CN101345738B - Mapping and interweaving method and system for digital television ground broadcast signal - Google Patents
Mapping and interweaving method and system for digital television ground broadcast signal Download PDFInfo
- Publication number
- CN101345738B CN101345738B CN2008100459483A CN200810045948A CN101345738B CN 101345738 B CN101345738 B CN 101345738B CN 2008100459483 A CN2008100459483 A CN 2008100459483A CN 200810045948 A CN200810045948 A CN 200810045948A CN 101345738 B CN101345738 B CN 101345738B
- Authority
- CN
- China
- Prior art keywords
- mapping
- 4qam
- bit data
- bit
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The present invention applies to the digital signal processing field, provides a mapping and interlacing method and system for digital television terrestrially broadcast signals. The method includes: acquiring interlacing mode information and modulating mode information corresponding to the input LDPC coding bit data; interlacing the LDPC coding bit data according to corresponding interlacing mode based on the interlacing mode information; based on the modulating mode information, when the modulation mode is one of 64QAM, 32QAM, 16QAM and 4QAM, directly performing constellation mapping of corresponding modulating mode to bit data after interlacing, and when the modulation mode is 4QAM-NR, firstly performing NR quasi-orthogonal pre-mapping and then performing 4QAM constellation mapping to the bit data after interlacing. The present invention, by firstly interlacing and then mapping the bit data stream together, decreases the bits of basic symbols during interlacing, can decrease the size of memory of the interlacing device, and does not require to increase additional module to realize according to the 4QAM-NR mode, thereby reducing the production cost.
Description
Technical field
The invention belongs to digital processing field, relate in particular to a kind of mapping and deinterleaving method and system of digital television ground broadcast signal.
Background technology
In Digital Television Terrestrial Broadcasting, chnnel coding and modulation have very important significance, and it in data flow, improves the antijamming capability of data in transmission course by additional redundancy EDC error detection and correction information, reduces the error rate, guarantee normally to receive.In the chnnel coding and modulation standard of existing Digital Television Terrestrial Broadcasting, constellation mapping and deinterleaving method are the channel coding technologies of using always, can carry out 64 quadrature amplitude modulation (QAM), 32QAM, 16QAM, 4QAM and five kinds of constellation mapping of 4QAM-NR and weaving width and interleave depth and be respectively (52,240), two of (52,720) kinds of interlace modes.
Fig. 1 shows the mapping of existing digital television ground broadcast signal and the realization principle of interleaving treatment, and the specific implementation process is as follows:
S1: know low density parity check code (Low Density Parity CheckCode according to the configuration of system, LDPC) modulation system and the interleaving mode of coded-bit data stream, described modulation system is a kind of among above-mentioned 64QAM, 32QAM, 16QAM, 4QAM and the 4QAM-NR, and described interleaving mode is a kind of in above-mentioned two kinds of interlace modes.
S2: according to the modulation system of knowing, the Bit data of choosing corresponding figure place be one group to carry out constellation mapping, every group of bit number of above-mentioned each modulation system correspondence is 64QAM → 6,32QAM → 5,16QAM → 4,4QAM → 2.
S3: when modulation system is a kind of among 64QAM, 32QAM, 16QAM, the 4QAM,, Bit data is mapped to symbol in the constellation according to the constellation mapping table of corresponding modulation system.
S4: according to the interleaving mode of knowing, the symbol data of exporting with constellation mapping is that base unit carries out the back output of convolutional interleave coding.
S5: when modulation system is 4QAM-NR, earlier Bit data is carried out the convolutional interleave coding by corresponding interleaving mode.
S6: the data of the back output that interweaves are carried out the accurate quadrature of NR shine upon in advance.
S7: in the constellation mapping table of 4QAM correspondence, the data map that the accurate quadrature of NR is shone upon back output is in advance exported after becoming symbol in the constellation.
As follows in the relation between Bit data and the constellation symbol under every kind of modulating mode:
64QAM: I, Q two paths of data that 6 Bit data branches of input are orthogonal, be mapped to respectively again ± 1, ± 3, ± 5, ± data in 7, when using binary representation, need 3 binary representation data and 1 bit representation symbol, then two paths of data needs a symbol among 8 binary representation 64QAM altogether.
32QAM: 5 Bit datas of input are mapped to ± 1.5, ± 4.5, ± data in 7.5, when using binary representation, owing to have decimal point need multiply by 2, so, then need a symbol among 10 binary representation 32QAM altogether with 4 binary representation data and 1 bit representation symbol.
