detect_symb.m

来自「mimo2x2天线选择系统的全系统matlab程序,先前的是dsp程序.」· M 代码 · 共 42 行

function [ Iout, Qout ] = detect_symb(Ich, Qch)
% 16-QAM detector
%
% Input:
%   I-channel & Q-channel data
%
% Output:
%   bhat  = bits {0,1} corresponding to the QPSK symbols
% Gray mapping
% 0010 0110 1110 1010
% 0011 0111 1111 1011
% 0001 0101 1101 1001
% 0000 0100 1100 1000
M = 4; %  4 bits per symbol

len = length(Ich);
Iout = zeros(1,len);
Qout = zeros(1,len);

k = 1;
for i = 1:len
    
    if(Ich(i)>2)
        Iout(i) = 3;
    elseif (Ich(i)>0)
        Iout(i) = 1;
    elseif (Ich(i)>-2)
        Iout(i) = -1;
    else
        Iout(i) = -3;
    end
    if(Qch(i)>2)
        Qout(i) = 3;
    elseif (Qch(i)>0)
        Qout(i) = 1;
    elseif (Qch(i)>-2)
        Qout(i) = -1;
    else
        Qout(i) = -3;
    end        
        
end