CN202353725U - Digital television radio frequency synchronous digital processing cover system - Google Patents
Digital television radio frequency synchronous digital processing cover system Download PDFInfo
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- CN202353725U CN202353725U CN201120456627XU CN201120456627U CN202353725U CN 202353725 U CN202353725 U CN 202353725U CN 201120456627X U CN201120456627X U CN 201120456627XU CN 201120456627 U CN201120456627 U CN 201120456627U CN 202353725 U CN202353725 U CN 202353725U
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Abstract
The utility model relates to the technical field of a digital television ground broadcast, in particular to a digital television radio frequency synchronous digital processing cover system. In the digital television radio frequency synchronous digital processing cover system, each synchronous digital processor can at most process 40M bandwidth digital television radio frequency signals. A local (area) overlay network only needs a digital television signal resource (center station). The center station can convert the digital television radio frequency signals into digital optical signals through a synchronous digital processing host, and transmit the digital optical signals to other stations in the overlay network through an optical fiber transceiving device; the other stations all transmit a center station signal resource, so as to solve the problems of frequency synchronism and code element synchronism; all stations can calculate the time delay of a data transmission link, and independently adjust the signal storage time, so as to solve the problem of the time synchronism. All launching points in the overlay network adjust the launching time delay according to engineering requirements through the time delay adjustment, and the time synchronism, the frequency synchronism and the code element synchronism among the launching points can be realized.
Description
Technical field
The utility model relates to the DTTB technical field, is specially a kind of DTV radio frequency synchronous digital and handles covering system.
Background technology
At present, traditional SFN is made up of many digital transmitters, adopts the transmitting station of net distribution to realize covering on a large scale.Because all transmitters adopt same frequency emission, so require three precise synchronization: Frequency Synchronization, time synchronized, symbol synchronization.
For realizing system synchronization, mono-frequency network system has also increased key equipments such as SFN (SFN) adapter, GPS except encoder, modulator.Frequency Synchronization is realized by GPS that mainly the stability of general GPS reference clock can reach the 1E-12 magnitude; Frequency stability still can reach more than the 1E-10 in the losing lock 24 hours.Time synchronized is accomplished by SFN adapter and GPS jointly, and GPS provides accurate 1PPS pulse, and the SFN adapter of making a start carries out huge frame to the TS stream of importing and handles (MIP), and receive end and separate MIP, thus the requirement of realization time synchronized.Symbol synchronization realizes through the SFN adapter.Because the requirement of time synchronized, the distance between the adjacent transmission station has certain limitation.
Adopt this kind mode to set up the DTV nerve of a covering in broadband (multichannel), every many channels.Each covers website all needs a whole set of SFN equipment.The realization difficulty of its Frequency Synchronization, time synchronized, symbol synchronization is big, formation is complicated.
In order to develop the DTTB network system better sooner; The DTV Synchronous Processing and the transmission coverage mode that need development of new; Coverage effect is good, stability is strong to make up, and project cost is low and the low digital television transfer nerve of a covering of operating cost.
Summary of the invention
The purpose of the utility model is to provide a kind of DTV radio frequency synchronous digital to handle covering system, and each the synchronous digital processor in the system can be handled 40M bandwidth numeral TV RF signals at most.A part (zone) nerve of a covering only needs a digital television signal source (central station); Central station converts the DTV radiofrequency signal into digital optical signal through synchronous digital processor main frame and is transferred to other websites in the nerve of a covering through fiber optical transceiver; The equal retransmission center of each website station signal source solves Frequency Synchronization, symbol synchronization problem with this.Each website can the calculated data transmission link time delay.And can the independent regulation signal storage time.With stationary problem settling time.Make interior each launch point of the area of coverage according to engine request adjustment emission time delay with crossing the time delay adjustment.Realize time synchronized, Frequency Synchronization, symbol synchronization between each launch point.
The technical scheme of the utility model is:
A kind of DTV radio frequency synchronous digital is handled covering system; It is characterized in that it comprises central station and remote terminal; Said central station comprises DTV synchronous digital processing host, and DTV synchronous digital processing host comprises automatic gain control circuit, power splitter, central station frequency mixer, analog to digital converter, baseband processing unit, central station optical fiber transceiving unit; Automatic gain control circuit connects two-way central station frequency mixer through power splitter; Two-way central station frequency mixer connects the input of baseband processing unit respectively through an analog to digital converter; The output of baseband processing unit connects the central station optical fiber transceiving unit, and said optical fiber transceiving unit comprises many group fiber optical transceivers; Remote terminal comprises DTV synchronous digital processing slave; The DTV synchronous digital is handled slave and is comprised remote terminal optical fiber transceiving unit, baseband processing unit, digital to analog converter, remote terminal frequency mixer and mixer; Said remote terminal optical fiber transceiving unit connects the input of baseband processing unit; The output of baseband processing unit connects the remote terminal frequency mixer through digital to analog converter, and the remote terminal frequency mixer connects mixer; A central station connects one or more remote terminals through signal transmission link, and each remote terminal perhaps connects or independent existence through optical fiber and another corresponding remote terminal, forms the DTV networking structure.