16QAM: I, Q two paths of data that 4 Bit data branches of input are orthogonal, be mapped to respectively again ± 2, ± data in 6, when using binary representation, need 3 binary representation data and 1 bit representation symbol, then two paths of data needs a symbol among 8 binary representation 16QAM altogether.
4QAM: I, Q two paths of data that 2 Bit data branches of input are orthogonal are mapped to respectively ± 4.5, owing to there is decimal point need multiply by 2, with 4 binary representation data and 1 bit representation symbol, so need a symbol among 10 binary representation 4QAM altogether again.
Therefore, increased the figure place of data after the constellation mapping, thereby the memory that needs are bigger when interweaving is stored the data in interweaving; In addition, owing in the 4QAM-NR modulation, be the back constellation mapping that interweaves earlier, inconsistent with other modulation system order, need extra module to realize its function, increased the consumption of resource.
Summary of the invention
The objective of the invention is to: mapping and deinterleaving method and system that a kind of digital television ground broadcast signal is provided, the figure place that is intended to solve constellation mapping in the prior art and has increased Bit data makes that required memory space is bigger when interweaving, and increases extra module for the need of 4QAM-NR pattern and realize causing the production cost problem of higher.
The object of the present invention is achieved like this:
A kind of mapping of digital television ground broadcast signal and deinterleaving method, described method comprises the steps:
A, obtain and corresponding interlace mode information and the modulation mode information of importing of LDPC coded-bit data;
B, according to described interlace mode information described LDPC coded-bit data are interweaved by corresponding interlace mode, be specially: for 64QAM, per according to this 6 Bit datas of described LDPC number of coded bits are one group to interweave by corresponding interlace mode, for 32QAM, with per according to this 5 Bit datas of described LDPC number of coded bits is one group, and mend 1 " 0 " in the high position of this 5 Bit data, with these 6 Bit datas of mending after 0 is that base unit interweaves by corresponding interlace mode, for 16QAM, with per according to this 4 Bit datas of described LDPC number of coded bits is one group, and mend 2 " 0 " in the high position of this 4 Bit data, with these 6 Bit datas of mending after 0 is that base unit interweaves by corresponding interlace mode, for 4QAM, with per according to this 2 Bit datas of described LDPC number of coded bits is one group, and mend 4 " 0 " in the high position of this 2 Bit data, with these 6 Bit datas of mending after 0 is that base unit interweaves by corresponding interlace mode, for 4QAM-NR, with per according to this 1 Bit data of described LDPC number of coded bits is one group, and, be that base unit interweaves by corresponding interlace mode with these 6 Bit datas of mending after 0 in 5 " 0 " of high position benefit of this 1 Bit data;
C, according to described modulation mode information, when described modulating mode is a kind of among 64QAM, 32QAM, 16QAM, the 4QAM, Bit data after then will interweaving directly carries out the constellation mapping of corresponding modulating mode, and when described modulating mode is 4QAM-NR, Bit data after then will interweaving carries out the accurate quadrature of NR earlier and shines upon in advance, carries out the constellation mapping of 4QAM again.
Described step C specifically comprises: when described modulating mode is a kind of among 64QAM, 32QAM, 16QAM, the 4QAM, Bit data after will interweaving is that elementary cell is directly carried out and the corresponding constellation mapping of described modulating mode with every group with the corresponding number of bits of described modulating mode, wherein, with described 4 kinds of modulating modes under corresponding respectively every group of number of bits be 64QAM → 6,32QAM → 5,16QAM → 4,4QAM → 2; When described modulating mode was 4QAM-NR, the Bit data after will interweaving was that unit carries out the accurate quadrature of NR earlier and shines upon in advance with every group 8 bit, is the constellation mapping that unit carries out 4QAM with the Bit data after the pre-mapping of NR with every group 2 bit again.
Described step C specifically comprises: for 64QAM, per 6 bits of the back output that will interweave are a symbol, carry out the constellation mapping of 64QAM; For 32QAM, low 5 bits of getting in per 6 bits of exporting the back that interweaves are a symbol, carry out the constellation mapping of 32QAM; For 16QAM, low 4 bits of getting in per 6 bits of exporting the back that interweaves are a symbol, carry out the constellation mapping of 16QAM; For 4QAM, low 2 bits of getting in per 6 bits of exporting the back that interweaves are a symbol, carry out the constellation mapping of 4QAM.
