CN101212392B - Mobile multimedia broadcast satellite distribution data encapsulation and synchronization method - Google Patents
Mobile multimedia broadcast satellite distribution data encapsulation and synchronization method Download PDFInfo
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Abstract
The invention discloses a method of encapsulation and synchronization for distribution data in a mobile multimedia broadcast satellite. The invention comprises the following processes: the date quantity of a transmission frame is determined; the number of symbol bytes in a timeslot of a single frequency point under the modulation of narrowest bandwidth and the symbol number with least transmission are taken as a frame; the data in the frame is encapsulated into a packet with a reservation format. The data of each frame is encapsulated into an initial packet and a plurality of data transmission packets; wherein, the initial packet comprises controlling information and the controlling information comprises the transmission characteristics and synchronization information of the frame; according to a selected bandwidth, the transited data of different frequency points in the identical timeslot is encapsulated into a series of transmission packets in the frame unit in frequency, wherein, the different frequency points in the identical timeslot can use different modulation and have different quantity of transmission frames; the obtained series of data packets carries out a scrambling code, an RS coding, a convolution interweaving, a convolution coding, a QPSK mapping, a synchronization information insertion and a pilot signal insertion.
Description
Technical field
The present invention relates to the mobile multimedia broadcast satellite dissemination system, more particularly, relate to a kind of mobile multimedia broadcast satellite distribution data encapsulation and method for synchronous.
Background technology
Mobile multimedia broadcast system covers, supports high-quality to fix or the multimedia digital that move to receive is looked, audio frequency and data service broadcast service in 30MHz～3000MHz frequency range for the user provides on a large scale.Wherein, programme information can divide two paths of signals to transmit: after 1) source of program signals was carried out the OFDM modulation by the mobile multimedia modulator, directly the S-band broadcast channel provided large tracts of land broadcasting to cover to the user via satellite.2) source of program signals is carried out program distribution through data distribution network to each land-based repeaters simultaneously; And after carrying out OFDM modulation again by land-based repeaters; Under specific synchronous condition, on S-band, broadcast, the direct broadcast singal of satellite S-band is replenished covering.
Because the transmission delay that China is vast in territory, satellite-signal arrives 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 mobile multimedia broadcast system; Therefore; How to overcome transmission delay, accomplish that transmitting synchronous is a problem that extremely receives publicity.
Summary of the invention
The present invention aims to provide a kind of mobile multimedia broadcast satellite distribution data encapsulation and method for synchronous; Can will pass through chnnel coding and combine certain control information to form the transmission package of specific format, provide to each ground forwarding modulator by central modulator with orderly, no ambiguity ground with the CMMB symbol data that interweaves.
According to the present invention, a kind of mobile multimedia broadcast satellite distribution data encapsulation and method for synchronous are provided, wherein; 1 second the signal of standard regulation of CMMB is divided into the time slot of predetermined quantity; Can adopt different modulation modes in each time slot, the symbol data that in a time slot, transmits is as a transmission unit, and; Said CMMB is with different bandwidth for transmission; The frequency of the corresponding varying number of different bandwidth, said method comprises: in the transmission package of predetermined format, the data encapsulation of said each frame becomes an initial package and several data transmission with the data encapsulation in the frame; Comprise control information in the wherein said initial package, said control information comprises the transmission feature and the synchronizing information of this frame; According to the bandwidth of being selected for use; Data with different frequent points transmission in the same time slot are that unit is encapsulated in a series of said transmission package with said frame successively; Wherein, different frequent points can adopt different modulation modes in the same time slot, and has the transmission frame of varying number; A series of transmission package for being obtained are divided into array, and each group has the transmission package of predetermined quantity, and first byte of first transmission package of each group is carried out inversion operation, insert synchronizing information; The transmission package that to carry out behind the inversion operation is carried out scrambler, transmission package and local scrambler sequence is carried out XOR handle; The transmission package of handling through scrambler is carried out the RS coding; To carrying out the byte convolutional interleave through the data behind the RS coding; Convolutional encoding is carried out in output to convolutional interleave; Bit stream to convolutional encoding output carries out the QPSK mapping; Data to after the QPSK mapping are inserted synchronizing information, and said synchronizing information comprises the two-way binary pseudo-random sequence, wherein raise the time encoding information that is shaped in first via binary pseudo-random sequence, and the modulation intelligence of the second tunnel binary pseudo-random sequence keeps; Insert pilot signal.
According to one embodiment of the invention, 1 second signal of the standard of said CMMB regulation is divided into 40 time slots, each time slot 25ms; Said CMMB comprises two kinds of signal bandwidth: 2MHz, corresponding 12 frequencies, and 8MHz, corresponding 3 frequencies; The standard of said CMMB adoptable modulation system in each time slot comprises: BPSK, QPSK, 16QAM.
According to one embodiment of the invention, for the 2MHz bandwidth, the symbol quantity of each frequency single time slot is 27648 bits, wherein, uses the BPSK modulation system, and the information bit of single time slot is 27648 bits, and the symbol-byte number of single time slot is 3456 bytes; Use the QPSK modulation system, the information bit of single time slot is 55296 bits, and the symbol-byte number of single time slot is 6912 bytes; Use the 16QAM modulation system, the information bit of single time slot is 110592 bits, and the symbol-byte number of single time slot is 13824 bytes;
For the 8MHz bandwidth, the symbol quantity of each frequency single time slot is 138240 bits, wherein, uses the BPSK modulation system, and the information bit of single time slot is 138240 bits, and the symbol-byte number of single time slot is 17280 bytes; Use the QPSK modulation system, the information bit of single time slot is 276480 bits, and the symbol-byte number of single time slot is 34560 bytes; Use the 16QAM modulation system, the information bit of single time slot is 552960 bits, and the symbol-byte number of single time slot is 69120 bytes;
Wherein, the data volume of a frame is 3456 bytes, and therefore, when adopting the 2MHz bandwidth, the quantity of the transmission frame that each frequency is corresponding is respectively: the BPSK modulation system is 1 frame; The QPSK modulation system is 2 frames; The 16QAM modulation system is 4 frames; When adopting the 2MHz bandwidth, the quantity of the transmission frame that each frequency is corresponding is respectively: the BPSK modulation system is 5 frames; The QPSK modulation system is 10 frames; The 16QAM modulation system is 20 frames.
