Decision Device:接收到的信号和+1近还是和-1近,进行判决。 BPSK Demapper:+1——0 -1——1 注:倒数第二列error。 3. BER(Bit - Error Rate,误码率) and SNR(Signal - to - Noise Ratio,信噪比) 误码率:我们传输1000个bit,有1个错误,误码率为1/1000。 信噪比=信号的能量/噪声的能量 用dB表示信...
r:接收到的信息。 Hard Decision:硬判决,转换为0 1 bit。 dmin:码距(两个码字不同位的个数,如101和010的码距为3)——和已知编码后的码字的最小距离,根据码距的大小进行译码,如(7,4)汉明码,下面是信息位置和编码后的码字表: 假设b = [1\ 0\ 1\ 0\ 1\ 0\ 1]我们在表中没有找到相同的,这时...
r = s + sigma * randn(1,n); %AWGN channel %Hard-decision decoding b = (r < 0); %threshold at zero if sum(b) > 1 msg_cap1 = 1; else msg_cap1 = 0; end %Soft-decision decoding if sum(r) < 0 msg_cap2 = 1; else msg_cap2 = 0; end Nerrs = Nerrs + sum(msg ~=...
r = s + sigma * randn(1,n); %AWGN channel I %Hard-decision decoding b = (r < 0); %threshold at zero dist = mod(repmat(b,16,1)+cwords,2)*ones(7,1); [mind1,pos] = min(dist); msg_cap1 = cwords(pos,1:4); %Soft-decision decoding corr = (1-2*cwords)*r'; [mind...
LDPC软判决软输入软输出A new soft-input, soft-output algorithm for decoding LDPC codes is described in this paper. Using soft squared Euclidean distance as the metric, the algorithm realizes decoding by iterating the antilog-sum of the Euclide an distance. A simplified algorithm is also put ...
Although they are predominantly used with BCH component codes and hard decision decoding, soft decision decoding has also been recently attempted, with BCH and polar code based staircase codes. We consider using LDPC codes as the component code of soft decoded staircase codes. Results demonstrate ...
viewofcodinganddecodingofLDPC.ThecodingalgorithmofLDPCanditsimplementationstructureareproposed.Thebeliefpropagation(BP)algorithmbasedonsoftdecisiondecodingisanalyzed,andasimplifieddecodingmethodwithre—ducedcomputationalcomplexityisalsogiven.Thesimulationresultsshowtheperformancecomparisonbetweendifferentdecodingalgo—rithmsin...
approachingdecodingperformance.Inthisthesis,wemainlydiscusstheiterativesoft—decisiondecodingofLDPCandGLDcodes.WedesigntwoefficientiterativedecodingalgorithmsnamedconditionedBP(beliefpropagation)andChase-MP(messagepassing)algorithms,andalsopresentseveralimprovedmethodsforanalyzingtheperformanceofBPdecoding,andfordesigningtheBP...
[13]Nai W, Zhang T, Wang S, et al.Performance analysis of soft decision applied demodulation process in dedicated short range communication based on IEEE 802.11p protocol[J]. International Conference on Systems and Informatics,2017: 939-943. ...
The decoding algorithm is the key to LDPC code and the complexity of decoding direct impact realization of the system. There are three kinds of decoding algorithms: hard-decision method, soft-decision methods and hybrid decoding. The hard-decision method was used in this design. Based on ...