## Forums Search for: OFDM

## Peak to Average Power Ratio reduction

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.

## Carrier over Noise ratio

Dear All, I'm implementing a Matlab DVB-T system; in order to test it, I' like to see if the performance are matching to the ETSI's standard...

Dear All, I'm implementing a Matlab DVB-T system; in order to test it, I' like to see if the performance are matching to the ETSI's standard performances. The problem is the standard ask to set 18 dB for the Carrier over Noise Ratio (C/N)..but I only know how to set the Signal to Noise ratio (SNR)in my code's parameters. Can someone please tell me how to convert the C/N to SNR in the OFDM t...

## Re: C6713DSK to Simulink data transfer

hi jeff i am trying doing the same....can you plz guide.... I have implemented an OFDM communication system in Simulink. I am using Link to CCS...

hi jeff i am trying doing the same....can you plz guide.... I have implemented an OFDM communication system in Simulink. I am using Link to CCS and CCSv3.1 Platinum to build the model and transfer data to one TI C6713 board. The output of the board goes to the input of a second C6713 board. > > The problem is I do not know how to transfer the received data (from the second board) back to simul

## 802.16 (WiMAX) simulation in Matlab - please review and comment

Good morning all; I've been having trouble getting my responses to people's OFDM questions posted correctly. (Operator error I'm sure :-)...

Good morning all; I've been having trouble getting my responses to people's OFDM questions posted correctly. (Operator error I'm sure :-) ) I created a simple 802.16e (WiMAX) simulation. The code is over on the Matlab File Exchange. the URL is http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do? objectId=21672&objectType=file If you search for the File ID it is ...

## Re: matlab code required for ofdm

hi friend check out this code: clc; clear all; close all; %% specification of data parameters % fft...

hi friend check out this code: clc; clear all; close all; %% specification of data parameters % fft length fftlength=256; %Modulation order M M=16; % data generation; mydata=randint(1000,1,2); %% Modulation (mapping bits to symbols) each symbol = 4 bits modulatedData=modulate(modem.pskmod('M',16,'SymbolOrder','binary','InputType','bit'),mydata); %% zero pading paddedData...

## help needed ) TEQ vs. FEQ in OFDM or DMT

Hello everyone. I recently joined this group. I'm a PhD student pursuing equalization. I'm interested in TEQ(shortening filter) and FEQ ( freq...

Hello everyone. I recently joined this group. I'm a PhD student pursuing equalization. I'm interested in TEQ(shortening filter) and FEQ ( freq domain equalization). But to me, it seems that these two have been studied mostly in the context of DMT(DSL). Literature does say that in DSL, delay spread can be up to 100 symbols, thus TEQ and/or FEQ may be needed. But now, in wireless, OFD...

## OFDM partial transmit sequence question

Hello, maybe someone can shed a little light on this subject. I've been researching the different PAPR reduction techniques and I feel like I have...

Hello, maybe someone can shed a little light on this subject. I've been researching the different PAPR reduction techniques and I feel like I have a pretty good handle on the subject although I've reached a road block. I've successfully implemented the selected mapping technique in Matlab but when I implemented the partial transmit sequence technique I got poor results, only a very small PAPR redu...

## Problem with IFFT and FFT in Matlab

inHi, I am working on an OFDM system using Matlab. The bits received at the receiver have a constant error ( i.e., avg 200 bits out of 1000 are...

Hi, I am working on an OFDM system using Matlab. The bits received at the receiver have a constant error ( i.e., avg 200 bits out of 1000 are always wrong).. when I decreased no. of bits in a symbol to let say 49 and FFT length to 64, there was no error. It looks like that there is some error in the computation of IFFT/FFT bolcks by Matlab (maybe some rounding of the data by Matlab). I am unsu...

## PAPR of multiple subcarriers on the same graph

Hello i am currently working on PAPR in OFDM using matlab.How do i modify the code below so that i can display PAPR for...