Another object of the present invention is to: mapping and interlacing system that a kind of digital television ground broadcast signal is provided, described system comprises: control unit, bit are chosen unit, interleave unit, constellation mapping unit and the accurate quadrature of NR and are shone upon the unit in advance, and described bit is chosen the unit and comprised shift register and shift counter; Interlace mode information and modulation mode information that described control unit reception and storage are corresponding with current LDPC coded-bit data, and control the cycle count that described shift counter carries out the number of times corresponding with described modulating mode according to described modulation mode information, when described modulating mode is respectively 64QAM, 32QAM, 16QAM, 4QAM, during 4QAM-NR, corresponding cycle count number of times is respectively 6,5,4,2,1, described shift register is deposited described LDPC coded-bit data, described shift counter is controlled described shift register and the current Bit data of depositing of line output when counting is full, 6 parallel Bit datas of the unified output of described shift register, during Bit data number less than 6 bits deposited when described shift register is current, the high order bit of 6 Bit datas of output is all put 0; Described interleave unit is under the control of described control unit, interweave according to corresponding interlace mode according to the elite Bit data of getting unit output of described interlace mode information contrast, and the data after will interweaving according to described modulation mode information export to described constellation mapping unit or the accurate quadrature of NR shines upon the unit in advance; The accurate quadrature of described NR shines upon the unit in advance to carry out exporting after the accurate quadrature of NR shines upon in advance to Bit data; Described constellation mapping unit is under the control of described control unit, according to described modulation mode information the Bit data of described interleave unit output is carried out the constellation mapping of 64QAM, 32QAM, 16QAM or 4QAM, or the Bit data that the accurate quadrature of described NR shines upon unit output is in advance carried out the constellation mapping of 4QAM.
Described constellation mapping unit comprises register, 64QAM mapping block, 32QAM mapping block, 16QAM mapping block and 4QAM mapping block, described register is deposited 6 Bit datas of the each output of described interleave unit, and under control, according to being positioned at low level and the Bit data corresponding number of described modulating mode in the current data of depositing of described modulation mode information output to corresponding 64QAM mapping block, 32QAM mapping block, 16QAM mapping block or 4QAM mapping block at described control unit.
Another object of the present invention is to: a kind of mapping of above-mentioned digital television ground broadcast signal and reflector of interlacing system of comprising is provided.
Outstanding advantage of the present invention is: the present invention divides the modulating mode mapping again by LDPC coded-bit data stream is interweaved earlier uniformly, thereby the bit number of the basic symbol when having reduced to interweave, also just can reduce the volume of the memory of interleaver, and also need not increase extra module for the 4QAM-NR pattern and realize, reduced production cost widely.
Description of drawings
Fig. 1 is the mapping of existing digital television ground broadcast signal and the theory diagram of interleaving treatment;
Fig. 2 is the mapping of the digital television ground broadcast signal that provides of the embodiment of the invention and the theory diagram of interleaving treatment;
Fig. 3 is the mapping of the digital television ground broadcast signal that provides of the embodiment of the invention and the specific implementation flow chart of deinterleaving method;
Fig. 4 is the structural representation of the convolutional interleave that provides of the embodiment of the invention;
Fig. 5 is the 64QAM rectangle constellation mapping figure that the embodiment of the invention provides;
Fig. 6 is the 32QAM rectangle constellation mapping figure that the embodiment of the invention provides;
Fig. 7 is the 16QAM rectangle constellation mapping figure that the embodiment of the invention provides;
Fig. 8 is the 4QAM rectangle constellation mapping figure that the embodiment of the invention provides;
Fig. 9 is the mapping of the digital television ground broadcast signal that provides of the embodiment of the invention and the structure chart of interlacing system.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The mapping of the digital television ground broadcast signal that the embodiment of the invention provides and deinterleaving method and system divide the modulating mode mapping again by LDPC coded-bit data stream is interweaved earlier uniformly, thereby the bit number of the basic symbol when having reduced to interweave, also just can reduce the volume of the memory of interleaver, and also need not increase extra module for the 4QAM-NR pattern and realize, reduced production cost and power consumption widely.
Fig. 2 shows the mapping of the digital television ground broadcast signal that the embodiment of the invention provides and the realization principle that interweaves, in embodiments of the present invention, no matter for which kind of modulation system, all be earlier LDPC coded-bit data to be interweaved, according to different modulation systems, carry out constellation mapping again with the data of the back output that interweaves.
In the specific implementation process, S1 ' is identical with above-mentioned S1 and S2 respectively with S2 ', so repeat no more.
In S3 ', one group of data that bit is chosen are that unit carries out the convolutional interleave coding according to corresponding interleaving mode.
In S4 ', when modulation system is a kind of among 64QAM, 32QAM, 16QAM, the 4QAM,, Bit data is mapped to symbol in the constellation and output constellation data according to the constellation mapping table of corresponding modulation system.
