CN101197958B - Demapping device and method in digital television ground system - Google Patents
Demapping device and method in digital television ground system Download PDFInfo
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- CN101197958B CN101197958B CN2007101796827A CN200710179682A CN101197958B CN 101197958 B CN101197958 B CN 101197958B CN 2007101796827 A CN2007101796827 A CN 2007101796827A CN 200710179682 A CN200710179682 A CN 200710179682A CN 101197958 B CN101197958 B CN 101197958B
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Abstract
The invention provides a demapping device and a demapping method in a digital television ground system, wherein, a receiver implements demapping of information bits by utilization of logic rules between constellation symbols and the information bits according to five constellation mapping modes of 4QAM, 4QAM-NR, 16QAM, 32QAM and 64QAM in Digital Terrestrial Television Broadcasting Transmission Standards, and demapping bit aggregates of various modes are obtained, and then corresponding demapping bit outputs are extracted from the demapping bit aggregates according to the current QAM mapping mode which is recovered on the front end of the receiver. The device and the method which are provided by the invention mainly have the advantages of capability of implementing demapping which supports an international full-mode, capability of greatly saving hardware resources and simultaneously improvement of processing speed of the system.
Description
Technical field
The invention belongs to the digital TV Broadcasting Techniques field, be specifically related to the receiver treatment technology in a kind of digital terrestrial television transmission system, separate mapping device and its method in particularly a kind of digital television system.
Background technology
Digital tv ground broadcasting has constituted China with Digital Television broadcasting-satellite system, Digital Television wired broadcast system and other auxiliary systems and has broadcasted comprehensive nerve of a covering as the chief component in the radio data system.Digital television ground broadcast transmission system not only has the basic function of supporting the conventional digital TV broadcast service, but also possesses the extendable functions that adapts to radio and television services, promptly supports fixing (comprising indoor and outdoor) reception and moves the two kinds of patterns that receive.Fixedly in the receiving mode, can provide single-definition digital television business, high definition digital television business, digital audio broadcasting service, multimedia broadcasting and data service business etc.In the mobile receiving mode, can provide single-definition digital television business, digital audio broadcasting service, multimedia broadcasting and data service business etc.Multiple services mixed mode, and the diversity of network environment, digital tv ground broadcasting possess the matched and the flexibility of traffic performance and transmission mode.Therefore, China Digital TV terrestrial broadcast system transmission standard is supported multiple constellation mapping pattern, i.e. 4QAM, 4QAM-NR, 16QAM, 32QAM, 64QAM.
The characteristics of quadrature amplitude modulation (Quadrature Amplitude Modulation abbreviates QAM as) are the modulation efficiency height, can improve the availability of frequency spectrum greatly.Multiple mapped mode at the requirement of China Digital TV terrestrial broadcast system transmission standard, adopt look-up table method that present receiver realizes being adopted as de-mapping method, increased complexity in design, expend a lot of hardware resources in realization, be unfavorable for the miniaturization of receiver, and the processing speed of system has been subjected to certain restriction.
Summary of the invention
The present invention utilizes constellation symbol in the multi-mode mapping and the rule between the information bit, make full use of SOC (system on a chip) (Systemon Chip, abbreviate SoC as) design philosophy, the mapping algorithm of separating of a kind of 4QAM of support, 4QAM-NR, 16QAM, 32QAM, the many mapped modes of 64QAM has been proposed, not only saved hardware resource greatly, arithmetic speed has obtained significant lifting simultaneously.
The objective of the invention is to, provide and separate mapping device and its method in a kind of digital television ground system, this device and its method are supported the multiple mapped mode in China Digital TV ground transmission standard, occupy that resource is few, system speed is fast.
Separate mapping device in a kind of digital television ground system provided by the invention, form by the mapper between the signal converter between quadrant, symbol and bit, bit selector.Wherein, homophase symbol I, orthogonal symbols Q are connected to the input of the signal converter between quadrant, the output of the signal converter between quadrant is connected to the input of the mapper between symbol and bit, the output of the mapper between symbol and bit is connected to an input of bit selector, current QAM mapped mode is connected to another input of bit selector, and the output of bit selector is exported as the last mapped bits of separating.
Signal converter between described quadrant is finished homophase symbol I, orthogonal symbols Q that receiver is received and is carried out the conversion of place constellation quadrant and first quartile, thereby forms the symbol II of first quartile, the function of QQ;
Mapper between described symbol and bit is finished homophase symbol II, the orthogonal symbols QQ that will be transformed into behind the first quartile, according to the symbol in 4QAM, 4QAM-NR, 16QAM, 32QAM, the 64QAM mapped mode constellation and the logical expression between the information bit after separating mapping, separate and be mapped to corresponding information bit, form the function of separating the mapped bits set.
