co_dec.m

OFDM系统仿真

function output = co_dec( input, mode )
%
% convolution code and viterbi soft decode according to 'mode'
%

trellis = poly2trellis( 7, [ 171 133 ] );  % trellis structure of (2 1 7) convolution code

if mode == 1
    output = convenc( input, trellis );
else
    output = vitdec( input, trellis, 7, 'trunc', 'hard' );
end