CN1404307A - Data frame forming method and corresponding interleaving and encoding modulation method - Google Patents
Data frame forming method and corresponding interleaving and encoding modulation method Download PDFInfo
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Abstract
The present invention relating to a new method of data frame framing and the corresponding method of interleaving and coding modulation are suitable to be used for compatible transmitting of stationary receiving, portable and mobile receiving. The system uses the block interleaver with the interleaving depth of 50 or 51 to carry out the interleaving. According to the different application purpose, the coding modulations of 16 QAM+3/4 cellular coding, 64 QAM+5/6 cellular coding, 256 QAM+7/8, QPSK or QPSK+1/2 cellular coding will be used to carry out the coding for the data transmitting and to use new type framing method to framing and transmitting in data frame unit.
Description
The present invention relates to a kind of novel Frame framing method and interweave accordingly, code modulating method, be applicable to fixing receive and portable, move and receive professional compatibility and transmit.
The broadcast television transmissions mode can be divided into wireless, wired and satellite transmits according to the employing transmission medium, and three kinds of transmission meanss respectively have pluses and minuses, have complementarity.China is vast in territory, and it obviously is optimal path that satellite transmits is adopted in the outlying district; But because high building stands in great numbers, blocks mutually, satellite receives and is very limited in the city.For the thickly populated city, development cable TV economical and effective, and have network advantage and multi-service advantage, but networking needs time and fund input.Wireless transmission can guarantee that radio and television cover safety, in case war or natural calamity take place, radiovision still can guarantee to cover, and it is professional that wireless transmission can also provide mobile reception in addition.Therefore, multiple transmission means such as that complete Chinese TV transmission system must comprise is wireless, wired, satellite television transmission, emerging digital television transfer system is no exception.
Along with the development of digital technology, Digital Television enters the practical stage, and Digital Television will mainly provide the fixing business that receives in one period.Simultaneously, determining of a kind of radio and television standard, must consider the needs of radio and television development in following 10 years, especially in present age that science and technology develops rapidly, along with the development of peripheral technology and the raising of people's living standard, arise at the historic moment having the new business that comprises data and multimedia service, the digital television transfer method must be with good expansibility and the self-growth potentiality.In addition, for the terrestrial DTV transmission, portable and mobile reception business is more and more important, therefore receives the essential feature that professional support also becomes the terrestrial DTV transmission to moving.But, with fixing receive professional obviously difference be, because the wireless channel antijamming capability is relatively poor, mobile service is easier to be subjected to interference such as doppler echo, shadow fading, so supports mobile the reception under the professional prerequisite of professional and fixing reception to need the aspects such as code modulation mode, interleaving mode and framing method of transmission employing are thought at the same time.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
Du Baichuan, " Digital Television ", " radio and television science and technology wall bulletin " special issue, chapter 6 " transmission system ", 73-121
Cao Zhigang, " Principles of Modern Communication ", publishing house of Tsing-Hua University, 252-309
G.Ungerboeck，“Channel?coding?with?multilevel?phase?signal?set”，IEEE?IT-28，pp.55-67，Jan.1982
Just be based on above background, the present invention proposes a kind of adopt novel Frame framing method and interweave accordingly, code modulating method, can satisfy the composite services of digital TV broadcasting service, digital audio broadcasting service, data service, multi-media broadcasting service and single business of multichannel or the multiplexing formation of multiple business fixing receive and portable, move the needs that receive.
The present invention is that 51 block interleaver interweaves according to the application scenario differing needles to fixed service transmission The data interleave depth, adopts the code modulation mode of 16QAM+3/4 lattice code, 64QAM+5/6 lattice code or 256QAM+7/8 lattice code to encode and according to fixed service transmission frame-form framing; At mobile service transmission The data interleave depth is that 50 block interleaver interweaves, and adopts the code modulation mode of QPSK or QPSK+1/2 lattice code to encode and according to mobile service transmission frame-form framing.The control information that different interweave, code modulation mode writes in frame by framer is indicated and is carried out corresponding identification at receiving terminal.
Corresponding data transmission method is realized in the following manner: the information code current of input passes through scrambler, comprises that RS coding, byte-interleaved, trellis-coded modulation are (according to institute's transport service character, this is optional) behind interior concatenated coding, carry out framing and handle according to special frame structure, code stream is modulated and be converted in the corresponding radio frequency band and send then; At receiving terminal, the signal that receives recovers the raw information code stream through demodulation and the decode procedure opposite with transmitting terminal.Comprise in the transfer of data that RS coding, byte-interleaved and trellis-coded modulation are (according to institute's transport service character, this is optional) between interior concatenated coding and framing method, maintain close ties with, for interweave to comprising better, the present invention of code modulating method describes, at first need framing method is carried out necessary explanation.
