Dear All I am trying to plot histogram of the o/p of equalizer. As the o/p is complex I will have to plot histogram of real and imaginary...

Dear All I am trying to plot histogram of the o/p of equalizer. As the o/p is complex I will have to plot histogram of real and imaginary part separately. I know it is straight forward in matlab, but the problem is how to normalize y-axis. The modulation I am using is 4-QAM. As this will be bimodal distribution around +1 and -1, I am thinking to do following: 1. find std deviation (\sigma...

hi, This is my first filter implementation and is made in Scilab, also the design of the 3ord Chebyshev Type I IIR Filter (with the iir...

hi, This is my first filter implementation and is made in Scilab, also the design of the 3ord Chebyshev Type I IIR Filter (with the iir function). I actually have 3 filters, so i can use them as an equalizer for an audio application. I´m using Direct Form I Realization. Since I have to implement this on a 24bit Fixed-Point DSP I had to scale my coefficients by a factor of 256 (same as shifting...

I just got a new set of 2.1 speaker for my PC for christmas, my main problem with it is that it outputs a very altered sound, mostly the bass,...

I just got a new set of 2.1 speaker for my PC for christmas, my main problem with it is that it outputs a very altered sound, mostly the bass, they are way too loud. I firstly thought it would be easy fixing that with some software equalizer but no, the sound is still very weird. I thought about playing a delta function through my speakers and record it with a microphone to look at the fre...

How are filters that have their cutoff and e.g. Q variable (such as in a typical parametric equalizer) done? Does this mean that the filter...

How are filters that have their cutoff and e.g. Q variable (such as in a typical parametric equalizer) done? Does this mean that the filter coefficients are recalculated (i.e. the filter is redesigned) every time the parameters are changed? What kind of other design considerations are involved (such as computational efficiency)? What about "smooth parameter changes", is it interpolation (and...

Does anyone do a s/w 3rd octave equalizer that will work on a stereo (non dolby etc) SPDIF output (from a mobo or soundcard)? --...

Does anyone do a s/w 3rd octave equalizer that will work on a stereo (non dolby etc) SPDIF output (from a mobo or soundcard)? -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.theconsensus.org/ - A UK political party http://www.blogtalkradio.com/onetribe - Occult Talk Show

Hi guys, I was doing the simulations for the multitap frequency domain equalization for multicarrier system (DMT based). It seems though...

Hi guys, I was doing the simulations for the multitap frequency domain equalization for multicarrier system (DMT based). It seems though the at the band edges (First few tones and last few tones) higher performance can be achieved if we use higher number of equalizer taps. Can you people please suggest me any reasons why that happens or at least guide me to any publication that might hel...

Hi guys, I'm currently doing my literature review on both types of equalization. Based on what I understand, both have comparable performance...

Hi guys, I'm currently doing my literature review on both types of equalization. Based on what I understand, both have comparable performance but use different approach; MLSE: sequence detection while MAP symbol by symbol detection. Since both relatively similar, how can we choose which type of equalizer is suitable to combat ISI? Responds pointing to publications and articles are very much ...

Would some one be able to suggest a good tutorial or explanation of a general implementation for a 4 or 8 state MLSE equalizer for GSM ?...

Would some one be able to suggest a good tutorial or explanation of a general implementation for a 4 or 8 state MLSE equalizer for GSM ? I understand the theory, but would like an explanation of how, for a specific case/example, locations on a constellation are assigned to states and the best way to compute metrics. Preferably, something with illustrations/trellis diagrams would be nice. Thank you...

How much benefit can adaptive equalization really get you in a packet transmission system over multipath channel? Since one will need to...

How much benefit can adaptive equalization really get you in a packet transmission system over multipath channel? Since one will need to do synchronization before training the equalizer, it seems to me that synch will be the first one to fail most of the time if ISI is really serious. So that means you must have a synchronization scheme that can deal with serious ISI first. Or you will have to...

Hi, I have a general about the usage of equalization for non-coherent systems. I'm considering Differential PSK for a single carrier SISO...

Hi, I have a general about the usage of equalization for non-coherent systems. I'm considering Differential PSK for a single carrier SISO system. I consider different channels with different no., of taps. But I'm not sure what type of equalizer should be used for a such a system. Thanks. _____________________________ Posted through www.DSPRelated.com

Hi, I am doing my study on graphic and parametric equalizers. I read through some of the previous posts on this site and was really helpful....

