CN104601290A - CSI (channel state information) supplementary decision decoding method suitable for hardware implementation - Google Patents
CSI (channel state information) supplementary decision decoding method suitable for hardware implementation Download PDFInfo
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- CN104601290A CN104601290A CN201510068207.7A CN201510068207A CN104601290A CN 104601290 A CN104601290 A CN 104601290A CN 201510068207 A CN201510068207 A CN 201510068207A CN 104601290 A CN104601290 A CN 104601290A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000010606 normalization Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 238000000205 computational method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0606—Space-frequency coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention relates to a CSI (channel state information) supplementary decision decoding method suitable for hardware implementation. LLR value obtained by demapping through CSI reflecting channel reliability can be corrected, so that the newly obtained LLR value carries channel information of a current subcarrier, expense of hardware is considered and average value of CFR amplitude within a same code block is used as a normalization factor. Decoding accuracy of soft-decision decoder is improved, hardware expense is saved and hardware implementation is facilitated.
Description
Technical field
The present invention relates to OFDM in the communication technology (OFDM) technical field, refer in particular to a kind of for utilizing CSI (Channel State Information in orthogonal FDM communication system, channel condition information) assisting soft decision decoding, improves the method for channel decoder reliability of decode.
Background technology
Orthogonal frequency division multiplexi belongs to multi-carrier modulation, high-speed data is flowed through serioparallel exchange, data symbol persistence length on each subcarrier is increased relatively, thus the intersymbol interference that the temporal dispersion that reduction radio channel multi-path delay spread produces effectively brings, reduce complexity balanced in receiver.Simultaneously the channel of assignment is divided into many mutually orthogonal and subchannels of overlap by it, and compared with the Frequency Division Multiplexing system of routine, ofdm system can maximally utilise frequency spectrum resource.Carry out narrowband modulation and transmission on each of the sub-channels, signal bandwidth is less than the correlation bandwidth of channel, and the frequency selective fading of channel is converted into flat fading.
Just because of above-mentioned advantage, OFDM is widely used in digital audio broadcasting (DAB), digital video broadcasting (DVB) and various modern communications agreement by people as the efficient digital transmission mode of one.
Adopt the CFR amplitude average of same data transmission block as normalization factor in prior art, need when realizing to store the channel magnitude corresponding to a large amount of carrier wave, during hardware implementing, need comparatively large memories part.Therefore, be badly in need of proposing a kind of method of reseptance utilizing CSI assisting soft decision decoding device, to improve the decoding accuracy of Soft decision decoding, the method needs to consider that minimizing takies hardware resource and hard-wired feasibility simultaneously.
Adopt the CFR amplitude average of same data transmission block as normalization factor in prior art, need when realizing to store the channel magnitude corresponding to a large amount of carrier wave, comparatively large memories part is needed during hardware implementing, the present invention utilizes CSI assisting soft decision decoding device, consider the realizability of hardware simultaneously and save hardware resource, utilize CFR amplitude average in same encoding block as normalization factor, not only increase the decoding correctness of soft decision decoder, also save hardware spending simultaneously, be convenient to hardware implementing.Such as, may have at most 240 encoding blocks in Wimax system in a data transmission block, minimum may have 1 encoding block.Utilize CFR amplitude average in same encoding block as normalization factor, unit due to each decoding of soft decision decoder is an encoding block, compared to adopting the CFR amplitude average of same data block as normalization factor, more can represent the degree of reliability of carrier transmission, improve the decoding correctness of soft decision decoder.
Further aspect of the present invention, by the description of following embodiment, is clearly recorded.
Summary of the invention
The invention provides a kind of computational methods simple and be convenient to the hard-wired method utilizing channel condition information assisting soft decision decoding.Concrete technical scheme is as follows:
A kind of applicable hard-wired CSI auxiliary judgement interpretation method, it comprises the steps:
A. utilize channel estimating or the blind Channel Estimation of pilot signal, obtain the estimated value of CFR:
;
B. the amplitude of the CFR estimated value of corresponding each subcarrier k is calculated
, k=0,1..., N-1, get the CFR amplitude that subcarrier in same encoding block is corresponding
, the average of k=0,1..., N-1 is as normalization factor α, and the amplitude of the CFR estimated value of each subcarrier k obtains CSI divided by the normalization factor α of place encoding block;
C. subcarrier is multiplied by the CSI of its correspondence by the log-likelihood ratio that demapping obtains, and obtains the log-likelihood ratio with channel reliability information;
D. the log-likelihood ratio with channel reliability information is sent to soft decision decoder, so obtain transmitting terminal send information bit.
