1000 Threads found on edaboard.com: Frequency Domain Equalization
frequency domain equalization is said to be less computationally complex as compared to time domain equalization why? where can I find the analysis? could you send mail me the paper
Digital Signal Processing :: 03-11-2006 10:34 :: udit :: Replies: 1 :: Views: 1228
Can anyone help me implementing single carrier frequency domain equalization (SC-FDE) in continuous time in MATLAB, please? I have the math, but I don't know how to do it in MATLAB!!
Digital communication :: 02-09-2014 15:10 :: David83 :: Replies: 5 :: Views: 632
I am reading a paper on equalization on frequency domain, and the author says that to convert the MMSE in the time domain we need first to expand the transmitted sequence and the equalizer coefficients from say M samples to some N>=2M-1 samples by padding zeros. Why is that?
Digital communication :: 10-09-2011 16:22 :: David83 :: Replies: 0 :: Views: 495
can someone give me brief explanation about time domain equalization and how different it is from frequency domain equalization, also I would appreciate if you guys could help me with some matlab codes to start working on this area
thnk u in advance
Digital communication :: 01-08-2011 11:15 :: riad86 :: Replies: 0 :: Views: 489
Time domain equalization is done by using "all pass networks." These are a quad of two left half plane poles and two right hand plane zeros. (You can also use a real LHP pole and RHP zero pair for frequencies near DC.) These produce a time delay near the pole frequency without any amplitude changes. You adjust the real and imaginary (...)
Other Design :: 12-16-2002 14:21 :: flatulent :: Replies: 1 :: Views: 1217
Phase noise and AM noise measurement in the frequency domain
RF, Microwave, Antennas and Optics :: 04-14-2003 09:15 :: HO_220 :: Replies: 0 :: Views: 1511
No. FDTD is time domain method, FDFD is frequency domain method and is meaningful different particurarly about computational solution.
Electromagnetic Design and Simulation :: 04-14-2005 09:00 :: yuyu :: Replies: 4 :: Views: 2161
What you said is correct; only you forgot one important thing. There is no such thing as delta impulses in real design. The best pulse you can get is a few ps width, depending in your technology. So your frequency domain representation for this IS limited.
Another thing: suppose you could make a delta impulse. Any transistor in the signal chain
RF, Microwave, Antennas and Optics :: 11-15-2004 13:39 :: radiohead :: Replies: 5 :: Views: 3511
a time domain solvers:quit suitable for transient,but when frequency is high ,it will need a lot of time.
a frequency domain :more efficiency for nonlinear problem,usualy for steady problem.
So such as MWR,integrate the HB method,and pspice method.
In the EM FDTD just in time domain,they can get (...)
Electromagnetic Design and Simulation :: 11-20-2004 04:48 :: IICCEE :: Replies: 2 :: Views: 3855
Suppose I have a frequency domain reflection coefficient measurement G(i), wher G(i) was measured at frequency f0+i*df. The frequency step is df, the starting frequency is f0, but f0 is not an integer multiple of df.
This means we have equidistant measurement points on the unity circle, but the points (...)
Digital Signal Processing :: 01-18-2005 04:03 :: radiohead :: Replies: 0 :: Views: 1225
AM and FM signal's spectrum consists of 2 sided spectrum shifted up to the carrier frequency. The negative frequencies are a mathematical exactness, but are essential since otherwise it would be missing the lower sideband in the original spectrum.
RF, Microwave, Antennas and Optics :: 10-17-2005 05:56 :: vfone :: Replies: 1 :: Views: 706
Can someone explain me more how to use the frequency domain solver??
I don't understand very well what means: 'solves the problem for every frequency separtely'.
Then there is something else: 'this FD use a special broadband frequency sweep technique in order to derive the full broadband spectrum from a relatively small (...)
Electromagnetic Design and Simulation :: 10-19-2005 12:18 :: hapciu :: Replies: 0 :: Views: 771
in time domain it is possible to use probes to get the signal (e-field, h-field) into one point. how can i get the signal into one point in frequency domain?
thx to all!
maybe this time someone can realy give me an advice????????????
