described relay station of directly putting is divided into and unidirectionally directly puts relay station and two-wayly directly put relay station, described forward relay station is divided into unidirectional forward relay station and two-wayly directly puts relay station.
Further, each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to High Linear numeral MUDS transmitter respectively and amplifies and export on numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer Zhong He road, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit.
Further, described High Linear numeral MUDS transmitter comprises a power amplifier, this power amplifier adopts negative front feedback power to amplify, pre-distorted power amplifies and high-power rollback three schemes improve the linearity, wherein high-power rollback type power amplifier is by low noise amplification unit, 3dB broadband ceramic coupler and 50 Ω build-out resistors, the modular promotion High Linear amplifying unit that two performances are consistent, the final stage High Linear power amplification unit that two performances are consistent, 3dB wideband high-power ceramic coupler, high-power 50 Ω build-out resistors and standing wave detect isolator composition, radiofrequency signal is input to low noise amplification unit, enter 3dB ceramic coupler to carry out symmetry and be shunted to two-way, each road is carried out modular respectively and is promoted High Linear amplifying unit, the amplification of final stage High Linear power amplification unit, carry out conjunction road by 3dB wideband high-power ceramic coupler and increase power, detect isolator by standing wave and eliminate reflected wave output.
Further, described optical-fiber type base station comprises the home base stations be connected with HFC fiber-coaxial net, the multiple telepoint base stations be connected with HFC fiber-coaxial net by DVB demodulation modulating unit; Described home base stations and telepoint base station can be all broadband type base station or adjacent frequency multiplex (MUX) synthesis type base station; Described DVB demodulation modulating unit comprises DVB-C, DVB-T two kinds of demodulation modulating units, described DVB-C demodulation modulating unit comprises DVB-C code stream receiver and QAM modulation device, the TS that this DVB-C code stream receiver receives from the MPEG-2 of HFC fiber-coaxial net flows, this TS stream is carried out QAM modulation by QAM modulation device, and the signal after modulation inputs to telepoint base station; Described DVB-T demodulation modulating unit comprises DVB-T code stream receiver and COFDM modulator, the TS that this DVB-T code stream receiver receives from the MPEG-2 of HFC fiber-coaxial net flows, this TS stream is carried out COFDM modulation by COFDM modulator, and the signal after modulation inputs to telepoint base station.
Further, described two-way multimedia base station comprises multiple DVB digital television channel, multiple DVB data broadcast passage, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, nets equipment, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and the broadband bipolar plate transmitting antenna of networking with broadband INT; Described DVB digital television channel comprises DVB-C digital television channel and DVB-T digital television channel; Described DVB data broadcast passage comprises DVB-C data broadcast passage and DVB-T data broadcast passage; Each DVB digital television channel and each DVB data broadcast passage input to numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer by Digital Up Convert channel plate, High Linear numeral MUDS transmitter respectively, and broadband bipolar plate transmitting antenna is connected with this numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer; The described equipment of networking of netting with broadband INT comprises DVB gateway, down going channel, data feedback channel, CA system, DVB modulator, High Linear numeral MUDS transmitter, CDMA demodulating unit, CDMA uplink receiving unit and reception antenna, down going channel and data feedback channel to be netted with broadband INT by DVB gateway and are connected, and realize IP packet and TS flows and the conversion of CDMA packet; Described down going channel, CA system, DVB modulator, High Linear numeral MUDS transmitter is connected to numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer successively; Described reception antenna, CDMA uplink receiving unit, CDMA demodulating unit are connected to data feedback channel successively.
The invention provides electronic card transfer method and the system of a kind of combining geographic location information and authorization information, utilize electronic business card delivery server by the geographical location information of each mobile client, the simple and clear identity information of authorization information and user collects, making to call request user can according to above-mentioned Information Selection in predetermined distance range and the consistent one or more users of authorization information carry out the transmission of electronic business card, provide convenience for people transmit electronic business card, compared to prior art, simple to operate and correctness and the fail safe of electronic business card content can be guaranteed.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but these embodiments must not be used for explaining limiting the scope of the invention.
Embodiment 1:
Present system operating frequency is 400-800MHZ decimever television frequency range; Total system is made up of base sub-system, relaying subsystem, user side subsystem three parts; Base sub-system comprises broadband type base station, adjacent frequency multiplex (MUX) synthesis type base station, optical-fiber type base station, two-way multimedia base station, multiple definition base station; Relay system comprises directly puts relay station and forward relay station; User side is made up of user antenna, top box of digital machine, digital television receiver etc.
