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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
Hello all, 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!! Thanks
Hi, 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? Thanks
HI guys, 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
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 (...)
Phase noise and AM noise measurement in the frequency domain
No. FDTD is time domain method, FDFD is frequency domain method and is meaningful different particurarly about computational solution. Best regards
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
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 (...)
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 (...)
The spectrum of a AM or FM signal show both positive and negative part of frequency domain. Why is that? Isnt' the positive part sufficient?
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 (...)
hi! 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????????????
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.
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
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 (...)
hi, 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 (...)
Hi, A good article on understanding DSP's frequency domain
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 (...)
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.
Hi 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. Thanks. Excuseme the site for download the paper is
Hi all, 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!
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) .
Which signal appears same in frequency domain and timedomain
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? Regards M
Can any one refer some material on the frequency domain Equilizers (FDE) ???? Waiting...... BR
hello what does a rectifier do in frequency domain? is it true if we say "it multiple frequency by 2?
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. THANK YOU
Hi friends, 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 (...)
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 2)Applying modulation 3)Applying IFFT Where the (...)
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.
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 with regards
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?
Hello, 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 (...)
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.
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?
Can anybody explain or help by sending relevant paper that how using walsh transform i am shifting from time domain to frequency domain. Thnx, Regards swagata
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! Clara
Hello everybody, can anyone help me in understanding pass band signal and their representation in frequency domain. waiting anxiously for help......... Regards, vini
Hey there, 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? (...)
hi I am searching for a reference for Finite difference frequency domain in non homogeneous mediacan anybody help me??
Hello, I have to write this function: y=filter(w,1,x) 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? Thanks
well it is just a traditional reason...nothing OFDM consider FFT and IFFT as filtering.. The real channel effect is appeared in time domain(such as multipath channel delay "assuming" transmit data are in frequency domain, perform the IFFT to get "time domain" signal to be transmitted to physical channel....that's it..
frequency domain: 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
Hi All, 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 (...)
Hi, 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 (...)
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.
Dear friends, I was comparing the time and frequency domain solver in CST MWS 2009 for the accuracy of the results and I found that the results in both of the solvers are very different. I've been reading about these solvers and everywhere they are showing nearly identical results so I am curious why my results are not matching. I use time (...)
Hi, I am looking for the book; frequency-domain Characterization of Power Distribution Network Author; Istvan Novak & Jason R. Miller ISBN:13:978-1-59693-200-5 Can anyone help?
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?