Hi, I am doing my study on graphic and parametric equalizers. I read through some of the previous posts on this site and was really helpful. I have one small question though. When I am presented with a stereo audio signal, would it be advisable for me to process the two channels using two separate IIR filter bands? Or just assuming the data to be continuous, can I just use one filter? Th...

Hi everyone, I am experimenting with some equalization schemes and to judge the performance, I need to estimate the eigenvalue spread of the...

Hi everyone, I am experimenting with some equalization schemes and to judge the performance, I need to estimate the eigenvalue spread of the input to the equalizer. Currently I am working with a single input stream of many thousands of samples, and I am assuming that my data is more or less uniformly distributed. To get the eigenvalues, I generate R = Sum( x[k]*x[k]T) where x[k] is a vector...

Hi, I would like to design use an equalizer for improving the performance of 4fsk-frequency hopping system in rayleigh fading, I ve seen...

Hi, I would like to design use an equalizer for improving the performance of 4fsk-frequency hopping system in rayleigh fading, I ve seen matlab functions but they all are for linear modulations or is there any function for non linear modulations??. Can any one please guide me on this issue? Is there any particular technique that is useful for this case?? thanks

I'm looking for some inspiration on the following problem: I want to transmit a signal consisting of 8 QPSK-Modulated carriers over a coaxial...

I'm looking for some inspiration on the following problem: I want to transmit a signal consisting of 8 QPSK-Modulated carriers over a coaxial cable, in the frequency range of 1 to 10 MHz. Since the cable has a frequency-dependent attenuation (e.g. 1dB/100m@1MHz, 3dB/ 100m@10 MHz), I need to somehow compensate for this at the receiver before it is forwarded to an optical transmitter. Sinc...

I am trying to build a 'non-continuous' 12-tap FFE (LMS Blind) equalizer in software, hoping to remove to some extent group delay in a satellite...

I am trying to build a 'non-continuous' 12-tap FFE (LMS Blind) equalizer in software, hoping to remove to some extent group delay in a satellite link. I am doing in software, as I am ONLY keen to know the SNR after equalization. The reading are in chunks of 512 x I/Q samples. Technically, does this even work, due to the fact that it is non-continuous. I do not need a perfect system, just some ...

Hi all, Can anybody provide me a fixed-point implementation (matlab, c/c+ +,... ) of the MMSE equalizer? Thanks

Hi all, Can anybody provide me a fixed-point implementation (matlab, c/c+ +,... ) of the MMSE equalizer? Thanks

Hi there, I'm trying to make a simple parametrical equalizer using the Audio-eq-cookbook (like everyone else :-)). I use it on audio signal...

Hi there, I'm trying to make a simple parametrical equalizer using the Audio-eq-cookbook (like everyone else :-)). I use it on audio signal and need to visualise resulting frequency response. E.g. peak filter should be painted as a hat-style curve. The problem is, that when I use the attached transport function H(z) the result is pretty different. It seems, that it modifies even frequencies it sh...

It seems that the training symbols have to use the same modulation as the data symbols. Is there any way that I can use different modulations? ...

It seems that the training symbols have to use the same modulation as the data symbols. Is there any way that I can use different modulations? say QPSK for training and 16QAM for data. I tried equalizing the two parts separately with a constellation change in between. The shape of the equalized constellation seems correct, but it is compressed. Of course the demodulation result is wrong. ...

Hi, I'm trying to equalize a channel with sever multipath using a DFE (12,12) with LMS adaption algorithm. The relative power of the replicas...

Hi, I'm trying to equalize a channel with sever multipath using a DFE (12,12) with LMS adaption algorithm. The relative power of the replicas are quite high w.r.t the main path. (max -4 dB). The equalizer is catastrophic. From the learning curve analysis I can observe that the error is still high after processing the training sequence. Morover, the forward filter coefficients are very small ...

Hi all, Thanks for all who replied to "Typical error level in RF systems". Based on that thread I started from scratch a *simple* I/Q...

Hi all, Thanks for all who replied to "Typical error level in RF systems". Based on that thread I started from scratch a *simple* I/Q transceiver in Simulink and I am not able to get more than about -41 dB NMSE. Ridiculous. If I add the proposed equalizer (numer of taps doesn't matter) I can get up to -47 dB. Not great either. The model is very easy: http://snag.gy/6aXXm.jpg A 20 MH...