Described relay station of directly putting is divided into and unidirectionally directly puts relay station and two-wayly directly put relay station, described forward relay station is divided into unidirectional forward relay station and two-wayly directly puts relay station; The each channel in described broadband type base station is made up of MPEG-2 code stream machine, the compatible group's multiplexing machine of single channel multichannel, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, digital decimeter wave adjacent frequency mixer channel, High Linear numeral MUDS wideband transmitter, broadband bipolar plate transmitting antenna.
Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to digital decimeter wave adjacent frequency mixer channel respectively and carries out adjacent frequency mixing, and its mixed signal is amplified through High Linear numeral MUDS wideband transmitter, is gone out by broadband bipolar plate transmission antennas transmit; Described QAM intermediate frequency modulator, the general 64QAM of employing modulates, and QAM modulation belongs to DVB-C standard, is convenient to unify Set Top Box or digital television receiver standard with wired network, and plays the advantage of low cost.For city suburbs and vast rural area, mainly based on vegetative coverage, multi-path jamming is very little.User's reception antenna of the present invention adopts little radar reflection surface antenna, effectively can eliminate multi-path jamming, and the present invention is by actual test widely: city suburbs and rural area can adopt DVB-C standard to carry out wireless coverage completely.
COFDM belongs to DVB-T standard, effectively can eliminate multi-path jamming, is applicable to the environment of reception of Mobile Digital TV environment and urban architecture compact district multi-path jamming.The present invention adopts DVB-C and DVB-T standard mixed transport, and object is in economical and practical mode, and extensively adapt to multiple reception environment, the present invention also can adopt DVB-S to transmit, but the DVB-S availability of frequency spectrum is low, therefore does not adopt.
Described Digital Up Convert channel plate, the digital intermediate frequency signal after mainly QA, COFDM being modulated upconverts to analog television channels.China's analog television channels is 8MHZ bandwidth, 64QAM modulation after bandwidth be 6.6-7.0Mb/s bandwidth, can transmit in analog channel completely, Digital Up Convert channel plate is different from simulation up-conversion channel plate, it requires that bit error rate is very low with the modulation error rate, require very low phase noise, High Linear low noise amplification is high with very high inband flatness for this reason.Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider, medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Pass through technique scheme, Digital Up Convert channel plate is when output level is 80-110dBuv, its bit error rate BER reaches 1 × 10-9, (MER value is larger for modulation error rate MER >=32dB, represent that actual error code is less), digital intermediate frequency signal after modulation upconverts to analog television channels, and this Digital Up Convert channel plate can be used for all kinds base station below.
Numeral decimeter wave adjacent frequency mixer channel adopts adjacent frequency isolation to reach the adjacent frequency mixer channel of more than 30dB, to reduce mutual interference.The signal that adjacent frequency mixer channel exports, enter digital High Linear MUDS wideband transmitter and carry out power amplification, for reducing bit error rate and the modulation error rate, transmitter of the present invention will accomplish the noise factor≤5.0dB amplified, the linearity is high, and radio frequency power output is large, when linearity 6 carrier wave is equidistantly 8MHZ, it hands over Intermodulation Interference≤-45dBC, in this case radio frequency power output >=5W.
Described High Linear numeral MUDS transmitter comprises a power amplifier, this power amplifier adopts negative front feedback power amplification, pre-distorted power amplifies and high-power rollback three schemes improve the linearity, wherein high-power rollback type power amplifier is by low noise amplification unit, 3dB broadband ceramic coupler and 50 Ω build-out resistors, the modular promotion High Linear amplifying unit that two performances are consistent, the final stage High Linear power amplification unit that two performances are consistent, 3dB wideband high-power ceramic coupler, high-power 50 Ω build-out resistors and standing wave detect isolator composition; Radiofrequency signal is input to low noise amplification unit, enter 3dB ceramic coupler to carry out symmetry and be shunted to two-way, each road is carried out modular respectively and is promoted High Linear amplifying unit, the amplification of final stage High Linear power amplification unit, carry out conjunction road by 3dB wideband high-power ceramic coupler and increase power, detect isolator by standing wave and eliminate reflected wave output; Amplify because amplifying unit has all carried out back-off High Linear, adopt broadband 3dB ceramic coupler in addition.This power amplifier linearity is high, noise factor is low, work strip is wide.This power amplifier also adapts to for following adjacent frequency multiplex (MUX) synthesis type base station and relay station as power amplification core component.