According to one embodiment of the invention, said transmission package meets GB/T 17975.1 standards, and each transmission package comprises 188 bytes, comprises the transmission packet header of 4 bytes and the data field of 184 bytes; Wherein,
Said method forms the initial package with following field, comprising: transmission packet header, and 32 bits, the definition in this transmission packet header meets GB/T 17975.1 standards; Wherein, pid value is 0x05A0, and load cell is initial to be designated as 1, and it is initial package that the initial indication of pid value and load cell combines this transmission package of explanation, and the transmission priority value is 1, and transmission scrambling controlling value is made as 00, and adaptive section controlling value is 01; Control field, 40 bytes, 320 bits comprise: symbol transmission frame initial package indicates, 16 bits; Reserved field, 8 bits; The configuration change indication, 1 bit meets GY/T 220.1-2006 standard; The byte interleaver device sync id, 1 bit meets GY/T 220.1-2006 standard; Timeslot number, 6 bits, it is accurate to meet GY/T 220.1-2006 table; Frequency point number, 8 bits are represented which the frequency emission of attribution data in this symbol transmission frame; The channel width indication, 1 bit indicates that current data belongs to the signal bandwidth of frequency, wherein 0 representes 2MHz, 1 expression 8MHz; The expansion control information indicating, 1 bit, when being made as 1, the expansion control information that comprises ground forwarding station identification numbers, through-put power, output frequency mask in the initial bag of expression current sign transmission frame and postpone to finely tune when being made as 0, representes that corresponding field is meaningless; Mapped mode, 6 bits represent that the data in the current transmission frame are shone upon in which way; Distribution mode, 6 bits represent current symbol data is sent to each ground based repeater with which kind of distribution mode; The transmission package numbering, 10 bits, first data transmission in the expression current sign transmission frame belongs to which transmission package in the whole time slot; Synchronized timestamp, 32 bits, the time slot that expression current sign transmission frame is belonged to is at the x time of land-based repeaters; The ground forwarding station identification numbers, 32 bits are in order to each ground based repeater of unique identification; Through-put power, 8 bits, in order to control the power output of each ground based repeater, wherein, 0x00-0xff representes 0% to 100% relative power; Output frequency mask, 16 bits are controlled the information whether each ground based repeater sends specific frequency, and wherein, high 4 bits keep definition, and low 12 bits can be used to represent which number frequency whether launch, 1 expression emission, 0 expression is not launched; Postpone to finely tune, 16 bits, in order to notify specific ground based repeater's fine setting metadata cache time, unit of adjustment is the timeslice of a 100ns, wherein, also comprises the bit of indication adjustment direction, and 0 expression shifts to an earlier date, and 1 expression is delayed; Reserved field, 152 bits; Symbol data, 1152 bits, transmission is through chnnel coding and the mobile multi-media broadcasting data that interweaves;
Said method also forms the data transmission with following structure, comprising: transmission packet header, and 32 bits, the definition in this transmission packet header meets GB/T 17975.1 standards; Wherein, to be that 0x054, load cell are initial be designated as 0 to pid value, and the transmission priority value is 1, and transmission scrambling controlling value is made as 00, and adaptive section controlling value is 01; Symbol data, 1472 bits, transmission is through chnnel coding and the mobile multi-media broadcasting data that interweaves.
According to one embodiment of the invention, first byte of said first transmission package to each group is carried out inversion operation, and first byte of first transmission package of this each group is a sync byte, and synchronizing information is inserted in this sync byte negate.
According to one embodiment of the invention; The said transmission package that will carry out behind the inversion operation carry out scrambler, to the transmission package of handling through scrambler carry out the RS coding, to carrying out the byte convolutional interleave through the data behind the RS coding and the step that convolutional encoding is carried out in the output of convolutional interleave being met GS/T 17700 standards; Wherein: in the said scrambler operation; The local scrambler sequence that generates is 15 rank shift register pseudo-random binary sequences, and generator polynomial is: G (x)=x
15+ x
14+ 1, the initial value of register from a high position to the low level is: 000000010101001, and wherein, the sync byte in the transmission package is not participated in the scrambler operation, but in the sync byte stage, pseudo-random binary sequence generates uninterrupted; In the said operation of carrying out RS coding, adopt RS (204,188) coding that the transmission package behind the scrambler is carried out the RS coding; Said carrying out in the byte convolutional interleave, interleave depth is I=12, and the shift register degree of depth that interweaves is M=17, and the delay of whole interweaving-deinterleaving is 2224 bytes; Said carrying out in the convolutional encoding; At first constraint length being carried out in the output of convolutional interleave is 7 convolutional encoding; The code check of coding is 1/2, and then punch operation is carried out in output to convolutional encoding, and supported convolutional encoding code check is: 1/2,2/3,3/4,5/6,7/8.
According to one embodiment of the invention, said bit stream to convolutional encoding output carries out the QPSK mapping and comprises the QPSK mapping of carrying out based on Gray code; QPSK character rate after the modulation is 20M, and the QPSK transmission rate is higher than actual traffic data speed, therefore carries out the plug hole bag and handles, and the definition format of empty bag meets GB/T 17975.1 standards.
According to one embodiment of the invention; Said synchronizing information is the binary pseudo-random sequence that two route 20M system clocks drive; Wherein raise the time encoding information that is shaped in first via binary pseudo-random sequence, the modulation intelligence on the second tunnel binary pseudo-random sequence keeps; First via binary pseudo-random sequence is produced by linear feedback shift register, and generator polynomial is: x
13+ x
4+ x
3+ x+1, shift register initial value are 0110101010010; The second tunnel binary pseudo-random sequence is produced by linear feedback shift register, and generator polynomial is: x
18+ x
17+ x
16+ x
13+ x
12+ x
10+ x
8+ x
6+ x
3+ x+1, shift register initial value are 011010101001010101.
