Question about Reed-Solomon error control code

Started by Anonymous in comp.dsp16 years ago 2 replies

Hi, I am simulating equalizer with Reed-Solomon channel code a frequency fading channel. The fading channel has a severe spectral null, I...

Hi, I am simulating equalizer with Reed-Solomon channel code a frequency fading channel. The fading channel has a severe spectral null, I use frequecy domain equalization to contre the null. At present I think the equalizer works well. When I add the RS(170,180) (8 bit) channel code for a data frame, I find the BER performance is not improved at all. It is even worse a little bit than that o...


channel equalizer using rls algorithm

Started by Thiruppa in comp.dsp13 years ago 3 replies

hi i need help to do rls algorithm in matlab-- i have to do channel equalizer for given channel response --using rls algorithm ...

hi i need help to do rls algorithm in matlab-- i have to do channel equalizer for given channel response --using rls algorithm h(z)=1/1+0.8(1/z) no of tabs 2,4 (various updation co -effi) calculate minimum error and convergence time -plz help --i need to know no of tabs and convergence time plz give solution for this -which material w...


Derive closed form solution for a receiver

Started by cpshah99 in comp.dsp11 years ago 7 replies

Hi All I have simulated a performance of the receiver for time varying frequency selective channel. I am using adaptive equalizer to combat...

Hi All I have simulated a performance of the receiver for time varying frequency selective channel. I am using adaptive equalizer to combat multipath. What I would like to do is to derive closed form solution such as lower/upper bound or exact solution for BER. However, there are many variables: time varying channel, no channel state information at the receiver, adaptive equalizer and cha...


Parametric FIR audio equalizer

Started by Roman Rumian in comp.dsp17 years ago 33 replies

Hello, maybe my question is stupid, but does such a device/algorithm exist in practice ? Regards Roman Rumian

Hello, maybe my question is stupid, but does such a device/algorithm exist in practice ? Regards Roman Rumian


equalizer

Started by srikoll in comp.dsp18 years ago 3 replies

hi all, My question is about equalizers. Correct me if Iam wrong. "Equalizers are used only in Frequency domain." thanx.

hi all, My question is about equalizers. Correct me if Iam wrong. "Equalizers are used only in Frequency domain." thanx.


cma equalizer and cpbfsk

Started by Fredrik in comp.dsp15 years ago 2 replies

Hi! Will a constant modulus algorithm work for a cpbfsk signal even it's not i.i.d (independent identically distributed) ? Thanks

Hi! Will a constant modulus algorithm work for a cpbfsk signal even it's not i.i.d (independent identically distributed) ? Thanks


magnitude response

Started by Tom in comp.dsp14 years ago 2 replies

How can we compute the magnitude response of a complex equalizer (CE) after convergence ? There is 4 fir filters in a CE ! Thanks Tom

How can we compute the magnitude response of a complex equalizer (CE) after convergence ? There is 4 fir filters in a CE ! Thanks Tom


Third Octave Equalizer

Started by Dirk Bruere at NeoPax in comp.dsp14 years ago 4 replies

Does anyone do one of these that will run standalone on a PC? I need one that will fit itself between the output data stream and whatever is...

Does anyone do one of these that will run standalone on a PC? I need one that will fit itself between the output data stream and whatever is creating the audio stream, whether WMP, RealPlayer, WinAmp etc There doesn't appear to be anything that can do this. Is it even possible? I'm even willing to pay a fair amount of money for such a product. -- Dirk http://www.onetribe.me.uk - Th...


CMA cost surface plotting

Started by muxcontrol in comp.dsp14 years ago 5 replies

hello! Could some please tell me how to generate 3D CMA cost surface plots in Matlab for a 2-tap BPSK Equalizer? Any help is greatly...

hello! Could some please tell me how to generate 3D CMA cost surface plots in Matlab for a 2-tap BPSK Equalizer? Any help is greatly appreciated!


BPSK receiver

Started by rider in comp.dsp17 years ago 3 replies

Hi! For an all digital BPSK receiver, If I place the Equalizer in baseband, then what could be its exactloaction: Is the...

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)---> |DEMOD|----| MF |---/---| EQUZ |---|SLICER |---> ------ ------ ^ --- |- -----


improving an lms filter

Started by mk in comp.dsp16 years ago 2 replies

hi, I have an adaptive equalizer which implements a dfe which works reasonably well but I am trying to reduce the excess MSE after convergence....

hi, I have an adaptive equalizer which implements a dfe which works reasonably well but I am trying to reduce the excess MSE after convergence. What changes can I make by throwing in some more hardware at it to get slightly lower MSE ? I am afraid I can afford only 2x~3x more multipliers only. Any hope ? I am trying to keep my convergence rate constant. Thanks.


