mod_mask_020530b.m

2ask,4ask,2fsk,4fsk,2psk,4psk,16qam,gmsk,msk,pi/4qpsk,oqpsk.11种数字信号的生成。

function y = mod_mask_020530b (x,n,M)

global k Fc Fd Fs n Fs_n;

%modulate x with wc.
wc=cos(2*pi*n*Fc);      %generate the Carrier Waveform

%%%%%%%%%%%%%%%%
%% 2ASK Modulation
if M == 2
    y = (0.2 + 0.8 * x).*wc;
end

%%%%%%%%%%%%%%%%
%% 4ASK Modulation
if M == 4
    y = (0.25 + 0.25 * x).*wc;
end