The data framing method that carries out in framer as shown in Figure 1, character according to transport service, the process that is used for fixing the business of reception interweaves, the coded data symbol, be sent to fixed service data framing device 1 through selector switch, the frame synchronizing signal that insertion is produced by frame synchronization generator 3 forms Frame with the hangover symbol and transmits; The process that is used for mobile reception business interweaves, the coded data symbol, be sent to mobile service data framer 2 through selector switch, the frame synchronization that insertion is produced by frame synchronization generator 3, training symbol (because the pseudorandom training sequence in training symbol and the frame synchronization in essence and indifference, therefore also can be produced by frame synchronization generator 3) and the symbol that trails form Frame and transmit.Framer can be realized by multiplexer.
According to shown in Figure 1, receive or fixing the reception no matter be used for moving, framer is the frame synchronizing signal of insert structure identical (as shown in Figure 2) in Frame all, frame synchronizing signal forms in two steps, and elder generation generates the frame synchronization symbols sequence of being made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters; Then the frame synchronization symbols sequence is mapped on the I-Q planisphere.
Comprise 512 binary pseudo-random sequence (3 * 512 bit) of a triplicate in each frame synchronization symbols sequence, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit.The generator polynomial and the init state of PN511 sequence are as follows:
PN511：x
9+x
7+x
6+x
4+x
3+x+1(01000000)
PN511：0000 0001 0111 1111 1100 1010 1010 1110 0110 0110 1000 1000 1001 1110 0001 11010111 1101 0011 0101 0011 1011 0011 1010 0100 0101 1000 1111 0010 0001 0100 01111100 1111 0101 0001 0100 1100 0011 0001 0000 0100 0011 1111 0000 0101 0100 00001100 1111 1110 1110 1010 1001 0110 0110 0011 0111 0111 1011 0100 1010 0100 11100111 0001 0111 0100 0011 0100 1111 1011 0001 0101 1011 1100 1101 1010 1110 11011001 0110 1101 1100 1001 0010 1110 0011 1001 0111 1010 0011 0101 1000 0100 11011111 0001 0010 1011 1100 0110 0101 0000 1000 1100 0001 1110 1111 1101 0110 10101100 1001 1001 0001 1101 1100 0010 1101 0000 0110 1100 0000 1001 0000 0001 110
0,PN512：0000 0001 0111 1111 1100 1010 1010 1110 0110 0110 1000 1000 1001 1110 0001 11010111 1101 0011 0101 0011 1011 0011 1010 0100 0101 1000 1111 0010 0001 0100 01111100 1111 0101 0001 0100 1100 0011 0001 0000 0100 0011 1111 0000 0101 0100 00001100 1111 1110 1110 1010 1001 0110 0110 0011 0111 0111 1011 0100 1010 0100 11100111 0001 0111 0100 0011 0100 1111 1011 0001 0101 1011 1100 1101 1010 1110 11011001 0110 1101 1100 1001 0010 1110 0011 1001 0111 1010 0011 0101 1000 0100 11011111 0001 0010 1011 1100 0110 0101 0000 1000 1100 0001 1110 1111 1101 0110 10101100 1001 1001 0001 1101 1100 0010 1101 0000 0110 1100 0000 1001 0000 0001 1100
Adopt linear feedback shift register to generate corresponding 512 binary pseudo-random sequence according to above production and init state, the training sequence that 512 binary pseudo-random sequence of triplicate are formed is inserted in the frame synchronization symbols sequence.The PN512 sequence that repeats is used to the tap of receiving terminal equalizer is trained as training sequence, thereby reduces the influence that intersymbol interference that channel disturbance causes receives data.
After training sequence, according to 8 binary characters of code modulation mode generation of current data frame, and, form the control information of 24 binary characters at 16 binary system stets of its front filling, be inserted in the frame synchronization symbols sequence.Wherein, preceding two bytes are stet, and suggestion is filled to ' 0,000 1,111 0,000 1111 '; After this a byte is defined as: PABC PABC, P are even parity bit, are the highest order of this byte; A, B, C are actual pattern position.The PABC coding rule is as follows:
The corresponding PABC designated symbol of QPSK1 pattern is: 0011
The corresponding PABC designated symbol of QPSK2 pattern is: 1100
The corresponding PABC designated symbol of 16QAM+3/4 lattice code is: 0101*
The corresponding PABC designated symbol of 64QAM+5/6 lattice code is: 0110
The corresponding PABC designated symbol of 256QAM+7/8 lattice code is: 1111
* annotate: in the 16QAM pattern, the suggestion of the stet of two bytes is filled to: 0000 PABC PABC 1111.
Because different code modulation modes each has the interleaving mode of clear and definite correspondence, so this control information in fact also provides the indication of interleaving mode, the identification of confession receiving terminal.
After pseudo random sequence and control information, last 128 binary characters (128 bit) of frame synchronization are reservation bit.Reservation bit can be filled arbitrarily, and suggestion adopts preceding 128 bits of PN512 sequence to fill.Insert and fill the back with top and form complete frame synchronization symbols sequence.
In addition, as shown in Figure 1, no matter be mobile reception business or the fixing business that receives, framer all inserts the hangover symbol in Frame.The hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
The Frame that 1 processing obtains through fixed service data framing device comprises frame synchronization, pay(useful) load and hangover symbol three parts as shown in Figure 3.Preceding 1688 symbol configuration frame sync sections, 1536 symbols are training sequence in these 1688 symbols, 24 symbol definitions the transmission pattern, 128 symbols are waited until after the use.Ensuing 82824 symbols are pay(useful) load, are used for transmitting through chnnel coding and the data after interweaving.24 last symbols are used to make trellis encoder to enter into nought state for hangover symbol (TS), to guarantee the continuity of lattice code when the patterns of change of Frame.