Said DTV networking structure adopts honeycomb to distribute, and networking structure is multidiameter delay networking structure, multi-path serial networking structure, daisy networking structure or tree-like link-group web frame.
The networking structure of said multidiameter delay is that a plurality of outputs of a central station are connected with a plurality of remote terminals respectively; The networking structure of multi-path serial is that a central station and a plurality of remote terminal are connected in series successively; The networking structure of daisy is that a plurality of outputs of a central station are connected with a plurality of remote terminals respectively, and each remote terminal is connected in series with a plurality of remote terminals respectively; The networking structure of tree-like link is that the output that passes through of a central station is connected with a plurality of remote terminals respectively, and each remote terminal is connected in series with a plurality of remote terminals respectively.
Said baseband processing unit is the on-site programmable gate array FPGA module or is Digital Signal Processing DSP module.
Said remote terminal also comprises power amplifier unit, and power amplifier unit connects the mixer output, and power amplifier unit comprises the linear amplifying unit of the small-signal that connects successively, cavity body filter and power amplifier.
The beneficial effect of the utility model is:
The DTV synchronous digital processor of the utility model down-converts to intermediate-freuqncy signal with the DTV radiofrequency signal, converts digital signal to through ADC.The FPGA baseband processing unit converts digital signal into standard C PRI interface light signal and send optical transceiver, be transmitted through the fiber to remote terminal after, the FPGA baseband processing unit of remote terminal converts light signal to digital signal again.Digital signal converts intermediate-freuqncy signal to through DAC, and intermediate-freuqncy signal is reduced into the DTV radiofrequency signal after up-conversion.The reference clock that whole process adopts is central station and sends.Each remote terminal is reduced into and the reference clock identical with central station after receiving.The frequency of all reference clocks is in full accord in the system.Realize the Frequency Synchronization mode with this function replacement tradition networking applying GPS synchronised clock.
The advantage that the DTV synchronous digital treatment system of the utility model has Frequency Synchronization, time synchronized, symbol synchronization, framework is simple and easy, coverage effect good, stability is strong; The project cost low operating cost is low, can be adaptable across the digital television transfer nerve of a covering.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of the central station of the utility model.
Fig. 3 is the structural representation of the remote terminal of the utility model.
Fig. 4 is the multidiameter delay networking structure sketch map of the utility model.
Fig. 5 is the multi-path serial networking structure sketch map of the utility model.
Fig. 6 is the daisy networking structure sketch map of the utility model.
Fig. 7 is link-group web frame sketch map the utility model or tree-like.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
Like Fig. 1, Fig. 2, Fig. 3; A kind of DTV radio frequency synchronous digital is handled covering system; It is characterized in that it comprises central station and remote terminal; Said central station comprises DTV synchronous digital processing host, and DTV synchronous digital processing host comprises automatic gain control circuit, power splitter, central station frequency mixer, analog to digital converter, baseband processing unit, central station optical fiber transceiving unit; Automatic gain control circuit connects two-way central station frequency mixer through power splitter; Two-way central station frequency mixer connects the input of baseband processing unit respectively through an analog to digital converter; The output of baseband processing unit connects the central station optical fiber transceiving unit, and said optical fiber transceiving unit comprises many group fiber optical transceivers; Remote terminal comprises DTV synchronous digital processing slave; The DTV synchronous digital is handled slave and is comprised remote terminal optical fiber transceiving unit, baseband processing unit, digital to analog converter, remote terminal frequency mixer and mixer; Said remote terminal optical fiber transceiving unit connects the input of baseband processing unit; The output of baseband processing unit connects the remote terminal frequency mixer through digital to analog converter, and the remote terminal frequency mixer connects mixer; A central station connects one or more remote terminals through signal transmission link, and each remote terminal perhaps connects or independent existence through optical fiber and another corresponding remote terminal, forms the DTV networking structure.
The DTV networking structure adopts honeycomb to distribute, and networking structure is multidiameter delay networking structure, multi-path serial networking structure, daisy networking structure or tree-like link-group web frame.
