All Questions

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MATLAB poly2trellis for Extended Hamming (64,57)

Current understanding: Extended Hamming (64,57) is constructed using generator polynomial 1 + x + x^6 followed by a parity bit at the end of the codeword to get even parity. The Extended Hamming ...
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Looking for Open Source Image Processing Library that is equivalent to HIPS

Note -- would appreciate any comments on ho to improve the question -- I did the best I could but it I feel it may still be sup-par. HIPS was/is an excellent image processing software. It was ...
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How to calculate the frequency shift of FMCW transmitted signal and received signal using Matlab?

I generate a FMCW chirp signal between 18k-20kHz using Matlab, then sound the signal through the speaker in laptop, then record the reflected signal through the Mic in the laptop. What I want to do is ...
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Do we have aliasing with this chip rate and transmission bandwidth

A particular communication system I came across defines chip time to be 0.57 ns and consequently chip rate (number of chips per second) to be (1760 chips per sec) or 1760 MHz. The transmission ...
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On Bit error rate expressions for channel equalization

I am trying to get the BER curve when I have used Least Square non-blind channel equalization for an FIR channel model with BPSK modulation. Once the channel coefficients are estimated using ...
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Edge Detection on small images

I just newly join to this community. Recently I work on edge detection that is applied on the attached picture. The objects that I want to detect are the white square images (there are 4 of them). So ...
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Generate fourier transform signal

I'm newbie in DSP (maybe the question title is misleading for this reason, I apologize for this, please feel free to edit it) but not in programming. I want to experiment with Fourier (or FFT) ...
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Reference request : Bit error vs SNR expression in channel equalization

I am looking for BER expression when using Least Square estimator and BER for perfect channel knowledge in the application of channel equalization. I have searched papers and books but I have found ...
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ICI of zero frequency

I am modelling inter-carrier interference (ICI) and I wonder how to account for ICI coefficients coming from zero (i.e., DC ) frequency?
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Plotting convoluted and original signals on the same graph

So I have a frequency response (got it by windowed fft-ing) of a note E4 played on a guitar and now I'm trying to implement a dynamic threshold for finding the peaks (fundamental frequency of the note ...
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Delay signal according to normal distribution

I am trying to delay a signal by a certain number of samples. This certain number, I would like to generate using a random normal distribution in Matlab. I am using the following for generating the ...
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EM algorithm and Kalman filter

I am new to the subject of Kalman filtering and therefore my question might seem trivial. I see that there is a tight connection between Kalman filter and EM algorithm when one wants to predict the ...
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Transformation validation

I am am trying to see the validity of my geometric transformation, by imposing a point i got from a tracker in the original image and superimposing it on the image after the transformations. The ...
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Invertible multi-resolution representation of audio/speech signals

What are the invertible (preferably linear) representations of an audio/speech signal which captures the essence of signal in different resolutions and details. Basically, I am looking for ...
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Velocity from acceleration data

I have an acceleration data from accelerometers. I want to get velocity from the data by integrate it using matlab. Here my coding :- ...
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There are many question related to the zero padding a time domain signal to get more frequency bins after performing Fourier transform. As I understand this process is equivalent to trigonometric ...
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Representing and compartmentalizing FFT of audio sample into user friendly spectrum (need direction)

I am using the Apple accelerate framework to do some audio FFT analysis. Here is what I have so far and I want to make sure that my methodology is correct and I am indeed displaying appropriate data ...
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Equation for Bit error rate in channel equalization

Paper1 : Semiblind System Identification with Symbolic Chaotic Sequences download link proposes an EM-UKS estimator for semi-blind system identification of an FIR ...
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Beginner level : How to get this transfer function

Paper : A novel channel equalizer for chaotic digital communication systemDownload link I am having problem in understanding how the transfer function in Eq(6) and the inverse filter for the ...
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Linearized representation of a filter

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 ...
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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 ...
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Frequency Spectrum through Wavelet Transform in Matlab

I have an EMG signal and trying to find out frequency domain features. I am using DWT for this purpose. It gives out coefficients in approximate and detail matrices. Now, I want to use detail coeffs ...
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Simulating the impulse response of a multirate digital filter