Described bit selector is finished according to current QAM mapped mode, and the output of the mapper between symbol and bit is separated the mapped bits set, extracts corresponding bit, forms the function of separating mapped bits output:
(1) when 4QAM, 16QAM, 32QAM or 64QAM mapped mode, extract corresponding bit, form and separate mapped bits output;
(2) when the 4QAM-NR mapped mode, extract corresponding bit,, behind the NR decoder of 8 bits, form and separate mapped bits output through 16 bits.
De-mapping method in a kind of digital television ground system provided by the invention, this method may further comprise the steps:
(1) homophase symbol I, the orthogonal symbols Q that receiver is received carries out the conversion of place constellation quadrant and first quartile, makes the symbol of input become symbol II, the QQ of first quartile;
(2) according to the symbol in 4QAM, 4QAM-NR, 16QAM, 32QAM, the 64QAM mapped mode constellation and the logical expression between the information bit after separating mapping, the II, the QQ symbol de-maps that are transformed into first quartile are arrived corresponding information bit, form and separate the mapped bits set;
(3),, form and separate mapped bits output from the bit of separating selection correspondence the mapped bits set that second step obtained according to current QAM mapped mode.
The present invention supports all mapped modes in the Digital Television Terrestrial Broadcasting transmission national standard, and the advantage of this device and its method is:
(1) provides an integration module to support multi-mode to separate mapping, realized resource multiplex to the full extent, made full use of the logical laws between constellation symbol and the information bit, thereby saved hardware resource greatly;
(2) processing speed of system has obtained significant lifting.
Description of drawings
Fig. 1 is for separating the theory diagram of mapping device among the present invention;
Fig. 2 is the signal converter circuit between the quadrant of separating mapping device among the present invention;
Fig. 3 separates the symbol of mapping device and the mapper circuit between bit among the present invention;
The bit selector circuit of Fig. 4 for separating mapping device among the present invention;
Fig. 5 is for separating the NR decoder circuit of mapping device among the present invention;
Fig. 6 is the flow chart of de-mapping method among the present invention;
Fig. 7 is 4QAM constellation mapping figure among the present invention;
Fig. 8 is 16QAM constellation mapping figure among the present invention;
Fig. 9 is 32QAM constellation mapping figure among the present invention;
Figure 10 is 64QAM constellation mapping figure among the present invention;
Figure 11 A separates logical relation Karnaugh map between b1 and I in the mapping, the Q symbol for 4QAM among the present invention;
Figure 11 B separates logical relation Karnaugh map between b0 and I in the mapping, the Q symbol for 4QAM among the present invention;
Figure 12 A separates logical relation Karnaugh map between b3 and I in the mapping, the Q symbol for 16QAM among the present invention;
Figure 12 B separates logical relation Karnaugh map between b2 and I in the mapping, the Q symbol for 16QAM among the present invention;
Figure 12 C separates logical relation Karnaugh map between b1 and I in the mapping, the Q symbol for 16QAM among the present invention;
Figure 12 D separates logical relation Karnaugh map between b0 and I in the mapping, the Q symbol for 16QAM among the present invention;
Figure 13 A separates logical relation Karnaugh map between b4 and I in the mapping, the Q symbol for 32QAM among the present invention;
Figure 13 B separates logical relation Karnaugh map between b3 and I in the mapping, the Q symbol for 32QAM among the present invention;
Figure 13 C separates logical relation Karnaugh map between b2 and I in the mapping, the Q symbol for 32QAM among the present invention;
Figure 13 D separates logical relation Karnaugh map between b1 and I in the mapping, the Q symbol for 32QAM among the present invention;
Figure 13 E separates logical relation Karnaugh map between b0 and I in the mapping, the Q symbol for 32QAM among the present invention;
Figure 14 A separates logical relation Karnaugh map between b5 and I in the mapping, the Q symbol for 64QAM among the present invention;