Hello i am currently working on PAPR in OFDM using matlab.How do i modify the code below so that i can display PAPR for totalSubcarriers=64,256,512,1024 on the same graph?This code only display totalSubcarriers=64. function paprOFDMA() dataType = 'Q-PSK'; % Modulation format. totalSubcarriers = 64; % Number of total subcarriers. numSymbols = 16; % Data block size. Fs = 5e6; % System bandwi...

## C6713DSK to Simulink data transfer

inI have implemented an OFDM communication system in Simulink. I am using Link to CCS and CCSv3.1 Platinum to build the model and transfer data to...

I have implemented an OFDM communication system in Simulink. I am using Link to CCS and CCSv3.1 Platinum to build the model and transfer data to one TI C6713 board. The output of the board goes to the input of a second C6713 board. The problem is I do not know how to transfer the received data (from the second board) back to simulink. Using the Line in ADC block digitizes and transfers the r...

## MUD in MIMO channel

inDear all I have a question about MIMO In Multiuser Detection in MIMO (or MIMO-OFDM) systems using MMSE, when using number of transmit...

Dear all I have a question about MIMO In Multiuser Detection in MIMO (or MIMO-OFDM) systems using MMSE, when using number of transmit antennas is equal number of receive antennas or number of transmit antennas is fewer number of receive antennas, which give the better results? Why? Hope to have your helpings. Thanks

## channel object of matlab

indear all ? does any body use Channel Object of matlab for ofdm signal. like chan = rayleighchan(ts,fd,tau,pdb); ## this is my case Nfft =...

dear all ? does any body use Channel Object of matlab for ofdm signal. like chan = rayleighchan(ts,fd,tau,pdb); ## this is my case Nfft = 1024; BW = 10*1e6; % Factor of correction n=28/25; % sampeling factor .see ieee 802.16e part 8.4.2.3 % Derived Parameteres 8.4.2.4 ieee 80.16 2004 Fs = floor(n*BW/8000)*8000; % Sampling frequency deltaF = Fs / Nfft; % Subcarrier spacing. Tb = 1...

## can the output of QAM be given directly to IFFT ?

inI am doing a project regarding OFDM.I used 64 QAM to modulate the data . The output of QAM is complex. Can the complex output be given...

I am doing a project regarding OFDM.I used 64 QAM to modulate the data . The output of QAM is complex. Can the complex output be given directly to perform IFFT ?

## FFT/IFFT functions in Maltab & DSP same?

I'm currently doing a project on OFDM signal generation. I plan to write my codes in Matlab and later convert it into C and then download...

I'm currently doing a project on OFDM signal generation. I plan to write my codes in Matlab and later convert it into C and then download it into DSPs. My question is, when i use the fft/ifft functions that come with Matlab, when i convert it and download it into the DSP. Will it have any problem? Will the fft/ifft operation be same on the DSP?

## Trouble regarding correlation matrix in LMMSE channel estimation

Hi, I?m currently making a simulation of LMMSE channel estimation for OFDM system using Matlab. To find the LMMSE coefficient we?d use this ...

Hi, I?m currently making a simulation of LMMSE channel estimation for OFDM system using Matlab. To find the LMMSE coefficient we?d use this equation : http://img545.imageshack.us/img545/7605/20080423599a788991f3f8b.png The main problem is I can?t find the correlation matrix (Rhh). What confused me are : 1. Some papers said t Rhh is E(H*H), with H is the channel measurement. But it?s

## Non-Squared QAM

Hello, I have generated non-squared 16-QAM symbols. These are 16 symbols in one constellation and I want to assign this date to...

Hello, I have generated non-squared 16-QAM symbols. These are 16 symbols in one constellation and I want to assign this date to 64element matrix. For clarity, I am trying to generate non-squared QAM symbols to be mapped into 64 subcarriers for OFDM simulation. When I try to perform this, I get an index mismatch error.