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Technical discussion about Matlab and issues related to Digital Signal Processing.
Search Results for "ifft"
FFT and IFFT in OFDM
ping...@hotmail.com - Jun 12 2005
Can we use directly the FFT and IFFT functions in Matlab for OFDM simulation? I found IFFT(AWGN) will result in strange mean and variance.
... 
ifft in matlab [3 Articles]
edu_forme - Jun 29 2008
i want to compute the ifft of the following data
data=[0 1 1 0]
in matlab it should return me a single value but it is giving me a
column of values can anybody explain th... FFT and IFFT
eddylamhk - Oct 28 2003
Hi,
I want to ask if I FFT an image, how can I recover the image using
IFFT. I try to use it directly, but turn out some a totally bright
picture. However, when i... problem with IFFT and sampling time
saini_s1978 - Sep 18 2005
Hi everybody,
My problem is as follows:
I get data from a fft analyser after numerous averaging in order
to remove the noise. Now in order to use it i have to take the IF... 2D IFFT on array data to get angle of arrival
- Mar 14 2005
Hi,
Currently,I have an 10x10 array of channel impulse response data. I
need to get spatial angle of arrival,azimuth and elevation angle
image informatio... FFT/IFFT functions in Maltab & DSP same?
vcte...@yahoo.com - Jul 27 2005
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... csd ifft
noriakk - Feb 11 2005
Hi,
I compute the cross spectrum, using the CSD function, and I am trying
to represent it in time-domain using IFFT (see example below). But
what I got i... ofdm simulation (ifft/fft) & NoiseVar
sundar janaa - Jun 10 2005
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 b... Help with FFT and IFFT [6 Articles]
marc...@gmail.com - Apr 13 2008
Hi!!
I am new to matlab so please bear with me. I don't understand the IFFT and FFT matlab functions. Here is the code i am using:
[sig,fs]=wavread('aemixed.wav');
time=(1:l... Why this particular code doesnt work? [3 Articles]
Sreeram - Feb 28 2006
sig=wavread('path to signal file');
reconstructed_sig=ifft(fft(sig));
subplot(2,1,sig);
plot(sig);
subplot(2,2.reconstructed_sig);
plot(reconstructed_sig);
i know that to anal... Finding a Faster Way [4 Articles]
ygamez - Jan 2 2004
Here is the code snipet i need help with...
for i = 1:end_frame
for j = 1:1024
fout(i,j) = ifft(Z(i,j));
end
end
As you can see, if the end_frame is l... mapping symbols onto carrier waves? ifft? [2 Articles]
Johnny - Jul 19 2007
so i'm venturing into communications research and i'm stuck on how to
change symbols into the time domain. i have modulated bits, say [0 1]
which in bpsk is just -1 and 1. how do... frequency selective fading for OFDM [2 Articles]
nishchal chaudhary - Mar 25 2005
hii all,
I am trying to make a simulation program for OFDM.My
modulation technique is BPSK.after doing the mapping of original to
BPSK signal space, I am taking sa... OFDM symbol genration - IIFT concept [3 Articles]
sandeep kumar - Jun 8 2005
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... FFT and IFFT
mb_for2003 - Aug 23 2003
I have signal x = sin(2*pi*2*t) + sin (2*pi*5*t) + noise(0.1).
Could any one tell me how to obtain signal y = x - noise(0.1) in time
domain? I do not know how to us... general filtering
ajabx - Aug 3 2005
Hello
anyone can please explain me when filtering by FFT,
what is the diference between filtering the normal spectrum and iFFT
and filtering the power spectrum and t... IFFT for OFDM
hat_zak2002 - Feb 25 2004
I write this code to get IFFT for y but only spectrum drawn not time
domain siganal ploted:
t = -5:0.001:5;
y1 = sin(pi*(t+1))./(pi*(t+1));
y2 = sin(pi*(t+2)... FFT / IFFT twiddle factor
er_gaurav_rastogi - May 10 2006
Hi all ,=20
I am trying to implement IFFT in vhdl . I tried to use the=20
matlab , but not sure how can i get the twiddle factor . Is it=20
possible to get the twi... OFDM PSD [2 Articles]
disa...@gmail.com - Oct 23 2007
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 ... IFFT in OFDM, real output requires conjugate symmetric [2 Articles]
vcteo - Apr 17 2006
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... y-axis of IFFT [3 Articles]
rongfenc - Mar 9 2002
I have a question. There is a signal which x-axis is freq. and y-axis
is Power Spectrum Density. After convert this freq. domain signal to
time domain(using IFFT), ... Problem with IFFT and FFT in Matlab
waqasabdullah85 - Mar 18 2010
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... can the output of QAM be given directly to IFFT ? [3 Articles]
jahn...@yahoo.co.in - Dec 26 2006
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 ?
