Hello all, Does anybody have a coding of Peak to Average Power Ratio reduction of ofdm in matlab. I would appreciate any...

Hello all, Does anybody have a coding of Peak to Average Power Ratio reduction of ofdm in matlab. I would appreciate any feedback.... Thanks. Kowsi

Hi, i need to know what filters can be used in order to design an OFDM modem? and how can we stimulate them in matlab?

Hi, i need to know what filters can be used in order to design an OFDM modem? and how can we stimulate them in matlab?

Hello, I'm working on a MIMO-OFDM system simulation in Matlab. I assume a 3 tap multipath channel. My question concerns the Space-Time decoding...

Hello, I'm working on a MIMO-OFDM system simulation in Matlab. I assume a 3 tap multipath channel. My question concerns the Space-Time decoding block at the receiver side. When decoding a ST coded signal, ussually a pseudo inverse of a channel matrix H has to be calculated (zero forcing, MMSE, SIC, OSIC algorithms). In a single tap channel this is a trivial problem. However, my problem is that...

Hi, i m trying to simulate mc-cdma BER performance using MATLAB and since mc-cdma is composed of the integration of DS-CDMA and OFDM so my first...

Hi, i m trying to simulate mc-cdma BER performance using MATLAB and since mc-cdma is composed of the integration of DS-CDMA and OFDM so my first step was building an OFDM model which passes bits on to a "pskmod" mapper and then to "ifft", and the reverse at the receiver side. When integrating with DS-CDMA for multiusers i m facing the problem that "pskmod" function only accepts positive val...

hi all, i'm trying to plot ofdm normalized (dBr) psd after ifft function. i.e: carriers=NFFT.*ifft(tx); %plot normalized PSD i've tried...

hi all, i'm trying to plot ofdm normalized (dBr) psd after ifft function. i.e: carriers=NFFT.*ifft(tx); %plot normalized PSD i've tried pwelch(), psd() and their varients but my results do not match the theory. i'll appreciate some help on the subject. thanks.

Hello Everyone, I started working recently on OFDM. I am trying to use simulink to build a simple system with four sub-carriers. However, I...

Hello Everyone, I started working recently on OFDM. I am trying to use simulink to build a simple system with four sub-carriers. However, I am unable to comprehend the results I am getting. Here is what I am doing: 1. I am using a Bernoulli Binary data Generator 2. It's output is QPSK modulated. 3. After separating the real and complex parts I concatenate the matrix and zero pad it to...

Hi everyone, I am doing Masters thesis in multiuser detection in OFDM. The basic model is y=hx+v . y is the mixture signal recieved by the...

Hi everyone, I am doing Masters thesis in multiuser detection in OFDM. The basic model is y=hx+v . y is the mixture signal recieved by the rxr, h is the channel matrix, x is the original signal txd, v is the noise added in the channel. Each rxr Antenna has to separate its corresponding user signal from the mixture of signals. Can I have the Matlab code for this. I have written the initi...

Hi, I?m trying to calculate the PAPR in OFDM system, but I don?t know why there is no result? I know there is something wrong! Can any one help...

Hi, I?m trying to calculate the PAPR in OFDM system, but I don?t know why there is no result? I know there is something wrong! Can any one help me to get it? this is my program code close all clear all clc; M = 64; % QAM Modulation Level N = 256; % IFFT Size % QAM 16 MODULATION data = qammod(randint(1,N,M),M); % CALCULATE PAPR OF BASELINE OFDM ofdm_out =sqrt(length(data))*iff...

Dear all, I am a newbie and I have a basic question which I would like to get clarified. My intention is to simulate 802.11a which is based...

Dear all, I am a newbie and I have a basic question which I would like to get clarified. My intention is to simulate 802.11a which is based in OFDM. From the 802.11a standard I know that: -Number of Subcarriers, Nsc = 64 -Sampling Rate, fs = 20e6 sample/sec -BW = 20MHz -Carrier Frequency, fc = 5.25Ghz Now imagine that I have the following multipath channel: taps_delay = [0 10ns 20ns ...

Hello, I have already simulated and OFDM system over AWGN channel. Now, I need to apply flat fading and frequency selective fading with...

