## Forums Search for: Equalizer

## mp3 equalizer

inHello I am a new engineer in the DSP field. I have to implement an equalizer for our mp3 decoder. The equalizer must include 4 modes, which is...

Hello I am a new engineer in the DSP field. I have to implement an equalizer for our mp3 decoder. The equalizer must include 4 modes, which is pop, rock, classic and jazz. The equalizer and mp3 decoder are implemented using ADI-2181 DSP. Would you please tell me where to find the information about the 4 kinds of equalizer? Thanks in advance. Sherwin

## LMMSE (non-adaptive) equalizer and LMS equalizer

inHi, If we compare LMMSE (non-adaptive) equalizer and LMS adaptive equalizer in time-invariant channel, which equalizer should achieve better...

Hi, If we compare LMMSE (non-adaptive) equalizer and LMS adaptive equalizer in time-invariant channel, which equalizer should achieve better performance in terms of MMSE and BER? Why? Thanks.

## Parametric equalizer

inI have never had a graphic equalizer on my home stereo system, and never missed one. I now saw an article referencing an article by Bob Pease...

I have never had a graphic equalizer on my home stereo system, and never missed one. I now saw an article referencing an article by Bob Pease (a name that should sound familiar to some here): http://electronicdesign.com/article/analog-and-mixed-signal/what_s_all_this_absurd_filter_stuff_ anyhow.aspx reminding me of the Parametric equalizer. With a graphic equalizer, you have some number

## One Tap Equalizer in OFDM

inhi all, Generally i have coded my OFDM system, but i have some problem in understanding about the one tap equalizer. Actually i know how to...

hi all, Generally i have coded my OFDM system, but i have some problem in understanding about the one tap equalizer. Actually i know how to generate a ZF equalizer , but i would like to know how to generate MMSE equalizer, even i have the algorithm , but i dont understand the symbol stand for,hence i cant code in matlab Г=E[||X||]^2 G= [Г^0.5 * conj(H)] / Г||H||^2+ &

## Using Least Mean Squares equalizer

inHi all, I am new to signal processing; In my application, I need to use an adaptive LMS equalizer. I have some doubts regarding that. I...

Hi all, I am new to signal processing; In my application, I need to use an adaptive LMS equalizer. I have some doubts regarding that. I can model my scenario as a signal x[n] passing through a channel with a transfer function H(z) and output Y(z)=H(z)X(z)+N(z), where N(z) is an additive noise (which can be filtered). Now I need to design an equalizer so that the effect of H(z) can be n...

## tuning a parametric equalizer

inHello. I'm trying to create a multiband parametric equalizer in software, but I'm unsure of how to tune the equalizer bands. I've only...

Hello. I'm trying to create a multiband parametric equalizer in software, but I'm unsure of how to tune the equalizer bands. I've only recently started learning DSP, but I've studied the DFT/FFT and basic IIR filters like low pass, high pass, and band pass... My original idea was to use a FFT for the equalizer, but I quickly learned that IIR is the way to go. It seems pretty simple t...

## Question on fractionally spaced equalizer.

Hi there, I am working with T/2 fractionally spaced equalizer. Here is what I am thinking about the problem. Suppose my even phase channel...

Hi there, I am working with T/2 fractionally spaced equalizer. Here is what I am thinking about the problem. Suppose my even phase channel is h_e[n] of 10 taps and my odd phase channel is h_o[n] of 10 taps as well. Then, my even phase equalizer is g_e[n] of, let's say, 20 taps and my odd phase equalizer is g_o[n] of 20 taps as well. For simplicity, let's say the equalizer g_...

## Equalizer and Timing recovery

inHi, First question: I wonder if I should place the equalizer before or after the Gardner Timing Recovery loop. It is about a BPSK/QPSK...

Hi, First question: I wonder if I should place the equalizer before or after the Gardner Timing Recovery loop. It is about a BPSK/QPSK digital demod. If the equalizer goes before the TED, it should works at 2 samples/ symbol and after it can works at 1 sample by symbol. All this will be done before carrier recovery. I guess if I do the equalizer before it will help the TED to lock and h...

## Fractionally spaced equalizer

inIs fractionally spaced equalizer (FSE) applicable to the linear adaptive transversal filter? I noticed that most of the FSE is applied for...

Is fractionally spaced equalizer (FSE) applicable to the linear adaptive transversal filter? I noticed that most of the FSE is applied for the decision feedback equalizer (non-linear). May I know what are the advantages of using FSE over symbol spaced equalizer? Thanks.

## Equalizer - How to do?

inHi all, I want to find a way to do the "Equalizer" (similar to equipment on audio amplifier) using software (maybe C or others) on PC, should...

