GMSK and OFDM codes in matlab

Started by in Matlab DSP17 years ago

Hello, I am a french student to engineering and I am in search a matlab code or codes which are able to simulate GMSK and OFDM...

Hello, I am a french student to engineering and I am in search a matlab code or codes which are able to simulate GMSK and OFDM (for example matlab program which is very good for understanding GMSK OFDM and theirs concepts). I look forward to your reply. Best regards.

Wavelet based OFDM

Started by in Matlab DSP14 years ago

Has anyone worked with wavelets based OFDm. I would like to know how one included the idwt and dwt fucntion for an OFDM code. --...

Has anyone worked with wavelets based OFDm. I would like to know how one included the idwt and dwt fucntion for an OFDM code. -- Regards Oswald Jumira Communications Research Group Room 5.26 Menzies Building Department of Electrical Engineering University of Cape Town P Bag X5 Rondebosch 7701 Tel: +27216504879 Cel: +27720308211 Email: o...@uct.ac.za o...@ieee.org "To raise new...

ofdm simulation (ifft/fft) & NoiseVar

Started by in Matlab DSP17 years ago

Hi all, I have some problems in simulating the OFDM using matlab. I will list them one by one. 1). Normailsation of the signal after ifft...

Hi all, I have some problems in simulating the OFDM using matlab. I will list them one by one. 1). Normailsation of the signal after ifft & fft. Do we have to multiply by any factor after taking the ifft and fft in the matlab?. Please explain me about this for the OFDM symbol with Useful Subcarriers. 2). Finding the NoiseVariance in to create the

CCDF of OFDM

Started by in Matlab DSP9 years ago

CCDF=1-exp{(-e^(-y/2))* N*sqrt(?/3)*logN }-------------------(1) CCDF=1-exp{(-e^(-y))* N*sqrt(?/3)*logN }---------------------(2) Hi...

CCDF=1-exp{(-e^(-y/2))* N*sqrt(?/3)*logN }-------------------(1) CCDF=1-exp{(-e^(-y))* N*sqrt(?/3)*logN }---------------------(2) Hi matlabers, i need help here.eq (1) above is CCDF for a DCT-OFDM while eq (2) is FFT-OFDM.i'm trying to prove that PAPR of eq (1) is lower than eq(2).according to the journal that i referred it is supposed to be so.However i got totally opposite of that.did

simulation of ofdm with QPSK in Rayleigh channel

Started by in Matlab DSP13 years ago

hi; i have simulated a general ofdm system but i am not having correct results. can any one rectify problems in this code. have i used correct...

hi; i have simulated a general ofdm system but i am not having correct results. can any one rectify problems in this code. have i used correct formulas in this code? i mean does RAYLEIGHCHAN command hold for it? do i need to equalize the receiver signal? if so then how and at what stage? and have i used right command for theoritical BER of OFDM in Rayleigh channel? % Script for computing the B...

Pseudo-random sequence and pilots in OFDM

Started by in Matlab DSP16 years ago 3 replies

Hi, i'm doing a project on OFDM and currently i'm just playing around and exploring with the HiperLan/2 demo that comes together with...

Hi, i'm doing a project on OFDM and currently i'm just playing around and exploring with the HiperLan/2 demo that comes together with Simulink. I noticed at OFDM transmission, pilots are inserted and these pilots are single sample datas inserted regularly btwn the actual data. These pilots are generated by a Pseudo-random binary generator block. Wha

PAPR of ofdm signal

Started by in Matlab DSP11 years ago

Hi All, Have anyone done work on implementation of PAPR of OFDM signal for any IEEE paper? Kindly let me know. I need some help on solving IEEE...

Hi All, Have anyone done work on implementation of PAPR of OFDM signal for any IEEE paper? Kindly let me know. I need some help on solving IEEE paper "Complement Block Coding for Reduction in Peak-to-Average Power Ratio of OFDM Signals". How fig 1 to fig 4 would be implemented. Any idea? send me portion of matlab code, if available with you. Thanks, Rizwan

OFDM simulation

Started by in Matlab DSP17 years ago 1 reply

Dear All ;   I have work as a telecommunication engineer. I have been making research and preparing thesis regarding with...

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 possi

PAPR Reduction or Pre-distortion Techniques for OFDM

Started by in Matlab DSP16 years ago

Dear all, If anyone working on Pre-distortion techniques for OFDM or PAPR Reduction Techniques for OFDM ...it is good idea if we get together...