Figure 14 B separates logical relation Karnaugh map between b4 and I in the mapping, the Q symbol for 64QAM among the present invention;
Figure 14 C separates logical relation Karnaugh map between b3 and I in the mapping, the Q symbol for 64QAM among the present invention;
Figure 14 D separates logical relation Karnaugh map between b2 and I in the mapping, the Q symbol for 64QAM among the present invention;
Figure 14 E separates logical relation Karnaugh map between b1 and I in the mapping, the Q symbol for 64QAM among the present invention;
Figure 14 F separates logical relation Karnaugh map between b0 and I in the mapping, the Q symbol for 64QAM among the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, separate mapping device in a kind of digital television ground system provided by the invention, form by the mapper between the signal converter between quadrant 1, symbol and bit 2, bit selector 3.The order of connection of each module is: homophase symbol I, orthogonal symbols Q are as the input of the signal converter between quadrant 1, the output bound symbol of the signal converter 1 between quadrant and the input of the mapper 2 between bit, the output of the mapper 2 between symbol and bit is connected to an input of bit selector 3, current QAM mapped mode is connected to another input of bit selector 3, and the output of bit selector 3 is connected to separates mapped bits output.Wherein, the signal converter between quadrant 1 is finished homophase symbol I, the orthogonal symbols Q road translation function to first quartile symbol II, QQ; Mapper 2 between symbol and bit is according to the symbol in the various QAM mapped mode constellations and the logical expression between the information bit after separating mapping, the II, the QQ symbol de-maps that are transformed into first quartile are arrived corresponding information bit, thereby form the corresponding function of separating the mapped bits set; Bit selector 3 is finished according to current QAM mapped mode, and the output of the mapper 2 between symbol and bit is separated the mapped bits set, extracts corresponding bit, forms the function of separating mapped bits output.
The function of each module and specific implementation details are described below among Fig. 1:
As shown in Figure 2, signal converter 1 between quadrant is by first separator 4, second separator 5, the 7th not gate 6, the 8th not gate 7, the first alternative selector 8, the second alternative selector 9 are formed, and finish I, the Q road symbol translation function to first quartile symbol II, QQ.Described homophase symbol I and orthogonal symbols Q represent with 3 bit-complement forms respectively.The significance bit of different Q AM mapped mode corresponding I, Q sees Table 1, wherein, and the sign bit on the permanent expression of I2, Q2 I, Q road.The symbolic representation of first quartile symbol homophase is II=II2II1II0, and orthogonal symbols is expressed as QQ=QQ2QQ 1QQ0.
The course of work of the signal converter 1 between quadrant is: when the highest sign bit of homophase symbol (or orthogonal symbols) was ' 1 ', inversion operation was carried out in the low order of homophase symbol (or orthogonal symbols); When the highest sign bit of homophase symbol (or orthogonal symbols) was ' 0 ', any operation was not carried out in the low order of homophase symbol (or orthogonal symbols).
Table 1
The specific implementation details of the signal converter 1 between quadrant is:
As shown in Figure 3, mapper 2 between symbol and bit by first not gate 10, second not gate 13, the 3rd not gate 17, the 4th not gate 19, the 5th not gate 20, the 6th not gate 22, first XOR gate 16, second XOR gate 18, the 3rd XOR gate 21, first and door 11, second with door 14, first or door 12, second or 15 form, finish first quartile symbol II, the QQ that will obtain by the signal converter between quadrant 1, be transformed into the corresponding function of separating mapped bits set d8d7d6d5d4d3d2d 1d0.II=II2II1II0 wherein, QQ=QQ2QQ1QQ0.
The course of work of the mapper 2 between symbol and bit is: according to the logical expression between symbol in the table 4 and the set of homographic solution mapped bits, the corresponding mapped bits of separating is gathered d8d7d6d5d4d3d2d1d0.
