CN102739366B - A kind of bit soft information cut position treating apparatus and method - Google Patents
A kind of bit soft information cut position treating apparatus and method Download PDFInfo
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- CN102739366B CN102739366B CN201210236213.5A CN201210236213A CN102739366B CN 102739366 B CN102739366 B CN 102739366B CN 201210236213 A CN201210236213 A CN 201210236213A CN 102739366 B CN102739366 B CN 102739366B
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Abstract
The invention discloses a kind of bit soft information cut position treating apparatus, it is characterized in that comprising: data extractor, receives the bit soft information of demapping output, and described bit soft information is separated into the soft information of data and the soft information of pilot tone; Bit position extractor, utilizes the soft information acquisition interception position of described pilot tone; Cut position device, according to described interception position, carries out cut position to data bit soft information, obtains output data. A kind of bit soft information cut position processing method is also disclosed simultaneously. The present invention is applicable in the multiple demodulating equipment of pilot signal, can reduce channel, spreading gain changes the impact on demodulation coding performance.
Description
Technical field
The invention belongs to digital information transmission technical field, relate to a kind of bit soft information cut position treating apparatusAnd method.
Background technology
In the communication technology, due to the increase of communication data storage media density and data transmission bauds,Channel condition worsens more, and more how mistake may occur. Therefore, wire/wireless communication should beIn communication channel, use error correction method or the error correcting code with high error-correcting performance.
In general, make bit-level data b be mapped to complex symbol S=l+j*Q at transmitting terminal by modulation,Wherein b can comprise m data, for example a0，a1，...，am, the size of complex symbol S can be M,And M=2m. Concrete mapping mode have a variety of, different modulation systems determined SER withAnd bit error rate. Accordingly, at receiving terminal, demodulator, according to the complex symbol S receiving, obtains numberAccording to the bit decision of b. Symbol level signal (comprises various transmission sides by transmission and the channel of communication systemFormula and various channel), received at receiving terminal, through channel equalization or interference-cancelled signals detection etc.,Always the equivalent transmission channel of signal can be expressed as: R=H*S+N. Wherein, H is the characteristic of channel, NRepresent additivity interference and noise.
As a rule, have two kinds of different approach to obtain judgement, one is according between H*S and RLeast square Euclidean distance carry out hard decision obtain estimated value, this judgement conventionally needs in the time that reality is carried outSet up the quantized value of thresholding and thresholding. In addition, in cascade system, due to follow-up Error ControlThe decoder of coding needs the information of bit-level conventionally, therefore, conventionally can adopt in another way, both softJudgement demodulation, for example, calculate the log-likelihood ratio of each bit, or be called soft information.
After obtaining soft information, in theory, can be directly inputted into corresponding decoder, to obtainDecode results. But in reality realizes, there is different decay to signal in different channels, andDecoder is processed has certain bit wide and amplitude requirement to input data, if the decoding of soft information is required effectivelyBit part cannot drop within the scope of the desired bit wide of decoder, and decoding performance can reduce greatly.
Summary of the invention
The technical problem that the present invention solves is: a kind of bit soft information treating apparatus is provided, has been applicable toIn the multiple demodulating equipment of pilot signal, can reduce that channel, spreading gain change demodulation coding performanceImpact. Meanwhile, the present invention also provides a kind of bit soft information processing method.
For solving the problems of the technologies described above, technical solution of the present invention is as follows:
Described a kind of bit soft information cut position treating apparatus, comprising:
Data extractor, receives the bit soft information of demapping output, and described bit soft information is separatedFor the soft information of data and the soft information of pilot tone;
Bit position extractor, utilizes the soft information acquisition interception position of described pilot tone;
Cut position device, according to described interception position, carries out cut position to data bit soft information, obtains output numberAccording to.
Further, described bit position extractor utilizes the sum-average arithmetic of the soft information of pilot bits to obtain referenceThe bit bit wide of amplitude; Obtain cutting according to the bit wide of described reference amplitude and predefined bit wide restrictive conditionFetch bit is put.
Described a kind of bit soft information cut position processing method, comprises the following steps:
Extract the soft information of pilot bits in each data segment;
According to the soft information acquisition interception position of described pilot bits;
According to described interception position to the soft information of the data bit in current data section intercept obtainBit data; Described Bit data is exported as data to decode.
Further, described interception position obtains by following steps:
The soft information of many described pilot bits is carried out sum-average arithmetic, determines the highest-order bit non-zero in described averagePut P;
According to predefined bit wide L=Lh+LlP is intercepted, obtain interception position (P+Lh)：(P-Ll+1)。
The present invention compared with prior art tool has the following advantages:
Be compared to prior art, the present invention separates the bit soft information of input, utilizes leading of receivingThe interception position of the special soft acquisition of information of frequency ratio to data bit soft information is soft to data bit according to interception positionInformation is carried out cut position before decoding. The cut position processing that adopts this kind of technical scheme to carry out data bit soft informationDo not rely on channel estimating, realize simple; And this technical scheme can be cut data bit soft information in timeFetch bit is put and is adjusted, and quick variation that can adaptive channel characteristic reduces channel variation to demodulation codingImpact, improves decoding efficiency; Therefore there is applicability widely. .