Like Fig. 4, Fig. 5, Fig. 6, Fig. 7, the networking structure of multidiameter delay is that a plurality of outputs of a central station are connected with a plurality of remote terminals respectively; The networking structure of multi-path serial is that a central station and a plurality of remote terminal are connected in series successively; The networking structure of daisy is that a plurality of outputs of a central station are connected with a plurality of remote terminals respectively, and each remote terminal is connected in series with a plurality of remote terminals respectively; The networking structure of tree-like link is that the output that passes through of a central station is connected with a plurality of remote terminals respectively, and each remote terminal is connected in series with a plurality of remote terminals respectively.
Baseband processing unit is the on-site programmable gate array FPGA module or is Digital Signal Processing DSP module.
Remote terminal also comprises power amplifier unit, and power amplifier unit connects the mixer output, and power amplifier unit comprises the linear amplifying unit of the small-signal that connects successively, cavity body filter and power amplifier.
A part (zone) nerve of a covering has only a central station, and fore-end and central station are formed data center, and fore-end is responsible for converting program source to the DTV radiofrequency signal.Central station converts the DTV radiofrequency signal to digital optical signal.The digital optical signal that remote terminal sends central station is reduced into the DTV radiofrequency signal.Realize the whole network coverage through different network construction forms.The digital television transfer covering system of the utility model comprises central station and remote terminal.Central station is responsible for converting the DTV radiofrequency signal into the digital fiber signal, and remote terminal is responsible for the digital fiber signal is reduced to the DTV radiofrequency signal.Remote terminal can be transmitted to other remote terminals once more with the central station signal.
The optical fiber that adopts between central station and remote terminal, remote terminal and the remote terminal carries out transfer of data; In the optical fiber transmitting digital TV signal not with other signal mixed transport; Fiber optical transceiver adopts wavelength-division multiplex technique; Downlink transfer digital television signal, uplink control signal and each remote station equipment state-detection amount.Said signal transmission link is a fiber optic network. adopt general international standard CPRI form interface.
Because the bandwidth constraints of analog to digital converter and digital to analog converter, central station is given 2 frequency mixers with the DTV radiofrequency signal of input through the centimetre device; Frequency through adopting different frequencies is combined, and 5 channel digital television radiofrequency signals are become 2 sections intermediate-freuqncy signals, and the reference clock of combining is frequently provided by baseband processing unit, and baseband processing unit provides simultaneously local clock is sent to remote terminal through fiber optical transceiver; Is digital signal through No. 2 analog to digital converters with the analog signal conversion of importing; To import intermediate-freuqncy signal through digital filter and realize thorough segmentation, one section for comprising 2 physical channel digital television informations, and one section comprises 3 physical channel digital television signals; Convert digital signal into general international standard CPRI form interface through baseband processing unit, realize Optical Fiber Transmission through fiber optical transceiver.
The baseband processing unit of remote terminal converts the fiber-optic signal that receives into digital signal and through digital filter, digital to analog converter digital signal is reduced into 2 sections intermediate-freuqncy signals; Wherein one section for comprising 2 physical channel digital television informations, and one section comprises 3 physical channel digital television signals;
Frequency through adopting different frequencies is combined, the output that makes 2 remote terminal frequency mixers through behind the mixer in a continuous frequency range; Finally be reduced into 5 channel digital television radiofrequency signals.
The reference clock that the read-write clock of the work clock of analog to digital converter, digital to analog converter and baseband processing unit, the data storage of baseband processing unit, the reference clock of combining have frequently all adopted central station to send.
Frequently combining the clock that adopts is the reference clock at remote terminal receiving center station, so be 0 in whole transmission course medium frequency error.Through CPU digital signal memory time of FPGA baseband processing unit is set, realizes time delay adjustment each remote terminal.Through realizing the Transmission Fibers measurement of length two-way time of computer center's station-remote terminal, remote terminal-remote terminal.For each remote terminal time delay adjustment in the network coverage provides reference.Reference clock and frequently comprehensive component frequency source, frequency source inserts the frequency converter module respectively.
The DTV radiofrequency signal down-converts to intermediate-freuqncy signal, converts digital signal to through ADC.The FPGA baseband processing unit converts digital signal into standard C PRI interface light signal and send optical transceiver, be transmitted through the fiber to remote terminal after, the FPGA baseband processing unit of remote terminal converts light signal to digital signal again.Digital signal converts intermediate-freuqncy signal to through DAC, and intermediate-freuqncy signal is reduced into the DTV radiofrequency signal after up-conversion.The reference clock that whole process adopts is central station and sends.Each remote terminal is reduced into and the reference clock identical with central station after receiving.The frequency of all reference clocks is in full accord in the system.Use the gps synchronised clock with this function replacement tradition networking and realize the Frequency Synchronization mode.