Electromagnetic Design and Simulation :: 11-03-2005 10:04 :: hapciu :: Replies: 2 :: Views: 630
I trully believe that it is a question of notation, try to figure out if the both representantion regards to the frequency domain of the signal ( Its fourier representation) if so, dont worry about each author choose his way to present the subject.
Digital Signal Processing :: 01-22-2006 17:44 :: claudiocamera :: Replies: 4 :: Views: 652
Your question is not clear. I'm guessing that you have a file of audio samples like a .wav file of PCM data.
If your data contains most of it's energy at one frequency eg sine or sqaure wave you can process the samples to remove any DC offset then count the number of samples between zero crossings.
If you have data such as a recording of voic
Digital Signal Processing :: 01-23-2006 23:19 :: throwaway18 :: Replies: 2 :: Views: 646
I agree, that is a bit difficult to understand; however, I don't think you need this to prove the theorem.
Physically (in the extreme cases), this theorem is saying that time domain dc signals look like impulses in the frequency domain and time domain impulses look like constants in the frequency (...)
Digital Signal Processing :: 02-07-2006 21:38 :: v_c :: Replies: 3 :: Views: 1238
Signals are converted from time or space domain to the frequency domain usually through the Fourier transform. The Fourier transform converts the signal information to a magnitude and phase component of each frequency. Often the Fourier transform is converted to the power spectrum, which is the magnitude of each (...)
Digital Signal Processing :: 03-23-2006 03:52 :: tamerakshar :: Replies: 2 :: Views: 2682
A good article on understanding DSP's frequency domain
Digital Signal Processing :: 03-23-2006 05:02 :: radheshbhat :: Replies: 0 :: Views: 749
as we know, according IFFT, we can convert a signal from frequency domain to time domain, the problem is , if the result of IFFT is complex, then what's the time-domain signal, the real part of IFFT or something else? And what's the physical meanings of the imaginary part of a time-domain signal?
i am (...)
Mathematics and Physics :: 04-20-2006 04:39 :: amigo_pp :: Replies: 10 :: Views: 1619
But remember that we never achieve the average perfectly. That will require a low pass filter having a cutoff frequency of 0 Hz. Thus low pass filtering always leaves the low frequency components. If these components are of small amplitude, then we get something near to the average.
Analog Circuit Design :: 06-15-2007 14:00 :: nvd :: Replies: 3 :: Views: 3159
can any one help me to simulate a iterative(turbo) frequency domain equalization?
its diagram and paper has attached.
my essential problem is MAP decoder and the relationship between SNR andBER.
Excuseme the site for download the paper is
Digital communication :: 08-10-2006 17:35 :: MOHAZAD :: Replies: 0 :: Views: 605
I can show that convoluntion in time domain is multiplation in frquency domain. However, Can anyone help me show that multiplation in time domain is convolution in frequency domain? like this : v(t)w(t) -> V(f)*W(f)
thanks in advance!
Digital Signal Processing :: 08-29-2006 00:39 :: lekhoi :: Replies: 2 :: Views: 603
frequency domain equalizers are much simpler that time domain equalizers.
In OFDM we implement equalizer after FFT,so here frequency domain equalizer is a simple Equalizer = FFT out/(CHannel Estimate) .
Digital communication :: 09-03-2006 07:18 :: ravurig :: Replies: 4 :: Views: 829
Which signal appears same in frequency domain and timedomain
Digital Signal Processing :: 09-27-2006 11:31 :: senkadir :: Replies: 1 :: Views: 738
Here is a simulink model for BPSK modulator. The output seems fine. Now I want to see the BPSK spectrum. I'm not able to obtain the frequency domain view of BPSK signal. HOw do I do that?
Digital communication :: 11-16-2006 12:15 :: magnetra :: Replies: 10 :: Views: 3462
Can any one refer some material on the frequency domain Equilizers (FDE) ????
