Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

The tag has no usage guidance.

0
votes
0answers
23 views

blind channel estimation using EM implementation

I would like to implement EM for blind channel estimation. The algorithm is briefly described in this paper, under the section "EM for blind channel identification". I'd like to derive the algorithm ...
0
votes
1answer
34 views

Is the Channel shortening similar to Time domain Equalizer (TEQ)

I used to read about Time domain equalizer (TEQ) in many lectures, i.e here , But in many other papers, that's called Channel shortening i.e here . However, in the a two above links, the cost ...
0
votes
0answers
12 views

Changing BCJR algorithm to work on all trellis states

I am using the BCJR algorithm for channel equalization (simple ISI channel + AWGN). The algorithm assumes that zeros are transmitted in the beginning and in the end, but I would like to change it not ...
0
votes
0answers
24 views

Generating values of EQ presets

I am using this project in Rpi - bmc0/dsp It allows to set various effects and DSP setting to the entire audio stream of the device. I wanted to get some common preset values like Pop, Dance, Rock, ...
0
votes
1answer
60 views

How to get the MLSEEqualizer work with IFFT and FFT blocks in the communication system?

Matlab MLSEE equalizer works fine with the QPSK modulated signal when the signal is propagated over the multipath channel. However, if there are IFFT and FFT blocks used at TX and RX sides, ...
0
votes
1answer
64 views

Equalizers with low data rate systems

In case of using equalizers with ZigBee systems, what type of fading does the channel show, flat or frequency selective, fast or slow? Is the inter-symbol interference (ISI) problem encountered in ...
0
votes
0answers
29 views

Implementing Fractionally Spaced Equalizer

I have been searching for robust algorithm that can be implemented for avoiding the ISI (Inter-Symbol interference), I came across two types of channel equalizations are there. One is data Aided (...
0
votes
2answers
82 views

Inter Symbol Interference (ISI) / Equalization in Digital Signal Processing

I am studying the OFDM system and before to start I have decided to study the main concepts of modulation. And I have spent yet a lot of time to understand the concept of an equalization to reduce ISI....
1
vote
0answers
66 views

Blind equalization with constant modulus algorithm in GNU Radio

I'm currently simulating the effect of multitap channel on BPSK as well as its remedy i.e. equalization. The modem is expected to work with satellite TT&C transponder. The communication channel ...
0
votes
0answers
18 views

Initial weighted taps for MMSE equalizer

I have a question regarding the tap weights calculation for a MMSE equalizer. In order to calculate the tap weights one needs to know the cross-correlation vector between the taps matrix and the ...
0
votes
2answers
43 views

Equalize Speaker using impulse response

So I have this school project where my aim is to improve a loudspeaker in general, my idea is to mesure the impulse response of the room using a mic, then use this mesure to conceive a loudspeaker ...
1
vote
0answers
92 views

Equalizer design for spectral gain flatness

I'm trying to design an equalizer for spectral flatness over a 100MHz signal for an LTE channel emulator. A channel emulator simply multiples channel coefficients with an external signal from a signal ...
0
votes
0answers
43 views

Best equalizer for a perfect CSI

Assuming a MIMO system and a perfect CSI (the channel matrix is known), what can be the best equalizer? ZF or others?
0
votes
1answer
91 views

Equalizer coefficients and channel coefficients

Blind channel equalization methods equalize the channel without using the source data and without knowing the impulse response of the channel. Consider the channel to be a single input single output ...
0
votes
1answer
88 views

Received signal error vs. BER

It is my understanding that the least squares algorithm (e.g., in equalization) minimizes the received signal error. However, minimizing the received signal error does not necessarily equate to ...
0
votes
0answers
27 views

Need some help in optimization problem in blind channel equalization

Blind Channel Equalization is used to inverse model the channel effect on recieved signal so that the unnecessary noise and ISI is removed from recieved signal constellaion.The most famous algorithm ...
0
votes
0answers
182 views

Why linear equalizer (LMS,RLS) cannot equalize every (FIR) channel?

MATLAB have an example that explain how equalizers work, that is nicely work on impulse response chan=[.986; .845; .237; .123+.31i], but I altered it to ...
1
vote
1answer
179 views

Convolution between two unequal length vectors

Considering an example, where the model is \begin{align} x[n] = \mathbf{h}^\mathsf{T}\mathbf{u}[n] + w[n]. \label{Eq1} \end{align} $\mathbf{h} = [h_0,h_1,\ldots,h_{M-1}]^\mathsf{T}$ of length $M$ ...
1
vote
0answers
34 views

Digital Filter Design Accuracy [duplicate]

Having only dealt with digital filter scarcely, the question dawned to me when I used the firls function in matlab to design an equalizer with a certain gain response. In general, can we prescribe ...
1
vote
1answer
209 views

LMS and delta impulse response- Equalization concepts

I have been reading about equalization and channel estimation in order to apply to my application of estimating trajectory path for a two-wheeled robot. The application is quite similar to ...
0
votes
0answers
77 views

calculating bit error rate using equalizers?

