Comments on: Trying out PAPR reduction for OFDM by multiplication with j http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/ Signal Processing for Communication Thu, 04 Mar 2010 16:31:39 +0530 http://wordpress.org/?v=2.8.4 hourly 1 By: Orson http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-18851 Orson Sun, 31 Jan 2010 21:17:04 +0000 http://www.dsplog.com/?p=190#comment-18851 hello i have some problems in caculating the PAPR of 16-QAM for example max_power=max(X.*conjX) and mean_power=mean(X.*conjX) then papr=min(10*log10(max_power./mean_power)) right? hello
i have some problems in caculating the PAPR of 16-QAM
for example
max_power=max(X.*conjX)
and
mean_power=mean(X.*conjX)
then
papr=min(10*log10(max_power./mean_power))

right?

]]> By: vinothkumar http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-17843 vinothkumar Tue, 05 Jan 2010 16:25:06 +0000 http://www.dsplog.com/?p=190#comment-17843 sir, In matlab script of computing papr in HT-LTF, what is the meaning and need of using [],2. please explain the concept sir, In matlab script of computing papr in HT-LTF,
what is the meaning and need of using [],2. please explain the concept

]]> By: Krishna Sankar http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-17366 Krishna Sankar Wed, 23 Dec 2009 00:37:14 +0000 http://www.dsplog.com/?p=190#comment-17366 @velan: Well, why do you want to have a threshold while plotting the CCDF value? @velan: Well, why do you want to have a threshold while plotting the CCDF value?

]]> By: Krishna Sankar http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-17363 Krishna Sankar Wed, 23 Dec 2009 00:28:31 +0000 http://www.dsplog.com/?p=190#comment-17363 @Ahmed: Well, to prevent the power amplifier to operate in the nonlinear region, we can reduce the signal power (with the penalty of efficiency) such that the peak of the signal does not cause the PA to move into the non-linear region of operation. @Ahmed: Well, to prevent the power amplifier to operate in the nonlinear region, we can reduce the signal power (with the penalty of efficiency) such that the peak of the signal does not cause the PA to move into the non-linear region of operation.

]]> By: velan http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-17202 velan Sat, 19 Dec 2009 03:29:57 +0000 http://www.dsplog.com/?p=190#comment-17202 Hai all. I would like to know the fixing/deciding the threshold for PAPR value while finding CCDF for various methods. Hai all. I would like to know the fixing/deciding the threshold for PAPR value while finding CCDF for various methods.

]]> By: Ahmed http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-17150 Ahmed Thu, 17 Dec 2009 04:13:17 +0000 http://www.dsplog.com/?p=190#comment-17150 The detrimental effect of high PAPR, as we know, is due to the non-linear nature of Power amplifiers. In this respect, can you help to incorporate amplifier back-off in to HPA simulation. Just for your reference the following link http://www.mathworks.com/matlabcentral/fileexchange/15331-ofdm-high-power-amplifier-effects simulates a non-liner amplifer. I will be obliged if you can share your thoughts abou how to incorcorporate output backoff in this code. Thanks a lot Ahmed The detrimental effect of high PAPR, as we know, is due to the non-linear nature of Power amplifiers. In this respect, can you help to incorporate amplifier back-off in to HPA simulation. Just for your reference the following link http://www.mathworks.com/matlabcentral/fileexchange/15331-ofdm-high-power-amplifier-effects
simulates a non-liner amplifer. I will be obliged if you can share your thoughts abou how to incorcorporate output backoff in this code.
Thanks a lot
Ahmed

]]> By: Ahmed http://www.dsplog.com/2008/07/02/ofdm-papr-reduction-multiplication-by-j/#comment-16910 Ahmed Thu, 10 Dec 2009 06:07:52 +0000 http://www.dsplog.com/?p=190#comment-16910 Just for an update..I did find difference in the estimation.there was a bug in my previous code I guess. One request. Can you help to incorporate amplifier back-off in to HPA simulation. Just for your reference the following link http://www.mathworks.com/matlabcentral/fileexchange/15331-ofdm-high-power-amplifier-effects simulates a non-liner amplifer. Iwill be obliged if you can share your thoughts abou how to incorcorporate output backoff in this code. Thanks a lot Ahmed Just for an update..I did find difference in the estimation.there was a bug in my previous code I guess.
One request. Can you help to incorporate amplifier back-off in to HPA simulation. Just for your reference the following link http://www.mathworks.com/matlabcentral/fileexchange/15331-ofdm-high-power-amplifier-effects
simulates a non-liner amplifer. Iwill be obliged if you can share your thoughts abou how to incorcorporate output backoff in this code.
Thanks a lot
Ahmed

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