soft_decision.m

放大转发协同通信的有关仿真代码

x1 = round(rand(1, 112));           % info. bits 信息比特
CRC_CCITT = CRC_16(x1);
x =[x1,CRC_CCITT]
%msg = randint(200,1,2,139); % Random data
t = poly2trellis(3,[7 5],7); % Define trellis.
code = convenc(x,t)% Encode the data.
ncode = awgn(code,3,'measured'); % Add noise.

% Quantize to prepare for soft-decision decoding.
qcode = quantiz(ncode,[0.001,.1,.3,.5,.7,.9,.999]);

tblen = 48; delay = tblen; % Traceback length
decoded = vitdec(qcode,t,tblen,'cont','soft',3) % Decode.


% Compute bit error rate.
[number,ratio] = biterr(decoded(delay+1:end),x(1:end-delay))