Hi all, I want to find a way to do the "Equalizer" (similar to equipment on audio amplifier) using software (maybe C or others) on PC, should I use the filter bank technique? Or can I simply use FFT and just change amplitude of frequency components, then take inverse FFT? Is there open source or on-line guide for implementing a equalizer? Any suggestion are appreciated, thanks in advance...

## Adaptive Algorithm for Zero Forcing Equalizer

inHello, 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 ...

## equalizer

inHi, How do I choose number of taps in an equalizer?? does it depends on number of multipaths??? Is the signal delayed deliberatey in the...

Hi, How do I choose number of taps in an equalizer?? does it depends on number of multipaths??? Is the signal delayed deliberatey in the equalizer or its the signal delayed in the channel with some delay spread??? Am quite confused. Can someone quote me a good E-source on equalizers????? kind regards

## Equalizer / Adaptive filter and VLSI implementation

Hi all, I am new to equalizer and adaptive filter. My tutor told me to minimize a DFE(decision feedback equalizer)'s area while keep its...

Hi all, I am new to equalizer and adaptive filter. My tutor told me to minimize a DFE(decision feedback equalizer)'s area while keep its timing. I got a book named "Pipelined Adaptive Digital Filters" by Parhi. But the book seems aim at high speed. Can you recommend some book or paper on this subject? And is there any available C or Matlab code on DFE(decision feedback equalizer)? ...

## symmetric matrix inversion problems

inI'm studying for a final in a wireless communications class, and one of the topics we're expected to be able to work is the calculation of the...

I'm studying for a final in a wireless communications class, and one of the topics we're expected to be able to work is the calculation of the minimum mean squared error (MMSE) for an adaptive equalizer, given a certain input vector and equalizer filter structure. In the class examples we've done so far, the equalizer is always a two-tap finite impulse response filter, which gives rise to an...

## MMSE equalizer

From literature study, I noticed that MMSE equalizer (non-adaptive type)has been used to equalize the multipath effect in time-varying channel....

From literature study, I noticed that MMSE equalizer (non-adaptive type)has been used to equalize the multipath effect in time-varying channel. May I know how these simulation are conducted since the channel is time varying while there is no adaptation mechanism for the equalizer? Please help. Thanks.

## Fractionally Spaced Equalizer

inHi there, Is there anyone know how I can convert the coefficients of Fractionally-Spaced-Equalizer to the coefficients of...

Hi there, Is there anyone know how I can convert the coefficients of Fractionally-Spaced-Equalizer to the coefficients of Symbol-Spaced Equalizer? I know it can't be done by downsampling the output of this filter fed by Impulse input!

## MLSE equalizer for optical communication

inHi, I want to do simulation on MLSE equalizer for optical QPSK/DQPSK signal first then i will go for experiment. I need Matlab file for that. I...

Hi, I want to do simulation on MLSE equalizer for optical QPSK/DQPSK signal first then i will go for experiment. I need Matlab file for that. I have read some recent papers on that but i dont understand the basic things of MLSE clearly for optical communication. Can anyone provide me any resources on MLSE equalizer. i really appreciate your help. BR// Zaman

## Pre_equalization with FSE

Hi there, I've already use the Fractionally_Spaced-Equalizer at the receiver. I'm trying to send the coefficient of this equalizer to the...

Hi there, I've already use the Fractionally_Spaced-Equalizer at the receiver. I'm trying to send the coefficient of this equalizer to the transmitter to have a echo free signals at the receiver. I can get the good result when I use the symbol spaced equalizer but when I use FSE after upsampler and before pulse shaping filter at the transmitter I can't get the good result. I just convolve the upsa...

## estimation of SNR using MEDLEY

inhi, i am fresh in the field of ADSL/ADSL2 modems. our system has 2-stage equalization - Time-domain equalizer for reducing ISI to within the...

hi, i am fresh in the field of ADSL/ADSL2 modems. our system has 2-stage equalization - Time-domain equalizer for reducing ISI to within the cyclic prefix, and Frequency-domain equalizer which is a 1-tap equalizer to undo the channel. for training the TEQ, a signal called REVERB is used, a psuedo-random signal which is identical from one symbol to the next. for training the FEQ and estimating...

## zero-forcing equalizer statement in Sklar

inI'm reading about the zero-forcing equalizer solution for ISI in [sklar], p. 155, where he says, For such an equalizer with finite length,...

I'm reading about the zero-forcing equalizer solution for ISI in [sklar], p. 155, where he says, For such an equalizer with finite length, the peak distortion is guaranteed to be minimized only if the eye pattern is initially open. Huh? I thought the whole idea of ZFE is to open up the eye pattern! This makes no sense to me. Perhaps what they are trying to say is that, if the "mem...