The specific implementation details of the mapper 2 between symbol and bit is:
The input II1 that is input as the mapper 2 between symbol and bit of first not gate 10, the output of first not gate 10 be connected to first with a door input of 11; First and another of door 11 be input as the input QQ0 of the mapper 2 between symbol and bit, first is connected to first or an input of door 12 with door 11 output; First or another of door 12 be input as the input QQ1 of the mapper 2 between symbol and bit, first or door 12 output be connected to the output d8 of the mapper 2 between symbol and bit;
The input QQ0 that is input as the mapper 2 between symbol and bit of second not gate 13, the output of second not gate 13 be connected to second with a door input of 14; Second and another of door 14 be input as the input II1 of the mapper 2 between symbol and bit, second is connected to second or an input of door 15 with door 14 output; Second or another of door 15 be input as the input II0 of the mapper 2 between symbol and bit, second or door 15 output be connected to the output d7 of the mapper 2 between symbol and bit;
An input II1 who is input as the mapper 2 between symbol and bit of first XOR gate 16, another of first XOR gate 16 is input as the input QQ1 of the mapper 2 between symbol and bit, and first XOR gate 16 is output as the output d6 of the mapper 2 between symbol and bit;
The input II2 that is input as the mapper 2 between symbol and bit of the 3rd not gate 17, the 3rd not gate 17 is output as the output d5 of the mapper 2 between symbol and bit;
An input II0 who is input as the mapper 2 between symbol and bit of second XOR gate 18, another of second XOR gate 18 is input as the input II1 of the mapper 2 between symbol and bit, and second XOR gate 18 is output as the output d4 of the mapper 2 between symbol and bit;
The input II1 that is input as the mapper 2 between symbol and bit of the 4th not gate 19, the 4th not gate 19 is output as the output d3 of the mapper 2 between symbol and bit;
The input QQ1 that is input as the mapper 2 between symbol and bit of the 5th not gate 20, the 5th not gate 20 is output as the output d2 of the mapper 2 between symbol and bit;
An input QQ0 who is input as the mapper 2 between symbol and bit of the 3rd XOR gate 21, another of the 3rd XOR gate 21 is input as the input QQ1 of the mapper 2 between symbol and bit, and the 3rd XOR gate 21 is output as the output d1 of the mapper 2 between symbol and bit;
The input QQ2 that is input as the mapper 2 between symbol and bit of the 6th not gate 22, the 6th not gate 22 is output as the output d0 of the mapper 2 between symbol and bit.
As shown in Figure 4, bit selector 3 selects a selector 23, NR decoder 24 to form by five, finishes the mapped mode of determining current sign according to system information, thereby forms the final function of separating mapped bits output.
The course of work of bit selector 3 is: according to separating mapped bits set and the corresponding relation of separating between the mapped bits output in the table 5, according to current QAM mapped mode, select corresponding bit to form to separate mapped bits to export.
The specific implementation details of bit selector 3 is:
The output d0d5 of the mapper 2 between symbol and bit is connected to the input of NR decoder 24, the output of NR decoder 24 is connected to the five input 23b that select a selector 23, the output d0d5 of the mapper 2 between symbol and bit is connected to the five input 23a that select a selector 23, the output d0d2d5d3 of the mapper 2 between symbol and bit is connected to the five input 23c that select a selector 23, the output d6d0d7d5d8 of the mapper 2 between symbol and bit is connected to the five input 23d that select a selector 23, the output d0d2d1d5d3d4 of the mapper 2 between symbol and bit is connected to the five input 23e that select a selector 23, and five select a selector 23 to be output as the output of bit selector 3.Wherein, five select the course of work of a selector 23 to be: when current QAM mapped mode was 4QAM, five selected a selector 23 input 23a to be connected to the output of bit selector 3; When current QAM mapped mode was 4QAM-NR, five selected a selector 23 input 23b to be connected to the output of bit selector 3; When current QAM mapped mode was 16QAM, five selected a selector 23 input 23c to be connected to the output of bit selector 3; When current QAM mapped mode was 32QAM, five selected a selector 23 input 23d to be connected to the output of bit selector 3; When current QAM mapped mode was 64QAM, five selected a selector 23 input 23e to be connected to the output of bit selector 3.
As shown in Figure 5, NR decoder 24 is made up of controlled follower 25, mould 8 counters 26, finishes the NR decoding function of 16 bits to 8 bits.Wherein, mould 8 counters 26 are 8 counter for mould, and the relation of its output and inner count status sees Table 2:
Table 2
The specific implementation details of NR decoder 24 is:
Width is the input of the NR decoder 24 of 2bit, is connected to an input of controlled follower 25, and the output of mould 8 counters 26 is connected to another input of controlled follower 25, and the output of controlled follower 25 is as the output of NR decoder 24.Wherein, when mould 8 counters 26 were output as ' 1 ', controlled follower 25 was connected to the input of NR decoder 24 output of NR decoder 24; When mould 8 counters 26 are output as ' 0 ', controlled follower 25 output invalid datas.
As shown in Figure 6, the de-mapping method in a kind of digital television ground system provided by the invention, the specific implementation step is:
The first step: homophase symbol I, orthogonal symbols Q that receiver is received carry out the conversion of place constellation quadrant and first quartile, make the symbol of input become the first quartile symbol, concrete operations are for carrying out the low order of homophase symbol, orthogonal symbols the conversion between complement code and the true form, promptly according to the difference of high sign bit of homophase symbol, orthogonal symbols, inversion operation is carried out in low order to homophase symbol, orthogonal symbols, when the highest sign bit was ' 1 ', inversion operation was carried out in low order; When the highest sign bit was ' 0 ', any operation was not carried out in low order.