I have written the following simple code to modulate a signal using OQPSK, transmit it over a channel with impulse response h, add a random Guassian noise, and equalize the received signal using the ...
0
votes
1answer
178 views

Fequency Domain Oversampling - decimating when going back to time domain

I'm currently trying to simulate Frequency Domain Equalization, and the effect that over sampling in the frequency domain has on the affect of the equalization. If I understand things correctly this ...
1
vote
3answers
419 views

Does an audio equalizer consist of a perfect-reconstruction filterbank?

Within the theory of perfect reconstruction, I discovered that it is not obvious that the combination of all filters in a filterbank gives you the original signal. Therefore, I was wondering whether ...
0
votes
1answer
1k views

Calculate Q factor of a Low Shelf and High Shelf filter

I'm developing an app that has an EQ using eq10q plugin. My eq has 10 bands. I'm using peaking filters for the middle bands and a low shelf filter for the first band and a high shelf filter for the ...
0
votes
0answers
159 views

Channel length, Cyclic prefix length and number of channel taps relationship

In the design of a communication system, specifically multi carrier OFDM system and DMT/OFDM, I would like to understand the relationship, if any, between the following parameters: Channel length [...
0
votes
1answer
454 views

Matlab: Help in applying equalizer and proper calculation of symbol error rate for QAM modulation in Rayleigh channel

I am unable to understand why the Constant Modulus ALgorithm is not functioning properly for QAM modulation in Rayleigh multipath fading. The same code worked for BPSK in AWGN (previous Question ...
1
vote
1answer
495 views

Given an FIR filter coefficients, how can I find coefficients of its equalizer filter?

I have an N-tap direct form complex FIR filter with known coefficients [c0 c1 .. cn]. I want to find the coefficients of its equalizer filter which when cascaded ...
0
votes
1answer
492 views

Matlab: Help in understanding if the example for Maximum Likelihood Equalizer is properly functioning

I am stuck in the part where I need to apply the MLSE Equalizer with Viterbi code. The equalizer is an optimal. I am using the Communication Toolbox http://www.mathworks.com/help/comm/ref/comm....
3
votes
1answer
2k views

Design of equalizer for wireless communication

I am having difficulty in trying to understand the working mechanism of an equalizer. Please correct me where wrong. Mechanism of an Equalizer - The purpose of an equalizer is to reduce intersymbol ...
2
votes
1answer
109 views

On the application of chaos in signal processing

Paper: A novel channel equalizer for chaotic digital communication system (DOI, RS link). I am having problem in understanding their claim which is that a nonlinear system, considered here to be a ...
1
vote
2answers
1k views

Decibels conversion into amplitude ratio

I want to convert db into amplitude ratio. I did some research but I only found online convertor, and I don't understand what's on Wikipedia very well... Here is a little of backstory : I am a ...
0
votes
1answer
1k views

Help me understanding the super equalizer source code

Please forgive my bad English. Hello, I'm trying to understand Shibatch's super equalizer Winamp plugin source, but I'm not good at DSP and mathematics. It seems that super equalizer plugin uses ...
3
votes
4answers
727 views

Equalizing $1/f$ noise

I am recently acquiring data through ADC on signals ranging from $0.1\textrm{ Hz}$ to $50\textrm{ kHz}$ ($F_s = 128\textrm{ kHz}$). I noticed that apart from the white noise, I have something similar ...
0
votes
1answer
315 views

Strange Results from Biquad Peaking EQ Filter

I have a signal that I am filtering on an MCU (STM32F405) that I get from a codec (CS42L52). It is being sampled at a sampling frequency of 48kHz (actually between 48400 and 48600). I have a ping ...
3
votes
1answer
370 views

Adaptive equalizer for IIR channel?

I am quite new to the idea of equalization. I have a few queries regarding the same. In my application I require to equalize a channel whose impulse response is an IIR response. Is it possible to ...
3
votes
2answers
958 views

Viterbi equalizer in a GSM system

I'm about to tackle implementing a Viterbi equalizer fo a GSM system in gnuradio. I went through the internet and ieeexplore and I think that this document explains it best: Application of Viterbi ...
2
votes
0answers
117 views

TDE, OFDE and FDE equalizer simplest exmple in matlab

I want to implement the equalizer in matlab. I am just learning this. I want a good kick start code that can help me to learn it further. I searched a lot on Google but do not find a good reference ...
1
vote
2answers
3k views

NAudio real-time equalizer

I have designed 9 IIR bandpass filters (chebyshev type 1, order 4) using fdatool in Matlab. Then I use a and b filter coefficients to apply it on differential equation. So, my question is how to apply ...