CN101188589B - Synchronization adaptation method and device for broadcast data in satellite synchronization distribution network - Google Patents
Synchronization adaptation method and device for broadcast data in satellite synchronization distribution network Download PDFInfo
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Abstract
The invention discloses a synchronous adapting device for broadcast data in a satellite synchronous distribution network and a method thereof. The device comprises an information source multiplexer, a Stimi stimulator, an OFDM modulator and a TDM modulator, wherein, the information source multiplexer outputs the broadcast service data; the Stimi stimulator is connected with the information source multiplexer, and the Stimi stimulator performs channel encoding to the broadcast service data output from the information source multiplexer, and symbols after the channel encoding are output in two ways; the OFDM modulator receives the symbols of the first way and performs outputting after the OFDM modulation; the OFDM signal is sent to a synchronous orbit satellite through a Ku wave band ground transmitter in Ku wave band after passing through a time delay module, and is transmitted after being transduced to the S wave band through a satellite; the TDM modulator receives the symbols of the second way, ordered TS flow is formed on the basis of the frequency point and the time slot of the symbols, DVB-S encoding and QPSK modulation are performed to the TS flow, a synchronizing sequence is inserted into the TS flow, and then the TS flow is output; the QPSK signal is sent to the synchronous orbit satellite in a time division multiplex TDM way when passing through the Ku wave band ground transmitter, and is directly transmitted in Ku wave band through the satellite.
Description
Technical field
The present invention relates to the simultaneous techniques in the satellite synchronization distribution network, more particularly, relate to the synchronous adaptation device of broadcast data in a kind of satellite synchronization distribution network.
Background technology
Digital broadcasting satellite system mainly utilizes satellite S-band ofdm signal directly to broadcast the business that the nationwide is provided and covers; And for ground wave environment more complicated in the city, or the indoor area that can't make things convenient for the receiving satellite broadcast signal; Adopt the form of land-based repeaters; Become the S-band ofdm signal to broadcast away the TDM conversion of signals of the Ku wave band of satellite transmits, directly broadcast replenishing of ofdm signal as the satellite S-band.This scheme can be taken into account the requirement of user to the broadcasting service coverage and the quality of reception, sets up digital multimedia broadcasting network in China quickly and effectively.
China is vast in territory, the transmission delay of satellite-signal arrival various places differs greatly (for example satellite-signal arrives Beijing and Shanghai will have the transmission delay that differs Millisecond); This delay will have a strong impact on the performance of whole system; Therefore; How to overcome transmission delay, accomplish that transmitting synchronous is a problem that extremely receives publicity.
Summary of the invention
The object of the invention aims to provide the synchronous adaptation device of broadcast data in a kind of satellite synchronization distribution network, is used for carrying out synchronous adaptation at the transmitting terminal of satellite synchronization distribution network.
According to an aspect of the present invention, the synchronous adaptation device of broadcast data in a kind of satellite synchronization distribution network is provided, comprises: information source multiplexer, output broadcast service data; The Stimi exciter is connected to the information source multiplexer, and the broadcast service data that the information source multiplexer is exported carries out chnnel coding, and the symbol after the chnnel coding is divided into two-way output; The OFDM modulator receives first via symbol and carries out OFDM modulation back output; This ofdm signal, and is transmitted this signal frequency conversion by satellite after send to geosynchronous satellite by Ku wave band ground transmitter with the Ku wave band through a time delay module after S-band; Also comprise the TDM modulator, receive the second road symbol, form orderly TS stream, TS stream is carried out the DVB-S coding, export after carrying out the QPSK modulation again and inserting synchronizing sequence based on the frequency of symbol and time slot; This QPSK signal sends to geosynchronous satellite via Ku wave band ground transmitter with the mode of time division multiplexing tdm, and by satellite the QPSK signal is directly transmitted with the Ku wave band.
