mtx_encode_bit.m

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%  Property of Freescale
%  Freescale Confidential Proprietary
%  Freescale Copyright (C) 2005 All rights reserved
%  ----------------------------------------------------------------------------
%  $RCSfile: mTx_encode_bit.m.rca $
%  $Revision: 1.1 $
%  $Date: Mon Jan 22 10:28:18 2007 $
%  Target: Matlab
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%
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% [output, state] = mTx_encode_bit(g, input, inputB, state) encodes
% one pair of data and outputs two parity bits Y, W
%
% Outputs:
% output => Encoded data bits. First two bits are set to 0 for the
% systematic bits
% state => New state vector.
%
% Inputs:
% g => Generator polynomial.
% input => Encoded inputA.
% inputB => B value in each pair.
% state => Current state vector.


function [output, state] = mTx_encode_bit(g, input, inputB, state)

% k is the constraint length
% m is the amount of memory
[n,k] = size(g);
m = k-1;

% % Set the first two bits to zero.
parity_bit = rem(g*[input,state(1:m)]',2)';

output = [0,0,parity_bit(2:n)];

% New state vector
state = xor(state,inputB);
state = [input, state(1:m-1)];