Second step: the logical expression between the information bit after setting up symbol in 4QAM, 4QAM-NR, 16QAM, 32QAM, the 64QAM mapped mode constellation and separating mapping, see table 3 for details; Consider that the bit between many mapped modes can be multiplexing, identic logical expression in the his-and-hers watches 3 under the different mappings pattern merges and abbreviation, promptly only keep an expression formula, the expression formula that rejecting repeats, the minimum form of the logical expression between the information bit after obtaining symbol in the various mapped mode constellations and separating mapping sees table 4 for details.According to table 4, separate the mapped bits set to various mapped mode correspondences with being transformed into symbol de-maps behind the first quartile.Wherein the derivation of table 3, table 4 is:
Utilize as shown in Figure 7 4QAM mapped mode constellation and the 4QAM homophase symbol in the table 1, the significance bit representation of orthogonal symbols, Karnaugh map between the information bit b1b0 after can setting up homophase symbol, the orthogonal symbols shown in Figure 11 A-11B and separating mapping, (minterm that promptly has adjacency can merge according to Karnaugh map abbreviation method, and the different factor of cancellation, form the minimum form of expression formula), thereby the logical expression between the information bit after obtaining the symbol under the 4QAM mapped mode and separating mapping sees Table 3.
Utilize as shown in Figure 8 16QAM mapped mode constellation and the 16QAM homophase symbol in the table 1, the significance bit representation of orthogonal symbols, Karnaugh map between the information bit b3b2b1b0 after can setting up homophase symbol, the orthogonal symbols shown in Figure 12 A-12D and separating mapping, according to Karnaugh map abbreviation method, thereby the logical expression between the information bit after obtaining the symbol under the 16QAM mapped mode and separating mapping sees Table 3.
Utilize as shown in Figure 9 32QAM mapped mode constellation and the 32QAM homophase symbol in the table 1, the significance bit representation of orthogonal symbols, Karnaugh map between the information bit b4b3b2b 1b0 after can setting up homophase symbol, the orthogonal symbols shown in Figure 13 A-13E and separating mapping, according to Karnaugh map abbreviation method, thereby the logical expression between the information bit after obtaining the symbol under the 32QAM mapped mode and separating mapping sees Table 3.
Utilize as shown in figure 10 64QAM mapped mode constellation and the 64QAM homophase symbol in the table 1, the significance bit representation of orthogonal symbols, Karnaugh map between the information bit b5b4b3b2b1b0 after can setting up homophase symbol, the orthogonal symbols shown in Figure 14 A-14F and separating mapping, according to Karnaugh map abbreviation method, thereby the logical expression between the information bit after obtaining the symbol under the 64QAM mapped mode and separating mapping sees Table 3.
Since 4QAM-NR mapped mode symbol down with separate mapping after information bit between logical expression identical with the 4QAM mapped mode, so no longer the 4QAM-NR mapped mode is illustrated separately here.
Table 3
In the table 3, have the logical expression of identical expression-form for equal sign the right, only keep an expression formula, reject the expression formula that repeats, thereby the minimum form of the logical expression between the information bit after obtaining the symbol under each mapped mode and separating mapping sees Table 4:
Table 4
The 3rd step: according to current QAM mapped mode,, search, select corresponding bit to form and separates mapped bits output according to table 5 from separating the mapped bits set of obtaining of second step.