In S5 ', if 4QAM-NR modulation, the data of the output that then will interweave are earlier carried out the accurate quadrature of NR earlier and are shone upon in advance, carry out the 4QAM mapping again, and output constellation data.
The specific implementation flow process of the mapping of the digital television ground broadcast signal that the embodiment of the invention provides and deinterleaving method as shown in Figure 3, details are as follows:
In step S301, serial input LDPC coded-bit data.
In step S302, know the modulation system and the interleaving mode of described LDPC coded-bit data stream according to the configuration of system, thereby control the every group of bit symbol number that inputs to interleaver.
In step S303, judge whether interleaving mode is interlace mode 2, be execution in step S304 then; Otherwise execution in step S305.
In embodiments of the present invention, establishing (52,240) is interlace mode 1, and (52,720) are interlace mode 2.
In step S304, according to different modulation systems, be base unit with the bit symbol of every group of corresponding number, carry out convolutional interleave according to interlace mode 2.
For 64QAM, per 6 bits of the Bit data of input are one group and send into interleaver that interleaver interweaves according to interlace mode 2; For 32QAM, per 5 bits of the Bit data of input are one group, mend 1 " 0 " in the high position of 5 Bit datas, this 6 bit data is sent into interleaver interweave; For 16QAM, per 4 bits of the Bit data of input are one group, mend 2 " 0 " in the high position of 4 Bit datas, this 6 bit data is sent into interleaver interweave; For 4QAM, per 2 bits of the Bit data of input are one group, mend 4 " 0 " in the high position of 2 Bit datas, this 6 bit data is sent into interleaver interweave; For 4QAM-NR, per 1 bit of the Bit data of input is one group, mends 5 " 0 " in the high position of 1 Bit data, this 6 bit data is sent into interleaver interweave.
Its implementation structure that interweaves as shown in Figure 4, wherein variable B represents weaving width (being number of branches), variable M represents interleave depth (being the delay buffer storage size), for interlace mode 1, B=52 then, M=240 symbol; For interlace mode 2, B=52 then, M=720 symbol.First symbol and the branch road 0 of master data piece that carries out symbol interleaving is synchronous.The right overall delay of interleaving/deinterleaving is the (symbol of M * (B-1) * B).
The symbol of input enters 52 branch roads successively, article one, the straight-through output of the data of branch road, article 2 to the 51st, branch road enter successively the degree of depth be 720 * 1,720 * 2 ... fill up data when the output of delaying time of 720 * 51 first in first out (FIFO) delay buffer storage, the FIFO initialization of each bar branch road.The output of interleaver is also exported according to the data that the 0th order to the 51st branch road reads FIFO successively, finishes convolutional interleave.
Step S305 is then to carry out convolutional interleave with described step S304 similar methods according to interlace mode 1.
In step S306, judge whether the adjustment mode is 4QAM-NR, be execution in step S307 then; Otherwise execution in step S308.
In step S307, the data of the back output of interweaving are carried out one 8 bit shine upon in advance to the accurate quadrature of NR of 16 bits.
Per 8 bits that the NR mapping will be imported are mapped as 16 bits, establish these 16 table of bits and are shown:
x0x1x2x3x4x5x6x7y0y1y2y3y4y5y6y7
Wherein, x0x1x2x3x4x5x6x7 is an information bit, and y0y1y2y3y4y5y6y7 is the bit of deriving, and value is 0 or 1, and its restriction relation satisfies following formula:
y0＝x7+x6+x0+x1+x3+(x0+x4)(x1+x2+x3+x5)+(x1+x2)(x3+x5)
y1＝x7+x0+x1+x2+x4+(x1+x5)(x2+x3+x4+x6)+(x2+x3)(x4+x6)
y2＝x7+x1+x2+x3+x5+(x2+x6)(x3+x4+x5+x0)+(x3+x4)(x5+x0)
y3＝x7+x2+x3+x4+x6+(x3+x0)(x4+x5+x6+x1)+(x4+x5)(x6+x1)
y4＝x7+x3+x4+x5+x0+(x4+x1)(x5+x6+x0+x2)+(x5+x6)(x0+x2)
y5＝x7+x4+x5+x6+x1+(x5+x2)(x6+x0+x1+x3)+(x6+x0)(x1+x3)
y6＝x7+x5+x6+x0+x2+(x6+x3)(x0+x1+x2+x4)+(x0+x1)(x2+x4)
y7＝x0+x1+x2+x3+x4+x5+x6+x7+y0+y1+y2+y3+y4+y5+y6。
In step S308, with per 6 bits of Bit data of interleaver output is one group of input constellation mapper, according to different modulation systems, in every group of data, get the Bit data (to remove preceding " 0 " of mending that interweaves) of corresponding figure place, obtain the constellation mapping data at corresponding constellation mapping table.