Behind-the-scenes software equalizer

Started by Anonymous in comp.dsp16 years ago 18 replies

Hello, I recently pulled a pair of old stereo speakers out of my basement to use with my PC. The only markings that might identify them I can...

Hello, I recently pulled a pair of old stereo speakers out of my basement to use with my PC. The only markings that might identify them I can find on them are "MLI 691H Hi-Fi Sound Monitor" Anyways, they don't really have that great of a sound quality, and I was wondering if there are any software equalizers out there that would allow me to tweak various frequencies. I was hoping this ...


multi-band equalizer

Started by WYChen in comp.dsp17 years ago 6 replies

For CD signals (sampling rate 44100Hz), Butterworth method is applied to design 10 bandpass filters. Center frequencies of these 10 bands are:...

For CD signals (sampling rate 44100Hz), Butterworth method is applied to design 10 bandpass filters. Center frequencies of these 10 bands are: 31, 63, 125, 250, 500, 1K, 2K, 4K, 8K, 16KHz, respectively. As weighting values (0.5, 0.5, 0.5, 0.8, 1.1, 1.3, 1.6, 1.6, 1.6, 1.6) are set to these corresponding 10 badns, the "Full Treble" style of music is achieved. It seems that the function of "Ful...


Re: OT The "parallel generators" conundrum

Started by Jerry Avins in comp.dsp10 years ago 6 replies

That's not what he did. By running the load current -- not the individual dynamo currents -- through the compounding coils on all the dynamos,...

That's not what he did. By running the load current -- not the individual dynamo currents -- through the compounding coils on all the dynamos, whether in service or not, the powerhouse can have the necessary negative resistance characteristic while the individual dynamos can behave as if they were uncompounded. The scheme uses an "equalizer bus". Pure genius! Jerry


DSP starter - need help

Started by djordj in comp.dsp17 years ago 1 reply

I'd like to build a DSP based audio equalizer. I usually program 8051-based micro at work so I have some basic about it. I'm looking for a...

I'd like to build a DSP based audio equalizer. I usually program 8051-based micro at work so I have some basic about it. I'm looking for a low-cost development tool that allows debugging/emulating the DSP based device. Thanks a lot.


Digital Filtering implementation

Started by DSP_newbie in comp.dsp16 years ago 2 replies

Hi pals ! Jere i am with a maybe very stupid question: I want to code a real time, equalizer (let's say 10th bands) followed by a crossover...

Hi pals ! Jere i am with a maybe very stupid question: I want to code a real time, equalizer (let's say 10th bands) followed by a crossover filter, in a digital way. So.. after having thought a while... i could consider two way to implement it : * The first, the "conventionnal way" : usinf normal IIR or FIR filters, to construct the EQ and Xover. this solution will lead to low delay an...


ML equalizer

Started by sair...@gmail.com in comp.dsp15 years ago

Hi, I am working on equalization schemes without using Viterbi type of algorithms. Assume that complexity is not an issue. I am trying...

Hi, I am working on equalization schemes without using Viterbi type of algorithms. Assume that complexity is not an issue. I am trying to detect the received samples using ML equation. Mathematically , if a1, a2, a3 .. aN are the input symbols, say h1, h2, h3 are the channel tap gains. Then the received signal is represented in vector fom as R= A*h+n, where R is the received vector...


Bidirectional equalization

Started by alberto.fuggetta in comp.dsp11 years ago 3 replies

Hello, I'm simulating a Decision Feedback Equalizer for MSK signal, using the well know LMS algorithm. In order to get better performance I...

Hello, I'm simulating a Decision Feedback Equalizer for MSK signal, using the well know LMS algorithm. In order to get better performance I tried to equalize each packet in two stages. The structure of the packet is as follows: [Payload1 TrainingSeq Payload2] Since the training sequence is placed in the middle (GSM like), I'd like to equalize the second part in forward direction and the firs...


How are variable filters implemented?

Started by Matti Viljamaa in comp.dsp5 years ago 52 replies

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...


Normalizing Histogram

Started by cpshah99 in comp.dsp12 years ago 3 replies

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...