Digital communication :: 01-19-2007 22:59 :: bee :: Replies: 0 :: Views: 396
The fundamental of a half-wave rectified sine wave is equal to the input fundamental frequency. The fundamental of a full-wave rectified sine wave is equal to twice the input fundamental frequency.
For the fourie series of each see, for example:
Electronic Elementary Questions :: 01-22-2007 10:36 :: Kral :: Replies: 7 :: Views: 1725
iam doing a project in digital image processing.i have to implement feature detection on an image in frequency domain(phase please send me a link to find a free e-book on above topic.
Digital Signal Processing :: 01-26-2007 10:44 :: pmspraju :: Replies: 0 :: Views: 653
I am trying to display time domain signal in frequency domain using Matlab.I took frequency of signal as 100hz and sampling frequency as 1000sampels/sec
I have tried using 'fft' function but not getting.
Anyone of you give me the solution for displaying frequency (...)
Digital Signal Processing :: 02-24-2007 13:05 :: tarakapraveen :: Replies: 3 :: Views: 1968
Hi i friends,
I have one doubt in OFDM.We are using IFFT for the purpose of baseband modulation.The function of the IFFT is to convert frequency domain to timedomain.But how we are giving the input in frequency domain.
1)We are generating data
Where the (...)
Digital communication :: 03-24-2007 23:41 :: tarakapraveen :: Replies: 2 :: Views: 1505
any signal(e.g speech) can be synthesized using summation of sinosoids. fourier transform(used for continous and non-periodic data) gives the contribution of all sinosoids (each with different frequency) in the synthesis of a particular signal.
Digital Signal Processing :: 04-27-2007 01:03 :: plc :: Replies: 4 :: Views: 1778
i want to know y we have to do fourier transform and know the frequencies. iam a novice in thiis field and i want to know y the signal have to be converted to frequency domain. pls any one help me. and y we use DFT kin of algorithms
Digital Signal Processing :: 04-25-2007 01:28 :: rajsrikanth :: Replies: 4 :: Views: 852
I want to use an object in ADS to model Y parameter in the frequency domain.
for example Y(f1) = Y1, Y(f2) = Y2, Y(f3) = Y3, ...
can you help me?
RF, Microwave, Antennas and Optics :: 06-03-2007 11:49 :: hamidrezakarami :: Replies: 0 :: Views: 485
I'm a newbie ...
We are benchmarking EM software for applications mainly at 13.56MHz.
I think it's better to choose a frequency domain EM software for these low frequencies.
HFSS seems to be good for that but what do you think of the frequecy domain solver of CST?
Its interface is more friendly but what are its performance vs (...)
Electromagnetic Design and Simulation :: 09-25-2007 03:32 :: zorg :: Replies: 0 :: Views: 998
New to DSP.
Need to convert a data set from acceleration to velocity.
Is the integration process best done in time domain or frequency domain? Haven't found a DSP text that addresses this question.
Digital Signal Processing :: 10-05-2007 07:45 :: jmarkwolf :: Replies: 14 :: Views: 9332
How we can separate two signals that overlap in frequency domain ?
one signal is narrow (10 MHz bandwidth) and stronger and another signal is wide band (50 MHz) and weaker than.
which software methodes exist in this subject?
Digital communication :: 10-11-2007 09:02 :: manasiri :: Replies: 4 :: Views: 923
Can anybody explain or help by sending relevant paper that how using walsh transform i am shifting from time domain to frequency domain.
Digital communication :: 12-18-2007 01:09 :: swagata :: Replies: 0 :: Views: 649
I am working with rectangular waveguide to coax/microstrip transitions and some people have recomended me to run the frequency domain solver after having run the transient one. I would like to know how to manage with frequency solver menu and why it is important to run both solvers over the same structure.
Thank you in advance!
Electromagnetic Design and Simulation :: 12-18-2007 04:36 :: Clara_Rios :: Replies: 4 :: Views: 3264
can anyone help me in understanding pass band signal and their representation in frequency domain.
waiting anxiously for help.........