According to one embodiment of the invention; The second road symbol behind the channel coding sends to the TDM modulator through an interface; Wherein, the granting of said interface code flow data is in proper order: send all interior OFDM points of first frequency of first time slot at first successively, send all interior OFDM points of second frequency of first time slot then; Redispatch all OFDM points in the 3rd frequency of first time slot; So far the symbol of accomplishing first time slot sends, and sends the symbol of second time slot afterwards, until the transmission of the symbol of accomplishing all time slots.
According to one embodiment of the invention; The TDM modulator is packaged into a data segment with the symbol of each frequency of said each time slot; Said data segment comprises header fields and content field, and said header fields comprises the field of indicating frequency, mapped mode and message transmission indication respectively; The TDM modulator also converts each data segment to TS stream; Wherein each data segment converts a series of TS bag to, and each said TS comprises synchronization field, error of transmission identification field, time slot mark, transport priority field, PID field, variable field, transmission scrambling control field, self adaptation filling control field, continuity indication counter field, transmission information field and data load field; The granting of bit stream data is in proper order in the said TS bag: send first frequency that an OFDM of first time slot is ordered at first successively; Send second frequency that an OFDM of first time slot is ordered then; All frequencies that the OFDM of first time slot of redispatching is ordered; So far accomplish the transmission that an OFDM of first time slot is ordered, send the 2nd OFDM point of first time slot afterwards, until accomplishing the transmission that all OFDM of first time slot are ordered; Carry out the transmission of all frequencies of OFDM point of second time slot again, until the transmission of all frequencies of OFDM point of last time slot.
According to one embodiment of the invention; Said transmission information field is 24 * 8 bits; The time synchronization information that wherein comprises 24 bits; Said time synchronization information is inserted the synchronized counter value of current time in first TS bag of first frequency symbol of each time slot, the respective field in all the other TS bags keeps.
According to one embodiment of the invention,, confirm corresponding single frequency point transmission data rate, the OFDM frequency number that satellite can transmit according to the OFDM mapped mode; Wherein, the corresponding single frequency point transmission data rate of BPSK is＞8Mbps that the OFDM frequency number that satellite can transmit is 3; The corresponding single frequency point transmission data rate of QPSK is＞16Mbps that the OFDM frequency number that satellite can transmit is 2; The corresponding single frequency point transmission data rate of 16QAM is＞32Mbps that the OFDM frequency number that satellite can transmit is 1;
According to transmission mode, confirm the QPSK transmission data rate; Wherein, 3 corresponding QPSK transmission data rates of BPSK frequency transmission mode are＞24Mbps; 2 corresponding QPSK transmission data rates of QPSK frequency transmission mode are＞32Mbps; 1 corresponding QPSK transmission data rate of 16QAM frequency transmission mode is＞32Mbps; 1 BPSK frequency, 1 corresponding QPSK transmission data rate of QPSK frequency transmission mode is＞24Mbps; 2 BPSK frequencies, 1 corresponding QPSK transmission data rate of QPSK frequency transmission mode is＞32Mbps.
According to one embodiment of the invention, said TDM modulator carries out the empty bag insertion of TS to TS stream and carries out rate-matched, and said TDM modulator comprises the DVB-S encoder, carries out the DVB-S coding, comprises carrying out RS (204,188) coding and 3/4 convolutional encoding; Said TDM modulator also comprises the QPSK modulation module, and TS stream is carried out the QPSK modulation.
According to one embodiment of the invention, said TDM modulator also comprises the time synchronized module, and the rise time mark also joins in the time slot indication TS bag of TS stream.
According to one embodiment of the invention, said time synchronized module generates pseudo random sequence as synchronizing sequence; Said TDM modulator also comprises the synchronizing signal insert module, and synchronizing sequence is inserted in the QPSK signal, and wherein I, Q two paths of signals insert the synchronizing sequence of homophase.