According to one embodiment of the invention; Each pseudo-code periodic modulation one bit time code data on the first via binary pseudo-random sequence; Temporal information is encoded to fixedly frame length 256 bits, and said method forms following temporal information coding: flag of frame, 16 bits; Indicate this frame to begin, form by 1110101110010000; The time cycle counting, 32 bits are represented this frame first bit 1 relative system zero T constantly
0Count value, be used for ancillary terrestrial and augment repeater system and realize synchronization acquistion; Secondary planet frequency-difference, 32 bits, the exemplary frequency deviation values of expression current time satellite forward signal, unit is 0.001Hz, is used for the ground supplement repeater system with the carrier frequency correction of forward signal frequently; The PN reset cycle indicates, 6 bits, and the reset cycle of the expression first via binary pseudo-random sequence and the second tunnel binary pseudo-random sequence, reset cycle indication field value is from 0x00～0x3F, and correspondence is 1 second to 64 seconds respectively; The sign that resets, 1 bit, value is 1 o'clock, first first via binary pseudo-random sequence original position of expression current time coded frame is a reset position; Pilot tone is inserted and is indicated, 1 bit, and value is not insert pilot tone in 0 expression signal; Value is to have inserted pilot tone in 1 expression signal, and in this step, pilot tone defines as follows: I road: A, and 0 ,-A, 0 ... the .Q road: 0, A, 0 ,-A .... the pilot level A on each branch road is 1/20 of a data level; Information category and data segment, 152 bits are preserved for follow-up business and carry other system information; CRC, 16 bits are used for the information coding CRC of this frame except that flag of frame, and the CRC generator polynomial is: x
16+ x
12+ x
5+ 1;
Wherein, the content during zero moment indicated according to the PN reset cycle is by a second cycle reset, and the content of the first via binary pseudo-random sequence and the second tunnel binary pseudo-random sequence shift register is initial value when resetting; The speed of each branch road of data QPSK symbols streams is identical with system-clock rate; And it is synchronous with system clock; The compound employing stacked system of the signal of data and time binary pseudo-random sequence sign indicating number; The binary pseudo-random sequence coded signal level of I, each branch road of Q is 1/20 of data signal levels, first via binary pseudo-random sequence and the stack of I road signal, the second tunnel binary pseudo-random sequence and the stack of Q road signal.
Adopt technical scheme of the present invention, can will pass through chnnel coding and combine certain control information to form the transmission package of specific format, provide to each ground forwarding modulator by central modulator with orderly, no ambiguity ground with the CMMB symbol data that interweaves.
Description of drawings
In the present invention, identical Reference numeral is represented identical characteristic all the time, wherein,
Fig. 1 is used to realize that mobile multimedia broadcast satellite distribution data of the present invention encapsulates and the structure chart of the mobile multimedia broadcast satellite dissemination system of method for synchronous;
Fig. 2 is according to the mobile multimedia broadcast satellite distribution data encapsulation of one embodiment of the invention and the flow chart of method for synchronous;
Fig. 3 is the frame assumption diagram according to the transmission frame of one embodiment of the invention;
Fig. 4 is the schematic flow sheet that inserts according to synchronizing information in the method for one embodiment of the invention;
Fig. 5 carries out QPSK mapped constellation figure according to the output bit flow to convolutional encoding in the method for one embodiment of the invention;
Fig. 6 a is the structure chart according to the sequence generator of the first via binary pseudo-random sequence of one embodiment of the invention;
Fig. 6 b is the structure chart according to the sequence generator of the second tunnel binary pseudo-random sequence of one embodiment of the invention.
Embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
The mobile multi-media broadcasting data dissemination system
When data distribution network adopts the satellite transmits mode; Mobile multi-media broadcasting data dissemination system structure is as shown in Figure 1, and multimedia broadcast data dissemination system 100 shown in Figure 1 can be realized mobile multimedia broadcast satellite distribution data encapsulation of the present invention and method for synchronous.
Continuation is with reference to figure 1; Data sync behind the channel coding is sent to TDM exciter 126; After data encapsulation format conversion and QPSK modulation (GS/T 17700 standards are followed in strictness) and inserting time synchronization information, be converted to the Ku wave band by the 2nd Ku wave band frequency conversion amplifier 128 and send to synchronous satellite 104.Satellite 104 directly sends to land-based repeaters 106 with the Ku wave band with this TDM modulation signal.Land-based repeaters 106 is carried out demodulation with the TDM modulation signal that receives, and carries out the OFDM modulation again, under specific synchronous condition, on S-band, broadcasts, and the direct S-band broadcast singal of satellite is replenished covering.Terrestrial user receiver 108 receives signal the replenishing as the S-band signal that sends for satellite 104 of being transmitted by land-based repeaters 106.
In the OFDM exciter 122 of the mobile multimedia modulator 102 of Fig. 1, added a Postponement module.After the adding of this module will guarantee that the professional information source information in the identical moment is modulated into ofdm signal and QPSK signal respectively; On the delivery time of space, satisfy a regular time delay, this delay will be by land-based repeaters in order to the signal Synchronization between satellite S-band broadcast singal and the transponder S-band broadcast singal.
Mobile multimedia broadcast satellite distribution data encapsulation and method for synchronous
The present invention provides a kind of mobile multimedia broadcast satellite distribution data encapsulation and method for synchronous, with reference to figure 2, shows its flow chart; In this method 200,1 second signal of CMMB standard regulation is divided into the time slot of predetermined quantity, can adopt different modulation modes in each time slot; The symbol data that in a time slot, transmits is as a transmission unit, and multimedia broadcasting is with different bandwidth for transmission; The frequency of the corresponding varying number of different bandwidth, this method 200 comprises:
202. confirm the data volume of a transmission frame; As a frame, the symbol-byte number in time slot of the single frequency point of other bandwidth or modulation system is the integral multiple of a frame with the symbol-byte number in time slot of single frequency point under the modulation system of narrow bandwidth, the minimum symbol quantity of transmission;
204. in the transmission package of predetermined format, the data encapsulation of each frame becomes an initial package and several data transmission, wherein comprises control information in the initial package with the data encapsulation in the frame, control information comprises the transmission feature and the synchronizing information of this frame;
206. according to the bandwidth of being selected for use; Data with different frequent points transmission in the same time slot are that unit is encapsulated in a series of said transmission package with the frame successively; Wherein, different frequent points can adopt different modulation modes in the same time slot, and has the transmission frame of varying number;
208. a series of transmission package for being obtained are divided into array, each group has the transmission package of predetermined quantity, and first byte of first transmission package of each group is carried out inversion operation, inserts synchronizing information;
210. the transmission package that will carry out behind the inversion operation is carried out scrambler, and transmission package and local scrambler sequence are carried out the XOR processing;
212. the transmission package of handling through scrambler is carried out the RS coding;
214. to carrying out the byte convolutional interleave through the data behind the RS coding;
216. convolutional encoding is carried out in the output to convolutional interleave;
218. the bit stream to convolutional encoding output carries out the QPSK mapping;
220. the data to after the QPSK mapping are inserted synchronizing information, synchronizing information comprises the two-way binary pseudo-random sequence, wherein raises the time encoding information that is shaped in first via binary pseudo-random sequence, and the modulation intelligence of the second tunnel binary pseudo-random sequence keeps;
222. insertion pilot signal.
Following mask body is introduced each step among the present invention.