Digital communication :: 02-20-2008 12:47 :: vini_rathi :: Replies: 3 :: Views: 909
In CST i read that the frequency domain solver is better used with structure having dimensions less than the wavelength. So i had my sturcture and got good results using frequency domain solver. I tried to simulate the same structure with Transient solver but results were so bad... Does anyone know why is that? (...)
Electromagnetic Design and Simulation :: 04-21-2008 12:09 :: andrewmorcos :: Replies: 0 :: Views: 738
I am searching for a reference for
Finite difference frequency domain in non homogeneous mediacan anybody help me??
Electromagnetic Design and Simulation :: 05-12-2008 00:07 :: meisam haghparast :: Replies: 0 :: Views: 773
I have to write this function:
in the frequency domain. w and x are vectors but they haven't the same length. I have to make a convolution between w and x and I think I have to use the funcction freqz but it doesn't work...
Can you help me?
Digital Signal Processing :: 06-01-2008 06:01 :: nature.boy :: Replies: 3 :: Views: 4448
the inputting of the IFFT in OFDM should be the frequency domain point. which is the mapping of the constellation such as QAM or QPSK. but the vector in the consellation is just complex.why some book call this vector frequency domain point? such as 3-3j in conselation,it shoud be time domain signal,why is (...)
Digital communication :: 06-24-2008 11:26 :: richardhuang :: Replies: 4 :: Views: 1745
Presence of a pole makes the gain to roll-off (falls) @ 20db/decade. If a pole is present at origin, the gain plot begins with 20db/dec roll-off. If there r 2 poles at the same point, gain rolls-off @ 40db/dec and so on. Presence of a zero increases the gain @ 20dB/decade.
A pole also causes a phase shift of -90deg. A zero cause
Analog Circuit Design :: 10-16-2008 01:26 :: cinch :: Replies: 4 :: Views: 2312
I am trying to simulate a SC-frequency domain LMS equalizer.
Now since it is SC the detection has to be in time domain although the
channel estimation is in frequency domain so i follow these steps
1) Multiply data -> data_f (in frequency domain) with weights (...)
Digital Signal Processing :: 01-09-2009 01:06 :: kel8157 :: Replies: 1 :: Views: 1248
I've been trying to understand more on frequency plots of images.
1. Assuming a 1d example of just a strip of an image; in the frequency map there are 'same' no. of frequencies as there are pixels. What is the reason for this? Does this have something to do with the Nyquist theorom.
2. What you see in the frequency (...)
Digital Signal Processing :: 01-29-2009 20:43 :: ndesk1900 :: Replies: 1 :: Views: 777
I think, because if you know frequency response of the system, you can easily predict its response in time domain for any type of input signal. (And vice-versa as well). Another reason could be well known technique of determining system stability based on frequency response.
Digital Signal Processing :: 02-09-2009 10:30 :: nl5 :: Replies: 4 :: Views: 2496
I experimented with your free-space dipole problem a little bit.
When I refined the mesh (transient solver) somewhat, the results (S1,1) of the two solvers got closer. I get about a 0.5 db difference with about 4 or 5% frequency shift.
I also get about this much frequency shift when I compare the two solvers using CST's dipol
Electromagnetic Design and Simulation :: 04-09-2009 17:39 :: jpsmith123 :: Replies: 5 :: Views: 3786
I am looking for the book;
frequency-domain Characterization of Power Distribution Network
Author; Istvan Novak & Jason R. Miller
Can anyone help?
Electromagnetic Design and Simulation :: 04-26-2009 21:41 :: magneto_cool :: Replies: 0 :: Views: 1004
whan I simulat an array structure by CST the results confuse me because the reflection phase diagram using time domain solver (!T) and frequency domain solver (!F) is quite different. (Why?)
I know the results of (!T) is TEM and the results of (!F) is TE and TM is any way exist to find reflection phase by (!F) for TEM?
Electromagnetic Design and Simulation :: 05-10-2009 05:26 :: mirshahram :: Replies: 0 :: Views: 1439