Under the described current QAM mapped mode, separate bit corresponding in the mapped bits set and separate mapped bits output corresponding relation, see Table 5:
Table 5
Claims (12)
1. separate mapping device in the digital television ground system, it is characterized in that:
This device is by the signal converter between quadrant, mapper between symbol and bit, the bit selector is formed, wherein, homophase symbol I, orthogonal symbols Q is connected to the input of the signal converter (1) between quadrant, the output of the signal converter between quadrant (1) is connected to the input of the mapper (2) between symbol and bit, the output of the mapper between symbol and bit (2) is connected to an input of bit selector (3), current QAM mapped mode is connected to another input of bit selector (3), and the output of bit selector (3) is exported as the last mapped bits of separating;
Wherein, the concrete operations of the signal converter between quadrant (1) are: when the highest sign bit of homophase symbol I or orthogonal symbols Q is ' 1 ', inversion operation is carried out in low order to homophase symbol I or orthogonal symbols Q, when the highest sign bit of homophase symbol I or orthogonal symbols Q is ' 0 ', any operation is not carried out in the low order of homophase symbol I or orthogonal symbols Q;
The concrete operations of the mapper between symbol and bit (2) are: be accomplished to the conversion of d8d7d6d5d4d3d2d1d0 bit set according to following rule through the output of the signal converter (1) between quadrant:
Highest order logical inverse computing in the output orthogonal symbol of the signal converter between quadrant (1) obtains d0;
Left side in the output orthogonal symbol of the signal converter between quadrant (1) is played a left side in the output orthogonal symbol of the signal converter (1) between the 3rd and quadrant and is played second and carry out the logical difference exclusive disjunction, and the result of logical difference exclusive disjunction is d1;
Second logical inverse computing played on the left side of the output orthogonal symbol of the signal converter between quadrant (1), obtains d2;
Second logical inverse computing played on the left side of the output homophase symbol of the signal converter between quadrant (1), obtains d3;
Left side in the output homophase symbol of the signal converter between quadrant (1) is played a left side in the output homophase symbol of the signal converter (1) between the 3rd and quadrant and is played second and carry out the logical difference exclusive disjunction, and the result of logical difference exclusive disjunction is d4;
The highest order logical inverse computing of the output homophase symbol of the signal converter between quadrant (1) obtains d5;
Left side in the output homophase symbol of the signal converter between quadrant (1) is played a left side in the output orthogonal symbol of the signal converter (1) between second and quadrant and is played second and carry out the logical difference exclusive disjunction, and the result of logical difference exclusive disjunction is d6;
Left side in the output orthogonal symbol of the signal converter between quadrant (1) is risen after the 3rd the logical inverse computing and the left side in the output homophase symbol of the signal converter between quadrant (1) is played second and carried out disjunction operation, then and the left side in the output homophase symbol of the signal converter between quadrant (1) play the 3rd and carry out the logic OR computing, obtain d7;
Left side in the output homophase symbol of the signal converter between quadrant (1) is risen after second logical inverse computing and the left side in the output orthogonal symbol of the signal converter between quadrant (1) is played the 3rd and carried out disjunction operation, then and the left side in the output orthogonal symbol of the signal converter between quadrant (1) play second and carry out the logic OR computing, obtain d8;
The concrete operations of bit selector (3) are: select corresponding bit to form according to current QAM mapped mode and following rule and separate mapped bits output:
When current QAM mapped mode is 4QAM, select the output of d0d5 as bit selector (3);
When current QAM mapped mode was 4QAM-NR, the intermediate object program that selection d0d5 process NR decoder (24) obtains was as the output of bit selector (3);
When current QAM mapped mode is 16QAM, select the output of d0d2d5d3 as bit selector (3);
When current QAM mapped mode is 32QAM, select the output of d6d0d7d5d8 as bit selector (3);
When current QAM mapped mode is 64QAM, select the output of d0d2d1d5d3d4 as bit selector (3).
2. separate mapping device in a kind of digital television ground system according to claim 1, it is characterized in that:
Signal converter between described quadrant (1) be input as homophase symbol I=I2I1I0, orthogonal symbols Q=Q2Q1Q0, be output as corresponding first quartile symbol II=II2II1II0, QQ=QQ2QQ1QQ0, II2=I2 wherein, QQ2=Q2; I1I0 obtains I1I0 through inversion operation, and Q1Q0 obtains Q1Q0 through inversion operation;
When I2 is high level, the output II1II0=I1I0 of the signal converter between quadrant (1);
When I2 is low level, the output II1II0=I1I0 of the signal converter between quadrant (1);
When Q2 is high level, the output QQ1QQ0=Q1Q0 of the signal converter between quadrant (1);
When I2 is low level, the output QQ1QQ0=Q1Q0 of the signal converter between quadrant (1).