Signal is input to broadband bipolar plate transmitting antenna by low-loss feedback pipe coaxial cable and launches by transmitter output.In order to ensure broadband, bipolar plate oscillator wants corner cut, makes the electromagnetic wave of different wave length all have 1/4 corresponding λ harmonic oscillator, to reach the object of spread bandwidth.
Each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Each passage High Linear numeral MUDS transmitter, makes the transmitting power of each passage increase, is beneficial to transmit farther distance.Noise factor≤the 5.0dB of High Linear numeral MUDS transmitter, during power output >=20W, Intermodulation Interference≤-45dBC is handed in 7MHZ bandwidth, under herein means mark, ensure its bit error rate BER≤10-7, modulation error rate MER >=30dB, the essential structure of High Linear numeral MUDS transmitter is identical with broadband type transmitter, its core component power amplifier adopts negative front feedback power to amplify, and pre-distorted power amplifies and high-power rollback power amplification three schemes improve the linearity, reduce the noise of amplification.
Described optical-fiber type base station comprises the home base stations be connected with HFC fiber-coaxial net, the multiple telepoint base stations be connected with HFC fiber-coaxial net by DVB demodulation modulating unit; Described home base stations and telepoint base station can be all broadband type base station or adjacent frequency multiplex (MUX) synthesis type base station; Described DVB demodulation modulating unit comprises DVB-C, DVB-T two kinds of demodulation modulating units, described DVB-C demodulation modulating unit comprises DVB-C code stream receiver and QAM modulation device, the TS that this DVB-C code stream receiver receives from the MPEG-2 of HFC fiber-coaxial net flows, this TS stream is carried out QAM modulation by QAM modulation device, and the signal after modulation inputs to telepoint base station; Described DVB-T demodulation modulating unit comprises DVB-T code stream receiver and COFDM modulator, the TS that this DVB-T code stream receiver receives from the MPEG-2 of HFC fiber-coaxial net flows, this TS stream is carried out COFDM modulation by COFDM modulator, and the signal after modulation inputs to telepoint base station; Why the present invention will carry out this process, is to utilize the error code correction function of DVB code stream receiver to reduce the error rate in transmitting.Telepoint base station can be single channel adjacent frequency multiplex's synthesis type base station, also can be wide bandwidth base station.
Described two-way multimedia base station comprises multiple DVB digital television channel, multiple DVB data broadcast passage, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, nets equipment, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and the broadband bipolar plate transmitting antenna of networking with broadband INT; Described DVB digital television channel comprises DVB-C digital television channel and DVB-T digital television channel; Described DVB data broadcast passage comprises DVB-C data broadcast passage and DVB-T data broadcast passage; Each DVB digital television channel and each DVB data broadcast passage input to numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer by Digital Up Convert channel plate, High Linear numeral MUDS transmitter respectively, and broadband bipolar plate transmitting antenna is connected with this numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer; The described equipment of networking of netting with broadband INT comprises DVB gateway, down going channel, data feedback channel, CA system, DVB modulator, High Linear numeral MUDS transmitter, CDMA demodulating unit, CDMA uplink receiving unit and reception antenna, down going channel and data feedback channel to be netted with broadband INT by DVB gateway and are connected, and realize IP packet and TS flows and the conversion of CDMA packet; Described down going channel, CA system, DVB modulator, High Linear numeral MUDS transmitter is connected to numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer successively; Described reception antenna, CDMA uplink receiving unit, CDMA demodulating unit are connected to data feedback channel successively;
Each passage of described multiple definition base station comprises the connected multiple different definition MEPG-2 code stream machines of group multiplexing machine compatible from single channel multichannel, and CA system, digital intermediate frequency modulator, Digital Up Convert channel plate, the High Linear numeral MUDS transmitter of to connect successively with the compatible group's multiplexing machine of single channel multichannel, the High Linear numeral MUDS transmitter of each passage is all connected with numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer, and the signal of this numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer exports broadband bipolar plate transmitting antenna to; Described each channel bit stream machine comprises 1 high definition MEPG-2 code stream machine and 2 middle definition MEPG-2 code stream machines or comprises 1 high definition MEPG-2 code stream machine and 4 middle low definition MEPG-2 code stream machines, or 6 middle definition MEPG-2 code stream machines, or 12 middle low definition MEPG-2 code stream machines;
The resolution of high definition TV is 1440 × 1080 × 25, middle definition was 720 × 576 × 25 (being equivalent to DVD level), middle low definition was 352 × 576 × 25 (being equivalent to SVCD level), bandwidth shared by a set of high definition TV and 4 overlap in bandwidth shared by definition television suitable, bandwidth shared by a set of middle definition television and 2 overlap in bandwidth shared by low-definition television suitable, in order to maximally utilise bandwidth resources and meet the user's request of different levels, the present invention adopts the compatible mixed transport of multiple definition, by the bandwidth calculation taking an analog channel, a set of high definition can be transmitted in an analog television channels bandwidth, definition digital television program in two covers, low definition digital television program in a set of high definition, 4 covers can be transmitted, definition digital television program in 6 covers can be transmitted, low definition digital television program in definition in 2 covers, 8 covers can be transmitted, can transmit low definition digital television program in 12 covers, transmission channel can adopt the DVB-C passage of QAM modulation, the DVB-T passage of COFDM modulation, or the hybrid channel of the two.