According to a second aspect of the invention, the synchronization adaptation method of broadcast data in a kind of satellite synchronization distribution network is provided, comprises: through information source multiplexer output broadcast service data; The broadcast service data of the information source multiplexer being exported with the Stimi exciter carries out chnnel coding, and the symbol after the chnnel coding is divided into two-way output; Receive first via symbol and carry out OFDM modulation back output; This ofdm signal, and is transmitted this signal frequency conversion by satellite after send to geosynchronous satellite by Ku wave band ground transmitter with the Ku wave band through a time delay module after S-band; Receive the second road symbol, form orderly TS stream, TS stream is carried out the DVB-S coding, export after carrying out the QPSK modulation again and inserting synchronizing sequence based on the frequency of symbol and time slot; This QPSK signal sends to geosynchronous satellite via Ku wave band ground transmitter with the mode of time division multiplexing tdm, and by satellite the QPSK signal is directly transmitted with the Ku wave band.
Adopt technical scheme of the present invention, can carry out strict Synchronization Control, be beneficial to realize the synchronous adaptation of broadcast data in the satellite synchronization distribution network at the transmitting terminal of satellite synchronization distribution network.
Description of drawings
In the present invention, identical Reference numeral is represented identical characteristic all the time, wherein,
Fig. 1 is the structured flowchart that is used to realize satellite synchronization distribution network of the present invention;
Fig. 2 is the structured flowchart of the synchronous adaptation device of broadcast data in the satellite synchronization distribution network according to an embodiment of the invention;
Fig. 3 forms the sketch map that symbol that TS flows through each frequency of each time slot in the journey is packaged into a data segment according to embodiments of the invention;
Fig. 4 forms TS to flow through the sequential format that carries out data transaction in the journey according to an embodiment of the invention;
Fig. 5 forms the process sketch map that TS flows through data transaction in the journey according to an embodiment of the invention;
Fig. 6 is the process sketch map of QPSK modulation according to an embodiment of the invention;
Fig. 7 is the structural representation of synchronizing sequence according to an embodiment of the invention;
Fig. 8 is the sketch map of bit stream data in interface code flow data and the TS bag according to an embodiment of the invention.
Embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
According to the present invention, the transmitter of the synchronous adaptation device of broadcast data in a kind of satellite synchronization distribution network is provided, with reference to figure 1, Fig. 1 is the structured flowchart that is used to realize satellite synchronization distribution network of the present invention.The signal that satellite 300 among Fig. 1 receives from synchronous adaptation device 100, and be transmitted to land-based repeaters 304 and user's receiving terminal 306 with satellite antenna 302.Continuation is with reference to figure 1, and this transmitter 100 comprises:
Stimi exciter 104 is connected to information source multiplexer 102, and the broadcast service data that information source multiplexer 102 is exported carries out chnnel coding, and the symbol after the chnnel coding is divided into two-way output; OFDM modulator (being included among the figure in the Stimi exciter 104) receives first via symbol and carries out OFDM modulation back output;
The one Ku wave band ground transmitter 106 connects Stimi exciter 104, will send to geosynchronous satellite 300 with the Ku wave band through the ofdm signal of time-delay, and by satellite 300 this signal frequency conversion transmitted after S-band;
The 2nd Ku wave band ground transmitter 110 is connected to TDM modulator 108, adopts the mode of time division multiplexing tdm that the QPSK data are sent to geosynchronous satellite 300 with the Ku wave band, and by satellite the QPSK signal is directly transmitted with the Ku wave band.
With reference to figure 2; Fig. 2 is the structured flowchart of the synchronous adaptation device of broadcast data in the satellite synchronization distribution network according to an embodiment of the invention, further shows the structure chart of two critical piece Stimi exciters 104 of the present invention (comprising the OFDM modulator) and TDM modulator 108.
This Stimi exciter 104 comprises:
The A interface is the input interface of Stimi exciter 104;
Information source interface module 140 is connected to information source multiplexer 102 receiving broadcast service data;
OFDM modulation module 144 receives the first via output from channel coding module 142, carries out the OFDM modulation;
The first Data Format Transform module 146 is received from the second tunnel of channel coding module and exports, and carries out exporting to TDM modulator 108 through C interface after the Data Format Transform;
B interface is with the output of said time delay module 148 output as Stimi exciter 104.