3. separate mapping device in a kind of digital television ground system according to claim 1, it is characterized in that:
Mapper between described symbol and bit (2) be input as first quartile homophase symbol II=II2II1II0, orthogonal symbols QQ=QQ2QQ1QQ0, be output as and separate mapped bits set d8d7d6d5d4d3d2d1d0;
Mapper between described symbol and bit (2) by first not gate (10), second not gate (13), the 3rd not gate (17), the 4th not gate (19), the 5th not gate (20), the 6th not gate (22), first XOR gate (16), second XOR gate (18), the 3rd XOR gate (21), first and door (11), second with door (14), first or door (12), second or (15) form:
II1 through first not gate (10) back and QQ0 jointly through first with door (11) after and QQ1 jointly through first or (12), obtain exporting d8;
QQ0 through second not gate (13) back and II1 jointly through second with door (14) after and II0 jointly through second or (15), obtain exporting d7;
II1 and QQ1 through first XOR gate (16), obtain exporting d6 jointly;
II2 obtains exporting d5 through the 3rd not gate (17);
II0 and II1 through second XOR gate (18), obtain exporting d4 jointly;
II1 obtains exporting d3 through the 4th not gate (19);
QQ1 obtains exporting d2 through the 5th not gate (20);
QQ0 and QQ1 through the 3rd XOR gate (21), obtain exporting d1 jointly;
QQ2 obtains exporting d0 through the 6th not gate (22).
4. separate mapping device in a kind of digital television ground system according to claim 1, it is characterized in that:
Mapped bits set d8d7d6d5d4d3d2d1d0 is separated in an output that is input as the mapper (2) between described symbol and bit of described bit selector (3), and another is input as current QAM mapped mode, is output as to separate mapped bits output;
Described bit selector (3) selects a selector (23), NR decoder (24) to form by five:
When current QAM mapped mode was 4QAM, five selected a selector (23) to select the output of d0d5 as bit selector (3);
When current QAM mapped mode was 4QAM-NR, five selected a selector (23) to select the output as bit selector (3) of the intermediate object program that obtained through NR decoder (24) by d0d5;
When current QAM mapped mode was 16QAM, five selected a selector (23) to select the output of d0d2d5d3 as bit selector (3);
When current QAM mapped mode was 32QAM, five selected a selector (23) to select the output of d6d0d7d5d8 as bit selector (3);
When current QAM mapped mode was 64QAM, five selected a selector (23) to select the output of d0d2d1d5d3d4 as bit selector (3).
5. according to the mapping device of separating in claim 1 or the 4 described a kind of digital television ground systems, it is characterized in that: described NR decoder (24) is made up of controlled follower (25), mould 8 counters (26):
Controlled follower (25) be input as NR decoder (24) input, the output of controlled follower (25) is connected to NR decoder (24) output, the output of mould 8 counters (26) is connected to the controlled end of controlled follower (25);
When mould 8 counters (26) when being output as ' 1 ', controlled follower (25) is a pass-through state; When mould 8 counters (26) when being output as ' 0 ', controlled follower (25) is a blocked state.
6. application rights requires the de-mapping method in a kind of digital television ground system of 1 described device, it is characterized in that this method comprises the steps:
The first step: finish the symbol transition of other quadrants to first quartile according to the highest order of homophase symbol I, orthogonal symbols Q;
Conversion between complement code and the true form is carried out in the low order of homophase symbol, orthogonal symbols, promptly, inversion operation is carried out in the low order of homophase symbol, orthogonal symbols according to the difference of high sign bit of homophase symbol, orthogonal symbols;
When the highest sign bit was ' 1 ', inversion operation was carried out in low order; When the highest sign bit was ' 0 ', any operation was not carried out in low order;
Second step: the logical expression between the information bit after utilizing the symbol in the multiple QAM mapped mode planisphere and separating mapping, homophase symbol I, the orthogonal symbols Q that is transformed into first quartile carried out corresponding constellation separate mapping, the mapped bits of separating that obtains each pattern is gathered;
Concrete operations are: finish that according to following rule homophase symbol I, orthogonal symbols Q are transformed into the d8d7d6d5d4d3d2d1d0 bit set, described multiple QAM mapped mode comprises 4QAM, 4QAM-NR, 16QAM, 32QAM, five kinds of constellation mapping patterns of 64QAM:
Highest order logical inverse computing in the orthogonal symbols that the first step obtains obtains d0;
Left side in the output orthogonal symbol that the first step obtains is played second left side in the output orthogonal symbol that obtains with the first step and is played the 3rd and carry out the logical difference exclusive disjunction, and the result of logical difference exclusive disjunction is d1;
Second logical inverse computing played on the left side of the output orthogonal symbol that the first step obtains, and obtains d2;
Second logical inverse computing played on the left side of the output homophase symbol that the first step obtains, and obtains d3;
