decision.m

OFDM系统仿真

function dec_symbol = decision(est_symbol, dec_mod)

%%
%%  extract data from the QPSK modded symbol
%%  seriallized output
%%

[N,M] = size(est_symbol);
real_sym = zeros(N,M);
imag_sym = zeros(N,M);
real_sym = real(est_symbol);
imag_sym = imag(est_symbol);
dec_symbol=zeros(N,2*M);
for i=1:N
   if( dec_mod == 1)   % hard decision
      serial_data = zeros(2,M);
      serial_data(1,:) = sign(real_sym(i,:));
      serial_data(2,:) = sign(imag_sym(i,:));
   else
      serial_data = zeros(2,M);
      serial_data(1,:) = real_sym(i,:);
      serial_data(2,:) = imag_sym(i,:);
   end

   dec_symbol(i,:) = reshape(serial_data, 1, []);
end