According to shown in Figure 2, the output of B interface is amplified back output through 141 frequency conversions of the first frequency conversion amplifier, and wherein, what B interface was exported is the 70MHz intermediate frequency, and 141 outputs of the first frequency conversion amplifier is the 11GHz high frequency.
This TDM modulator 108 comprises:
Receive the output of the first Data Format Transform module 146 from C interface;
The second Data Format Transform module 180 receives the output of first data conversion module 146 through C interface, and the first Data Format Transform module 146 and the second Data Format Transform module 180 be common to be realized forming TS and flow through the data transaction in the journey, output TS stream;
DVB-S channel coding module 182 is carried out the DVB-S chnnel coding to the TS stream from the output of the second Data Format Transform module;
Time synchronized module 186, rise time mark offer the second Data Format Transform module 182, also generate synchronizing sequence;
Synchronizing signal insert module 188, the synchronous code that time synchronized module 186 is produced is inserted in the QPSK signal of QPSK modulation module 184 generations;
D interface is with the output of synchronizing signal insert module 188 output as TDM modulator 108.
According to shown in Figure 2, the output of D interface is amplified back output through 181 frequency conversions of the second frequency conversion amplifier, and what D interface was exported is the 70MHz intermediate frequency, and 181 outputs of the second frequency conversion amplifier is the 11GHz high frequency
Wherein, the above-mentioned first Data Format Transform module and the second Data Format Transform module realize data transaction jointly, realize the transfer of data between the first Data Format Transform module and the second Data Format Transform module through 25 pin SPI interfaces based on LDVS.According to embodiments of the invention, the TDM modulator is packaged into a data segment with the symbol of each frequency of each time slot, and data segment comprises header fields and content field, and header fields comprises the field of indicating frequency, mapped mode and message transmission indication respectively.With reference to figure 3, Fig. 3 forms the sketch map that symbol that TS flows through each frequency of each time slot in the journey is packaged into a data segment according to embodiments of the invention.
Wherein the 0th byte of head H ead is the Freq field, and the expression frequency is as shown in table 1.
Table 1Freq Field Definition
| The Freq field | Meaning | |
| 0x0 | |
|
| 0x1 | |
|
| | Frequency | 2 |
| 0x3～0xFF | Reserved |
Head the 2nd byte is the Map field, the constellation point mapped mode of expression follow-up data.Because the constellation point mapped mode is different, the length of follow-up Data also can be different, as shown in table 2.
Table 2Map Field Definition and Data length
| The Map field | Mapped mode | Data length (byte) |
| 0x00 | BPSK | 17280 |
| 0x01 | QPSK | 34560 |
| 0x02 | 16QAM | 69120 |
| 0x03～0xFF | Reserved | Rese?rved |
Head the 3rd byte and the 4th byte are broadcast channel transmission indication information, and it defines referring to " CMMB part 1: broadcast channel frame structure, chnnel coding and modulation ".
C interface is through the position of the PSYNC signal indication the type field of SPI.Through the CLK transmission clock, clock is the 10MHz of a system clock to C interface simultaneously,
Interface sequence is as shown in Figure 4, and Fig. 4 forms TS to flow through the sequential format that carries out data transaction in the journey according to an embodiment of the invention.
In the present invention, according to the OFDM mapped mode, confirm corresponding single frequency point transmission data rate, the OFDM frequency number that satellite can transmit;
According to the definition in " CMMB part 1: broadcast channel frame structure, chnnel coding and modulation ", 1 second of physical layer signal is a frame, and every frame is made up of 40 time slots.A time slot is 25 ms.The OFDM modulation system is different, needs information transmitted bit also different among 25 ms.Provided in the table 2 under the different OFDM modulating modes, need be from interface C in the time slot information transmitted byte length.
