gusucode.com > UWB_matlab源码程序 > CP0203/cp0203_qpsk_mod.m
% % FUNCTION 2.10 : "cp0203_qpsk_mod" % % This function receives a binary stream in input ('bits') % and returns the corresponding sequence of QPSK symbols % ('S'), % plus the two sequences 'Sc' and 'Ss' containing the real % and imaginary part of each symbol % % Programmed by Guerino Giancola % function [S,Sc,Ss] = cp0203_qpsk_mod(bits) nb = length(bits); % number of bits ns = ceil(nb/2); % number of symbols b0 = zeros(1,ns*2); % zero padding b0(1:nb) = bits; j = sqrt(-1); for s = 1 : ns ba = b0(((s-1)*2)+1); bb = b0(((s-1)*2)+2); k = bb + ba*2; p = ((pi/4)*(2*k-1))-pi; Sc(s) = cos(p); Ss(s) = sin(p); S(s) = Sc(s) + j*Ss(s); end