function [received,alpha,theta]=rayleigh(trans,variance)%   [received,alpha,theta]=rayleigh(trans,variance)%%	Output:%	received   - Received signal after rayleigh fading channel%   %   Input:%	trans      - Transmitted signal (baseband!)%   variance   - Variance for the rayleigh fading%   %   Short Theoretical Background for the Function:%%   puts trans through a rayleigh fading channel %   received = alpha*exp(j*theta). Constant alpha %   and theta during one block.%   In baseband!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     %%% Function part of simulation for Space-Time%%% coding project, group Grey-2001.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   Author: Fredrik Hansson%   Date: 2001-03-28%   Version: 1.0%   Revision (Name & Date & Comment):%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%sigma2 = variance;x = sqrt(sigma2)*randn(1); y = sqrt(sigma2)*randn(1);alpha = sqrt(x^2+y^2);    %rayleigh distributed%alpha = 0.8378;theta = 2*pi*rand(1);%theta = atan(y/x);received = alpha * exp(j*theta)*trans;