Hello, I have already simulated and OFDM system over AWGN channel. Now, I need to apply flat fading and frequency selective fading with Rayleigh distribution as my channel effect. I have tried it and my problem is that I do not know which kind of equalizer I should use in order to remove the effect of fading. Anyone has some idea? I would really appreciate it. Sincerely, Saina

i want to investigate the relationship between the signal constellation and the sinc function in OFDM signal i have derived like this ...

i want to investigate the relationship between the signal constellation and the sinc function in OFDM signal i have derived like this FOR EXAMPLE i want to see the effect of 00 then in the signal constellation it can be represented like Aexp(pi/2) in phase domain and in time domain 1/(2*j)[exp(-jwt+pi/2) +exp(-jwt+pi/2)] so i proceed like this i take the integral of t...

Hi, I'm new member in this group. I'm trying to do MATLAB code for OFDM Tx and Rx and measure and plot all the system parameters like BER, PAPR,...

Hi, I'm new member in this group. I'm trying to do MATLAB code for OFDM Tx and Rx and measure and plot all the system parameters like BER, PAPR, Synchronization, Channel Estimation and others. here is my first and starting attempt. can any one help me to complete this program? Regards. Here is my initial program clear all; close all; clc; %=================================================...

Hello I'm working on the implementation of ofdm running on dsps(TMS320c6xxx). I have made my own simulink and matlab mfiles. My question...

Hello I'm working on the implementation of ofdm running on dsps(TMS320c6xxx). I have made my own simulink and matlab mfiles. My question is: Does any one know how to test my work on dsp basd on relating the dsp with my computer by using realtime workshop on matlab 2008 and see how my simulink goes on dsp without writing c or dsp's programming code composer?and then how to optimize this? please ...

hi all I am simulatin ofdm using matlab,with 16QAM digital modulation. now my out put from QAM is a complex number.when i apply this to IFFT i...

hi all I am simulatin ofdm using matlab,with 16QAM digital modulation. now my out put from QAM is a complex number.when i apply this to IFFT i am still getting a complex number(i was hoping to get time varying signal). any help thanks

Hi All ? Im new in this group. I want to say helo to all. I have now only one question " How can I use matLab to make OFDM model that considers...

Hi All ? Im new in this group. I want to say helo to all. I have now only one question " How can I use matLab to make OFDM model that considers the effect of: 1- AWGN (SNR with BER) 2- Fading. and it can shows the amplitude spectrum of the received signal. ? ? Many thanks to all Dr.Abdel-Rahman Al-Qawasmi Head of Telecommunications and Electronics Dept. Engineering Faculty Philadelp...

how OFDM subcarriers are converted in time domain for transmission ? ----------- Regards --------- MUHAMMAD KASHIF

how OFDM subcarriers are converted in time domain for transmission ? ----------- Regards --------- MUHAMMAD KASHIF

Hello guys, I don't know a lot about matlab simulink, so I was wondering if someone can help me so I can figure out the spectrum of an ofdm. I...

Hello guys, I don't know a lot about matlab simulink, so I was wondering if someone can help me so I can figure out the spectrum of an ofdm. I want the complex data out from the transmitter to be analogized separately- I mean the real and imaginary signals each one alone- then digitized by a sampling rate that is twice the value of the digital transmitted signal. Thanks in advance, Huss...

Hi, I am trying to simulate on Matlab a Rayleigh channel for my OFDM signal. I am using the code below to generate the channel...

Hi, I am trying to simulate on Matlab a Rayleigh channel for my OFDM signal. I am using the code below to generate the channel coeficients. The output of this code is a matrix in this case: h = (modified_jakes1(100,2000,10,3,100,0)) is 100 coefficients and 3 multipath chanel.(is this correct?) how can i filter my time domain signal with these coefficient? any idea how to equilize the...

Hi all I want to plot the real and imaginary OFDM overlapped subcarriers by using matlab. How I can plot the spectrum of these subcarriers by...

Hi all I want to plot the real and imaginary OFDM overlapped subcarriers by using matlab. How I can plot the spectrum of these subcarriers by matlab? note: I don't want to plot the composite or absolute values. Thanks in advanced Sami

I try to implement the matlab code on BER for QPSK in OFDM over rayleigh channel (with n taps). However the result is a straight line. There must...

I try to implement the matlab code on BER for QPSK in OFDM over rayleigh channel (with n taps). However the result is a straight line. There must be something wrong in my code but I cannot figure it out what is wrong. Could you please help me to check it. I have to hand the work soon. Please please please help. Thank you very much. [QUOTE]clear; clc; N=64; % FFT size Nsd = 48; % Number of ...