As shown in Figure 1, receive professional interference free performance in order to increase to move, mobile service data framer 2 has also inserted the training symbol part to Frame.Training symbol is formed by 1624 binary character mappings, preceding 1536 binary characters wherein are used for transmitting training sequence, the training sequence that transmits in its structure and the frame synchronization is identical, 512 binary pseudo-random sequence (3 * 512 bit) for triplicate, wherein 512 binary pseudo-random sequence comprise a PN511 sequence, and fill one " 0 " as last bit.The PN511 sequence that the PN512 sequence comprises in the generator polynomial of PN511 sequence and init state and the frame synchronization is identical; 88 symbols in back keep, and suggestion transmits preceding 88 bits of PN511 sequence.
Therefore, the Frame that 2 processing obtain through the mobile service data framer as shown in Figure 4.Wherein, mainly be in the pay(useful) load part to the modification of data frame structure, frame synchronization and hangover symbolic component are not changed.In as the pay(useful) load in the frame structure of Fig. 3, insert training symbol, training symbol takies the symbol period of original pay(useful) load, and pay(useful) load is divided into pay(useful) load 1 and 2 two parts of pay(useful) load, like this, each Frame will comprise frame synchronization, pay(useful) load 1, training symbol, pay(useful) load 2 and five parts of hangover symbol.Preceding 1688 symbol configuration frame sync sections; Ensuing 40600 symbols are pay(useful) load 1, are used for transmitting through interweaving and the data of chnnel coding; In order to increase professional antijamming capability, after 40600 pay(useful) loads, insert the training symbol piece of forming by 1624 symbols, by preceding 1536 symbols transmission training sequence wherein; 40600 symbols at training symbol are pay(useful) load 2, are used for equally transmitting through interweaving and the data of chnnel coding; 24 last symbols are the hangover symbol.Utilize this framing method in Frame, to insert more training sequence, can help the receiving terminal equalizer to restrain as early as possible, thereby realize that reliable mobile service receives.
No matter adopt framing method provided by the invention to guarantee is to be used for moving QPSK1 pattern (QPSK+1/2 lattice code) or the QPSK2 pattern (simple QPSK modulation) that receives, still the code modulation mode that is used for fixing 16QAM+3/4 lattice code, 64QAM+5/6 lattice code or the 256QAM+7/8 lattice code of reception, every frame all comprise complete RS packet (203 byte); Simultaneously, adopt the transmission method of this framing mode to have higher efficiency of transmission, good interference free performance and implement means flexibly.
Adopt Frame framing method provided by the invention and corresponding interweaving, the transmitting terminal embodiment of the transmission system of code modulating method is as shown in Figure 5: data are through scrambler 4, behind the RS encoder 5, according to transport service different mining interleave depth is that the block interleaver 6 of 50 (for mobile services) or 51 carries out interleaving treatment, in trellis encoder 7, carry out lattice code, insert frame synchronization at framer 8 places, hangover symbol (also inserting training symbol) for mobile service, obtain being frame by frame the data of unit transmission, the modulated device 9 of data flow is modulated and is converted in the corresponding radio frequency band and sends then.At receiving terminal, the signal that receives is through demodulation and the decode procedure opposite with transmitting terminal, recover the raw information code stream, the realization of receiving terminal is described in more detail the present invention below in conjunction with transmitting terminal embodiment and accompanying drawing not in the scope that this patent relates to.
Description of drawings:
Fig. 1 is that framer 8 is realized block diagram;
Fig. 2 is the frame synchronization structure schematic diagram;
Fig. 3 is the fixing business data frame structural representation that receives;
Fig. 4 moves to receive the business data frame structural representation;
Fig. 5 is that transmitting terminal is realized block diagram;
Fig. 6 is the realization block diagram that produces the linear feedback shift register of pseudo random sequence in the scrambler 4;
Fig. 7 is the realization block diagram of interleaver 6;
Fig. 8 is the realization block diagram of 1/2 convolution coder used in the trellis encoder 7;
Fig. 9 is the realization block diagram that is used for 3/4 trellis encoder of 16QAM;
Figure 10 is the planisphere of 16QAM+3/4 trellis-coded modulation
Figure 11 is the realization block diagram that is used for 5/6 trellis encoder of 64QAM;
Figure 12 is the planisphere of 64QAM+5/6 trellis-coded modulation
Figure 13 is the realization block diagram that is used for 7/8 trellis encoder of 256QAM;
Figure 14 is the planisphere of 256QAM+7/8 trellis-coded modulation;
Figure 15 is the realization block diagram that is used for 1/2 trellis encoder of QPSK1 pattern;
Figure 16 is the planisphere of QPSK modulation;
Figure 17 is a kind of way of realization of framer 8;
Figure 18 is a kind of planisphere of frame synchronization mapping;
Figure 19 is the spectrum diagram of modulation signal after filter is shaped.
