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BPSK Simulator for Low Rate Transmisions

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BPSK Simulator for Low Rate Transmisions

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01 Jun 2004 (Updated )

BPSK Simulator for didactical purposes. Systemic coding style.

IQsignals(x,L, pulso)
function [I,Q] = IQsignals(x,L, pulso)
%------------------------------------------------------------------------
%|  function IQsignals(x, L, SNR, pulso)
%------------------------------------------------------------------------
%|
%|    Create IQ signals for QPSK modulation
%| 
%|    Parametros de Entrada:
%|       1.- X = bit secuence as row vector. 
%|                Restrictions: length(X) even => length(X) = 2*k
%|       2.- L = samples per bit
%|       3.- PULSO = flag, 0= square signal, 
%|                         1= raise cosine signal (Roll Off= 0.6) 
%|
%|   Salidas:
%|       1.- I = in Phase
%|       2.- Q = in Quadrature
%|
%|     NOTA: Communication and Signal Toolboxes required 
%|
%-------------------------------------------------------------------------
%|   Autor: Cesar Delgado
%|   Fecha: 19-Abril-2.004
%-------------------------------------------------------------------------

% 1.- Converting to "1", "-1" secuence
%--------------------------------------
x = 2*x-ones(1,length(x));

% 2.- Squere signals generation
%-------------------------------
I = SquareGen(x(1:2:length(x)),L);
Q = SquareGen(x(2:2:length(x)),L);

% 2.- Raise cosine filtering
%---------------------------
if ~pulso,    
    h = rcosfir(0.6,[-3 3],L,1); 
    I  = filter (h,1,I);         
    Q  = filter (h,1,Q);
end;

I =  I./max(I);
Q =  Q./max(Q);

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