alamouti_encoder.m

alamouti結合ofdm系統下 做的仿真系統。 提供大家討論使用 不懂的再與我聯絡吧

function [Ich_left, Qch_left, Ich_right, Qch_right] = alamouti_encoder(Ich, Qch)
%% function [Ich_left, Qch_left, Ich_right, Qch_right] = alamouti_encoder(Ich, Qch)
% Alamouti encoder
% Input:  I & Q from bit mapper
% Output: I, Q for 2 transmitting antennas
len = length(Ich);

Ich_left = zeros(1, len);
Qch_left = zeros(1, len); 
Ich_right = zeros(1, len);
Qch_right = zeros(1, len);

for k = 1:2:len-1
    Ich_left(k) = Ich(k); % s0
    Qch_left(k) = Qch(k);    

    Ich_right(k) = Ich(k+1); % s1
    Qch_right(k) = Qch(k+1);        
    
    Ich_left(k+1) = -Ich(k+1); % -s1*
    Qch_left(k+1) = +Qch(k+1);    
    
    Ich_right(k+1) = Ich(k); % s0*
    Qch_right(k+1) = -Qch(k);               
end