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mp3 equalizer

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 a...

LMMSE (non-adaptive) equalizer and LMS equalizer

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. ...

Wiener Hopf Equalizer delay

CONTEXT:********************** Transmit x(n) receive y(n). Wiener-Hopf (MMSE) FIR Equalizer is... w = inv(Ryy)rxy where Ryy is the received signal autocorrelation and rxy is the channel input-output crosscorrelation: rxy(k) = E(x(n-D)y(n+k)). The D is a delay parameter chosen to make sure the...

Adaptive Algorithm for Zero Forcing Equalizer

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 a...

Fractionally spaced equalizer

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?

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 ...

equalizer

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????? kin...

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 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 ...

One Tap Equalizer in OFDM

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,...

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. 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. ...

Fractionally Spaced Equalizer

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! ...

Audio equalizer!

Hi, Greeting, I am interesting with a fully digital audio equalizer. For I am a fresh in this field, I don't how to start. Does somebody can tell me how to get/find a useful information? Thx ...

Graphic Equalizer

I want to implement a graphic equalizer in S/W. I assume it is a bunch of bandpass filters with boost/cut at their respective frequencies. Has anyone else done this or know of any links? ...

a question about map equalizer

A question puzzled me for days, have to look for help here: > From the derivation of MLSE, a matched filter is obviously needed before the equalizer. Starting from continuous signal, the operation of matched filter and sampling is so natural. But so far as I read about MAP equalizer, I doubt ...

How to get the expected value of the transmitted signal?

Hi,all I would like to find the expected value of my OFDM transmitted signal. As Y= H*X + N Y= Received Signal , H = Channel , X= transmitted signal ,N=noise Since i need to generate a MMSE equalizer, i need to find the Expected value of X , in order to do the simulation. The algor...

interaction between bandpass equalizer and pll

Hi, When using the SG algorithm for equalizing, the error signal is computed at the end of the pll. My problem is that the pll cannot be locked before the channel is reasonably equalized. Thus, I have a "bootstrap" where the equalizer need phase information(from pll) and the pll need equalized sign...

interaction between bandpass equalizer and pll

Hi, When using the SG algorithm for equalizing, the error signal is computed at the end of the pll. My problem is that the pll cannot be locked before the channel is reasonably equalized. Thus, I have a "bootstrap" where the equalizer need phase information(from pll) and the pll need equalized sign...

non-integer fractionally spaced equalizer?

Hi everyone, I'm considering implementing a fractionally spaced equalizer and one question which has bugged me in the past is whether a non-integer, smaller than 2 fractional spacing would have any benefits (ie better equalization). Suppose the signal rate is 100 M bauds and the signal bandwidt...

timing recovery & equalizer latency

Hi, I have a fully digital receiver where timing recovery and equalizer are adding significant latency and I would like to try and reduce it as much as possible. The timing recovery is done with a fractional delay filter (a farrow type FIR filter) where only one fractional value which gets mul...

equalizer error bias

Hi, I have a channel with significant ISI with a 3 level (1,0,-1) transmission. The transmitted data and the receiver data after quantization have zero mean. The problem is that the error output of the equalizer after convergence is not zero mean even (it's slightly positive) though its varianc...

LMMSE equalizer

From some technical papers, I found out that non-adaptive MMSE block equalizer has been used to equalize for time-varying channels. Since adaptive algorithm (LMS, RLS,....) is not applied here, then how the researchers simulate for the BER performance? Can anyone please help? Thanks. ...

equalizer with different location of the main tap

Hi there, I simulate a system with upsampling 4 at the transmitter. Then, I use the equalizer and change the main tap. when I use different location for main tap, the amount of timing error the receiver can beer is different and depends on the location of the main tap. Now, I realize that the ...

T/2 -spaced FSE MMSE equalizer, with carrier offset

Hi, here I am now doing a project about T/2 -spaced FSE MMSE equalizer based on the stochastic gradient algorithm. I use training symbol method to update the coefficient. It seems working well in some channel distortion enviroment. However, when carrier offset exists, i.e. (the constellatio...

