Re: Ofdma_ partial transmit sequence
thank you so much....but I still have doubt in what is phase rotation combination?? for which signal we have to find papr,is it for X1,X2....?
phase rotation use to rotate the phase of OFDM signal
as i know, there are two kind phase rotation i.e phase rotation with weighting factor W=2 and phase rotation with weighting factor W=4
weighting factor W=2 using +1 and -1
weighting factor W=4 using complex number for example 1+j
for signal,
X=[a1,b1,c1,d1,a2,b2,c2,d2,a3,b3,c3,d3,a4,b4,c4,d4]
if you chose to make 4 subblock,then X become;
X1=[a1,b1,c1,d1,0,0,0,0,0,0,0,0,0,0,0,0];
X2=[0,0,0,0,a2,b2,c2,d2,0,0,0,0,0,0,0,0];
X3=[0,0,0,0,0,0,0,0,a3,b3,c3,d3,0,0,0,0];
X4=[0,0,0,0,0,0,0,0,0,0,0,0,a4,b4,c4,d4];
if we use W2, so we generate phase rotation combination, for example:
mb1=[1 , 1,-1,-1];
mb2=[1 ,-1, 1,-1];
mb3=[-1,-1, 1, 1];
mb4=[-1, 1,-1, 1];
mb5=[ 1, 1, 1, 1];
mb6=[-1,-1, 1, 1];
mb7=[-1,-1,-1, 1];
mb8=[-1, 1,-1,-1];
and we multiply each subblock with this phase rotation combination, and we choose the lowest PAPR from the result