remove_mean.m

这个程序主要是实现空时编码的matlab编解码仿真。

function [unbiased_signal]=remove_mean(received_signal)

%   [unbiased_signal]=remove_mean(received_signal)
%
%	
%	Output:
%   unbiased_signal     -   Received signal minus its mean.
%   
%   Input:
%   received_signal     -   Signal from analog-digital converter in frontend.
%
%   Short Theoretical Background for the Function:
%   
%   Creating an unbiased signal in the receiver simply
%   by removing the mean of incoming signal.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
%%% Function part of simulation for Space-Time
%%% coding project, group Grey-2001.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%   Author: Stefan Uppg錼d
%   Date: 30-03-2001
%   Version: 1.0
%   Revision (Name & Date & Comment):
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

K   = length(received_signal);
sum = sum(received_signal);

mean_rec = sum/K;

unbiased_signal = received_signal - mean_rec;

%%%
%%% Of course, the mean-function in Matlab could have been used.
%%% Assume my operations are equivalent in calculation-comsumtion.
%%%