Communications Toolbox

Demodulating the Signal

This part of the example demodulates the noisy modulated signal, noisy, in two different ways. The ddemodce function performs both demodulations by operating on each column of noisy separately. In each case, ddemodce puts the results into the two-column matrix newsignal.

• % Demodulate to recover the message.
  newsignal(:,1) = ddemodce(noisy(:,1),Fd,Fs,'qask',M);
  newsignal(:,2) = ddemodce(noisy(:,2),Fd,Fs,...
  'qask/arb',inphase,quadr);
  

Adding Noise

Computing and Displaying Bit Error Rates