At first in scrambler 4, adopt 16 bit maximum length pseudo-random binary sequences (PRBS) that the net amount certificate (not comprising frame synchronization) of input is carried out randomization.PRBS generates (as Fig. 6) by 16 bit linear feedback shift registers that have 9 feedback taps.8 outputs selecting this shift register are as fixing randomization bytes, and each bit of this byte carries out XOR with corresponding input data bit respectively.The XOR of data bit is high-order to a high position, and low level is to low level.
The proper polynomial of PRBS sequence is x
16+ x
13+ x
12+ x
11+ x
7+ x
6+ x
3+ x+1, its initial condition is " 1111000110000000 ", initialization operation is finished in frame synchronization periods.
Because mobile service is different with the fixed service framing method, also comprise training symbol in the mobile service data frame, do not need scrambler to handle, scrambler uses an enable signal to reach this purpose, enable signal is set to 0 during training symbol under the QPSK1 and QPSK2 pattern of mobile service, be used to shield the scrambler operation, for fixed service, enable signal is set to 1.
MPEG-2 packet behind the scrambler carries out the RS coding through RS encoder 5 again, and the packet of 187 bytes has added that 16 guard bytes constitute shortening RS sign indicating number (203,187).This shortens the mistake that the RS sign indicating number can be corrected the T=8 byte.From serial bit stream generation byte the time, the highest order of byte is first serial data.16 check byte are transmitted after data segment.The multinomial of RS code check generator is as follows:
g(x)＝(x+1)(x+λ)(x+λ
2)…(x+λ
15)
Wherein, λ=02 (hexadecimal);
The territory generator polynomial is:
p(x)＝x
8+x
4+x
3+x
2+1。
In order to strengthen the performance of the anti-error burst of transport service, use 6 pairs of RS codings of block interleaver back data to carry out interleaving treatment, block interleaver 6 as shown in Figure 7, N=203 among the figure, B=51 (corresponding to three kinds of patterns of fixed service transmission) or 50 (corresponding to the QPSK1 pattern or the QPSK2 patterns of mobile service transmission).
Being admitted to the byte through the data behind the RS coding is the block interleaver 6 of unit, and byte stream is written in the internal memory of interleaver 6 by row, reads by row then.
For the situation of B=51, if the representative of following byte stream is input to the byte stream of interleaver 6: x
0x
1X
202x
203x
204, then interleaver 6 is output as: x
0x
203x
400X
10150x
1x
204x
407X
2x
205x
408
Interleaving treatment can help the RS decoder of receiving terminal to correct sudden error code, and the error code maximum length is shown below:
Sudden error code maximum length=B * t byte;
The cycle of corresponding maximum length error burst be shown below (supposition do not consider in the decoding of lattice shape, occur error code diffusion):
QPSK1 then, QPSK2,16QAM, the maximum burst error protection duration of 64QAM and 256QAM pattern correspondence is respectively 448,224,152.32,91.392,65.28 μ sec.
For three kinds of code modulation modes that are used for fixing professional transmission, be 51 owing to adopted interleave depth, interleaving block length is the block interleaving of 51 * 203 bytes, for m-QAM modulation, wherein m=2
tAdopting code check according to the present invention is that the lattice code of (t-1)/t carries out digital coding and comprises the pay(useful) load of 82824 symbols through the Frame that framing procedure obtains, and interleaving block corresponding symbol number is 51*203*8* (t/t-1) * (1/t)=82824/t, so each Frame comprises t complete interleaving block.The number of interleaved blocks that comprises corresponding to 16QAM+3/4 lattice code, 64QAM+5/6 lattice code, each Frame of 64QAM+7/8 lattice code is respectively 3,5,7.
For the QPSK1 and the QPSK2 pattern that are used for the mobile service transmission, carrying out interleave depth behind the sign indicating number coding-RS (187,203) outside is 50, and interleaving block length is the block interleaving of 50 * 203 bytes.Adopt concatenated coding to carry out digital coding according to the present invention and comprise the pay(useful) load of 81200 symbols through the Frame that framing procedure obtains, for QPSK pattern 1, it is 1/2 lattice code that ISN has adopted code check, interleaving block corresponding symbol number is 50*203*8* (2/1) * (1/2)=81200, therefore each Frame comprises a complete interleaving block, for QPSK pattern 2, owing to do not adopt lattice code, interleaving block corresponding symbol number is 50*203*8* (1/2)=81200/2, therefore corresponding to QPSKl, each Frame of QPSK2 pattern comprises 1 respectively, 2 interleaving data pieces.
Carry out lattice code through the data after block interleaver 6 processing, according to the difference of using, take respectively to be used for fixing receive 3/4,5/6,7/8 professional lattice code or be used for moving receive professional 1/2 lattice code (being used for the QPSK1 pattern) or without lattice code (being used for the QPSK2 pattern) in the hope of reaching the flexible enforcement of different efficiencies of transmission and interference free performance.