Equalizer

I have two complex signals (Input and output) of a channel I need to equalize. I can have 2 linear equalizers one for the real part and one for the imaginary and train them independently or I can use one complex equalizer and train it using the complex signal. My questions are which one is b...

Re: first tap of equalizer

> dear all, > > I was trying to implement constant modulus algorithm for blind channel > equalization. I found that the filter taps of the equalizer are modified > according to W(k+1)=W(k)+ mu * conj(x(k)) * e(k) > > where mu= adaptation size > W the filter taps. > x(k)= transmitted symbol...

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 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 ...

Matched filter and LMS equalizer

Hi, Is it possible for a LMS equalizer in multipath environment to achieve better BER performance as compared to matched filter in AWGN channel? ...

Parametric equalizer

Hi everybody, I am new in this group and I have a problem. I have a project that requires a parametric equalizer on TI C6713. Can anyone help me with this? I have a little experience with programming TI ( I have made my past projects with Motorola 56300). Do You have some links that can help ...

BPSK receiver

Hi! For an all digital BPSK receiver, If I place the Equalizer in baseband, then what could be its exactloaction: Is the following arrangement acceptable? |PASS-BAND|--------------BASE-BAND----------------------| fs ------ fs ------ fs fb ------ fb ------- r(nTs)---> |DEMO...

Re: Choose equalizer or channel coding?

> > mguo wrote: > > This is a very nice forum and a lot of knowledgeable people here. I have a > > question don't know if any experts can share some thoughts on. > > > > If you are using GMSK over a wireless channel, and if you can choose only > > one feature to improve your system sensi...

cma equalizer

hello,erevyone.Recently I have been designing a blind channel equalizer based on the Constant Modulus Alogrithm.But I have a question that I can't think over.The question is as follows: The alogrithm I use is below: y(k)=3D =A1=C6f(k)x(N-k); % f(k+1)=3Df(k)-mu*e(k)*x(k)...

Re: inverse filtering?

Hi, search for "Equalizer", there is plenty of material on the web. Simply inverting the filter as said is called "zero forcing equalizer" and usually it does NOT work. But building a correction filter that straightens out your PASSBAND may work very well. I've got example code here, for ...

adaptive precoding 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 ieee...

equalizer visualization tools in public domain

Are there any good c/c++ music (external mic input) equalizer and/or music visualization applications (with source code) in public domain? I am looking for some basic functionality as a starting point. Thanks, Ben ...

group delay equalizer

Hi, Matlab has a function called iirgrpdelay which helps in designing iir group delay equalizer filters. Any idea as to how this function can be re-written for people who are not using matlab? Bharat Pathak ...

ML equalizer lower bound

Hi, I would like to derive the ML equalizer lower bound for frequency selective fading channels , when the channel is modeled as FIR tapped delay line with complex Gaussin random variables as channel tap gains. I am not sure, whether there exisists a bound for this? Any help in this is ...

Does noise enhancement affect Bipolar/QPSK data (since only the sign counts)

(My question is at the bottom) ======= POST FROM STEFFEN LAST JULY ON COMP. DSP ====== Regarding the noise enhancement after applying the linear zero-forcing equalizer I've found some explanation in "digital communications, Proakis, 4.Ed, chap.10, p.621" :o). Proakis says:"...the performance...

ISI

Dear friends, As we all know inter symbol interference(ISI) is , by which the transmitted symbol smears or runs into the adjacent symbol. But, in one of the IEEE paper I have seen the mathemetical definition as ISI= sum(abs(h).^2)- max(abs(h).^2) / max(abs(h).^2) where h= conv(c,w) c =...

estimation of SNR using MEDLEY

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 psued...

TPS Decoding in DVB T/H

Hallo, everyone I have just decoded the TPS in DVB-T/H before and after the channel equaqlizer. The result by me shows, TPS Decoding before the channel eqalizer is more robust as after the Channel Equalizer even by TU-6 or AWGN channel. Can somebody tell me the reason? My Channel Equalizer ...