The mapping method of each modulation system correspondence is as follows:
64QAM: all 6 bits of interleaver output are a symbol, carry out constellation mapping by the constellation mapping figure of as shown in Figure 5 64QAM, obtain IQ two-way constellation mapping data.
32QAM: interleaver output be 6 bits, low 5 bits of getting wherein are a symbol, carry out constellation mapping by the constellation mapping figure of as shown in Figure 6 32QAM, obtain IQ two-way constellation mapping data.
16QAM: interleaver output be 6 bits, low 4 bits of getting wherein are a symbol, carry out constellation mapping by the constellation mapping figure of as shown in Figure 7 16QAM, obtain IQ two-way constellation mapping data.
4QAM: interleaver output be 6 bits, low 2 bits of getting wherein are a symbol, carry out constellation mapping by the constellation mapping figure of as shown in Figure 8 4QAM, obtain IQ two-way constellation mapping data.
4QAM-NR: NR is shone upon per 2 bits in back in advance form a symbol, carry out constellation mapping, obtain IQ two-way constellation mapping data by the constellation mapping figure of as shown in Figure 8 4QAM.
In step S309, the constellation symbol data after the output mapping.
In another embodiment of the present invention, when modulation system is fixed as a kind of, when perhaps all being furnished with an interleaver separately for different modulation systems, in above-mentioned steps S304, then need not mend the process of " 0 ", accordingly, in above-mentioned steps S308, also need not obtain the operation of low-order bit, but the Bit data of the each output of interleaver is directly carried out constellation mapping (under the non-4QAM-NR modulating mode).
Fig. 9 shows the mapping of the digital television ground broadcast signal that the embodiment of the invention provides and the structure of interlacing system, for convenience of explanation, only show the part relevant with the embodiment of the invention, these parts can be the unit of software, hardware or software and hardware combining.
Bit is chosen unit 92 and according to current modulating mode the LDPC coded-bit data rheology of serial is parallel symbols streams.Bit data deposits shift register 922 successively in, simultaneously, modulating mode control module 912 is according to the number of times of described current modulation mode information control shift counter 921 cycle counts in the memory 911, be respectively 64QAM for modulating mode, 32QAM, 16QAM, 4QAM and 4QAM-NR, the cycle count number of times of shift counter 921 is respectively 6,5,4,2,1, control signal of shift counter 921 outputs when counting is full, parallel 6bit symbol data of control shift register 922 outputs is to the unit 93 that interweaves, and empty shift register simultaneously, choose with the bit that carries out next group.When the number of bits in the shift register 922 was discontented with 6bit, the high order bit of the 6bit symbol of output was 0.
The parallel 6bit symbol data that interleave unit 93 is chosen unit 92 outputs with bit is that base unit carries out convolutional interleave, simultaneously, the Bit data of output directly transferred to constellation mapping unit 95 (under the non-4QAM-NR modulating mode) after interlace mode control module 913 will interweave according to the described current interlace mode information Control interleave unit 93 in the memory 911, perhaps transferred to the accurate quadrature of NR and shone upon unit 94 (under the 4QAM-NR modulating mode) in advance.
Under non-4QAM-NR modulating mode, every 6bit data of interleave unit 93 outputs deposit register 951 successively in, simultaneously, modulating mode control module 912 is according to the extremely corresponding mapping block of Bit data of the corresponding figure place of 951 outputs of the described current modulation mode information control register in the memory 911.For 64QAM, register 951 output 6bit data be a symbol to 64QAM mapping block 952,64QAM mapping block 952 finds out the IQ two-way constellation data output corresponding with the Bit data that receives in built-in 64QAM constellation mapping table; For 32QAM, the 5bit data of register 951 output low levels be a symbol to 32QAM mapping block 953,32QAM mapping block 953 finds out the IQ two-way constellation data output corresponding with the Bit data that receives in built-in 32QAM constellation mapping table; For 16QAM, the 4bi t data of register 951 output low levels be a symbol to 16QAM mapping block 954,16QAM mapping block 954 finds out the IQ two-way constellation data output corresponding with the Bit data that receives in built-in 16QAM constellation mapping table; For 4QAM, the 2bit data of register 951 output low levels be a symbol to 4QAM mapping block 955,4QAM mapping block 955 finds out the IQ two-way constellation data output corresponding with the Bit data that receives in built-in 4QAM constellation mapping table.
