qam64mod.m

对Vblast—oFdm系统地仿真

function mod_symbols=QAM64Mod(bits_in)  

full_len = length(bits_in);
if rem(full_len,6)~=0
    error('Unimplemented modulation');
end

% generates 64QAM symbols
m=1;
for k=-7:2:7
    for l=-7:2:7
        table(m) = (k+j*l)/sqrt(42); % power normalization
        m=m+1;
    end;
end;
table=table([[ 0  1  3  2  7  6  4  5]...
      8+[ 0  1  3  2  7  6  4  5]... 
      24+[ 0  1  3  2  7  6  4  5]...
      16+[ 0  1  3  2  7  6  4  5]...
      56+[ 0  1  3  2  7  6  4  5]...
      48+[ 0  1  3  2  7  6  4  5]...
      32+[ 0  1  3  2  7  6  4  5]...
      40+[ 0  1  3  2  7  6  4  5]]+1);
   
inp=reshape(bits_in,6,full_len/6);
   
mod_symbols=table([32 16 8 4 2 1]*inp+1);