The QPSK character rate of satellite is 20M, and satellite bandwidth is 25.6M.The maximum transmission rate of satellite channel support is 40Mbps, and each OFDM frequency signal demand satellite channel provides the speed of transmission as shown in table 3.
Table 3 satellite QPSK transmission rate
In the present invention, according to transmission mode, confirm the QPSK transmission data rate.Adopt the satellite bandwidth of 25.6M, the transmission mode that can support is as shown in table 4.
The transmission mode that table 4 satellite QPSK supports
| Transmission mode | The QPSK transmission data rate |
| 3 BPSK frequencies | ＞ |
| 2 QPSK frequencies | ＞ |
| 1 16QAM frequency | ＞ |
| 1 BPSK frequency, 1 QPSK frequency | ＞ |
| 2 BPSK frequencies, 1 QPSK frequency | ＞32Mbps |
In order the data of transmitting in the C interface to be carried out rate-matched and QPSK modulation in strict accordance with the definition of DVB-S satellite transmits standard, need the data format of data interface be changeed.Among the present invention; The TDM modulator also converts each data segment to TS stream; Wherein each data segment converts a series of TS bag to, and each TS comprises synchronization field, error of transmission identification field, time slot mark, transport priority field, PID field, variable field, transmission scrambling control field, self adaptation filling control field, continuity indication counter field, transmission information field and data load field.Each TS bag is made up of 188 bytes, and its definition is as shown in table 5:
Table 5TS stream packing formal definition
| Field | The Bit number | Preset value |
| Sync | 8bit | 47H or B8H |
| The error of |
1 | ? |
| |
1 | ? |
| |
1 | 0 |
| PID number | 13 | 54H |
| Transmission adds around |
2 | 0 |
| Self adaptation is filled |
2 | 01H |
| The continuity indication counter | 4 | ? |
| The transmission information field | 24×8 | ? |
| Data load | 160×8 | ? |
Sync is the synchronous indication of TS bag, and its value is 47H or negate B8H.According to the DVB-S standard-required, in per 8 TS bag, it is B8H that the Sync of a TS bag is arranged, and the Sync of all the other TS bags is 47H.
The error of transmission sign is used to indicate the current TS bag whether to have error of transmission.Generally speaking, the RS decoding circuit by the DVB-S receiver provides this bit information.
Time slot mark: the data load in the current TS bag, during just in time with first TDM frequency signal alignment of a time slot, this bit puts 1.
Transmission priority: this bit puts 1.
PID number: identify the kind of this TS stream, be used for carrying out multiplexing operation with other TS stream.
Variable field: according to the difference of time synchronized field identification, the content of the definition in difference transmission table 6 and the table 7.When the time, synchronization field was designated 0, the content of definition in the transmission table 6; When the time, synchronization field was designated 1, the content of definition in the transmission table 7.
Transmission scrambling control: this 2bit zero setting.
Self adaptation is filled control: this 2bit puts 01, and expression is not filled.
Continuity indication counter: count-up counter, indication TS bag continuity.
The transmission information field: 24 bytes specifically define as shown in table 6.
The data load of data load: TS bag is fixed as 160 bytes.For the frequency signal of BPSK modulation, needing the information transmitted data volume in the time slot just in time is 108 TS bags; For the frequency signal of QPSK modulation, needing the information transmitted data volume in the time slot is 216 TS bags; For the frequency signal of 16QAM, needing the information transmitted data volume in the time slot is 432 TS bags.
Above-mentioned transmission information field is 24 * 8 bits; The time synchronization information that wherein comprises 24 bits; Said time synchronization information is inserted the synchronized counter value of current time in first TS bag of first frequency symbol of each time slot, the respective field in all the other TS bags keeps.
The definition of table 6 transmission information field
Transmission indication information field, frequency field and map field in the table 6, the definition in reference table 1 and the table 2.
The TS packet number: indication current TS bag is the bag of which TS in certain frequency TDM signal in the time slot.For the frequency signal of BPSK modulation, TS Bale No. value 0～95; For the frequency signal of QPSK modulation, TS Bale No. value 0～191; For the frequency signal of 16QAM modulation, TS Bale No. value 0～383.