Advantage of the present invention:
Accompanying drawing explanation
Fig. 1 is the structured flowchart that the present invention utilizes the receiving system of CSI assisting soft decision decoding;
Fig. 2 is the planisphere that 16-QAM is corresponding.
Embodiment
As shown in Figure 1, this receiving system comprises channel estimator, its utilize pilot signal or training signal to carry out CFR estimated value channel estimator that channel estimating obtains all subcarriers on whole running time-frequency resource can adopt LS to estimate, MMSE also can be adopted to estimate.
The amplitude of the CFR estimated value that channel status weighted factor computing unit calculates on each subcarrier gets the average of same encoding block CFR amplitude as normalization factor α, such as formula (1):
In formula, N represents the variable number that corresponding transmitting terminal encoder code block comprises.
CSI value obtains such as formula (2):
Output signal is after channel equalizer, and obtain the signal through channel compensation, formula is as follows:
Wherein k=0,1 ..., N-1.
Be sent in demodulator by the signal zk obtained after channel compensation, the present invention explains for 16-QAM.Fig. 2 is the planisphere that 16-QAM is corresponding, and at ofdm system transmitting terminal, the binary number of input modulator according to this four bit b3b2b1b0 is one group, is converted to the point on the planisphere of 16-QAM shown in Fig. 2, is expressed as plural form (I+jQ).The in-phase component I of b3b2 determining modulation signal, the quadrature component of b1b0 determining modulation signal.Demodulator carries out soft-decision to b3b2b1b0, can not lose some for the useful information of decoder.Utilize formula (4) that the LLR of corresponding four bits of each subcarrier can be obtained.
The LLR signal of the CSI value utilizing subcarrier corresponding to the subcarrier that formula (4) obtains is weighted operation, such as formula (5):
In formula, suppose the noise power approximately equal of each subcarrier, CSI estimated value is the CFR amplitude of subcarrier k, can characterize the signal to noise ratio snr of subcarrier k position.
The LLR information of CSI weighting is sent in soft decision decoder, the bit information that transmitting terminal will transmit can be obtained.
The present invention utilizes the CSI of reflection channel reliability to revise the LLR value obtained after demapping, make to carry channel information residing for current sub-carrier in the LLR value newly obtained, consider hardware implementing expense simultaneously, utilize the average of the CFR amplitude in same encoding block as normalization factor.
The above, only to the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Every in claim limited range of the present invention, any amendment made, equivalent replacement, improvement etc., all should within protection scope of the present invention.
Claims (1)
1. be applicable to a hard-wired CSI auxiliary judgement interpretation method, it is characterized in that: it comprises the steps:
A. utilize channel estimating or the blind Channel Estimation of pilot signal, obtain the estimated value of CFR:
;
B. the amplitude of the CFR estimated value of corresponding each subcarrier k is calculated
, k=0,1..., N-1, get the CFR amplitude that subcarrier in same encoding block is corresponding
, the average of k=0,1..., N-1 is as normalization factor α, and the amplitude of the CFR estimated value of each subcarrier k obtains CSI divided by the normalization factor α of place encoding block;
C. subcarrier is multiplied by the CSI of its correspondence by the log-likelihood ratio that demapping obtains, and obtains the log-likelihood ratio with channel reliability information;
D. the log-likelihood ratio with channel reliability information is sent to soft decision decoder, and then obtains the information bit of transmitting terminal transmission.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688582A (en) * | 2018-11-21 | 2019-04-26 | 河南科技大学 | Without the method based on BI-AWGN channel build WTC-I under channel state information |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013955A (en) * | 2010-11-24 | 2011-04-13 | 信源通科技（西安）有限公司 | Method suitable for hardware realization for assisting soft decision decoding by using channel state information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013955A (en) * | 2010-11-24 | 2011-04-13 | 信源通科技（西安）有限公司 | Method suitable for hardware realization for assisting soft decision decoding by using channel state information |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688582A (en) * | 2018-11-21 | 2019-04-26 | 河南科技大学 | Without the method based on BI-AWGN channel build WTC-I under channel state information |
| CN109688582B (en) * | 2018-11-21 | 2021-11-19 | 河南科技大学 | Method for building WTC-I based on BI-AWGN channel without channel state information |
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Application publication date: 20150506 |