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一個(gè)matlab寫的qpsk的調(diào)制與解調(diào)程序

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function?data?=?qpsk(bits?flag)
%?modulate?bits?into?QPSK?symbols?or
%?demodulate?qpsk?symbols?into?bits
%?symbol?is?normalize?to?be?with?engery?1;
%Author?Yi?Jiang?(SALUF)?Jan.?17?2004
N?=?length(bits);
if?flag?==?1??%modulate
????data?=?zeros(N/21);
???for?m?=?1:N/2
??????tmp?=?bits(m*2-1:m*2);??????if?tmp?==?[0;?0]
?????????data(m)?=?1+j;
??????elseif?tmp?==?[0;?1]
?????????data(m)?=?1-

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