Under the 4QAM-NR modulating mode, the accurate quadrature of NR shines upon per 8 Bit datas of unit 94 being exported by interleave unit 93 in advance and is mapped as 16 Bit datas, per 2 bits after the pre-mapping of NR are formed a symbol transmission to 4QAM mapping block 955, in built-in 4QAM constellation mapping table, find out the IQ two-way constellation data output corresponding by 4QAM mapping block 955 again with the Bit data that receives.
The embodiment of the invention is divided the modulating mode mapping again by LDPC coded-bit data stream is interweaved earlier uniformly, thereby can reduce the required memory space of interleaver significantly, following table has promptly been listed under the various modulating modes, the technical scheme that the prior art scheme and the embodiment of the invention provide is the required memory space (bitwise) of difference in interleaver, the x=52*51/2=1326 in the table.
When interweave and constellation mapping under various modulating modes when multiplexing, then savable resource is respectively 25% (64QAM), 40% (32QAM), 25% (16QAM), 40% (4QAM), 40% (4QAM-NR).
Therefore, need memory capacity all to have significantly when in either case interweaving and reduce, and maximum can reach the memory capacity of saving 90% (8.6Mb) under the single-mode.The memory space of needs is huge owing to interweave, therefore be difficult to inner realization at FPGA, need outside RAM to store, no matter be outside SRAM or outside DRAM, all can only use the memory device of 16bit bit wide in the prior art or a constellation storage in two 8bit memory cell, and the technical scheme that the embodiment of the invention provides only needs the memory device of 8bit bit wide to get final product, thereby can greatly improve the utilance of memory device, and can also reduce production costs.
In addition, in the 4QAM-NR modulation, the realization of prior art is to interweave preceding, constellation mapping after, just opposite with other modulation system, so can not well carry out module reuse, and need independent establishment to interweave or the constellation mapping module, increase the consumption of resource and handled complexity.The technical scheme that the embodiment of the invention provides makes processing sequence reach unanimity, can realize the multiplexing of functional module by the control of software, realizes sharing of resource, has further reduced the resource and the power consumption of whole system.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the mapping of a digital television ground broadcast signal and deinterleaving method is characterized in that, described method comprises the steps:
A, obtain and corresponding interlace mode information and the modulation mode information of importing of LDPC coded-bit data;
B, according to described interlace mode information described LDPC coded-bit data are interweaved by corresponding interlace mode, be specially: for 64QAM, per according to this 6 Bit datas of described LDPC number of coded bits are one group to interweave by corresponding interlace mode, for 32QAM, with per according to this 5 Bit datas of described LDPC number of coded bits is one group, and mend 1 " 0 " in the high position of this 5 Bit data, with these 6 Bit datas of mending after 0 is that base unit interweaves by corresponding interlace mode, for 16QAM, with per according to this 4 Bit datas of described LDPC number of coded bits is one group, and mend 2 " 0 " in the high position of this 4 Bit data, with these 6 Bit datas of mending after 0 is that base unit interweaves by corresponding interlace mode, for 4QAM, with per according to this 2 Bit datas of described LDPC number of coded bits is one group, and mend 4 " 0 " in the high position of this 2 Bit data, with these 6 Bit datas of mending after 0 is that base unit interweaves by corresponding interlace mode, for 4QAM-NR, with per according to this 1 Bit data of described LDPC number of coded bits is one group, and, be that base unit interweaves by corresponding interlace mode with these 6 Bit datas of mending after 0 in 5 " 0 " of high position benefit of this 1 Bit data;
C, according to described modulation mode information, when described modulating mode is a kind of among 64QAM, 32QAM, 16QAM, the 4QAM, Bit data after then will interweaving directly carries out the constellation mapping of corresponding modulating mode, and when described modulating mode is 4QAM-NR, Bit data after then will interweaving carries out the accurate quadrature of NR earlier and shines upon in advance, carries out the constellation mapping of 4QAM again.
2. the mapping of digital television ground broadcast signal as claimed in claim 1 and deinterleaving method, it is characterized in that, described step C specifically comprises: when described modulating mode is a kind of among 64QAM, 32QAM, 16QAM, the 4QAM, Bit data after will interweaving is that elementary cell is directly carried out and the corresponding constellation mapping of described modulating mode with every group with the corresponding number of bits of described modulating mode, wherein, with described 4 kinds of modulating modes under corresponding respectively every group of number of bits be 64QAM → 6,32QAM → 5,16QAM → 4,4QAM → 2; When described modulating mode was 4QAM-NR, the Bit data after will interweaving was that unit carries out the accurate quadrature of NR earlier and shines upon in advance with every group 8 bit, is the constellation mapping that unit carries out 4QAM with the Bit data after the pre-mapping of NR with every group 2 bit again.