The encapsulation of distributing data
According to the CMMB standard, stipulated that the signal in 1 second is divided into 40 time slots, each time slot 25ms.In each time slot, all can adopt different modulation modes, comprise: BPSK, QPSK, 16QAM.When carrying out byte and Bit Interleave, be cycling element equally with the time slot.Receiver can only select the signal of particular time-slot to receive in order under the situation of low-power consumption, to work.Based on the such characteristics of whole mobile multimedia broadcast satellite dissemination system, with the symbol data of a time slot unit, i.e. a transmission unit as a conveying.
For CMMB, spendable total bandwidth is 25MHz.According to the present invention.In mobile multimedia broadcast system, two kinds of signal bandwidth: 2MHz and 8MHz have been stipulated.Consider the total bandwidth of 25MHz, adopting the various signals bandwidth is the frequency that will have varying number, and when bandwidth was 2MHz, the frequency number was 12, and when bandwidth was 8MHz, the frequency number was 3.System has stipulated 3 kinds of modulation system: BPSK, QPSK and 16QAM simultaneously.Thus, in a time slot, the various modulation configuration data quantity transmitted of can are as shown in the table:
Table 1: the symbol data amount in the mobile multimedia broadcast system single time slot
For the convenience of transmitting; The present invention has defined transmission frame; Be referred to as the TDM frame; Data volume in transmission frame confirms as follows, and as a frame, the interior symbol-byte number of time slot of the single frequency point of other bandwidth or modulation system is the integral multiple of a frame with the symbol-byte number in time slot of single frequency point under the modulation system of narrow bandwidth, the minimum symbol quantity of transmission.
With reference to top table 1, select the 2MHz bandwidth, the symbol-byte number of single frequency point single time slot transmission is as the volume of transmitted data of a frame under the BPSK modulation system, and promptly a frame is 3456 bytes.Accordingly, can obtain: during the 2MHz bandwidth, adopt various modulation systems, the data volume of each frequency is following in a time slot: BPSK is that 1 frame, QPSK are that 2 frames, 16QAM are 4 frames.During the 8MHz bandwidth, the data volume of each frequency is following in a time slot: BPSK is that 5 frames, QPSK are that 10 frames, 16QAM are 20 frames.
For each transmission frame; Need these 3456 bytes be encapsulated in the transmission package and transmit, according to the present invention, the form and GB/T 17975.1 operating suchs of symbol data transmission encapsulation; According to GB/T 17975.1 standards, the size of each transmission package is 188 bytes.For a frame 3456 bytes, need to use 19 transmission package.So the present invention is encapsulated in the information data of per 3456 bytes in 19 data transmission: each data transmission is 188 bytes, wherein 4 byte is transmission packet header, and all the other 184 bytes are data field.
Fig. 3 is the frame assumption diagram according to the transmission frame of one embodiment of the invention; As shown in Figure 3; 19 transfer of data bags are formed a symbol transmission frame; Wherein first data field that is numbered 184 bytes of 0 data transmission partly comprises the control information of 40 bytes, is called symbol transmission frame initial package.The data field part of all the other 18 transmission package is only carried symbol data, is called the symbol data transmission package.So the data of a frame are broken down into 3456=144+18 * 184, promptly in initial package, comprise the symbol data of 144 bytes, in the follow-up data transmission, each comprises the symbol data of 184 bytes.Remaining 40 bytes of the data field part of initial package are used to transmit control word.
Transmission packet structure
The transmission package of symbol data and GB/T 17975.1 transport packet format are compatible, are made up of 4 byte packet header and 184 byte count data field.According to the definition of above-mentioned symbol transmission frame, the symbol data transmission package is divided into two types, and one type is symbol transmission frame initial package, and it comprises control information and symbol data; Another kind of is the symbol data transmission package, and it comprises symbol data.
The structure of data transmission is following among the present invention, shown in the reference table 2:
Table 2: symbol data transmission package
| Grammer | Figure place | Memonic symbol |
| symbol_data_transport_packet(){ | ? | ? |
| transport_packet_header | 32 | bslbf |
| symbol_data | 1472 | bslbf |
Transmission packet header Transport_packet_header: the definition in transmission packet header meets GB/T 17975.1 standards, chapters and sections 2.4.3.2 table 3 and table 4.
The pid value of symbol data transmission package is made as 0 * 54.
The initial indication of load cell is made as 0.
The transmission priority value is nonsensical for the symbol data transmission package, is made as 1.
Transmission scrambling controlling value is made as 00 (not scrambling).
Adaptive section controlling value is 01 (only transmission payload).
All the other each parameter values all can be with reference to GB/T 17975.1, chapters and sections 2.4.3.2.
Symbol data: through chnnel coding and the mobile multi-media broadcasting data that interweaves.Each byte can comprise 8 BPSK symbols, or 4 QPSK symbols, or 2 16QAM symbols.Pass the LSB of symbol data in the byte earlier.
The structure of transmission initial package is following among the present invention, shown in the reference table 3:
Table 3: symbol transmission frame initial package
Transmission packet header Transport_packet_header: the definition in transmission packet header meets GB/T 17975.1 standards, chapters and sections 2.4.3.2 table 3 and table 4.
The initial indication of load cell is made as 1, and all the other definition are identical with the symbol data transmission package.
Symbol transmission frame identification marking: be defined as 0 * 05A0.In conjunction with the initial indication of load cell, explain that together current pack is a symbol transmission frame initial package.
Configuration change indication configuration_change_indicator: referring to GY/T 220.1-2006 table 7.
Byte interleaver device sync id Byte_interleaver_sync_indicator: referring to GY/T 220.1-2006 table 7.
Timeslot number time_slot_number: referring to GY/T 220.1-2006 table 7.
Frequency point number channel_number: represent which the frequency emission of attribution data in this symbol transmission frame.
Channel width indication channel_bandwidth_indicator: indicate the signal bandwidth of current data ownership frequency, 0 is 2MHz, and 1 is 8MHz.
Expansion control information indicating e * tended_control_info_indicator:, comprise expansion control information such as ground forwarding station identification numbers ground_station_id, through-put power transmission_power, output frequency mask output_channel_mask and delay fine setting delay_fine_tune in the initial bag of expression current sign transmission frame when being made as 1.When being made as 0, represent that corresponding field is meaningless.