... using ifft in MATLAB
bclark2125 - Apr 4 2003
I am having trouble getting the following problem to work-can anybody
help me?
problem:Obtain the 1024-point inverse FFT of a sequence of numbers
whose imag... Filtering PWM in MATLAB
k2lr...@arrl.net - Jul 6 2009
Hello all. I am relativele new to using MATLAB for DSP related work, and I am looking for some direction/help. I am attempting to model a PWM signal, and how the output would loo... using IFFT in matlab
rongfenc - Mar 4 2002
I meet a problem which is to convert a signal from frequency domain
into time domain. I tried to use IFFT to convert it but I did not
succeed.
If you are interes... IFFT in OFDM Simulation
ping...@hotmail.com - Jun 11 2005
I have met the same problem in simulating an OFDM system in baseband. When I
finished a single-user BPSK modulated simulation in flat Rayleigh fading
channel. The BER per... my first ofdm
seba...@gmail.com - Jun 30 2009
Hi guys this is "my first" ofdm code.could you tell me how it is and how to add
the cyclic prefix?
Another question is:
in the function ifft should i insert the IFFT SIZE?
... zero padding question
phil...@nrc.ac.uk - Jan 31 2008
I have a question that has been bugging me fo rsome time and I am hoping someone here can help me get to the bottom of it. It is a zero padding & FFT issue.
Here goes;
If I tak... OFDM partial transmit sequence question
cool...@hotmail.com - Oct 4 2006
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 subje... Unexpected oscillations in the impulse response [2 Articles]
kamr...@gmail.com - Jul 9 2008
Hi all! My question is about getting the impulse response from the transfer function of a system.
I have simulation data for the transfer function of an LTI system. I make the ... implementing rayleighchan in OFDM
burkaycan - Aug 13 2007
Hi everbody,
I am doing my M.SC thesis on the topic "ICI cancellation in OFDM". I
have very limited time, if you can help me I will be grateful to you....
I can implement th... Signal processing help required [2 Articles]
phil...@nrc.ac.uk - Jan 8 2008
I am de-convolving A and B by the standard method of taking FFTs of both time signals and dividing FFT of B by FFT of A, then taking the iFFT of the result to get the de-convolved ... Re: Phase wrapping when performing FFT...?
Jeff Brower - Aug 15 2006
Alex-
> I've been trying to correct for phase wrapping in my wavefront and I
> understand now why it occurs when I plot say angle(wavefront)...the
> inverse tan function in... PAPR [2 Articles]
mohamed hussien - Apr 10 2008
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 progra... problem with mxSetPr / mxSetPi
robe...@gmail.com - Nov 10 2008
Hi, I'm an Italian student working on my thesis and I'm having some problems with mxSetPr and mxSetPi.
Im implementing a Steered Response Power but its really slow, so i decided... Higher resolution FFT
Maria Mount - Jan 21 2004
Hi,
Thank u all for being so nice and supporting . Now there is another
technique of getting higher resolution fft i have learned from mathematical
journal withou... power spectral density
Mohammed Ali - Oct 15 2008
Please i need help in PSD to compare between different methods of PAPR.
When apply the following code not given the same plot as in your paper .
My Matlab code
N... Generating correlated data with a given power spectrum.
"Orlando C. Rodriguez" - Apr 1 2008
Hi there.
I'm working with realizations of random correlated data using a given
power spectra (no correlation matrix is given).
What I do to perform such realizations is that... Two Path Rayleigh Channel
mabr...@gmail.com - Jan 22 2009
Hi
Please see this code , I am confused how i added the two version of signal received from two Taps with one sample delay.Initially I have done IFFT of the signal with Four sub...