Lattice code is that the n-1 bits data set that will organize is encoded into the n bits data set of organizing more more.The bit employing convolution coder as shown in Figure 8 of first input is encoded into two bits, and (C1, C2), n-2 remaining input bit maps directly to output place of encoder.Uncoded bit called after U1, U2....The convolution coder constraint length is K=7, corresponding 64 lattice shape attitudes, and the effective hangover symbol that adds seven symbols in the Frame ending can guarantee that trellis encoder 7 carrying out entering nought state behind the lattice code to whole Frame.
Trellis encoder 7 is output as n bit, and wherein 2 bits are encoded.Each of these bit groups all is mapped to a complex symbol.The process of mapping is: the bit of first coding and preceding (n-2)/2 a uncoded bit are mapped to the real part (I) of symbol, and the bit of second coding and remaining (n-2)/2 not coded-bit are mapped to the imaginary part (Q) of symbol.Provided the details of each pattern (code modulation mode) coding and mapping below.
The 16QAM pattern adopts 3/4 (R=3/4) lattice code (two not coded-bits are arranged).3/4 lattice code of 16QAM pattern and mapping scheme are as shown in Figure 9.Per 4 bits of trellis encoder 7 outputs are mapped to a 16QAM symbol, and its planisphere as shown in figure 10.
The 64QAM pattern adopts 5/6 (R=5/6) lattice code (4 not coded-bits are arranged).5/6 lattice code of 64QAM pattern and mapping scheme are as shown in figure 11.Per 6 bits of trellis encoder 7 outputs are mapped to and are mapped to a 64QAM symbol, and its planisphere as shown in figure 12.
The 256QAM pattern adopts 7/8 (R=7/8) lattice code (6 not coded-bits are arranged).7/8 lattice code of 64QAM pattern and mapping scheme are as shown in figure 13.Per 8 bits of trellis encoder 7 outputs are mapped to and are mapped to a 256QAM symbol, and its planisphere as shown in figure 14.
For the QPSK1 pattern, trellis encoder 7 is 1/2 convolution coder shown in Figure 8.(C1 C2) is mapped directly to a QPSK symbol, as shown in figure 15 to the bit of two codings.The QPSK planisphere of Cai Yonging as shown in figure 16 in this case.
For the QPSK2 pattern, do not adopt lattice code.Per two uncoded bits adopt planisphere shown in Figure 16 to be mapped directly to a QPSK symbol.
The data that the process lattice code obtains, through framer 8, insert frame synchronization and hangover symbol (fixedly receiving mode), Frame with structure shown in Figure 3 is that unit transmits, if be used for moving QPSK1 pattern or the QPSK2 pattern that receives, during through framer 8, will add frame synchronization, training symbol and hangover symbol, be that unit transmits with Frame shown in Figure 4.
Frame framing shown in Figure 3 comprises the steps:
(1) produces the frame synchronization symbols sequence of forming by the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters, be mapped on the I-Q planisphere and obtain frame synchronizing signal;
(2) with the frame synchronizing signal that generates, the data symbol splicing of trailing symbol and transmission, form complete Frame.
Frame framing shown in Figure 4 comprises the steps:
(1) produces the frame synchronization symbols sequence of forming by the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters, be mapped on the I-Q planisphere and obtain frame synchronizing signal;
The symbol sebolic addressing that generation is made up of the training sequence of 1536 binary characters and 88 binary system stets is mapped on the I-Q planisphere and obtains training symbol;
(2) with the data symbol splicing of the frame synchronizing signal, training symbol, hangover symbol and the transmission that generate, form complete Frame.
Be noted that frame synchronizing signal is actually that the symbol combination mapping of its included training sequence, control information and stet obtains, have independence between these symbols, can produce separately, corresponding framer mode is as shown in figure 17 realized.
If the different code modulation mode (QPSK+1/2 lattice code, QPSK do not adopt lattice code, 16QAM+3/4 lattice code, 64QAM+5/6 lattice code, 64QAM+7/8 lattice code) of The data in each Frame transmits, owing to the RS packet (203 byte) of the corresponding different numbers of the symbol in the Frame, so just realized the transfer of data of different data rate.Simultaneously, owing to indicate according to present frame code modulation mode write control information in frame synchronization when framing is handled, can adjust code modulation mode for unit frame by frame when therefore transmitting, thereby realize the transmission of different data rate, different anti-error capability in different frame, so just the mode with the time-division has realized Delamination Transmission.
The frame synchronization of inserting in the framing procedure also will be shone upon.Frame synchronization takes place according to following steps:
(1), produces the frame synchronization symbols sequence of forming by the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters;
(2), the frame synchronization symbols sequence is mapped on the I-Q planisphere.
A kind of typical embodiment be set by step 1 form the frame synchronization symbols sequence after, as shown in figure 18 its phase place rotation 45 degree are mapped on the I-Q planisphere, 16QAM, the level L of 64QAM and 256QAM pattern correspondence is respectively 8,10,11; The level L of QPSK1 and QPSK2 pattern correspondence is 8.