Brief description of the drawings
Fig. 1 is flow chart of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is data extractor structural representation;
Fig. 4 is bit position extractor structural representation;
Fig. 5 is cut position device structural representation;
Fig. 6 is embodiment schematic diagram.
Detailed description of the invention
A lot of details are set forth in the following description so that fully understand the present invention. But the present inventionCan implement to be much different from alternate manner described here, those skilled in the art can without prejudice toIn the situation of intension of the present invention, do similar popularization, therefore the present invention is not subject to the restriction of following public concrete enforcement.
As Fig. 1, the step of bit soft information processing method of the present invention is as follows:
Step S1, carries out the soft information of pilot bits and the soft letter of data bit by the bit soft information of demodulator outputBreath separates;
Step S2, carries out sum-average arithmetic to the soft information of the pilot tone of the N in data segment and obtains reference amplitude, andDetermine the interception position to data bit soft information according to described reference amplitude, enter step S3;
Step S3, the interception position obtaining according to step S2 intercepts rear output to data bit soft information.
As Fig. 2, a kind of embodiment of bit soft information cut position treating apparatus of the present invention comprises:
Data extractor, receives the bit soft information of demapping output, and leads to the soft information of data bit whereinSeparate with the soft information of pilot bits;
Bit position extractor, carries out sum-average arithmetic to the soft information of multiple pilot bits and obtains reference amplitude(" unit 1 ") occupied bit bit wide, and according to default bit wide restrictive condition, obtain the intercepting needingPosition;
Cut position device: according to the interception position of bit position extractor, data bit soft information is carried out to cut position,Obtain qualified data.
As Fig. 3, described data extractor can comprise:
Data buffer storage, receives the bit soft information of being exported by demodulator, the row cache of going forward side by side output;
Counter, counts the soft information of input bit, judges the arrival moment of pilot tone and data, controlsData exchange unit is exported;
Data exchange, according to the instruction of counter, input is divided into the soft information of data bit and pilot bits softInformation is exported respectively.
As Fig. 4, described bit position extractor can comprise:
Input block, receives the soft information of pilot bits of being exported by data extractor, carries out interception position informationOutput.
Sum unit, the soft information of pilot bits receiving according to input block is sued for peace.
Be averaging unit, to averaging with value. Obtain non-zero the highest-order bit in average and put P.
Cut position position generation unit is further put P according to the highest-order bit, calculates interception position: (P+Lh)：(P-Ll+ 1); Intercepted length L=Lh+LlFor default bit wide restrictive condition.
Wherein, input block can comprise buffer unit, enters for the soft information of multiple pilot bits to inputtedRow cache.
Sum unit can comprise preseting length setup unit, and preseting length is set. Described preseting lengthCan be the number length of pilot tone in a frame or the product with integer multiplying power. Described preseting length also can be and makeslog2 MFor the value M of integer.
As Fig. 5, described cut position device can comprise:
Input block, receives the soft information of data bit exported by data extractor, carries out data after cut positionOutput;
Shift unit, is shifted to the data of input;
Cut position unit, carries out cut position output according to interception position to the soft information of the data bit being shifted.
As shown in Figure 6, in a kind of embodiment of bit soft value treating apparatus of the present invention, demapping outputBit soft information inputs to data extractor, isolates the soft information of data bit and the soft information of pilot bits;
The soft information of data bit (12 bit bit wide):
000100000010
000000001010
000010111001
111001011001
000000010001
111111100100
000001011111
111001101011
The soft information of pilot bits (12 bit bit wide):
000001010000
111110111011
000111001000
000100101101
000100010101
000100001001
000110010010
000101001110
000001100110
111110110000
Then, the soft input information of pilot bits, to position extractor, obtains the highest non-zero position by cumulative meanPut P, obtain interception position, to the soft information calculating of above-mentioned pilot tone cumulative mean value be:
000011001110
Can obtain the highest non-zero bit position P=7,
Then, instruction cut position device carries out cut position processing to data bit soft information, and result enters decoder:
The design load of supposing rear end decoder is Lh＝2、Ll=4, the cut position result that can obtain data is:
010000
000000
001011
100101
000001
111110
000101
100110
Decoder both can soft information carry out decoding by the data bit after above-mentioned cut position.
Although the present invention illustrates as above by preferred embodiment, these preferred embodiments are not in order to limitThe present invention or those skilled in the art, without departing from the spirit and scope of the present invention, should have the ability to thisPreferred embodiment is made various corrections and is supplemented, and therefore, protection scope of the present invention is with the model of claimsEnclose and be as the criterion.
