?? form_ref_matrix.m
字號:
function p=form_ref_matrix(P)
if P==1
a=[-1 1];
b=a;
elseif P==2
bits_in=[1 0 1 1 0 1 0 0];
full_len=length(bits_in);
% Angle [pi/4 3*pi/4 -3*pi/4 -pi/4] corresponds to
% Gray code vector [00 10 11 01], respectively.
table=exp(j*[-3/4*pi 3/4*pi 1/4*pi -1/4*pi]); % generates QPSK symbols
table=table([0 1 3 2]+1); % Gray code mapping pattern for QPSK symbols
inp=reshape(bits_in,2,full_len/2);
mod_symbols=table([2 1]*inp+1); % maps transmitted bits into QPSK symbols
a=mod_symbols;
b=a;
end
p=[];;
temp3=[];
for i=1:2*P
for j=1:2*P
temp2=[a(i); b(j)];
temp3=[temp3 temp2];
temp2=[];
end
p=[p temp3];
temp3=[];
end
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