Modulate the signal that obtains with shaping filter through modulator 9 and be sent to radio frequency transmission part frequency conversion and emission.What shaping filter adopted is that rolloff-factor is 0.12 root raised cosine roll-off filter, and its frequency domain representation formula is shown below:
Wherein, α=0.12 is a rolloff-factor,
, T
sBe symbol period.
The spectrum diagram that transmits that obtains as shown in figure 19.
The invention provides five kinds of different code modulation modes and transmit data, therefore can realize five kinds of different net load transfer rates:
The corresponding net load transfer rate of 16QAM+3/4 lattice code is: 19.23Mbps;
The corresponding net load transfer rate of 64QAM+5/6 lattice code is: 32.23Mbps;
The corresponding net load transfer rate of 64QAM+7/8 lattice code is: 45.12Mbps
The corresponding net load transfer rate of QPSK1 pattern (QPSK+1/2 lattice code) is: 6.32Mbps;
The corresponding net load transfer rate of QPSK2 pattern (simple QPSK modulation) is: 12.64Mbps.
The process that the process of Data Receiving and data send is opposite substantially, and received signal recovers original MPEG-2 code stream through synchronously, behind demodulation mapping, channel-decoding and the descrambling.In addition, utilize the training sequence that transmits in the Frame, the receiver equalization device can carry out effective channel equalization, to eliminate the linear distortion that is partly brought by channel or receiver front end.
The equalizing training sequence is made up of the PN512 sequence that repeats 3 times.For the fixed service Frame, the insertion cycle of training sequence is 11.8ms, under fixing condition of acceptance, the time-varying characteristics of channel are not too remarkable, this insertion cycle is enough to make equalizer adaptation ground to adjust the variation that its tap coefficient is followed the tracks of channel, satisfies the needs of fixed service reliable reception.
For the mobile service data frame, because with respect to the fixed service Frame, also add training symbol and be used for the self adaptation adjustment of auxiliary reception end equalizer tap, the insertion cycle of the training sequence of being made up of the PN512 sequence of triplicate is less than 6ms, accelerated the tracking of equalizer, thereby satisfied the needs of mobile service reliable reception channel variation.
As seen, because it is 51 block interleaving method that the present invention has adopted fixed service Frame framing method and corresponding interleave depth, the code modulating method of 16QAM+3/4 lattice code, 64QAM+5/6 lattice code, 256QAM+7/8 lattice code, when being applied to professional the transmission, both had good antijamming capability, have service bearer ability flexibly and good and digital cable TV system compatibility again, be fit to very much China's ground digital television broadcast fixed service transmission; And employing mobile service data frame framing method that modification obtains on fixed service transmission technology basis and corresponding interleave depth are 50 block interleaving method, the code modulating method of QPSK or QPSK2+1/2 lattice code can also satisfy the needs that the ground digital television broadcast mobile service transmits.The similitude of these two kinds of business realizing on interleaving mode, framing method makes that the realization of the compatible ground digital TV transmission system that transmits of whole fixed service and mobile service is very economical, convenient, has very strong exploitativeness.
It is to be noted, here the mobile reception of speaking of or fixing to receive business only be framing and interweave accordingly, the typical services way of realization of code modulating method application, in fact as long as transport service satisfies the code check restriction to bearer service of framing method and corresponding transmission method, just can use, the business of modulating as employing QPSK is used for fixing reception, portable reception is fully feasible.Adopt the framing method that the present invention proposes and interweave accordingly, business that code modulating method is applied to the different information contents, different receive modes, do not depart from essence of an invention.
In addition, the present invention only is confined in the application of the professional transmission field of single ground digital television broadcast, the single embodiment of the ground digital TV transmission system that also not only is confined to specification and accompanying drawing and is provided, according to information provided by the invention, the technical staff of relevant industries can not depart from essence of the present invention and make amendment and be applied to the industry and use, during the digital information transmission that comprises the different media of wireless, wired, satellite is used.The essence of an invention protection range is referring to claims.
Claims (14)
1. a frame synchronizing signal method for generation is characterized in that it comprises the steps:
(1), produces the frame synchronization symbols sequence of forming by the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters;
(2), the frame synchronization symbols sequence is mapped on the I-Q planisphere.
2. according to the described frame synchronizing signal method for generation of claim 1, it is characterized in that generating the training sequence that 512 binary pseudo-random sequence of a triplicate form is inserted in the frame synchronization symbols sequence, wherein 512 binary pseudo-random sequence comprise a PN511 sequence, and fill one " 0 " as last bit; The generator polynomial and the init state of PN511 sequence are as follows:
PN511：x
9+x
7+x
6+x
4+x
3+x+1(01000000)。
3. according to the described frame synchronizing signal method for generation of claim 1, it is characterized in that after training sequence, code modulation mode according to current data frame generates 8 binary characters, and at 16 binary system stets of its front filling, form the control information of 24 binary characters, be inserted in the frame synchronization symbols sequence.
4. according to the described frame synchronizing signal method for generation of claim 3, when it is characterized in that being applied to the different pieces of information frame, adopt different code modulation modes, and indicate by the control information in the frame synchronization, can frame be that unit adjusts code modulation mode, realize Delamination Transmission in the mode of time-division.