3. the mapping of digital television ground broadcast signal as claimed in claim 1 and deinterleaving method is characterized in that, described step C specifically comprises: for 64QAM, per 6 bits of the back output that will interweave are a symbol, carry out the constellation mapping of 64QAM; For 32QAM, low 5 bits of getting in per 6 bits of exporting the back that interweaves are a symbol, carry out the constellation mapping of 32QAM; For 16QAM, low 4 bits of getting in per 6 bits of exporting the back that interweaves are a symbol, carry out the constellation mapping of 16QAM; For 4QAM, low 2 bits of getting in per 6 bits of exporting the back that interweaves are a symbol, carry out the constellation mapping of 4QAM.
4. the mapping of a digital television ground broadcast signal and interlacing system, it is characterized in that, described system comprises: control unit, bit are chosen unit, interleave unit, constellation mapping unit and the accurate quadrature of NR and are shone upon the unit in advance, and described bit is chosen the unit and comprised shift register and shift counter; Interlace mode information and modulation mode information that described control unit reception and storage are corresponding with current LDPC coded-bit data, and control the cycle count that described shift counter carries out the number of times corresponding with described modulating mode according to described modulation mode information, when described modulating mode is respectively 64QAM, 32QAM, 16QAM, 4QAM, during 4QAM-NR, corresponding cycle count number of times is respectively 6,5,4,2,1, described shift register is deposited described LDPC coded-bit data, described shift counter is controlled described shift register and the current Bit data of depositing of line output when counting is full, 6 parallel Bit datas of the unified output of described shift register, during Bit data number less than 6 bits deposited when described shift register is current, the high order bit of 6 Bit datas of output is all put 0; Described interleave unit is under the control of described control unit, interweave according to corresponding interlace mode according to the elite Bit data of getting unit output of described interlace mode information contrast, and the data after will interweaving according to described modulation mode information export to described constellation mapping unit or the accurate quadrature of NR shines upon the unit in advance; The accurate quadrature of described NR shines upon the unit in advance to carry out exporting after the accurate quadrature of NR shines upon in advance to Bit data; Described constellation mapping unit is under the control of described control unit, according to described modulation mode information the Bit data of described interleave unit output is carried out the constellation mapping of 64QAM, 32QAM, 16QAM or 4QAM, or the Bit data that the accurate quadrature of described NR shines upon unit output is in advance carried out the constellation mapping of 4QAM.
5. the mapping of digital television ground broadcast signal as claimed in claim 4 and interlacing system, it is characterized in that, described constellation mapping unit comprises register, the 64QAM mapping block, the 32QAM mapping block, 16QAM mapping block and 4QAM mapping block, described register is deposited 6 Bit datas of the each output of described interleave unit, and under control, according to being positioned at low level and the Bit data corresponding number of described modulating mode in the current data of depositing of described modulation mode information output to corresponding 64QAM mapping block at described control unit, the 32QAM mapping block, 16QAM mapping block or 4QAM mapping block.
6. one kind comprises the mapping of digital television ground broadcast signal as claimed in claim 4 and the reflector of interlacing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100459483A CN101345738B (en) | 2008-08-29 | 2008-08-29 | Mapping and interweaving method and system for digital television ground broadcast signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100459483A CN101345738B (en) | 2008-08-29 | 2008-08-29 | Mapping and interweaving method and system for digital television ground broadcast signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101345738A CN101345738A (en) | 2009-01-14 |
| CN101345738B true CN101345738B (en) | 2011-07-27 |
Family
ID=40247628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100459483A Active CN101345738B (en) | 2008-08-29 | 2008-08-29 | Mapping and interweaving method and system for digital television ground broadcast signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101345738B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854327B (en) * | 2010-06-11 | 2012-08-22 | 山东大学 | Self-adaptive demodulating method for multi-carrier system |
| EP2525497A1 (en) * | 2011-05-18 | 2012-11-21 | Panasonic Corporation | Bit-interleaved coding and modulation (BICM) with quasi-cyclic LDPC codes |