Digital Transmission of the present invention still can realize normal reception when received field strength is 30dBuv, still can receive at the twilight-zone of artificial antenna TV, covering efficiency increases substantially, coverage distance also significantly expands simultaneously, but inevitably there is blind area in radiovision, the present invention is like this equally, adopts relay system cleaning blind area for this reason.
Describedly unidirectionally directly put alms giver's parabolic antenna that relay station connects successively, one-level wide band cavity filter, low noise amplifier, secondary chamber fluid filter, High Linear wideband power amplifer, three grades of cavity body filters, retransmit directional antennas;
Alms giver's parabolic antenna receives aerial digital television signal and carries out wideband cavity filtering, low noise amplification, and cavity filtering again carries out power amplification by High Linear wideband power amplifer, cavity filtering, transfers out by retransmitting directional antenna.Here, the same frequency feedback circulation between transmitting-receiving be cut off, must receive-transmit isolation be improved.The present invention compares by increasing before and after dual-mode antenna, the distance of dual-mode antenna is widened in vertical and horizontal direction, dual-mode antenna adopts the not technological means such as like-polarized antenna, increase receive-transmit isolation, general isolation between transmitting and receiving antenna is greater than this repeater gain 15dBC, adopt repeater scheme, mainly in order to save frequency resource.
Described unidirectional forward relay station comprise connect successively alms giver's parabolic antenna, one-level cavity body filter, low noise amplifier, frequency converter, secondary chamber fluid filter, High Linear wideband power amplifer, three grades of cavity body filters, retransmit omnidirectional antennas;
The transmitting-receiving of forward relay station adopts different frequency, effectively can solve the problem that influences each other between transmitting-receiving, will carry out frequency-conversion processing for this reason.This frequency converter adopts vibrate VCO frequency synthesis, two balance or 4 balanced mixing technology, low noise high linear of accurate high stability crystal oscillator, medium to amplify, to ensure that the bit error rate of system reaches minimum with the modulation error rate and (modulates error rate MER value higher, represent that the error rate is lower), when adopting Direct Conversion, the multiple harmonic signal produced to prevent local oscillator, the filtering of sound table and LC filtering is adopted to be used in combination, the filtering of sound table obtains good filter effect, LC filtering filtering multiple frequence signal.
Numeral MUDS relay station is different from mobile communication and directly puts relay station, mainly broadband relay, and each part of this relay station all will adopt broadband technology.
Described two-way relay station of directly putting comprises and is connected in parallel on alms giver's duplexer and the up link retransmitted between duplexer and down link, and the alms giver's parabolic antenna be connected with alms giver's duplexer, with the repeating transmission directional antenna retransmitted duplexer and be connected; Described down link comprises the descending low noise amplifier of connecting successively, descending cavity body filter, downstream broadband High Linear power amplifier; Described up link comprises the up low noise amplifier of connecting successively, up cavity body filter, upstream broadband High Linear power amplifier;
Adopt the method can expand uplink and downlink coverage and the cleaning blind area of bi-directional digital MUDS multimedia base station, the downstream signal come base station is received by donor antenna, undertaken being with outer filtering to proceed to down link by duplexer, amplify through low noise amplifier, cavity body filter carries out filtering, broadband High Linear power amplifier amplifies, and proceeds to repeating transmission omni-directional antenna transmission go out by duplexer filtering.The operation principle of up link is similar to descending, need improve the isolation of transmitting-receiving here equally, and its technical measures are suitable with unidirectional repeater; The insulated degree requirement of uplink and downlink reaches more than 80dB, could effectively eliminate uplink and downlink and mutually disturb.Wideband digital MUDS of the present invention is two-way directly put in put relay station uplink and downlink bandwidth unequal, generally descending wider and up narrower.