Dear all, If anyone working on Pre-distortion techniques for OFDM or PAPR Reduction Techniques for OFDM ...it is good idea if we get together and discuss the issues and the literature through this forum... What do you think ?.. Waiting for your earliest attention.. Rgds, Jasan

IFFT in OFDM, real output requires conjugate symmetric

Started by in Matlab DSP16 years ago 1 reply

Hi, i've forgotten where i read about this but i know for OFDM, if i want the output of my IFFT to be real, i can only use half of...

Hi, i've forgotten where i read about this but i know for OFDM, if i want the output of my IFFT to be real, i can only use half of the subcarriers with the other half the complex conjugate mirror of the 1st half. It apparantly got to do with the properties of Fourier transform or something like that. I'm currently writing my report on OFDM. Can someone direct me to references or literature...

OFDM symbol genration - IIFT concept

Started by in Matlab DSP17 years ago 3 replies

Hi all I have basic question regarding OFDM symbol genration.IFFT is taken to genrate a OFDM symbol.that part is undersood. My...

Hi all I have basic question regarding OFDM symbol genration.IFFT is taken to genrate a OFDM symbol.that part is undersood. My question is that whether that IFFT taken is complex or real.i believe it is complex as the ouput is shown to be assymetrical.so if it is complex,the data to be transmitted also has to be complex. from where we fill

no of subcarriers in OFDM

Started by in Matlab DSP15 years ago 1 reply

I am doing a project related to OFDM. My doubt is whether the no of subcarriers and the IFFT size should be equal or not?

I am doing a project related to OFDM. My doubt is whether the no of subcarriers and the IFFT size should be equal or not?

Started by in Matlab DSP18 years ago

Hi.. does anyone have a source code to synchronize the carrier offset timing for a OFDM signal ?

Hi.. does anyone have a source code to synchronize the carrier offset timing for a OFDM signal ?

Blind OFDM Channel Estimation Using FIR Constraints

Started by in Matlab DSP11 years ago

Hi everyone, im currently involved in some research concerning blind channel estimation in ofdm systems. Within this intercourse i stumbled...

Hi everyone, im currently involved in some research concerning blind channel estimation in ofdm systems. Within this intercourse i stumbled upon the paper "Blind OFDM Channel Estimation Using FIR Constraints: Reduced Complexity and Identifiability" (link http://www.ifp.illinois.edu/~singer/journalpapers/SongSinger07.pdf) , which describes a Finite Alphabet based Algorithm (in paper call...

ofdm simulation

Started by in Matlab DSP13 years ago 2 replies

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

OFDM and frequency-domain equalization

Started by in Matlab DSP14 years ago 2 replies

How are you everyone. In OFDM links, do we need frequency-domain equalization(FDE), after FFT block of the receiver? In books, it seems that...

How are you everyone. In OFDM links, do we need frequency-domain equalization(FDE), after FFT block of the receiver? In books, it seems that FDE is need if we have a TEQ (channel shortening time domain equalizer) as was studied by Al-Dhahir, etc. With TEQ, there will be phase errors, and I think that FDE can restore the phase. But I think that we don't actually use TEQ in OFDM links mo...

Newbie to OFDM

Started by in Matlab DSP14 years ago 1 reply

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...

LMMSE comb-pilot OFDM

Started by in Matlab DSP12 years ago

Dear all, I have a problem in understanding LMMSE channel estimation in comb-pilot type of OFDM. I get stuck to find the auto covariance matrix...

Dear all, I have a problem in understanding LMMSE channel estimation in comb-pilot type of OFDM. I get stuck to find the auto covariance matrix of the pilot channel. for example: I have a channel impulse response (CIR) of length 30 and my OFDM symbol has 128 subcarriers. I place the pilot at 1:16:128. In order for me to find the channel in freq. domain is by FFT the CIR with zero padding it to 1...

OFDM

Started by in Matlab DSP13 years ago 2 replies

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...

For OFDM Simulation

Started by in Matlab DSP16 years ago

Hello, Diana Knight. Hope you read this mail. You are looking for an OFDM simulation using Matlab. Jeff Winter had given you a file. I known...

Hello, Diana Knight. Hope you read this mail. You are looking for an OFDM simulation using Matlab. Jeff Winter had given you a file. I known this by searching past message in dsprelated. I am doing my M.Sc on Telecommunicaions. Could you please send me this file. It would be very helpful to me and for my study. Bye.