The reference clock that the read-write clock of the work clock of the ADC in the native system, DAC, FPGA, data storage, the reference clock of combining have frequently all adopted central station to send.
The DTV radio frequency synchronous digital of the utility model is handled covering system, and central station and remote terminal all contain digital filter.Digital filter bandwidth 7.6M, the inclined to one side 400k of centre frequency suppresses greater than 35dBc.
Embodiment recited above describes the preferred implementation of the utility model; Be not that design and scope to the utility model limits; Do not breaking away under the utility model design concept prerequisite; Common engineers and technicians make the technical scheme of the utility model in this area various modification and improvement all should fall into the protection range of the utility model, and the technology contents that the utility model is asked for protection all is documented in claims.
Claims (5)
1. a DTV radio frequency synchronous digital is handled covering system; It is characterized in that it comprises central station and remote terminal; Said central station comprises DTV synchronous digital processing host, and DTV synchronous digital processing host comprises automatic gain control circuit, power splitter, central station frequency mixer, analog to digital converter, baseband processing unit, central station optical fiber transceiving unit; Automatic gain control circuit connects two-way central station frequency mixer through power splitter; Two-way central station frequency mixer connects the input of baseband processing unit respectively through an analog to digital converter; The output of baseband processing unit connects the central station optical fiber transceiving unit, and said optical fiber transceiving unit comprises many group fiber optical transceivers; Remote terminal comprises DTV synchronous digital processing slave; The DTV synchronous digital is handled slave and is comprised remote terminal optical fiber transceiving unit, baseband processing unit, digital to analog converter, remote terminal frequency mixer and mixer; Said remote terminal optical fiber transceiving unit connects the input of baseband processing unit; The output of baseband processing unit connects the remote terminal frequency mixer through digital to analog converter, and the remote terminal frequency mixer connects mixer; A central station connects one or more remote terminals through signal transmission link, and each remote terminal perhaps connects or independent existence through optical fiber and another corresponding remote terminal, forms the DTV networking structure.
2. DTV radio frequency synchronous digital according to claim 1 is handled covering system; It is characterized in that said DTV networking structure adopts honeycomb to distribute, networking structure is multidiameter delay networking structure, multi-path serial networking structure, daisy networking structure or tree-like link-group web frame.
3. DTV radio frequency synchronous digital according to claim 2 is handled covering system, and the networking structure that it is characterized in that said multidiameter delay is that a plurality of outputs of a central station are connected with a plurality of remote terminals respectively; The networking structure of multi-path serial is that a central station and a plurality of remote terminal are connected in series successively; The networking structure of daisy is that a plurality of outputs of a central station are connected with a plurality of remote terminals respectively, and each remote terminal is connected in series with a plurality of remote terminals respectively; The networking structure of tree-like link is that the output that passes through of a central station is connected with a plurality of remote terminals respectively, and each remote terminal is connected in series with a plurality of remote terminals respectively.
4. DTV radio frequency synchronous digital according to claim 1 is handled covering system, it is characterized in that said baseband processing unit is the on-site programmable gate array FPGA module or is Digital Signal Processing DSP module.
5. DTV radio frequency synchronous digital according to claim 1 is handled covering system; It is characterized in that said remote terminal also comprises power amplifier unit; Power amplifier unit connects the mixer output, and power amplifier unit comprises the linear amplifying unit of the small-signal that connects successively, cavity body filter and power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120456627XU CN202353725U (en) | 2011-11-17 | 2011-11-17 | Digital television radio frequency synchronous digital processing cover system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120456627XU CN202353725U (en) | 2011-11-17 | 2011-11-17 | Digital television radio frequency synchronous digital processing cover system |
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| CN202353725U true CN202353725U (en) | 2012-07-25 |
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| CN201120456627XU Expired - Fee Related CN202353725U (en) | 2011-11-17 | 2011-11-17 | Digital television radio frequency synchronous digital processing cover system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420947A (en) * | 2011-11-17 | 2012-04-18 | 于立 | Digital television radio-frequency synchronous digital processing and overlaying method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420947A (en) * | 2011-11-17 | 2012-04-18 | 于立 | Digital television radio-frequency synchronous digital processing and overlaying method and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210031 J03-B, Liu Liu Industrial Park, Taishan Park, Nanjing hi tech Development Zone, Jiangsu, China Patentee after: Saigew Microwave Science & Technology Co., Ltd. Address before: 210031 J03-B, Liu Liu Industrial Park, Taishan Park, Nanjing hi tech Development Zone, Jiangsu, China Patentee before: Nanjing Saigew Microwave Science & Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20171117 |