5G NR信号里的matlab生成，SSB块

classdef (StrictDefaults)h5gPolarDecoder < matlab.System & matlab.system.mixin.Propagates & ... matlab.system.mixin.CustomIcon %h5gPolarDecoder Decode input using a polar decoder % POLARDEC = h5gPolarDecoder creates a polar decoder System object, % POLARDEC to decode a polar-code encoded bit stream. This object % uses the CRC-Aided Successive-Cancellation List (CA-SCL) decoding % algorithm. % % POLARDEC = h5gPolarDecoder(Name,Value) creates a polar % decoder object, POLARDEC, with the specified property Name set to % the specified Value. You can specify additional name-value pair % arguments in any order as (Name1,Value1, ... ,NameN,ValueN). % % POLARDEC = h5gPolarDecoder(CODEWORDLENGTH,MESSAGELENGTH, ... % FROZENBITS,LISTLENGTH,CRCLENGTH) creates a polar decoder object, % POLARDEC, with the CodewordLength property set to CODEWORDLENGTH, % MessageLength property set to MESSAGELENGTH, FrozenBits property % set to FROZENBITS, the ListLength property set to LISTLENGTH, and % the CRCLength property set to CRCLENGTH. % % Step method syntax: % % Y = step(POLARDEC,INPLLR) decodes the received bits, input as % log-likelihood ratios, INPLLR, using the CA-SCL decoding algorithm. % The input is: % INPLLR: a N-by-1 double column containing log-likelihood ratios % for each of the received bits. % The output is: % Y: a double column vector containing the decoded bits. The size % of the output is K, where K represents the number of % information bits encoded. % % System objects may be called directly like a function instead of % using the step method. For example, y = step(obj,x) and y = obj(x) % are equivalent. % % h5gPolarDecoder methods: % % step - Perform polar decoding (see above) % release - Allow property value and input characteristics changes % clone - Create polar decoder object with same property values % isLocked - Locked status (logical) % % h5gPolarDecoder properties: % % CodewordLength - Code word length (N) % MessageLength - Message length (K) % FrozenBits - Frozen bit vector of length N (F) % ListLength - List decoding length (L) % CRCLength - Number of CRC bits % DeinterleaveOutput - Deinterleave output % % % Example: Transmit polar-encoded block of data and decode using % % a CRC-Aided Successive Cancellation List decoder. % % K = 132; % Message length % E = 256; % Encoded length % nMax = 9; % Maximum value of n, Nmax = 2^n % F = h5gPolarConstruct(K,E,nMax); % {0 info, 1 frozen} % N = length(F); % Mother code length % crcLen = 24; % Number of CRC bits % nVar = 1.5; % Noise variance % L = 8; % List length % % % Object constructions % polarEnc = h5gPolarEncoder(N,K,F,'InterleaveInput',true); % bpskMod = comm.BPSKModulator; % chan = comm.AWGNChannel('NoiseMethod','Variance','Variance',nVar); % bpskDemod = comm.BPSKDemodulator('DecisionMethod', ... % 'Approximate log-likelihood ratio', 'Variance',nVar); % polarDec = h5gPolarDecoder(N,K,F,L,crcLen,'DeinterleaveOutput',true); % % % Simulate a frame % msg = randi([0 1],K-crcLen,1); % Generate a random message % msgcrc = h5gCRCEncode(msg,'24C'); % CRC encode % enc = polarEnc(msgcrc); % Polar encode % mod = bpskMod(enc); % Modulate % rSig = chan(mod); % Add WGN % rxLLR = bpskDemod(rSig); % Soft demodulate % rxBits = polarDec(rxLLR); % Polar decode % % % Get bit errors % numBitErrs = biterr(rxBits(1:K-crcLen), msg); % disp(['Number of bit errors: ' num2str(numBitErrs)]); % % See also h5gPolarEncoder, h5gPolarConstruct. % Copyright 2017-2018 The MathWorks, Inc. %#codegen % References: % [1] Tal, I, and Vardy, A., "List decoding of Polar Codes", IEEE % Transactions on Information Theory, vol. 61, No. 5, pp. 2213-2226, % May 2015. % [2] Stimming, A. B., Parizi, M. B., and Burg, A., "LLR-Based % Successive Cancellation List Decoding of Polar Codes", IEEE % Transaction on Signal Processing, vol. 63, No. 19, pp.5165-5179, % 2015. properties (Nontunable) %CodewordLength Code word length % Specify the code word length as a positive integer scalar which % also must be a power of 2. The default is 512. CodewordLength = 512; %MessageLength Message length % Specify the message length as a positive integer scalar. The % default is 256. MessageLength = 256; end properties (Nontunable) %FrozenBits Frozen bit vector % Specify the frozen bit vector as a binary vector of length % CodewordLength, where a 1-value specifies a frozen bit index % and a 0-value specifies the information bit index. The number % of 0's in the vector must be equal to MessageLength. The % default is [ones(256,1);zeros(256,1)]. % % See also h5gPolarConstruct. FrozenBits = [ones(256,1);zeros(256,1)]; end properties (Nontunable) %ListLength List decoding length % Specify the list decoding length as a positive integer scalar. % The default is 4. ListLength = 4; % List decoding length %CRCLength Number of CRC bits used for decoding % Specify the number of CRC bits used for decoding. A 0-value % implies no CRC-aided decoding. When enabled, the output decoded % bits include the CRC bits. Supported values include one of [0 6 % 11 24]. The default is 0. CRCLength = 0; % CRC length end properties (Nontunable, Logical) %DeinterleaveOutput Deinterleave output % Specify whether the decoded bits are deinterleaved prior to % output. The default is true, which corresponds to an iIL value % of 1. DeinterleaveOutput = true; end properties (Access=private) % Tal & Vardy data structures % CodewordLength: N, MessageLength: K, FrozenBits: F % ListLength: L m; % log2(N) br; % bit reversed vector (N-by-1) arrayPtrLLR; % (m+1)-by-L arrayPtrC; % (m+1)-by-L llrPathMetric; % L-by-1 pathIdxToArrayIdx; % (m+1)-by-L inactiveArrayIndices; % (m+1)-by-L inactiveArrayIndicesLen;% (m+1)-by-1, (m+1) stack depths arrayReferenceCount; % (m+1)-by-L inactivePathIndices; % L-by-1 inactivePathIndicesLen; % 1-by-1, stack depth activePath; % L-by-1 savedCWs; % N-by-L crcDet; % CRC-detector piInterl; % interleaver pattern end methods % Class constructor function obj = h5gPolarDecoder(varargin) setProperties(obj, nargin, varargin{:}, 'CodewordLength', ... 'MessageLength', 'FrozenBits', 'ListLength', 'CRCLength'); end % Set class parameters function set.CodewordLength(obj,value) validateattributes(value, {'numeric'}, ... {'real', 'finite', 'positive', 'integer', 'scalar'}, ... '', 'CodewordLength'); obj.CodewordLength = value; end function set.MessageLength(obj,value) validateattributes(value, {'numeric'}