5. a Frame framing method is characterized in that it comprises the steps:
(1) produces the frame synchronization symbols sequence of forming by the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters, be mapped on the I-Q planisphere and obtain frame synchronizing signal;
Produce 24 hangover symbols, last 7 symbols are ending place that is inserted into every frame in the hangover symbol, stop lattice code, make its effective hangover symbol that returns to nought state, and all the other 17 symbols are stet;
(2) with the frame synchronizing signal that generates, the data symbol splicing of trailing symbol and transmission, form complete Frame.
6. according to the described Frame framing method of claim 5, it is characterized in that the Frame that is produced comprises 84536 symbols, be divided into frame synchronization, pay(useful) load and hangover symbol three parts: wherein, preceding 1688 symbol configuration frame sync sections, ensuing 82824 symbols are pay(useful) load, and 24 last symbols are the hangover symbol;
The symbol sebolic addressing mapping that Frame frame synchronization is made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters obtains;
The training sequence of 1536 symbols is made up of 512 binary pseudo-random sequence of triplicate, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit, the generator polynomial of PN511 sequence is: PN511:x
9+ x
7+ x
6+ x
4+ x
3+ x+1, init state is: 01000000;
8 binary characters that comprise in 24 control information symbols that code modulation mode according to present frame generates and at its 16 binary system stets of filling previously;
Frame hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
7. code modulating method, the code modulation mode that it is characterized in that adopting 16QAM+3/4 lattice code, 64QAM+5/6 lattice code or 256QAM+7/8 lattice code with pay(useful) load encode, framing, wherein every frame data comprise frame synchronization, pay(useful) load and hangover symbol three parts, 84536 symbols altogether: preceding 1688 symbol configuration frame sync sections, ensuing 82824 symbols transmit pay(useful) load, and 24 last symbols are the hangover symbol; The symbol sebolic addressing mapping that Frame frame synchronization is made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters obtains;
The training sequence of 1536 symbols is made up of 512 binary pseudo-random sequence of triplicate, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit, the generator polynomial of PN511 sequence is: PN511:x
9+ x
7+ x
6+ x
4+ x
3+ x+1, init state is: 01000000;
8 binary characters that comprise in 24 control information symbols that code modulation mode according to present frame generates and at its 16 binary system stets of filling previously;
Frame hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
8. according to the described code modulating method of claim 7, it is characterized in that the code modulation mode that is adopted indicates with 8 symbols in the control information of Frame frame synchronization, corresponding indexical relation is:
The corresponding designated symbol of 16QAM+3/4 lattice code is: 01011010;
The corresponding designated symbol of 64QAM+5/6 lattice code is: 01101001;
The corresponding designated symbol of 256QAM+7/8 lattice code is: 11110000.
9. deinterleaving method, to it is characterized in that adopting interleave depth be 51 51 * 203 block interleavings with pay(useful) load interweave, coding, framing, wherein every frame data comprise frame synchronization, pay(useful) load and hangover symbol three parts, 84536 symbols altogether: preceding 1688 symbol configuration frame sync sections, ensuing 82824 symbols transmit pay(useful) load, and 24 last symbols are the hangover symbol;
The symbol sebolic addressing mapping that Frame frame synchronization is made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters obtains;
The training sequence of 1536 symbols is made up of 512 binary pseudo-random sequence of triplicate, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit, the generator polynomial of PN511 sequence is: PN511:x
9+ x
7+ x
6+ x
4+ x
3+ x+1, init state is: 01000000;
8 binary characters that comprise in 24 control information symbols that code modulation mode according to present frame generates and at its 16 binary system stets of filling previously;
Frame hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
10. a Frame framing method is characterized in that it comprises the steps:
(1) produces the frame synchronization symbols sequence of forming by the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters, be mapped on the I-Q planisphere and obtain frame synchronizing signal;
The symbol sebolic addressing that generation is made up of the training sequence of 1536 binary characters and 88 binary system stets is mapped on the I-Q planisphere and obtains training symbol;
Produce 24 hangover symbols, last 7 symbols are ending place that is inserted into every frame in the hangover symbol, stop lattice code, make its effective hangover symbol that returns to nought state, and all the other 17 symbols are stet;
(2) with the data symbol splicing of the frame synchronizing signal, training symbol, hangover symbol and the transmission that generate, form complete Frame.
