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What is the code for a partial transmit sequence?

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zunayeed

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can anybody help me with the code of partial transmit sequence as papr reduction in ofdm in matlab ?
 

prag

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Re: Ofdma_ partial transmit sequence

i am doing project on PAPR reduction in OFDM signals using PTS scheme..but i am not getting what actually Partial transmit sequence means..i would be greatful to you if you can explain me....thanks in advance
 

cokibolong

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Re: Ofdma_ partial transmit sequence

partial transmit sequence is a methode for reducing PAPR by divide bit stream into few subblocks then multiply the subblocks with few combination of phase rotation, and choose the lowest PAPR each subblock.
for example:
we have signal X
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];
then each subblock X1,X2,X3,X4 multiply with few phase rotation combination. then IFFT. chose the lowest PAPR. and you can add X1+X2+X3+X4
 

prag

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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....?
 

cokibolong

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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
 
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Re: Ofdma_ partial transmit sequence

Thanks a lot again .....do we multiply X1 with mb1,mb2......mb8 , X2 with mb1,mb2....mb8...and so on and calculate PAPR for X1mb1,X1mb2 and so on, add those with low PAPR, like if X1mb1,X2mb1,X3mb1 and X4mb1 each have lowest PAPR then we add X1mb1+X2mb1+X3mb1+X4mb1 and transmit the sum signal as OFDM signal?? please help, I am really confused...
 

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Re: Ofdma_ partial transmit sequence

yes, that's true
 

prag

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Re: Ofdma_ partial transmit sequence

it is said that the computational complexity for the optimum phase factors is large in the case of PTS....why is it so??
 

cokibolong

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Re: Ofdma_ partial transmit sequence

computational complexity depends on number of process that pass through system. may be multiplication and addition process. in PTS, length of phase rotation equal than length of subblock, so multiplication occur in all subblock with different value of phase. in slm, we use only one value of phase rotation each subblock. so that pts more complex than slm
 
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prag

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Re: Ofdma_ partial transmit sequence

I am stuck at the coding of PTS scheme with low computational complexity...can you help me with it??
 

singhmangal

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Re: Ofdma_ partial transmit sequence

Me too... if anybody is working on PTS scheme with low computational complexity, plz share the codes....
 

prag

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Re: Ofdma_ partial transmit sequence

what is the title of ur base paper?? i have problem understanding my paper too..so we can discuss the paper if our titles are same..
 

garima singhal

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Re: Ofdma_ partial transmit sequence

Does anybody have PTS code in ofdm?
 

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