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just please i need brief explanation about papr in ofdm to reduce through precoders
Hi, i am Marina currently working on papr in ofdm using matlab.How do i modify the code below so that i can display papr for N=64,256,512,1024 on the same graph?N is the total subcarriers..:| ************************************************************ function paprofdmA() dataType = 'Q-PSK'; % (...)
I have tried reducing the papr by using slm. But it is not working, can any one help me please? I multiply the ofdm bins by exp(j*pi/4), i.e. a phase offset of 45 degrees but there is not even a change in papr.
can any one explain procedure how DHT precoded matrix reduces papr in ofdm ?
Can anyoune explain to me how to use discrete fourier transform( dct ) in matlab to reduce papr in ofdm?:roll:
In downlink, it seems to be so. In uplink, most companies advocate single-carrier transmission due to the high papr of ofdm. This combination is found in the evoluation of WCDMA and CDMA2000 systems.
Is there any system requires the transmitter to send side information to the receiver? For example, in the reduction of papr in ofdm system, the selective mapping (slm) method and partial transmit sequences (PTS) method require the side information. Is there any other design or system same as above?
i to have same problem but i need to know how to reduce papr in ofdm through precoding .
can any one explain concept of papr? how papr is reduced by dht precoded matrix? if we reduce papr will there be any information loss?? plz anser this??
Hi ll, I want to know whether AWGN affects papr in ofdm ? I am doing some simulations for the papr and found that it is insensitive to the SNR. Is this logical ? I think that when a gaussian random variable is added to ofdm samples
I am implementing codes for Peak to average power ratio (papr) in ofdm system. If anyone of you has already worked in this area, i would be very grateful if you can send me any useful codes. So far I've implemented clipping and phase optimization methods but would appreciate if anyone could help me with other methods like Tone injection,Trellis sha
please keep in touch as soon as you get the MPSK modulation throuth which can reduce papr through some technique.
hello communication engineer, if u don't mine i have doubt about precoding techniques and to have some matlab coding or command because i should reduce papr in ofdm through precoding techniques.
Respected Sir, Can u tell me matlab code for 'BER Vs SNR using companding'. or How can we convert simulink model into matlab code? I have simulink model on the same topic.
Hi I am communication engineering student and I want to simulate papr reduction in ldpc coded ofdm with slm method. could any one help me in writing the matlab code for simulation. please mail me on zstar.mokhtari@gmail.com Thanks.
I understand the method to create Matlab code for papr reduction for ofdm using slm. Please help me or give code to understand Thanks
hey hie, i m working on ofdm papr method by slm without the knowning side information . i need an assistance .....if any one can help with the matlab code of it please post here or mail me on thundereyes.rishu@gmail.com. thanks in advance hope that any of you can provide me the same..
I am doing a project dealing with Peak to average power ratio in ofdm. So, my question here is how am I going to measure the performance if I want to reduce the papr. I know that it is cumulative distribution function vs papr. But how can I get the CDF?
anyone can give me the matlab code for ploting papr vs ber in ofdm
Hello, I am a beginner in ofdm topic and sometimes in literature I found references to baseband papr which is 3 dB lower than the papr measured at the output of the power amplifier. I always thougth at the papr in the latter sense: please could someone clarify me this point? Thanks Mowgli
Hello Friends; I need an answers from who faced this problem which is: I have done a Selected Mapping Technique to reduce the papr for the ofdm system successfully using Hadamard codes as the phase rotating sequences. The problem not in my simulation that I got a bit error rate, it is inside Matlab itself,
I am from Bangladesh, a student of ICT. I am trying to make a thesis on ofdm papr reduction. I want to combine a papr reduction method with a coding technique to do something new. As a new student I am studying about ofdm, papr reduction etc briefly. I am trying daily to reach at the destination. But I am (...)
i am doing work on ofdm 's papr problem. please help me on selective mapping and pratial transmit method..
Hi I wanted to calculate the papr of a ofdm system i am bit confused weather i need to compute papr on entire frame(having many ofdm symbols of 512 subcarriers) or on each ofdm Symbol(of 512 subcarriers) one by one 1 frame can have many ofdm symbols each of 512 (...)
Hi I am communication engineering student and I want to simulate papr reduction in ldpc coded ofdm with slm method. could any one help me in writing the matlab code for simulation. please mail me on e_electric_iust86@yahoo.com Thanks.
I tried reducing the papr by using slm. but there is not even a change in papr can any one help me?
Hi everyone! can anyone help me with the receiver for ofdm signal with papr implemented on Tx side in matlab. i have made the Tx with papr reduced symbols but i am unable to make a Rx that retrieves the information i sent in the Tx side. Also I have made Tx and Rx with simple ofdm (without papr) and they (...)