Described broadband type numeral MUDS two-way converting relay station comprises and is connected in parallel on alms giver's duplexer and the up link retransmitted between duplexer and down link, and the alms giver's parabolic antenna be connected with alms giver's duplexer, with the repeating transmission omnidirectional antenna retransmitted duplexer and be connected; Described down link comprises the descending low noise amplifier of connecting successively, descending frequency converter, descending cavity body filter and downstream broadband High Linear power amplifier; Described up link comprises the up low noise amplifier of connecting successively, up frequency converter, up cavity body filter and upstream broadband High Linear power amplifier; Uplink and downlink all need to carry out frequency-conversion processing, there is not transceiver insulation problem in this two-way converting relay station, retransmitting antenna adopts omnidirectional antenna, up-downgoing carries out duplexer by duplexer, the receive-transmit isolation of uplink and downlink requires to reach more than 80dB, eliminate the mutual interference of up-downgoing, wideband power amplifer adopts High Linear low noise, high flat degree power amplifier.
Described user side subsystem is made up of user's reception antenna, user's dual-mode antenna, number receiving set up box, number television receiver, user's two-way multimedia terminal.When wherein user side antenna is merely for receiving, low noise Active Receiving Antenna can be adopted.Low noise Active Receiving Antenna of the present invention has perpendicular polarization and horizontal polarization two type, Active Receiving Antenna adopts ABS plastic injection molded, divide upper and lower cover plates, there is waterproof feature, bipolar plate is adopted to make oscillator, amplify as the first order with low noise sound field pipe, and adopt inductance coil lightning protection and antistatic.
Claims (5)
1. a low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system, is characterized in that it is made up of base sub-system, relaying subsystem, user side subsystem three parts; Described base sub-system comprises broadband type base station, adjacent frequency multiplex (MUX) synthesis type base station, optical-fiber type base station, two-way multimedia base station, multiple definition base station; The each channel in described broadband type base station is made up of MPEG-2 code stream machine, the compatible group's multiplexing machine of single channel multichannel, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, digital decimeter wave adjacent frequency mixer channel, High Linear numeral MUDS wideband transmitter, broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to digital decimeter wave adjacent frequency mixer channel respectively and carries out adjacent frequency mixing, and its mixed signal is amplified through High Linear numeral MUDS wideband transmitter, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to High Linear numeral MUDS transmitter respectively and amplifies and export on numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer Zhong He road, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to High Linear numeral MUDS transmitter respectively and amplifies and export on numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer Zhong He road, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit; Described relay system comprises directly puts relay station and forward relay station; Described user side is made up of user antenna, top box of digital machine, digital television receiver etc.; Described relay station of directly putting is divided into and unidirectionally directly puts relay station and two-wayly directly put relay station, described forward relay station is divided into unidirectional forward relay station and two-wayly directly puts relay station.