Mapped mode mapping_mode: represent that the data in the current transmission frame shine upon in which way, specific definition is the table 4 of face as follows:
Table 4: mapped mode definition list
| Field value | Mapped |
| 0×00 | |
| 0×01 | |
| 0×02 | |
| 0×03-0×3f | Keep |
Distribution mode distribution_mode: represent current symbol data is sent to each ground based repeater with which kind of distribution mode, and specific definition is the table 5 of face as follows:
Table 5: distribution mode definition list
| Field value | Mapped |
| 0×00 | Satellite DVB- |
| 0×01 | Satellite DVB- |
| 0×02 | The |
| 0×03 | Ground DVB-T/ |
| 0×04 | Ground T- |
| 0×05 | |
| 0×06-0×3f | Keep |
Transmission package code T S_packet_number: first data transmission in the expression current sign transmission frame belongs to which transmission package in the whole time slot.Detailed span is the table 6 of face as follows:
Table 6: transmission package numbering list of values
| Signal bandwidth | Mapped mode | Transmission package numbering | |
| 2MHz | BPSK | ||
| 0 | |||
| | QPSK | 0、19 | |
| | 16QAM | 0、19、38、57 | |
| | BPSK | 0、19、38、57、76 | |
| | QPSK | 0、19、38、57、76、95、114、133、152、 171 | |
| | 16QAM | 0、19、38、57、76、95、114、133、152、 171 190、209、228、247、266、285、304、 323、342、361 |
Synchronized timestamp synchronization_time_stamp: the time slot that expression current sign transmission frame is belonged to is at the x time of land-based repeaters.Each land-based repeaters can be inserted the reference frequency and a second periodic signal that synchronizing information recovers 10MHz according to the TDM modulator.What time synchronized was deposited in stabbing is a Counter Value, and this Counter Value is system time Counter Value and system transmissions total retardation value sum.A second periodic signal that comprises in time synchronized stamp and the synchronizing information matches, and has indicated the absolute time that this time slot is transmitted in land-based repeaters.
Ground forwarding station identification numbers ground_station_id: can be in order to each ground based repeater of unique identification.
Through-put power transmission_power: can be in order to control the power output of each ground based repeater.0 * 00-0 * ff representes 0% to 100% relative power.
Output frequency mask output_channel_mask: control the information whether each ground based repeater sends specific frequency.High 4 bits in 16 bits keep definition, and low 12 bits can be used to represent which number frequency whether launch, ' 1 ' expression emission, and ' 0 ' expression is not launched.For example: ' 0 * 0003 ', represent No. 0 and No. 1 frequency emission that all the other frequencies are closed; ' 0 * 0fff ', open all frequencies of expression; ' 0 * 0000 ', all frequencies are closed in expression.
Postpone fine setting delay_fine_tune: in order to notify specific ground based repeater's fine setting metadata cache time, unit of adjustment is still the timeslice of a 100ns.Msb representes to adjust direction in 16 bits, ' 0 ' expression in advance, ' 1 ' expression is delayed, all the other bits are represented the value adjusted.
Symbol data symbol data: identical with the symbol data definitional part of symbol data transmission package.
The data encapsulation of same time slot
The front said that according to the present invention, transmission unit was to be unit with the time slot.A time slot is 25ms, according to the difference of selected bandwidth, in a time slot, has the frequency of varying number; Such as, select the 2MHz bandwidth, the frequency number is total bandwidth (25MHz)/2MHz; Be 12 after rounding, corresponding, if select the 8MHz bandwidth; The frequency number is total bandwidth (25MHz)/8MHz, is 3 after rounding.Because the unit of transmission is a time slot, therefore need the data of all frequencies in the same time slot be packaged into together continuous transmission package and transmits.Moreover, according to the present invention, in the different frequent points of same time slot; Can adopt different modulation modes separately; Thereby the data volume of different frequent points is inequality, such as, as top said; Adopting 2MHz bandwidth B PSK is the data volume of 1 frame, and selects for use 8MHz bandwidth 16QAM just to have the data volume of 20 frames.
Thus, the present invention provides following mode that the data encapsulation of different frequent points in the time slot is become continuous, orderly transmission package, reference table 7:
The encapsulation of different frequent points order in the same time slot of table 7
| TS0 Freq0 | …… | TSn Freq0 | TS0 Freq1 | …… | TSn Freq1 | …… | TS0 Freqn | …… | TSn Freqn |
At first, the data of the first frequency Freq0 are encapsulated, begin from the first frame TS0 of this frequency, until last frame TSn;
Afterwards, successively to follow-up frequency, the second frequency Freq1 etc. encapsulates, until last frequency Freqn.
Illustrate, instance 1:8MHz bandwidth, 3 frequencies, modulation system is followed successively by BPSK, QPSK and 16QAM, encapsulation order as follows:
At first, the first frequency Freq0, modulation system is BPSK, data volume is 5 frames, at first encapsulate, to the packaged type of each frame wherein can with reference to before described content.After the encapsulation of first frequency finishes, the second frequency Freq1 is encapsulated, modulation system is QPSK, and data volume is 10 frames.Be the 3rd frequency Freq2 at last, modulation system is 16qAM, and data volume is 20 frames.Like this, the data volume that this time slot comprises altogether is 35 frames, is encapsulated into 665 continuous transmission package altogether.
Instance 2, the 2MHz bandwidth, 12 frequencies, modulation system does, all is QPSK, encapsulation order as follows:
At first, the first frequency Freq0, modulation system is QPSK, data volume is 2 frames.Afterwards, be followed successively by the second frequency Freq1, the 3rd frequency Freq2... encapsulates until the 12 frequency Freq11.Each frequency point data amount all is 2 frames.Like this, the data volume that this time slot comprises altogether is 24 frames, is packaged into 456 continuous transmission package altogether.
So far, accomplished the step 202-206 in the above-mentioned method 200, the data of all frequencies in the time slot have been packaged in an orderly manner the continuous transmission package of some.
The insertion of synchronizing information
For the continuous transmission package (being the data in a series of TDM frames) of the some that obtains in the superincumbent step, then carry out following processing, carry out RS (204 according to the definition in GS/T 17700 standards; 188) coding and convolutional encoding are carried out the QPSK modulation then, and the QPSK character rate after the modulation is 20M; The QPSK transmission rate is higher than actual traffic data speed; Therefore need carry out the plug hole bag and handle, the definition format of empty bag meets GB/T 17975.1 standards, and these are handled corresponding to the step 208-222 in the method 200; The flow process of this part also can comprise with reference to shown in Figure 4:
The insertion of synchronizing information (synchronous head negate):
For a series of transmission package of top acquisition, per 8 transmission package are divided into one group, wherein first byte of first transmission package of each group (sync byte 47H) is carried out inversion operation.