Time synchronization information is inserted the synchronized counter value of current time in first TS bag of first frequency signal of each time slot, the respective field in all the other TS bags keeps.
Above-mentioned data conversion process can be with reference to shown in Figure 5, and Fig. 5 forms the process sketch map that TS flows through data transaction in the journey according to an embodiment of the invention.
With reference to figure 8, Fig. 8 is the sketch map of bit stream data in interface code flow data and the TS bag according to an embodiment of the invention.Before data transaction; The granting of interface code flow data is in proper order: all the interior OFDM points of first frequency that send first time slot at first successively; Send all interior OFDM points of second frequency of first time slot then, all the OFDM points in the 3rd frequency of first time slot of redispatching, the symbol of so far accomplishing first time slot sends; Send the symbol of second time slot afterwards, until the transmission of the symbol of accomplishing all time slots
After the data transaction; The granting of bit stream data is in proper order in the TS bag: send first frequency that an OFDM of first time slot is ordered at first successively; Send second frequency that an OFDM of first time slot is ordered then, all frequencies that an OFDM of first time slot of redispatching is ordered are so far accomplished the transmission that an OFDM of first time slot is ordered; Send the 2nd OFDM point of first time slot afterwards; Until accomplishing the transmission that all OFDM of first time slot are ordered, carry out the transmission of all frequencies of OFDM point of second time slot again, until the transmission of all frequencies of OFDM point of last time slot.
After having accomplished data transaction, obtain TS stream, according to embodiments of the invention, time synchronized module rise time mark also joins in the time slot indication TS bag of TS stream; TS stream is carried out carry out the QPSK modulation after the empty bag insertion of TS, RS coding and the convolutional encoding at the QPSK modulation module.After will needing the information transmitted data defined form be packaged into TS bag according to the front, carry out RS (204,188) coding and 3/4 convolutional encoding according to the definition among the DVB-S, carry out QPSK then and modulate.QPSK character rate after the modulation is 20M, with it before the data rate of definition do not match, therefore need insert the empty bag of TS and handle, define identical in the definition format of empty bag and the MPEG2 standard.
Fig. 6 is the process sketch map of QPSK modulation according to an embodiment of the invention.
In the present invention, the time synchronized module generates pseudo random sequence as synchronizing sequence.The TDM modulator also comprises the synchronizing signal insert module, and synchronizing sequence is inserted in the QPSK signal, and wherein I, Q two paths of signals insert the synchronizing sequence of homophase.The synchronous code that time synchronized module of the present invention generates is 13 pseudo random sequences; The synchronizing signal insert module is modulated pseudo random sequence I, the addition of Q two paths of signals dot interlace of output simultaneously respectively with QPSK.Said pseudo random sequence is generated by the speed of 13 shift registers with 10M, and generator polynomial is: G (x)=x
13+ x
12+ x
10+ x
9Initial phase in+1,13 registers is 0,0000; 0000,0001, the length of synchronizing sequence is 8191; Continuous 1220 synchronizing sequences of circle transmission in the time in 1 second, wherein first synchronizing sequence negate is mended 6980 0 behind 1220 synchronizing sequences; Be used to supply the time in 1 second, constitute a synchronizing sequence frame.The synchronizing sequence frame can be with reference to figure 7, and Fig. 7 is the structural representation of synchronizing sequence according to an embodiment of the invention.
The mapping of table 7 synchronizing sequence
| Synchronizing sequence mapping output | The pseudo random |
| 1/20 | 1 |
| -1/20 | 0 |
Coincidence counter and synchronizing sequence frame synchronization.Coincidence counter is counted with the speed of 20M, from 0 counting up to 19999999 (just in time corresponding to 1 second time).In the beginning of synchronizing sequence frame, counter makes zero; When the synchronizing sequence frame end, counter reaches maximum.When first TS bag in the time slot arrives, the value in the coincidence counter is written in the variable field part of time synchronized TS bag.Through this coincidence counter, each time synchronized TS bag in can 1 second carries out the precise time location.