2. a kind of low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system as claimed in claim 1, is characterized in that each channel of described adjacent frequency multiplex (MUX) synthesis type base station comprises MPEG-2 code stream machine, single channel and the compatible group's multiplexing machine of shunt, user management authoring system, CA scrambling machine, digital intermediate frequency modulator, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and broadband bipolar plate transmitting antenna; Described digital intermediate frequency modulator is QAM intermediate frequency modulator or COFDM intermediate frequency modulator; What described MPEG-2 code stream machine exported single programs or Polymera flows to the compatible group's multiplexing machine of single channel multichannel by the TS of Moving Picture Experts Group-2; The TS of multiple single programs to be flowed by the mode of time-division by the compatible group's multiplexing machine of described single channel multichannel or the TS stream of multiple program is multiplexed into the TS stream in a broadband, and the program capacity that broadband TS flows is generally definition (720 × 576 × 25) TV programme in 6 covers; Described user management and the toll administration of authoring system to user and the watching authorization to user; Its management information inputs to CA scrambling machine together with flowing with broadband TS; Described CA scrambling machine adopts the dynamic scrambling of control word pseudorandom, and is encrypted control word, forms the keys such as EMC, EMM, multiplexingly in TS stream, transfers to digital intermediate frequency modulator; Digital Up Convert channel plate is joined from digital intermediate frequency modulator digital medium-frequency signal out; The Digital Up Convert channel plate of each channel inputs to High Linear numeral MUDS transmitter respectively and amplifies and export on numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer Zhong He road, is gone out by broadband bipolar plate transmission antennas transmit; Described Digital Up Convert plate is made up of the first intermediate frequency low noise amplification unit, the second intermediate frequency low noise amplification unit, intermediate frequency sound table filter unit, two balanced mixing unit, high-frequency low noise amplifying unit, the first minor spiral cavity filter unit, the second minor spiral cavity filter unit, adjustable damping unit, High Linear amplifying unit, accurate high stability crystal oscillator, crystal oscillation fractional frequency device, phase demodulation comparator, pre-divider, frequency divider and medium vibration VCO; By the accurate high stability crystal oscillator source for referencial use that frequency accuracy and stability are 10-7-10-9, phase demodulation comparator is entered by crystal oscillation fractional frequency device, the oscillator signal that medium vibration VCO produces enters phase demodulation comparator by pre-divider and frequency divider, phase demodulation comparator compares two paths of signals, in the mode of phase-locked loop, the frequency of oscillation of FEEDBACK CONTROL VCO, changes the local oscillation signal f0 that frequency dividing ratio obtains different frequency; Digital medium-frequency signal DIF is input to the first low noise intermediate frequency amplifier circuit amplifying unit, by the filtering of IF sound table, the second low noise intermediate frequency amplifying unit, carrying out two balanced low noise mixing forming frequency through two balanced mixing unit and local oscillator f0 is the high-frequency signal of f0 ± DIF, channel filtering is carried out by the first minor spiral cavity body filter, successively by high-frequency low noise amplifying unit, adjustable attenuator adjusting signal intensity, input the second minor spiral cavity body filter again and carry out cavity filtering, export through High Linear amplifying unit.
3. as a kind of low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system of Claims 2 or 3, it is characterized in that described High Linear numeral MUDS transmitter comprises a power amplifier, this power amplifier adopts negative front feedback power to amplify, pre-distorted power amplifies and high-power rollback three schemes improve the linearity, wherein high-power rollback type power amplifier is by low noise amplification unit, 3dB broadband ceramic coupler and 50 Ω build-out resistors, the modular promotion High Linear amplifying unit that two performances are consistent, the final stage High Linear power amplification unit that two performances are consistent, 3dB wideband high-power ceramic coupler, high-power 50 Ω build-out resistors and standing wave detect isolator composition, radiofrequency signal is input to low noise amplification unit, enter 3dB ceramic coupler to carry out symmetry and be shunted to two-way, each road is carried out modular respectively and is promoted High Linear amplifying unit, the amplification of final stage High Linear power amplification unit, carry out conjunction road by 3dB wideband high-power ceramic coupler and increase power, detect isolator by standing wave and eliminate reflected wave output.
4. a kind of low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system as claimed in claim 1, is characterized in that described optical-fiber type base station comprises the home base stations be connected with HFC fiber-coaxial net, the multiple telepoint base stations be connected with HFC fiber-coaxial net by DVB demodulation modulating unit; Described home base stations and telepoint base station can be all broadband type base station or adjacent frequency multiplex (MUX) synthesis type base station; Described DVB demodulation modulating unit comprises DVB-C, DVB-T two kinds of demodulation modulating units, described DVB-C demodulation modulating unit comprises DVB-C code stream receiver and QAM modulation device, the TS that this DVB-C code stream receiver receives from the MPEG-2 of HFC fiber-coaxial net flows, this TS stream is carried out QAM modulation by QAM modulation device, and the signal after modulation inputs to telepoint base station; Described DVB-T demodulation modulating unit comprises DVB-T code stream receiver and COFDM modulator, the TS that this DVB-T code stream receiver receives from the MPEG-2 of HFC fiber-coaxial net flows, this TS stream is carried out COFDM modulation by COFDM modulator, and the signal after modulation inputs to telepoint base station.