| EP2536030A1 (en) * | 2011-06-16 | 2012-12-19 | Panasonic Corporation | Bit permutation patterns for BICM with LDPC codes and QAM constellations |
| CN102437896B (en) * | 2011-11-10 | 2014-08-27 | 北京市北康晟电子技术有限公司 | Bit interleaving and constellation mapping method and apparatus thereof |
| CN103888399A (en) * | 2012-12-20 | 2014-06-25 | 中山大学深圳研究院 | Quadrature amplitude modulation soft de-mapping method |
| GB201312243D0 (en) | 2013-07-08 | 2013-08-21 | Samsung Electronics Co Ltd | Non-Uniform Constellations |
| WO2017011946A1 (en) * | 2015-07-17 | 2017-01-26 | 华为技术有限公司 | Unequal error protection-based data transmission method, apparatus and device |
| CN109067467B (en) * | 2018-09-26 | 2021-06-01 | 南京信息工程大学 | N-level array forming photoproduction W wave band transmitting method based on internal and external joint coding |
| CN113242084B (en) * | 2021-05-11 | 2022-01-11 | 西安电子科技大学 | Parallel self-adaptive interleaving/de-interleaving method for second generation digital satellite broadcasting system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1960357A (en) * | 2006-10-20 | 2007-05-09 | 北京泰美世纪科技有限公司 | Multicarrier digital mobile multimedia broadcast system, and digital information transmission method |
| CN101009785A (en) * | 2007-01-30 | 2007-08-01 | 北京航空航天大学 | Constellation mapping and interweaving method and device in the digital TV system |
| CN101047840A (en) * | 2006-04-18 | 2007-10-03 | 华为技术有限公司 | Channel interleaving method and system in hand TV system |
-
2008
- 2008-08-29 CN CN2008100459483A patent/CN101345738B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047840A (en) * | 2006-04-18 | 2007-10-03 | 华为技术有限公司 | Channel interleaving method and system in hand TV system |
| CN1960357A (en) * | 2006-10-20 | 2007-05-09 | 北京泰美世纪科技有限公司 | Multicarrier digital mobile multimedia broadcast system, and digital information transmission method |
| CN101009785A (en) * | 2007-01-30 | 2007-08-01 | 北京航空航天大学 | Constellation mapping and interweaving method and device in the digital TV system |
Non-Patent Citations (2)
| Title |
|---|
| 马乾.浅谈有线数字电视中的信道编码及QAM调制技术.《有线电视技术》.2006,(第199期),49-53. * |
| 龙光利.《基于FPGA的交织编码器的设计》.《江汉大学学报》.2005,第33卷(第3期), * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101345738A (en) | 2009-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101345738B (en) | Mapping and interweaving method and system for digital television ground broadcast signal | |
| CN103401830B (en) | Data processing equipment and method | |
| JP3748550B2 (en) | Interleaving apparatus and method for symbol mapping in high speed downlink packet access mobile communication system | |
| CN100499380C (en) | Device and method for intersecting code and decode | |
| JP7273075B2 (en) | Communication method | |
| CN101453221B (en) | Mapper based on bit weaving code modulation system and mapping process thereof | |
| CN103797724B (en) | Time-variable data displacement apparatus and method | |
| CN106059974A (en) | Transmission method, transmitter, reception method, and receiver | |
| US7594160B2 (en) | Apparatus and method for receiving signal in a communication system | |
| CN103236902B (en) | Constellation mapping, de-mapping method, coded modulation and decoding demodulating system | |
| CN104618068B (en) | Bit Interleaved Coded Modulation device and method for wireless broadcast communication system | |
| CN108551384A (en) | The radio data transmission method of gigabit rate magnitude parallel encoding and modulation | |
| TWI602398B (en) | Optimized code table signaling | |
| CN101986584A (en) | Rate de-matching device and method in 3GPP LTE | |
| CN101902303A (en) | Device and method for realizing multiplexing of interleaving and de-interleaving | |
| CN107566312A (en) | A kind of quadrature amplitude modulation method and device based on loop iteration coding | |
| CN104426630A (en) | Method and system for bit interleaving encoding and modulation | |
| CN105359509A (en) | Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals | |
| CN101461166B (en) | Methods and apparatus for dynamic packet reordering | |
| CN105656833B (en) | Non-uniformly modulated method in NGB-W systems | |
| CN103460607B (en) | The apparatus and method conciliating mapping signal are mapped in the communication system using low density parity check code | |
| CN101237440B (en) | A data interweaving method and device | |
| CN100463506C (en) | Constellation mapping and interweaving method and device in the digital TV system | |
| CN102437896B (en) | Bit interleaving and constellation mapping method and apparatus thereof | |
| CN101242190B (en) | Time de-interweaving method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 610041 No. 56, fat street, Chengdu City, Sichuan Province Patentee after: Chengdu core digital Polytron Technologies Inc Address before: 610041 No. 56, fat street, Chengdu City, Sichuan Province Patentee before: Chengdu Dexin Digital Technology Co., Ltd. |