After symbol after the QPSK modulation and the above-mentioned synchronizing sequence addition, after shaping, up-conversion, send to satellite through the Ku wave band.
According to the present invention, the synchronization adaptation method of broadcast data in a kind of satellite synchronization distribution network also is provided, comprising:
Through information source multiplexer output broadcast service data;
The broadcast service data of the information source multiplexer being exported with the Stimi exciter carries out chnnel coding, and the symbol after the chnnel coding is divided into two-way output;
Receive first via symbol and carry out OFDM modulation back output; This ofdm signal, and is transmitted this signal frequency conversion by satellite after send to geosynchronous satellite by Ku wave band ground transmitter with the Ku wave band through a time delay module after S-band;
Receive the second road symbol, form orderly TS stream, TS stream is carried out the DVB-S coding, export after carrying out the QPSK modulation again and inserting synchronizing sequence based on the frequency of symbol and time slot; This QPSK signal sends to geosynchronous satellite via Ku wave band ground transmitter with the mode of time division multiplexing tdm, and by satellite the QPSK signal is directly transmitted with the Ku wave band.
Adopt technical scheme of the present invention, can carry out strict Synchronization Control, be beneficial to realize the synchronous adaptation of broadcast data in the satellite synchronization distribution network at the transmitting terminal of satellite synchronization distribution network.
Claims (9)
1. the synchronous adaptation device of broadcast data in the satellite synchronization distribution network comprises:
The information source multiplexer, the output broadcast service data;
The Stimi exciter is connected to the information source multiplexer, and the broadcast service data that the information source multiplexer is exported carries out chnnel coding, and the symbol after the chnnel coding is divided into two-way output;
The OFDM modulator receives first via symbol and carries out OFDM modulation back output; This ofdm signal, and is transmitted this signal frequency conversion by satellite after send to geosynchronous satellite by Ku wave band ground transmitter with the Ku wave band through a time delay module after S-band;
It is characterized in that, also comprise:
The TDM modulator receives the second road symbol, forms orderly TS stream based on the frequency of symbol and time slot, and TS stream is carried out the DVB-S coding, exports after carrying out the QPSK modulation again and inserting synchronizing sequence; This QPSK signal sends to geosynchronous satellite via Ku wave band ground transmitter with the mode of time division multiplexing tdm, and by satellite the QPSK signal is directly transmitted with the Ku wave band.
2. the synchronous adaptation device of broadcast data in the satellite synchronization distribution network as claimed in claim 1; It is characterized in that the second road symbol behind the channel coding sends to the TDM modulator through an interface, wherein; The granting of said interface code flow data is in proper order: all the interior OFDM points of first frequency that send first time slot at first successively; Send all interior OFDM points of second frequency of first time slot then, all the OFDM points in the 3rd frequency of first time slot of redispatching, the symbol of so far accomplishing first time slot sends; Send the symbol of second time slot afterwards, until the transmission of the symbol of accomplishing all time slots.
3. the synchronous adaptation device of broadcast data in the satellite synchronization distribution network as claimed in claim 2; It is characterized in that; The TDM modulator is packaged into a data segment with the symbol of each frequency of said each time slot; Said data segment comprises header fields and content field, and said header fields comprises the field of indicating frequency, mapped mode and message transmission indication respectively;
The TDM modulator also converts each data segment to TS stream; Wherein each data segment converts a series of TS bag to, and each said TS comprises synchronization field, error of transmission identification field, time slot mark, transport priority field, PID field, variable field, transmission scrambling control field, self adaptation filling control field, continuity indication counter field, transmission information field and data load field;
The granting of bit stream data is in proper order in the said TS bag: all OFDM symbols that send first frequency of first time slot at first successively; Send all OFDM symbols of second frequency of first time slot then; Redispatch all OFDM symbols of the 3rd frequency of first time slot; OFDM symbol until accomplishing all frequencies of first time slot sends, and order all OFDM symbols of carrying out second all frequencies of time slot send according to this again, until all OFDM points transmissions of all frequencies of last time slot.
