rx_8bpsk_demod.m

对基本调制解调进行了详细的阐述,包括BPSK,QPSK,16QAM,64QAM

% 8PSK解调 (not right)
function demod_bits = rx_8bpsk_demod(sym)
%*************************8bpsk_demodulate *******************************        % 参见8PSK的星座图
demod_bits = zeros(3*size(sym,1), size(sym,2));  % Each symbol consists of 4 bits        
        bit0 = -imag( sym * exp(j*pi/8)) ;
        % bit1和bit2解调,都需要进行星座旋转
        bit1 = -real(sym * exp(j*pi/8)) ;
        
        bit2 = [];
        for k = 1:length(sym)
            tmp = sym(k) * exp(-j*pi/8); 
            if ((real(tmp) <0) & (imag(tmp) >0)) | ((real(tmp) >0) & (imag(tmp) <0))
                bit2 = [bit2 0];
            else
                bit2 = [bit2 1];
            end   
        end
        
        demod_bits(1,:) = bit0 ;
        demod_bits(2,:) = bit1 ;
        demod_bits(3,:) = bit2 ;    %　已经硬判决