The scrambler operation:
Transmission package after the synchronous head negate is carried out XOR with the local scrambler sequence that generates to be handled.Local scrambler is 15 rank shift register pseudo-random binary sequences (PRBS), and generator polynomial is:
G(x)＝x
15+x
14+1
The initial value of register from a high position to the low level is: 000000010101001.Sync byte is not participated in the scrambler operation, but in the sync byte stage, the PRBS sequence generates uninterrupted.Scrambler generative circuit first bit place behind reverse sync byte B8H resets, so the generation cycle of PRBS is 1503 bytes.
The RS coding:
Adopt RS (204,188) coding that the MPTS behind the scrambler (TS stream) is protected.RS (204,188) is the stage sign indicating number of original RS (255,239).The code element of RS sign indicating number is taken from GF (255), and the territory generator polynomial is:
p(x)＝x
8+x
4+x
3+x
2+1
RS sign indicating number generator polynomial is:
G (x)=(x+ λ
0) (x+ λ
1) (x+ λ
2) .... (x+ λ
15) λ=02HEX wherein
The byte convolutional interleave:
Data behind the RS coding are carried out the byte convolutional interleave.Interleave depth is I=12, and the shift register degree of depth that interweaves is M=17.The delay of whole interweaving-deinterleaving is 2224 bytes (11 transmission package).
Convolutional encoding:
At first constraint length being carried out in the output of convolutional interleave is 7 convolutional encoding, and the code check of coding is 1/2.Then punch operation is carried out in output to convolutional encoding, and supported convolutional encoding code check is: 1/2,2/3,3/4,5/6,7/8.
The QPSK mapping:
Output bit flow to convolutional encoding carries out the QPSK mapping based on Gray code, and mapped constellation figure is as shown in Figure 5.
Synchronizing information is inserted:
Between synchronizing signal be the binary pseudo-random sequence that two route 20M system clocks drive, the first via binary pseudo-random sequence PN1 and the second tunnel binary pseudo-random sequence PN2 wherein raise the time encoding information that is shaped at PN1, the last modulation intelligence of PN2 keeps.
PN1 is produced by the linear feedback shift register shown in Fig. 6 a, and generator polynomial is: x
13+ x
4+ x
3+ x+1, shift register initial value are 0110101010010.
PN2 is produced by the linear feedback shift register shown in Fig. 6 b, and generator polynomial is: x
18+ x
17+ x
16+ x
13+ x
12+ x
10+ x
8+ x
6+ x
3+ x+1, shift register initial value are 011010101001010101.
Last each the pseudo-code periodic modulation one bit time code data of PN1, temporal information is encoded to fixedly frame length 256bit, and the frame format definition is as shown in table 8:
Time encoding definition format on table 8 PN1
| Flag of frame 16bit | Time cycle counting 32bit | Secondary planet frequency-difference 32bit | The PN reset cycle indicates 6bit | Reset and indicate 1bit | Pilot tone is inserted and is indicated 1bit | Information category and data segment 152bit | CRC 16bit |
Each segment information explanation is as follows in the table 8:
Flag of frame 16bit indicates this frame to begin, and is made up of " 1110101110010000 ";
Time cycle counting 32bit representes this frame first bit " 1 " relative system zero T constantly
0Count value, be used for ancillary terrestrial and augment repeater system and realize synchronization acquistion;
Secondary planet frequency-difference 32bit, the exemplary frequency deviation values of expression current time satellite forward signal, unit is 0.001Hz, is used for the ground supplement repeater system with the carrier frequency correction of forward signal frequently;
The PN reset cycle indicates 6bit, and the reset cycle of expression PN1 and PN2, reset cycle indication field value is distinguished corresponding 1 second to 64 seconds (the acquiescence value is 0 * 00) from 0 * 00～0 * 3F.
Resetting indicates 1bit, and value is 1 o'clock, and first PN1 original position that indicates the current time coded frame is a reset position.
Pilot tone is inserted and is indicated 1bit, does not insert pilot tone in 0 beacon signal; Inserted pilot tone (the acquiescence value is 1) in 1 beacon signal.
Information category and data segment 152bit keep (is " 01010101 " by the byte value), are used for follow-up business and carry other system information;
CRC16bit is used for the information coding CRC of this frame except that flag of frame, and the CRC generator polynomial is: x
16+ x
12+ x
5+ 1.
System zero is pressed a second cycle reset according to the content in the PN reset cycle control word constantly, and the content of PN1 and PN2 shift register is initial value when resetting.
With this is the initial moment constantly, and the system time counter carries out accumulated counts by system clock
Through second all after dates that reset, PN1 and PN2 get back to initial value simultaneously, system time counter O reset this moment, and system time was got back to for zero moment and is restarted accumulated counts.
The speed of each branch road of data QPSK symbols streams is identical with system-clock rate, and synchronous with system clock.The compound employing stacked system of the signal of data and time PN sign indicating number, the PN coded signal level of I, each branch road of Q is 1/20 of data signal levels.PN1 and the stack of I road signal, PN2 and the stack of Q road signal.
Pilot signal is inserted:
For the ease of the correct reinsertion of carrier information of transponder, in the QPSK baseband signal, add pilot signal according to character rate, the definition of pilot signal is following:
I road: A, 0 ,-A, 0 ...
The Q road: 0, A, 0 ,-A ...
Pilot level A on each branch road is 1/20 of a data level.
Adopt technical scheme of the present invention, can will pass through chnnel coding and combine certain control information to form the transmission package of specific format, provide to each ground forwarding modulator by central modulator with orderly, no ambiguity ground with the CMMB symbol data that interweaves.