4. the synchronous adaptation device of broadcast data in the satellite synchronization distribution network as claimed in claim 3; It is characterized in that; Said transmission information field is 24 * 8 bits; The time synchronization information that wherein comprises 24 bits, said time synchronization information are inserted the synchronized counter value of current time in first TS bag of first frequency symbol of each time slot, the respective field in all the other TS bags keeps.
5. the synchronous adaptation device of broadcast data is characterized in that in the satellite synchronization distribution network as claimed in claim 4,
According to the OFDM mapped mode, confirm corresponding single frequency point transmission data rate, the OFDM frequency number that satellite can transmit;
Wherein, the corresponding single frequency point transmission data rate of BPSK is＞8Mbps that the OFDM frequency number that satellite can transmit is 3; The corresponding single frequency point transmission data rate of QPSK is＞16Mbps that the OFDM frequency number that satellite can transmit is 2; The corresponding single frequency point transmission data rate of 16QAM is＞32Mbps that the OFDM frequency number that satellite can transmit is 1;
According to transmission mode, confirm the QPSK transmission data rate;
Wherein, 3 corresponding QPSK transmission data rates of BPSK frequency transmission mode are＞24Mbps; 2 corresponding QPSK transmission data rates of QPSK frequency transmission mode are＞32Mbps; 1 corresponding QPSK transmission data rate of 16QAM frequency transmission mode is＞32Mbps; 1 BPSK frequency, 1 corresponding QPSK transmission data rate of QPSK frequency transmission mode is＞24Mbps; 2 BPSK frequencies, 1 corresponding QPSK transmission data rate of QPSK frequency transmission mode is＞32Mbps.
6. the synchronous adaptation device of broadcast data is characterized in that in the satellite synchronization distribution network as claimed in claim 5,
Said TDM modulator carries out the empty bag insertion of TS to TS stream and carries out rate-matched,
Said TDM modulator comprises the DVB-S encoder, carries out the DVB-S coding, comprises carrying out RS (204,188) coding and 3/4 convolutional encoding;
Said TDM modulator also comprises the QPSK modulation module, and TS stream is carried out the QPSK modulation.
7. the synchronous adaptation device of broadcast data is characterized in that in the satellite synchronization distribution network as claimed in claim 6,
Said TDM modulator also comprises the time synchronized module, and the rise time mark also joins in the time slot indication TS bag of TS stream.
8. the synchronous adaptation device of broadcast data is characterized in that in the satellite synchronization distribution network as claimed in claim 7,
Said time synchronized module generates pseudo random sequence as synchronizing sequence;
Said TDM modulator also comprises the synchronizing signal insert module, and synchronizing sequence is inserted in the QPSK signal, and wherein I, Q two paths of signals insert the synchronizing sequence of homophase.
9. the synchronization adaptation method of broadcast data in the satellite synchronization distribution network comprises:
Through information source multiplexer output broadcast service data;
The broadcast service data of the information source multiplexer being exported with the Stimi exciter carries out chnnel coding, and the symbol after the chnnel coding is divided into two-way output;
Receive first via symbol and carry out OFDM modulation back output; This ofdm signal, and is transmitted this signal frequency conversion by satellite after send to geosynchronous satellite by Ku wave band ground transmitter with the Ku wave band through a time delay module after S-band;
Receive the second road symbol, form orderly TS stream, TS stream is carried out the DVB-S coding, export after carrying out the QPSK modulation again and inserting synchronizing sequence based on the frequency of symbol and time slot; This QPSK signal sends to geosynchronous satellite via Ku wave band ground transmitter with the mode of time division multiplexing tdm, and by satellite the QPSK signal is directly transmitted with the Ku wave band.
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