Hi. I am self-studying adaptive signal processing. I've read C.R. Johnson's Adaptive Signal Processing, and some parts of Haykin's. I am...

Hi. I am self-studying adaptive signal processing. I've read C.R. Johnson's Adaptive Signal Processing, and some parts of Haykin's. I am reading this paper "Self adaptive decision feedback equalization: Application to high order QAM signal" In the paper, adaptive whitening filter is applied to the received signal. The whitened signal is then fed to another adaptive FFE equalizer to recov...

I'm simulating an echo canceller in Matlab, using a FIR adaptive LMS filter. I'm using the standard noise cancelling approach: -adaptive filter...

I'm simulating an echo canceller in Matlab, using a FIR adaptive LMS filter. I'm using the standard noise cancelling approach: -adaptive filter input u(n) = far end speech -adaptive filter output is y(n) -impulse response of echo path is h(n) -near end speech is ne(n) -d(n) = ne(n) + u(n) (*) h(n) ----> where (*) denotes convolution -adaptive filter error single e(n) = d(n) - y(n) -In

I was trying to search through literature in order to find advantages and disadvantages of adaptive pre-coding and pre-equalization...

I was trying to search through literature in order to find advantages and disadvantages of adaptive pre-coding and pre-equalization over adaptive post-equalization. I failed. Can anyone point to a good reference. 2ndly on adaptive pre-equalization there are only three papers when we search ieeexplore. I was thinking of using indirect learning architechture as a pre-equalizer mentioned in D....

Hi I am working on a backward adaptive non-uniform quantizer for use in wireless transmissions. More precisely my quantizer currently consists...

Hi I am working on a backward adaptive non-uniform quantizer for use in wireless transmissions. More precisely my quantizer currently consists of an adaptive compader (currently atan-based) and a simple uniform quantizer. This works very well. Trouble is: I am going to transmit data over a noisy wireless channel. As of now the errors are bringing the adaptive expander on the decoder side ...

How does one maintain synchronization when one is using adaptive equalization? I'm currently working on a highly dispersive, varying channel,...

How does one maintain synchronization when one is using adaptive equalization? I'm currently working on a highly dispersive, varying channel, that needs adaptive equalization to work well. But I've come to realize that one thing that adaptive equalization adapts for is the exact timing of the signal. This means that you can't really used the output of the equalizer as a phase refere...

I am facing some issue with my echo cancellation module. I am having a correlator and an adaptive filter modules. My correlator will detect...

I am facing some issue with my echo cancellation module. I am having a correlator and an adaptive filter modules. My correlator will detect presence of echo in the DTMF tones and will activate the adaptive filter. The adaptive filter will remove the echo present in the DTMF tones. Activation of adaptive filter is done only if the correlation is above a certain threshold. My issue is t...

Hi All I am trying to demodulate real time data using adaptive DFE. The channel is highly time varying and the multipath spread is approx....

Hi All I am trying to demodulate real time data using adaptive DFE. The channel is highly time varying and the multipath spread is approx. 50 - 100 symbols at the data rate of 4ksps. I have 1000 symbols long training sequence. The problem is that adaptive DFE is not able to converge. The algorithms that I am using is LMS and NLMS. I have been palying with filter lengths and step sizes. I ...

I am working on project on Adaptive filter using TMSC6713. I have to calculate the snr ratio at the output.SO what i did is ,I gave only the...

I am working on project on Adaptive filter using TMSC6713. I have to calculate the snr ratio at the output.SO what i did is ,I gave only the speech signal to the adaptive filter and recorded the output,The second thing I did is I gave both speech signal and the wind noise to the adaptive filter and recorded the output. So now I have 2 signals. 1. Clear speech signal 2.Speech signal+noise(ve...

Hi I am using a classic nlms adaptive filter to minimize the error between an unknown LTI system and the output of an adaptive FIR. However I...

Hi I am using a classic nlms adaptive filter to minimize the error between an unknown LTI system and the output of an adaptive FIR. However I have no control over the stimulus, which is a mix of sinusoids that change slowly over time. I know that with this input, the filter may not adapt to the true impulse response, but as long as the error goes to a small value I don't really c

Hello, I'm taking an adaptive filter course, and have been given a desired signal and a distorted signal. The desired signal is...

Hello, I'm taking an adaptive filter course, and have been given a desired signal and a distorted signal. The desired signal is non-return-to- zero purely random binary data, i.e. -1, 1, 1, -1, 1, -1 etc. The distorted is this exact same signal, but filtered and added with noise. We are to filter the distorted signal using adaptive filter methods that we learned, namely steepest descent...

