carrier.m

这个程序主要是实现空时编码的matlab编解码仿真。

function [spb]=carrier(sbb,fc,fs,T)

%   [spb]=carrier(sbb,fc,fs,T)
%
%	Output:
%	spb		    - Passband signal
%	
%   Input:
%	sbb         - Baseband signal
%   fc          - Carrierfrequency
%   fs          - Samplingfrequency
%   T           - Symboltime
%
%   Short Theoretical Background for the Function:
%
%   Multiplys the baseband signal, sbb, with a sinusoidal function 
%   to get a passband signal centered around the carrier frequency, fc.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
%%% Function part of simulation for Space-Time
%%% coding project, group Grey-2001.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%   Author: Fredrik Hansson 
%   Date: 2001-03-19
%   Version: 1.0
%   Revision (Name & Date):
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

oversamp = fs*T;

t = 0:T/oversamp:(length(sbb)*T-T)/oversamp;  %time-scale

spb = sbb.*cos(2*pi*fc*t);