Knowing that one of the constraints for ofdm system is the high Peak-to-average power ratio (papr), which is a drawback when come to the power amplifier in RF. Is there anyone know, what is the maximum papr we can go for before sature in non-linear region in power amplifier?Any information about this, I mean website or paper? Thanks.
Hi, I am a newbie on this subject. But what is papr? Regards, Davy
Short summarize: LTE is using SC-FDMA, that means ther papr is 0dB. That favor 50% efficient PA's in the mobile versus the basestation should use more linear and less efficient PA's You can assign to each subcarrier a modulation but which must be constant over one ofdm symbol. BSPK-QPSK-16QAM-64QAM-256QAM are typical modulations which are use
In which particual field are you interested in the physical layer or Mac layer. I am more interested in the phy layer. In physical layer there are many topics to deal with such as Channel estimation Equalization and interference mittigation, papr, Channel coding, Channel modelling etc Which particular field are you interested in.
i have link already by what is problem is that it must stimulate MPSK signal in ofdm through linear constellation precoding technique. please help me. Added after 3 minutes: how linear constellation precoding works in ofdm in order to reduce papr
hi gayathri123, please enjoy my group on yahoo. i hope some body can help you regarding the papr. The programs for the basic ofdm was included in the above attachements. Best Wishes
Good day! I want to add there Turbo code and compare the papr values. Thank you why do you want to do that? iirc turbo code has nothing to do with papr, the two are from different domain. Google for SC-FDMA and see how papr are reduced there.
Dear All ; I have work as a telecommunication engineer. I have been making research and preparing thesis regarding with ofdm and its applications for my work . To understand ofdm more and more, I want to simulate it with Matlab. If it is possible, could you supply me a matlab code or codes which are able to simulate ofdm (for
Extending signal points in signal constellation is actually in frequency domain. So, when you extend the signal points smartly, you will reduce the high papr of the ofdm symbols in time domain.
Hi, I am designing a receiver where the transmitted signal is ofdm modulated by DQPSK. As DQPSK has does not have varying amplitude, do I need to design in any papr reduction circuitry. Using QAM, I would expect to do this as the amplitude varies, but I'm not sure when using DQPSK. If it is required, can someone suggest a suitable method. This i
I do not understand the question. papr is measured in time domain. papr=(max(s))^2/E( (s)^2 ) Spectrum flatness does not depend from papr.
Hi everyone. I just designed a simple ofdm transmitter using simulink and I will like to know if anyone could help me know how I can determine the papr of my system. How I can cslculate it using simulink. Also in most ofdm systems they normalise the output after QAM modulation by taking its conjugate and multiplying by a gain, why??? (...)
can anybody have matlab code for PTS algorithm for papr reduction in ofdm. plz reply..
check out this link: Tone Reservation as a papr reduction technique - File Exchange - MATLAB Central
thanx alot but am not studying the effect in relation with papr , i just need the way to plot the BER using different modulation method especially (64-QAM). and relatively plot the PSD.
can anyone please suggest me how to plot the CCDF of slm technique.
Hi all, Can anyone tell me how to assign frequency for the subchannels in anybody have idea of the concept "determing and storing the allowable extension directions for each subchannel in ofdm"...I am working in papr reduction in ofdm using Active Constellation Extension.I am struck up in this stage... Regards, Dharini:smile:
Hi , I've coded in Matlab an ofdmA downlink transmission scheme (ofdm modulation for sure) using QAM for each user, after that i wanted to implement a clipping function to reduce papr (PEAK to Average Power Ratio) until here everything gone fine, i fellowed the clipping function by implementing a pulse shaping filtring to reduce ISI (...)
I have done coding for turbo coded ofdm with a fading channel. Now what other parameter can be considered apart from papr as the BER curve of the code and the papr curve are similar in nature. Suggest some easy parameter as it has to be inserted in the code. Please suggest some base paper if any. Thanks
i am working in papr reduction in ofdm using clipping tecniques, so i need a program which consists of BER performance and cccf plot both, please help me.
coherent optical dft spread ofdm with pdm,help to implement for a radio over fiber system,doing m tech thesis,to reduce papr,simulation using matlab
can ifft provide orthogonlity? which block in ofdm will provide separation of 1/T. T is the time to transmit one symbol. is ifft right? how precoded transform(wht ,dht etc..) decreases papr? ---------- Post added at 12:35 ---------- Previous post was at 12:32 ---------- if mapper does not do modulation in
let say X is the data block with X (k) as the mapped sub symbol(i.e. the symbol from the constellation). Where k = {0, 1, 2, ...........N − 1}. Let the uth phase vector is denoted as B(u),where u = {1, 2, ..........U}. The uth candidate vector that is generated by the multiplication of data block with the phase vector is denoted as X(u). So w