qpskmod.m

对Vblast—oFdm系统地仿真

function mod_symbols=QPSKMod(bits_in);

full_len = length(bits_in);
if rem(full_len,2)~=0
    error('Unimplemented modulation');
end

  
table=exp(j*[-3/4*pi 3/4*pi 1/4*pi -1/4*pi]);  % generates QPSK symbols
table=table([0 1 3 2]+1); % Gray code mapping pattern for QPSK symbols
inp=reshape(bits_in,2,full_len/2);
mod_symbols=table([2 1]*inp+1);