Left side in the output homophase symbol that the first step obtains is played second left side in the output homophase symbol that obtains with the first step and is played the 3rd and carry out the logical difference exclusive disjunction, and the result of logical difference exclusive disjunction is d4;
The highest order logical inverse computing of the output homophase symbol that the first step obtains obtains d5;
Left side in the output homophase symbol that the first step obtains is played second left side in the output orthogonal symbol that obtains with the first step and is played second and carry out the logical difference exclusive disjunction, and the result of logical difference exclusive disjunction is d6;
Left side in the output orthogonal symbol that the first step obtains is played a left side in the output homophase symbol that obtains with the first step after the 3rd the logical inverse computing and is played second and carry out disjunction operation, left side in the output homophase symbol that obtains with the first step is played the 3rd and is carried out the logic OR computing then, obtains d7;
Left side in the output homophase symbol that the first step obtains is played a left side in the output orthogonal symbol that obtains with the first step after second logical inverse computing and is played the 3rd and carry out disjunction operation, left side in the output orthogonal symbol that obtains with the first step is played second and is carried out the logic OR computing then, obtains d8;
The 3rd step:, from separate the mapped bits set, extract the corresponding mapped bits of separating and export according to current QAM mapped mode;
Its concrete operations are separated mapped bits output for select corresponding bit to form according to current QAM mapped mode and following rule:
When current QAM mapped mode is 4QAM, extract the d0d5 that second step obtained;
When current QAM mapped mode is 4QAM-NR, extract the d0d5 that second step obtained, then through NR decoding;
When current QAM mapped mode is 16QAM, extract the d0d2d5d3 that second step obtained;
When current QAM mapped mode is 32QAM, extract the d6d0d7d5d8 that second step obtained;
When current QAM mapped mode is 64QAM, extract the d0d2d1d5d3d4 that second step obtained.
7. the de-mapping method in a kind of digital television ground system according to claim 6, it is characterized in that: described 4QAM separates mapping, incoming symbol is expressed as with complement form: homophase symbol I=I2, orthogonal symbols Q=Q2, I2 wherein, Q2 is the sign bit of corresponding homophase symbol, orthogonal symbols respectively, and it is separated mapped bits output and is expressed as b1b0.
8. the de-mapping method in a kind of digital television ground system according to claim 6, it is characterized in that: described 4QAM-NR separates mapping, incoming symbol is expressed as with complement form: homophase symbol I=I2, orthogonal symbols Q=Q2, its information bit of separating after the mapping is deciphered through the NR of 16 bits to 8 bits, and it is separated mapped bits output and is expressed as b1b0.
9. the de-mapping method in a kind of digital television ground system according to claim 6, it is characterized in that: described 16QAM separates mapping, incoming symbol is expressed as with complement form: homophase symbol I=I2I1, orthogonal symbols Q=Q2Q1, I2 wherein, Q2 is the sign bit of corresponding homophase symbol, orthogonal symbols respectively, determines the place quadrant of this symbol, I1, Q1 are expressed as the low order of homophase symbol, orthogonal symbols respectively, and it is separated mapped bits output and is expressed as b3b2b1b0.
10. according to the de-mapping method in the described a kind of digital television ground system of claim 6, it is characterized in that: described 32QAM separates mapping, incoming symbol is expressed as with complement form, homophase symbol I=I2I1I0, orthogonal symbols Q=Q2Q1Q0, wherein I2, Q2 is the sign bit of corresponding homophase symbol, orthogonal symbols respectively, determine the place quadrant of this symbol, I1I0, Q1Q0 are expressed as the low order of homophase symbol, orthogonal symbols respectively, and it is separated mapped bits output and is expressed as b4b3b2b1b0.
11. the de-mapping method in a kind of digital television ground system according to claim 6, it is characterized in that: described 64QAM separates mapping, incoming symbol is expressed as with complement form, homophase symbol I=I2I1I0, orthogonal symbols Q=Q2Q1Q0, wherein I2, Q2 is the sign bit of corresponding homophase symbol, orthogonal symbols respectively, determine the place quadrant of this symbol, I1I0, Q1Q0 are expressed as the low order of homophase symbol, orthogonal symbols respectively, and it is separated mapped bits output and is expressed as b5b4b3b2b1b0.
12. the de-mapping method in a kind of digital television ground system according to claim 6, it is characterized in that: the symbol in the described planisphere and separate mapping after information bit between logical expression, by the Karnaugh map abbreviation, the logical expression between the information bit after obtaining the symbol under each mapped mode and separating mapping; For identic logical expression under the different mode, only keep one after the merging, and it is multiplexing jointly to be arranged to multi-mode.
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