How to get the expected value of the transmitted signal?

Started by ericknightX in comp.dsp14 years ago 1 reply

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=...

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 algorithm of MMSE equalizer is Gmmse= Ru * Transpose(H) * inv(Rn+ H * Ru * Transpose(H)) Where Ru ...


questions about gmsk and equalizer

Started by zqchen in comp.dsp13 years ago 2 replies

1. Though dummy bits are assumed before and after tail bits, they are not actually transmitted on the air, are they? Then since the...

1. Though dummy bits are assumed before and after tail bits, they are not actually transmitted on the air, are they? Then since the gaussian pulse is assumed to last 4 bits, will the dummy bits lag into the tail bits in real signal? 2. If dummy bits are not transmitted, then how does the equalizer handle it if there are more taps than the number of tail bits? Thanks a lot!


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.dsp16 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.dsp17 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


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...


DSP starter - need help

Started by djordj in comp.dsp16 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.


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!


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.


magnitude response

Started by Tom in comp.dsp13 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


multi-band equalizer

Started by WYChen in comp.dsp16 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...


ISI

Started by aamer in comp.dsp14 years ago 9 replies

Dear friends, As we all know inter symbol interference(ISI) is , by which the transmitted symbol smears or runs into the adjacent symbol....

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 = impulse response of channel w = equalizer taps. what I know is......to negotiate the effects of...


expectations from a DFE ?

Started by mk in comp.dsp14 years ago 3 replies

Hi, I've been experimenting with adaptive filters for channel equalization and I have a problem with decision feedback case. Initially I...

Hi, I've been experimenting with adaptive filters for channel equalization and I have a problem with decision feedback case. Initially I started with a T/2 fractional linear equalizer adapted with LMS and then converted this to delayed LMS with two delays. I am currently not adding any noise just trying to compensate for the ISI generated by the channel although there is quantization error a...


Behind-the-scenes software equalizer

Started by Anonymous in comp.dsp15 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 ...


Digital Filtering implementation

Started by DSP_newbie in comp.dsp15 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...


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 |---> ------ ------ ^ --- |- -----


Bidirectional equalization

Started by alberto.fuggetta in comp.dsp10 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...


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


ML equalizer

Started by sair...@gmail.com in comp.dsp14 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...