5. a kind of low error rate digital MUDS multi-path decimetric wave near-frequency wireless television transmitting system as claimed in claim 1, is characterized in that described two-way multimedia base station comprises multiple DVB digital television channel, multiple DVB data broadcast passage, Digital Up Convert channel plate, High Linear numeral MUDS transmitter, nets equipment, numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer and the broadband bipolar plate transmitting antenna of networking with broadband INT; Described DVB digital television channel comprises DVB-C digital television channel and DVB-T digital television channel; Described DVB data broadcast passage comprises DVB-C data broadcast passage and DVB-T data broadcast passage; Each DVB digital television channel and each DVB data broadcast passage input to numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer by Digital Up Convert channel plate, High Linear numeral MUDS transmitter respectively, and broadband bipolar plate transmitting antenna is connected with this numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer; The described equipment of networking of netting with broadband INT comprises DVB gateway, down going channel, data feedback channel, CA system, DVB modulator, High Linear numeral MUDS transmitter, CDMA demodulating unit, CDMA uplink receiving unit and reception antenna, down going channel and data feedback channel to be netted with broadband INT by DVB gateway and are connected, and realize IP packet and TS flows and the conversion of CDMA packet; Described down going channel, CA system, DVB modulator, High Linear numeral MUDS transmitter is connected to numeric type multichannel decimetric wave adjacent-frequency multiplexing synthesizer successively; Described reception antenna, CDMA uplink receiving unit, CDMA demodulating unit are connected to data feedback channel successively.
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| CN201410650113.6A CN104378650A (en) | 2014-11-14 | 2014-11-14 | Digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with low error rate |
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| CN201410650113.6A Pending CN104378650A (en) | 2014-11-14 | 2014-11-14 | Digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with low error rate |
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| CN (1) | CN104378650A (en) |
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| CN105207710A (en) * | 2015-08-19 | 2015-12-30 | 东华大学 | Wireless frequency modulation broadcast signal digit relay IP core and transceiver |
| WO2016150031A1 (en) * | 2015-03-20 | 2016-09-29 | 京东方科技集团股份有限公司 | Video signal wireless transmitter, receiver, transmission system, and display system |
| CN108632755A (en) * | 2017-03-16 | 2018-10-09 | 国家新闻出版广电总局广播电视卫星直播管理中心 | A kind of orientation management method and system of set-top box |
| CN109996040A (en) * | 2019-04-04 | 2019-07-09 | 无锡智图汇联科技有限公司 | A method of applied to the COFDM uplink enhancing taken photo by plane and monitored |
| CN111835666A (en) * | 2020-07-10 | 2020-10-27 | 成都六三零电子设备有限公司 | 5.73 ~ 5.81GHz/50W linear frequency modulation transmitter |
| CN113611212A (en) * | 2021-07-30 | 2021-11-05 | 北京京东方显示技术有限公司 | Light receiving sensor, display panel, and electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016150031A1 (en) * | 2015-03-20 | 2016-09-29 | 京东方科技集团股份有限公司 | Video signal wireless transmitter, receiver, transmission system, and display system |
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| CN105207710A (en) * | 2015-08-19 | 2015-12-30 | 东华大学 | Wireless frequency modulation broadcast signal digit relay IP core and transceiver |
| CN108632755A (en) * | 2017-03-16 | 2018-10-09 | 国家新闻出版广电总局广播电视卫星直播管理中心 | A kind of orientation management method and system of set-top box |
| CN108632755B (en) * | 2017-03-16 | 2021-01-15 | 国家新闻出版广电总局广播电视卫星直播管理中心 | Positioning management method and system for set top box |
| CN109996040A (en) * | 2019-04-04 | 2019-07-09 | 无锡智图汇联科技有限公司 | A method of applied to the COFDM uplink enhancing taken photo by plane and monitored |
| CN111835666A (en) * | 2020-07-10 | 2020-10-27 | 成都六三零电子设备有限公司 | 5.73 ~ 5.81GHz/50W linear frequency modulation transmitter |
| CN113611212A (en) * | 2021-07-30 | 2021-11-05 | 北京京东方显示技术有限公司 | Light receiving sensor, display panel, and electronic apparatus |
| CN113611212B (en) * | 2021-07-30 | 2023-08-29 | 北京京东方显示技术有限公司 | Light receiving sensor, display panel, and electronic apparatus |
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