Comments on: Peak to Average Power Ratio for OFDM

By: mohanajaishankar

mohanajaishankar — Mon, 22 Feb 2010 07:31:08 +0000

I have decided to do my research on papr on ofdm .Can u please tell me Recent techniques of papr on which i can work.

By: Solid M

Solid M — Sat, 20 Feb 2010 02:11:59 +0000

Respected Sir,

Currently working on PAPR and your Comments really helped a lot, now i have 2 questions

1. How to plot Pr(PAPRx>PAPR0) vs PAPRo(dB), which is in fact another view of PAPR performance i think, it gives you BER kind of water falling curve. How do i plot that?

2. what are the “characteristics of a signal” that cause this PAP problem,
I mean if we would have known about the features are going to cause this problem, we could think about some new techniques to reduce this PAPR stuff.

Thank You..

By: rezgui

rezgui — Sat, 02 Jan 2010 17:08:10 +0000

thanks a lot for these demonstration

By: Ayesa

Ayesa — Sat, 02 Jan 2010 16:26:35 +0000

Hi. Do you have the code for SNR and BER of a QAM (QPSK is 4-QAM) OFDM signals? I am trying to find the BER. But i think my code does not work properly. If you have the code, please send the code at this email address: ayesaparvin@yahoo.com.
Thanks.

By: Krishna Sankar

Krishna Sankar — Tue, 22 Dec 2009 00:31:36 +0000

@Mahesh: My replies
1), 2) Well, you can try to modify the BER in OFDM code to display BER and PAPR too.
2) http://en.wikipedia.org/wiki/Crest_factor

By: Krishna Sankar

Krishna Sankar — Tue, 22 Dec 2009 00:29:47 +0000

@Mahesh: Sorry, I am not familiar with the topic which you are proposing.

By: Mahesh R

Mahesh R — Sat, 12 Dec 2009 11:14:47 +0000

Hi Mr.Krishna!!!

http://www.dsplog.com/2008/02/24/peak-to-average-power-ratio-for-ofdm/
in this code you have calculated the PAPR of the OFDM signal,

also,
http://www.dsplog.com/2008/06/10/ofdm-bpsk-bit-error/
in this code you have calculated the BER of the OFDM signal,

but,
(1)how to calculate the BER of the OFDM signal in that previous(PAPR) coding itself,
i tried to calculate that with that previous coding, but it ends up with failure results and i don’t know how to calculate it there too…
(2)Can you guide me how to calculate the BER of the OFDM signal in that PAPR coding itself…
(maheshr.ece@gmail.com this is my id)…
(3)also i want to know more about PAPR problems and its impact with Power Amplifiers too.. just provide me the links…

with hope and Lot of thanks,
Mahesh R