bpsk.m

这个程序主要是实现空时编码的matlab编解码仿真。

function [symbols]=bpsk(data_block,model)

%   [symbols]=bpsk(data_block,model)
%
%	Output:
%	symbols		- Symbols mapped in signal-space (symbol-vector)
%   
%   Input:
%   data_block  - Vector of data to mapped into BPSK symbols (binary vector)
%	model		- If model = 0, no Alamouti (int 0,1)
%						if model = 1, Alamouti coding and sent energy
%						is set to half.
%
%   Short Theoretical Background for the Function:
%
%   Map the bits in data_burst into complex-valued BPSK symbols.
%   The energy of each BPSK-symbol is unity.
%   
%   Complex part (Q channel)
%         ^
%         |
%         |   (bit = 1)
%         |
%  ---x---+---x--->  real part (I channel)
%(bit = 0)|
%         |  
%         |
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
%%% Function part of simulation for Space-Time
%%% coding project, group Grey-2001.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%   Author: Stefan Uppg錼d
%   Date: 2001-03-19
%   Version: 1.1
%   Revision (Name & Date):
%		SU 2001-03-25 Added model parameter.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

I = 2*data_block(1:end) - 1;
Q = 0;
symbols = I + j*Q;
if model == 1
   symbols = (1/sqrt(2)) * symbols;
end