Hi, I'm looking for a good book on adaptive filtering, in the style of Richard Lyon's 'Understanding digital signal processing'. So far,...

Hi, I'm looking for a good book on adaptive filtering, in the style of Richard Lyon's 'Understanding digital signal processing'. So far, everything I've found involves quite complicated formulas straight from page 1, with very little clear and intuitive description of how this all works. Number one on this list would be 'Fundamental of Adaptive Filtering' by Sayed. I understand this book prob...

There is a book called "Fundamentals of Adaptive Filtering" By Ali Sayed that people say nice things about. There is also a new book by him,...

There is a book called "Fundamentals of Adaptive Filtering" By Ali Sayed that people say nice things about. There is also a new book by him, simply called "Adaptive Filters". Looking at the contents pages on Amazon it seems this new book must be an update of the old one, but there are somewhat less pages. Does anyone know the real relationship between these books?

Dear All, Recently I had posted a thread where I asked about SNR penalty due to linear interpolation. I managed to solve that problem but there...

Dear All, Recently I had posted a thread where I asked about SNR penalty due to linear interpolation. I managed to solve that problem but there are some more doubts. My receiver has adaptive doppler correction and adaptive DFE using LMS. Now, the filter update constants that I had kept intially are as follows: Training mode: mu1=0.01 -> for Feedforward filter mu2=0.003 -> for

Hi, As we know, DFE filter weights can be adaptive with LMS in an unknown channel. If the DFE weights have a constraint, i.e. its norm has...

Hi, As we know, DFE filter weights can be adaptive with LMS in an unknown channel. If the DFE weights have a constraint, i.e. its norm has the minimum, the DFE weights can still be adaptive? I think that the MSE of the norm constrained DFE is very complicated. It seems impossible to write a closed form gradient formular. Anyone can give me further information? Thanks

Hello dear dsp fellows, i want to identify an unknown acoustical transfer function using an adaptive LMS system identification set-up. Both the...

Hello dear dsp fellows, i want to identify an unknown acoustical transfer function using an adaptive LMS system identification set-up. Both the plant (the unknown acoustical transfer function ) and the model (coefficients of the adaptive filter) will be fed with the same excitation signal. The difference of their outputs will form the error, which will be fed to the LMS update formula. Now, as ...

Hello, Could you please give me an example of adaptive algorithm that can be used for a zero forcing equalizer. I am a bit confused. If I would...

Hello, Could you please give me an example of adaptive algorithm that can be used for a zero forcing equalizer. I am a bit confused. If I would like to use peak distortion as cost function, could I use LMS algorithm to make my equalizer adaptive??. -If yes, how? (Because the error fed to LMS algorithm is difference between equalizer output and desired signal. Then no difference remains with ...

I'm trying to simulate a adaptive beamformer. I refered to the block diagram of GSC in "adaptive filter theory" of S.Haykin,P.257.I'm a...

I'm trying to simulate a adaptive beamformer. I refered to the block diagram of GSC in "adaptive filter theory" of S.Haykin,P.257.I'm a little confused with the constraint matrix and quiescent weight vector. I'm wondering about how to built the signal-blocking matrix 'Ca' and how to determine the constraint matrix numerically. Any help is appreciated!

Hello group, I have been assigned a bachelor project (final thesis) and I'm looking for litterature for some particular subjects. Mainly, the...

Hello group, I have been assigned a bachelor project (final thesis) and I'm looking for litterature for some particular subjects. Mainly, the objective is to cancel noise using an adaptive filter. The system consists of two noise sources and one primary signal, in short, an adaptive MISO filter. I've googled for abstracts, litterature reference and for books at Amazon that describes such sys...

Hi all, we are doing a project on "Adaptive Filtering of Evoked Potentials". The thing is we wanted to implement the same in real time...

Hi all, we are doing a project on "Adaptive Filtering of Evoked Potentials". The thing is we wanted to implement the same in real time i.e get the evoked potentials data in real time and filter the noise using adaptive LMS algorithm. We are using the DSP processor from Texas Instruments "TMS320C54X" for this purpose. We are using the "Code composer" software where the C-code is conve...

hi everybody. I'm looking for one (or more) textbook on adaptive filter theory. I'm not interesting in advanced topics, I'm interesting in a...

hi everybody. I'm looking for one (or more) textbook on adaptive filter theory. I'm not interesting in advanced topics, I'm interesting in a well explained book able to drive the beginner inside the matter. a book with some examples or solved exercises would be appreciated. does anyone studied the subject on a such valuable book? e.g. I implemented some adaptive notch filters startin...