11. Frame framing method according to claim 10, it is characterized in that every frame comprises 84536 symbols, be divided into frame synchronization, pay(useful) load 1, training symbol, pay(useful) load 2 and hangover symbol five parts: preceding 1688 symbol configuration frame sync sections, ensuing 40600 symbols are pay(useful) load 1, after this transmit the training symbol of 1624 symbols, being the pay(useful) load 2 of 40600 symbols behind training symbol, is the hangover symbol of 24 symbols at last;
The symbol sebolic addressing mapping that Frame frame synchronization is made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters obtains;
The training sequence of 1536 symbols is made up of 512 binary pseudo-random sequence of triplicate, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit, the generator polynomial of PN511 sequence is: PN511:x
9+ x
7+ x
6+ x
4+ x
3+ x+1, init state is: 01000000;
8 binary characters that comprise in 24 control information symbols that code modulation mode according to present frame generates and at its 16 binary system stets of filling previously;
1624 training symbols by with Frame frame synchronization in the stet of the training sequence of identical 1536 binary characters and 88 binary characters symbol sebolic addressing mapping formed obtain;
Frame hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
12. code modulating method, it is characterized in that adopting the code modulation mode of QPSK1 pattern (QPSK+1/2 lattice code) and QPSK2 pattern (simple QPSK modulation) that pay(useful) load is encoded, framing, wherein every frame data comprise frame synchronization, pay(useful) load 1, training symbol, pay(useful) load 2 and hangover symbol five parts, 84536 symbols altogether: preceding 1688 symbol configuration frame sync sections, ensuing 40600 symbols are pay(useful) load 1, after this transmit the training symbol of 1624 symbols, being the pay(useful) load 2 of 40600 symbols behind training symbol, is the hangover symbol of 24 symbols at last;
The symbol sebolic addressing mapping that Frame frame synchronization is made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters obtains;
The training sequence of 1536 symbols is made up of 512 binary pseudo-random sequence of triplicate, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit, the generator polynomial of PN511 sequence is: PN511:x
9+ x
7+ x
6+ x
4+ x
3+ x+1, init state is: 01000000;
8 binary characters that comprise in 24 control information symbols that code modulation mode according to present frame generates and at its 16 binary system stets of filling previously;
1624 training symbols by with Frame frame synchronization in the stet of the training sequence of identical 1536 binary characters and 88 binary characters symbol sebolic addressing mapping formed obtain;
Frame hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
13. according to the described code modulating method of claim 12, it is characterized in that the code modulation mode that is adopted indicates with 8 symbols in the control information of Frame frame synchronization, corresponding indexical relation is:
The corresponding designated symbol of QPSK1 pattern is: 00111100;
The corresponding designated symbol of QPSK2 pattern is: 11000011.
14. deinterleaving method, to it is characterized in that adopting interleave depth be 50 50 * 203 block interleavings with pay(useful) load interweave, coding, framing, wherein every frame data comprise frame synchronization, pay(useful) load 1, training symbol, pay(useful) load 2 and hangover symbol five parts, 84536 symbols altogether: preceding 1688 symbol configuration frame sync sections, ensuing 40600 symbols are pay(useful) load 1, after this transmit the training symbol of 1624 symbols, being the pay(useful) load 2 of 40600 symbols behind training symbol, is the hangover symbol of 24 symbols at last;
The symbol sebolic addressing mapping that Frame frame synchronization is made up of the stet of the control information of the training sequence of 1536 binary characters, 24 binary characters and 128 binary characters obtains;
The training sequence of 1536 symbols is made up of 512 binary pseudo-random sequence of triplicate, 512 binary pseudo-random sequence wherein comprise a PN511 sequence, and fill one " 0 " as last bit, the generator polynomial of PN511 sequence is: PN511:x
9+ x
7+ x
6+ x
4+ x
3+ x+1, init state is: 01000000;
8 binary characters that comprise in 24 control information symbols that code modulation mode according to present frame generates and at its 16 binary system stets of filling previously;
1624 training symbols by with Frame frame synchronization in the stet of the training sequence of identical 1536 binary characters and 88 binary characters symbol sebolic addressing mapping formed obtain;
Frame hangover symbol comprises that 7 endings place that are used in every frame stop lattice code, make its effective hangover symbol that returns to nought state and 17 stets.
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| WO2006066445A1 (en) * | 2004-12-21 | 2006-06-29 | Zte Corporation | A encoding modulation and demodulation system and its method of transmitting and receiving signal |
| CN101431501B (en) * | 2008-10-27 | 2011-11-23 | 宁波大学 | Modulation method for high-performance digital television ground broadcasting transmitter |
| WO2012034319A1 (en) * | 2010-09-14 | 2012-03-22 | 中兴通讯股份有限公司 | Method and apparatus for encoding modulation of synchronization training symbol blocks |
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| WO2006066445A1 (en) * | 2004-12-21 | 2006-06-29 | Zte Corporation | A encoding modulation and demodulation system and its method of transmitting and receiving signal |
| CN101431501B (en) * | 2008-10-27 | 2011-11-23 | 宁波大学 | Modulation method for high-performance digital television ground broadcasting transmitter |
| CN101521653B (en) * | 2009-03-26 | 2012-05-02 | 华为技术有限公司 | Baseband modulating method, system and linear modulating device |
| CN102404012B (en) * | 2010-09-10 | 2014-08-13 | 上海明波通信技术有限公司 | Training sequence using method in digital communication receiver and adaptive equalizer |
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| CN102404071B (en) * | 2010-09-14 | 2014-12-10 | 中兴通讯股份有限公司 | Encoding modulation method and device of synchronous training symbol blocks |
| WO2015032084A1 (en) * | 2013-09-09 | 2015-03-12 | 华为技术有限公司 | Data receiving method and receiver |
| CN105379215A (en) * | 2013-09-09 | 2016-03-02 | 华为技术有限公司 | Data receiving method and receiver |
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