Claims (2)
1. a bit soft information cut position treating apparatus, is characterized in that comprising:
Data extractor, receives the bit soft information of demapping output, and described bit soft information is separatedFor the soft information of data and the soft information of pilot tone; Described bit soft information is that the data that receive are calculated through demappingInformation after method resume module, it is 1 of unit that the soft information of pilot bits of separation is used for obtaining reference amplitudeThe bit bit wide occupying, data extractor comprises data buffer storage, receives the soft letter of bit of being exported by demodulatorBreath, the row cache of going forward side by side output; Data extractor comprises counter, the soft information of input bit counted,Judge the arrival moment of pilot tone and data, control data exchange unit and export; Data extractor comprisesData exchange, according to the instruction of counter, is divided into the soft information of data bit and the soft letter of pilot bits by inputBreath is output respectively;
Bit position extractor, utilizes the soft information acquisition interception position of described pilot tone; Bit position extractorComprise input block, receive the soft information of pilot bits of being exported by data extractor, carry out interception position letterThe output of breath; Bit position extractor comprises sum unit, the pilot bits receiving according to input blockSoft information is sued for peace; Bit position extractor comprises and is averaging unit, to averaging with value; ObtainThe highest-order bit non-zero in average is put P; Bit position extractor comprises cut position position generation unit, rootPut P according to the highest-order bit, calculate interception position: (P+Lh)：(P-L1+ 1); Input block comprises buffer memoryUnit, carries out buffer memory for the soft information of multiple pilot bits to inputted; Sum unit can comprise settingLength setting unit, sets preseting length; Described preseting length is that the number of pilot tone in a frame is longDegree or with the product of integer multiplying power; Described preseting length also can be and makes log2 MFor the value M of integer;
Cut position device, according to described interception position, carries out cut position to data bit soft information, obtains output numberAccording to; Cut position device comprises input block, receives the soft information of data bit of being exported by data extractor, carries outThe output of data after cut position; Cut position device comprises shift unit, and the data of input are shifted; Cut position deviceComprise cut position unit, according to interception position, the soft information of the data bit being shifted is carried out to cut position output;
Described bit position extractor utilizes the sum-average arithmetic of the soft information of pilot bits to obtain the bit of reference amplitudeBit wide; Obtain interception position according to the bit wide of described reference amplitude and predefined bit wide restrictive condition.
2. a bit soft information cut position processing method, is characterized in that comprising the following steps:
Extract the soft information of pilot bits in each data segment; Data segment is the bit that receives demapping outputSoft information data section, described bit soft information is that the data that receive are after demapping algoritic module is processedInformation, the soft information of pilot bits of separation is for to obtain reference amplitude be the occupied bit of unit 1Wide;
According to the soft information acquisition interception position of described pilot bits; By the soft information of pilot bits to receptionSue for peace, to averaging with value, obtain non-zero the highest-order bit in average and put P, according to the highestBit position P, calculates interception position: (P+Lh)：(P-L1+1)；
According to described interception position to the soft information of the data bit in current data section intercept obtainBit data; Described Bit data is exported as data to decode;
Described interception position obtains by following steps:
The soft information of described pilot bits is carried out sum-average arithmetic, determines that the highest-order bit non-zero in described average putsP：
According to predefined bit wide L=Lh+L1P is intercepted, obtain interception position (P+Lh)：(P-L1+1)。
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| CN104168089B (en) * | 2014-08-27 | 2017-05-10 | 杭州国芯科技股份有限公司 | Method for dynamically adjusting data precision in de-interleaving process |
| CN107124203B (en) * | 2017-04-17 | 2019-06-25 | 四川九洲电器集团有限责任公司 | A kind of information processing method and electronic equipment |
| CN114079601B (en) * | 2020-08-19 | 2023-10-20 | 海能达通信股份有限公司 | Data processing method and related device |
| CN115037313B (en) * | 2022-08-12 | 2023-01-24 | 北京智芯微电子科技有限公司 | LDPC decoding quantization method, device and equipment, and LDPC decoding method and system |
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| CN101222471A (en) * | 2008-02-04 | 2008-07-16 | 北京北方烽火科技有限公司 | Base band link scaling method suitable for IEEE802.16e base station receiver |
| CN101237245A (en) * | 2007-01-31 | 2008-08-06 | 展讯通信（上海）有限公司 | Single-frequency broadcasting receiving method based on TD-SCDMA network |
| CN102025477A (en) * | 2009-09-10 | 2011-04-20 | 卓胜微电子（上海）有限公司 | Bit width adjusting method and system for soft demodulation and channel decoding cascade structure |
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| CN101237245A (en) * | 2007-01-31 | 2008-08-06 | 展讯通信（上海）有限公司 | Single-frequency broadcasting receiving method based on TD-SCDMA network |
| CN101222471A (en) * | 2008-02-04 | 2008-07-16 | 北京北方烽火科技有限公司 | Base band link scaling method suitable for IEEE802.16e base station receiver |
| CN102025477A (en) * | 2009-09-10 | 2011-04-20 | 卓胜微电子（上海）有限公司 | Bit width adjusting method and system for soft demodulation and channel decoding cascade structure |
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