Claims (9)
1. a mobile multimedia broadcast satellite distribution data encapsulates and method for synchronous, it is characterized in that, 1 second the signal of standard regulation of CMMB is divided into the time slot of predetermined quantity; Can adopt different modulation modes in each time slot; The symbol data that in a time slot, transmits is as a transmission unit, and said CMMB is with different bandwidth for transmission; The frequency of the corresponding varying number of different bandwidth, said method comprises:
Confirm the data volume of a transmission frame; As a frame, the symbol-byte number in time slot of the single frequency point of other bandwidth or modulation system is the integral multiple of a frame with the symbol-byte number in time slot of single frequency point under the modulation system of narrow bandwidth, the minimum symbol quantity of transmission;
With the data encapsulation in the frame in the transmission package of predetermined format; The data encapsulation of said each frame becomes an initial package and several data transmission; Comprise control information in the wherein said initial package, said control information comprises the transmission feature and the synchronizing information of this frame;
According to the bandwidth of being selected for use; Data with different frequent points transmission in the same time slot are that unit is encapsulated in a series of said transmission package with said frame successively; Wherein, different frequent points can adopt different modulation modes in the same time slot, and has the transmission frame of varying number;
A series of transmission package for being obtained are divided into array, and each group has the transmission package of predetermined quantity, and first byte of first transmission package of each group is carried out inversion operation, insert synchronizing information;
The transmission package that to carry out behind the inversion operation is carried out scrambler, transmission package and local scrambler sequence is carried out XOR handle;
The transmission package of handling through scrambler is carried out the RS coding;
To carrying out the byte convolutional interleave through the data behind the RS coding;
Convolutional encoding is carried out in output to convolutional interleave;
Bit stream to convolutional encoding output carries out the QPSK mapping;
Data to after the QPSK mapping are inserted synchronizing information, and said synchronizing information comprises the two-way binary pseudo-random sequence, wherein raise the time encoding information that is shaped in first via binary pseudo-random sequence, and the modulation intelligence of the second tunnel binary pseudo-random sequence keeps;
Insert pilot signal.
2. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 1 and method for synchronous is characterized in that,
1 second the signal of standard regulation of said CMMB is divided into 40 time slots, each time slot 25ms;
Said CMMB comprises two kinds of signal bandwidth: 2MHz, corresponding 12 frequencies, and 8MHz, corresponding 3 frequencies;
The standard of said CMMB adoptable modulation system in each time slot comprises: BPSK, QPSK, 16QAM.
3. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 2 and method for synchronous is characterized in that,
For the 2MHz bandwidth, the symbol quantity of each frequency single time slot is 27648 bits, wherein,
Use the BPSK modulation system, the information bit of single time slot is 27648 bits, and the symbol-byte number of single time slot is 3456 bytes;
Use the QPSK modulation system, the information bit of single time slot is 55296 bits, and the symbol-byte number of single time slot is 6912 bytes;
Use the 16QAM modulation system, the information bit of single time slot is 110592 bits, and the symbol-byte number of single time slot is 13824 bytes;
For the 8MHz bandwidth, the symbol quantity of each frequency single time slot is 138240 bits, wherein,
Use the BPSK modulation system, the information bit of single time slot is 138240 bits, and the symbol-byte number of single time slot is 17280 bytes;
Use the QPSK modulation system, the information bit of single time slot is 276480 bits, and the symbol-byte number of single time slot is 34560 bytes;
Use the 16QAM modulation system, the information bit of single time slot is 552960 bits, and the symbol-byte number of single time slot is 69120 bytes;
Wherein, the data volume of a frame is 3456 bytes,
Therefore, when adopting the 2MHz bandwidth, the quantity of the transmission frame that each frequency is corresponding is respectively:
The BPSK modulation system is 1 frame;
The QPSK modulation system is 2 frames;
The 16QAM modulation system is 4 frames;
When adopting the 2MHz bandwidth, the quantity of the transmission frame that each frequency is corresponding is respectively:
The BPSK modulation system is 5 frames;
The QPSK modulation system is 10 frames;
The 16QAM modulation system is 20 frames.
4. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 3 and method for synchronous is characterized in that,
Said transmission package meets GB/T 17975.1 standards, and each transmission package comprises 188 bytes, comprises the transmission packet header of 4 bytes and the data field of 184 bytes; Wherein,
Said method forms the initial package with following field, comprising:
Transmission packet header, 32 bits, the definition in this transmission packet header meets GB/T 17975.1 standards; Wherein, pid value is 0x05A0, and load cell is initial to be designated as 1, and it is initial package that the initial indication of pid value and load cell combines this transmission package of explanation, and the transmission priority value is 1, and transmission scrambling controlling value is made as 00, and adaptive section controlling value is 01;
Control field, 40 bytes, 320 bits comprise:
Symbol transmission frame initial package indicates, 16 bits;
Reserved field, 8 bits;
The configuration change indication, 1 bit meets GY/T 220.1-2006 standard;
The byte interleaver device sync id, 1 bit meets GY/T 220.1-2006 standard;
Timeslot number, 6 bits, it is accurate to meet GY/T 220.1-2006 table;
Frequency point number, 8 bits are represented which the frequency emission of attribution data in this symbol transmission frame;
The channel width indication, 1 bit indicates that current data belongs to the signal bandwidth of frequency, wherein 0 representes 2MHz, 1 expression 8MHz;
The expansion control information indicating, 1 bit, when being made as 1, the expansion control information that comprises ground forwarding station identification numbers, through-put power, output frequency mask in the initial bag of expression current sign transmission frame and postpone to finely tune when being made as 0, representes that corresponding field is meaningless;
Mapped mode, 6 bits represent that the data in the current transmission frame are shone upon in which way;
Distribution mode, 6 bits represent current symbol data is sent to each ground based repeater with which kind of distribution mode;
The transmission package numbering, 10 bits, first data transmission in the expression current sign transmission frame belongs to which transmission package in the whole time slot;
Synchronized timestamp, 32 bits, the time slot that expression current sign transmission frame is belonged to is at the x time of land-based repeaters;
The ground forwarding station identification numbers, 32 bits are in order to each ground based repeater of unique identification;
Through-put power, 8 bits, in order to control the power output of each ground based repeater, wherein, 0x00-0xff representes 0% to 100% relative power;
Output frequency mask, 16 bits are controlled the information whether each ground based repeater sends specific frequency, and wherein, high 4 bits keep definition, and low 12 bits can be used to represent which number frequency whether launch, 1 expression emission, 0 expression is not launched;
Postpone to finely tune, 16 bits, in order to notify specific ground based repeater's fine setting metadata cache time, unit of adjustment is the timeslice of a 100ns, wherein, also comprises the bit of indication adjustment direction, and 0 expression shifts to an earlier date, and 1 expression is delayed;
Reserved field, 152 bits;
Symbol data, 1152 bits, transmission is through chnnel coding and the mobile multi-media broadcasting data that interweaves;
Said method also forms the data transmission with following structure, comprising:
Transmission packet header, 32 bits, the definition in this transmission packet header meets GB/T 17975.1 standards; Wherein, to be that 0x054, load cell are initial be designated as 0 to pid value, and the transmission priority value is 1, and transmission scrambling controlling value is made as 00, and adaptive section controlling value is 01;
Symbol data, 1472 bits, transmission is through chnnel coding and the mobile multi-media broadcasting data that interweaves.
5. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 4 and method for synchronous is characterized in that,
First byte of said first transmission package to each group is carried out inversion operation, and first byte of first transmission package of this each group is a sync byte, and synchronizing information is inserted in this sync byte negate.
6. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 5 and method for synchronous is characterized in that,
The said transmission package that will carry out behind the inversion operation carry out scrambler, to the transmission package of handling through scrambler carry out the RS coding, to carrying out the byte convolutional interleave through the data behind the RS coding and the step that convolutional encoding is carried out in the output of convolutional interleave met GS/T 17700 standards, wherein:
In the said scrambler operation, the local scrambler sequence that generates is 15 rank shift register pseudo-random binary sequences, and generator polynomial is: G (x)=x
15+ x
14+ 1, the initial value of register from a high position to the low level is: 000000010101001, and wherein, the sync byte in the transmission package is not participated in the scrambler operation, but in the sync byte stage, pseudo-random binary sequence generates uninterrupted;
In the said operation of carrying out RS coding, adopt RS (204,188) coding that the transmission package behind the scrambler is carried out the RS coding;
Said carrying out in the byte convolutional interleave, interleave depth is I=12, and the shift register degree of depth that interweaves is M=17, and the delay of whole interweaving-deinterleaving is 2224 bytes;
Said carrying out in the convolutional encoding; At first constraint length being carried out in the output of convolutional interleave is 7 convolutional encoding; The code check of coding is 1/2, and then punch operation is carried out in output to convolutional encoding, and supported convolutional encoding code check is: 1/2,2/3,3/4,5/6,7/8.
7. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 6 and method for synchronous is characterized in that,
Said bit stream to convolutional encoding output carries out the QPSK mapping and comprises the QPSK mapping of carrying out based on Gray code;
QPSK character rate after the modulation is 20M, and the QPSK transmission rate is higher than actual traffic data speed, therefore carries out the plug hole bag and handles, and the definition format of empty bag meets GB/T 17975.1 standards.
8. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 7 and method for synchronous is characterized in that,
Said synchronizing information is the binary pseudo-random sequence that two route 20M system clocks drive, and wherein raises the time encoding information that is shaped in first via binary pseudo-random sequence, and the modulation intelligence on the second tunnel binary pseudo-random sequence keeps;
First via binary pseudo-random sequence is produced by linear feedback shift register, and generator polynomial is: x
13+ x
4+ x
3+ x+1, shift register initial value are 0110101010010;
The second tunnel binary pseudo-random sequence is produced by linear feedback shift register, and generator polynomial is: x
18+ x
17+ x
16+ x
13+ x
12+ x
10+ x
8+ x
6+ x
3+ x+1, shift register initial value are 011010101001010101.
9. mobile multimedia broadcast satellite distribution data encapsulation as claimed in claim 8 and method for synchronous is characterized in that,
Each pseudo-code periodic modulation one bit time code data on the first via binary pseudo-random sequence, temporal information is encoded to fixedly frame length 256 bits, and said method forms following temporal information coding:
Flag of frame, 16 bits indicate this frame to begin, and form by 1110101110010000;
The time cycle counting, 32 bits are represented this frame first bit 1 relative system zero T constantly
0Count value, be used for ancillary terrestrial and augment repeater system and realize synchronization acquistion;
Secondary planet frequency-difference, 32 bits, the exemplary frequency deviation values of expression current time satellite forward signal, unit is 0.001Hz, is used for the ground supplement repeater system with the carrier frequency correction of forward signal frequently;
The PN reset cycle indicates, 6 bits, and the reset cycle of the expression first via binary pseudo-random sequence and the second tunnel binary pseudo-random sequence, reset cycle indication field value is from 0x00～0x3F, and correspondence is 1 second to 64 seconds respectively;
The sign that resets, 1 bit, value is 1 o'clock, first first via binary pseudo-random sequence original position of expression current time coded frame is a reset position;
Pilot tone is inserted and is indicated, 1 bit, and value is not insert pilot tone in 0 expression signal; Value is to have inserted pilot tone in 1 expression signal, and in this step, pilot tone defines as follows:
I road: A, 0 ,-A, 0 ....
The Q road: 0, A, 0 ,-A ....
Pilot level A on each branch road is 1/20 of a data level;
Information category and data segment, 152 bits are preserved for follow-up business and carry other system information;
CRC, 16 bits are used for the information coding CRC of this frame except that flag of frame, and the CRC generator polynomial is: x
16+ x
12+ x
5+ 1;
Wherein, the content during zero moment indicated according to the PN reset cycle is by a second cycle reset, and the content of the first via binary pseudo-random sequence and the second tunnel binary pseudo-random sequence shift register is initial value when resetting;
The speed of each branch road of data QPSK symbols streams is identical with system-clock rate; And it is synchronous with system clock; The compound employing stacked system of the signal of data and time binary pseudo-random sequence sign indicating number; The binary pseudo-random sequence coded signal level of I, each branch road of Q is 1/20 of data signal levels, first via binary pseudo-random sequence and the stack of I road signal, the second tunnel binary pseudo-random sequence and the stack of Q road signal.
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| WO2011004838A1 (en) * | 2009-07-10 | 2011-01-13 | 日本電気株式会社 | Scrambling method and communication apparatus |
| CA2787774C (en) * | 2010-01-22 | 2019-02-12 | Sharp Kabushiki Kaisha | Transmission device, reception device, communication system, and communication method |
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| CN102468918A (en) * | 2010-11-01 | 2012-05-23 | 华为技术有限公司 | Method for wireless transmitting and reception and device thereof |
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| CN102710386A (en) * | 2012-06-18 | 2012-10-03 | 南京信息工程大学 | Channel coding system for meteorological early warning information processing and working method thereof |
| FR2993369B1 (en) * | 2012-07-11 | 2017-10-13 | Centre Nat D'etudes Spatiales | GNSS RADIO SIGNAL FOR IMPROVED SYNCHRONIZATION |
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| CN107864423A (en) * | 2017-10-19 | 2018-03-30 | 电子科技大学 | A kind of visible light communication wireless sound box based on OFDM |
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| CN111953441B (en) * | 2019-05-15 | 2021-09-10 | 大唐移动通信设备有限公司 | Synchronization method and device |
| CN111786718A (en) * | 2020-06-11 | 2020-10-16 | 中国人民解放军63921部队 | Satellite optical network management and control plane signaling transmission method based on AoS insertion service |
| CN113765837B (en) * | 2021-11-09 | 2022-02-11 | 湖南省时空基准科技有限公司 | Modulation method, system, equipment and storage medium for narrow-band data broadcast |
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