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 ~=...
上面讲解了计算BPSK调制的BER和SNR的计算方法,但是可以看到,我们译码如果出现错误是无法纠错的,所以需要一种纠错码(堪称ECC——Error-Correction Coding,通过加冗余的方式来进行纠错,降低误码率),因此我们需要采用一种纠错码先编码,再调制,来达到纠错的目的。 下面会进行两组matlab仿真(不进行编码直接调制和采用(3,1)...
The decoding algorithm is the key to LDPC code and the complexity of decoding direct impactrealizationof 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 studying ...
Propagation (BP) Log, Belief Propagation (BP) Probabilistic (PROB), Belief Propagation (BP) Log Simple is example of the Soft decision decoding techniques.Keywords:-"Low Density Parity Check Code", "Quasi-Cyclic Low Density Parity Check code", "Bit Error Rate", "SNR", "Decoding techniques"...
[Y,actualnumiter,finalparitychecks] = ldpcDecode(llr,decodercfg,maxnumiter,Name=Value) specifies additional name-value arguments. For example, DecisionType='soft' specifies soft-decision decoding and outputs LLRs.Examples collapse all Decode Rate 3/4 LDPC Codewords Try This ExampleCopy Code Copy...
soft values at the time of decoding, which in turn makes soft-decision ECCs such as LDPC codes a suitable candidate for implementation in flash memories... Y Yeh,A Fazeli,PH Siegel - IEEE International Conference on Communications 被引量: 0发表: 2021年 TRANSMISSION DEVICE, TRANSMISSION METHOD,...
Processes one LDPC codeword in one unit of time in Simulink® Approximates the log-likelihood ratio of the channel output for LDPC decoding by considering only two points in the constellation nearest to the received signal during soft-decision demodulation ...
not LLRs. My question is (and I could not find this in the doc): Is the algorithm used to decode the LDPC code still the same as in soft decision (i.e., does the decoding iteration still work with LLRs) or is it indeed a hard decision algorithm (i.e. the bit flipping algorithm...
A Decoding Algorithm for LDPC Codes of High order Modulation Chen Yan,Cai Can Hui (College of Engineering and Science, Hua Qiao University, Quanzhou 362021, China) Abstract: Based on low-density parity-check (LDPC) coded modulation system, a new soft decision metric, with and without noise ...
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