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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. ...

Need help on LMS based equalizer for GSM

Hi all, I am doing GSM software defined radio and trying to use normalized LMS algorithm to implement an equalizer, since LMS has low complexity. But now I find that the BER is not improved at all after adding the equalizer block. I just simply take the normalized LMS algorithm and use it, and...

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 ...

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 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...

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 ...

Parametric equalizer

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...

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! ...

MLSE equalizer for optical communication

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 resou...

Equalizer and Timing recovery

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 don...

Re: Improve SNR via DSP

.. and looking at it on a broader scope, since you control both transmitter and receiver: What you've got could be considered an infinite training sequence for an equalizer. Again, looking it up from Proakis (Adaptive Equalization / the LMS criterion), Fig. 11.1-2 shows a "linear adaptive equaliz...

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? ...

Re: Design of multirate filters

On Feb 25, 5:27=A0am, "jbdore" wrote: > Do you perform an equalization on the data before plotting the > constellation? > > JB. @JB yes of course JB. do you think that filter imperfections should be handled by equalizer and i should look into equalizer algorithm? on baseband simulatio...

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...

Delay estimation

Hello All, There is a communication channel with nonminimum phase response. The channel could be described as H(s)=P(s)/Q(s). The channel is equalized by a linear equalizer. The equalization is near perfect but there is a delay lag in the (equalizer + channel) due to the nonminimum phase pa...

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. ...

LMS for co-channel Interference supression

Hi There is a old topic called "LMS implementatiom for echo cancelation ad co-channel interference supression" which says we can use LMS to suppress co-channel interference. I agree adaptive Equalizer helps against co-channel interference. But I don't agree regarding NTSC interference in ATSC....

Timing adjustment and equalizer in a modem

Hi all, I have a question on timing adjustment and equalizers, and in my case the application is for a simple low speed PSK modem. I am using a half-symbol spaced passband complex equalizer, so basically we are pumping samples at B/2 (B is the baud rate). There is no preceeding interpolator, a...

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...

A que on LMS vs NLSM

Hi All It is known from the books that NLMS is better than LMS when the dynamic range of the input signal to the equalizer is large. But if we use an AGC before the equalizer and then use LMS to adapt the taps, what would be the performance compared to NLMS? Best Regards Chintan ...

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...

relation of equalizer and channel coding

Hello, Well known that decision-feedback equalizer is generally superior than linear equalizer, I was surprised to read the statement in a paper: "Finally it is to mention that a combination of channel coding (Viterbi Decoding) and DFE did not lead to a performance gain compared to channel cod...

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 ...