I have designed a CIC filter in Verilog and I would like to test its impulse response, but I am not sure where to start from. My input sampling frequency is 51200Hz, the filter is a third order ...
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Spectral Factorization of Magnitude Squared IIR

Taking an IIR: $$H(z) = \frac {A(z)} {B(z)} = \frac {\sum_{n=0}^{N} a_nz^{-n}} {\sum_{m=0}^{M} a_mz^{-m}} \qquad z=e^{iw}$$ The magnitude squared of the numerator $A(z)$ (the maths of the ...
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Lower order modulation are more robust

In some application of Wifi, I read the following remark To have the largest possible range (coverage), the frames are transmitted at the most robust modulation and coding scheme An example of such ...
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MLE of minimum code distance in Bit error rate formula

In paper Performance analysis of communication system based on chaotic symbolic dynamics, Eq(12) contains an expression for the Bit error rate and the MLE of the parameter $w_{min}$ is presented in ...
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What's the best way to compare the same object from different “crops” or angles within multiple images?

I read a similar question, but I'm not sure the techniques discussed will help me. Take for example the two following images: I'm trying to determine if the above images are sourced from the ...
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Kalman Filter for particle tracking

I am new to Kalman and trying to use it for a particle tracking technique for velocity measurments in Multiphase systems. I have particle locations but there are error associated with these locations. ...
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zero-phasing frequency components while keeping the same magnitude, in Matlab

How is it possible? I was thinking of taking just the real part of the DFT of my signal (isn't that zeroing out phases?) with real(fft(X)) but the magnitudes ...
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Determining which Filter from a Z-Plane Plots?

How do i determine which FIR filter (LP, HP, BS, BP) it is from looking at it's z-plane plot?
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Why do we discard imaginary part of the phase spectrum?

Suppose I compute phase spectrum from the fftn function in MATLAB as ...
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What's horming frame in AMR-WB code?

I find a lot of word to talking about "homing frame" in the AMRWB spec and code. So what it is?
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For linear IIR digital filter, what happens for negative frequencies?

By negative frequency, I refer to Fourier transform. Often, the frequency response of a digital filter is only displayed for positive frequencies. For a linear IIR digital filter, what happens for ...
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Creating a jittered clock (in Simulink)

I would like to simulate clock jitter in Simulink. My clock is time varying. I generate the clock with |cos(2*pifrft + g(t))| where g is a function varying with t. I want to give the jitter in terms ...
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derivation of Transfer Function from bode plot

I have some data from a device described in frequency domain (an accelerometer (second-order oscillator) plus a low-pass filter (in cascade)). I sketched the bode plot in Matlab. I must find their ...
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could not constract original matrix with matlab svd's function

I need to read a .wav file, make a 2D matrix from it using stft, generate singular value decomposition of it using svd method and do some watermarkings... but I can't build the original matrix again ...
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Fastest implementation of fft in C++?

I have a MATLAB program that uses fft and ifft a lot. Now I want to translate it to C++ for production. I used OpenCV but I ...
63 views

What is the connection between analog signal to noise ratio and signal to noise ratio in the IQ plane in a quadrature demodulation system?

We would like to compute the quantitative relation between analog noise near the LO frequency and the statistics of points found in the IQ plane after IQ demodulation. In order to completely ...
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I want to calculate the period of the discrete time sequence from taking its fft(x,N). Can any one help?

This is my discrete time periodic signal, the time resolution of the samples is 0.2ms. And it's periodic after each 11 samples. So the fundamental period of the signal is 2ms or the fundamental ...
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EQ - Calculate the power per Octave of a signal through FFT

I'm working on a audio Equalizer, and I'm not sure if the way I obtain the power per octave of my signal is good. Here is the code I have : (I use the third octave bands, which is initialized earlier ...
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Use SNR for Wav signals

I have implemented an audio steganography program in MATLAB. One way to evaluate your steganography method is to use SNR. The formula I found for SNR calculation is mentioned below. The problem is, ...
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Filters - Hilbert Transform and Absolute Value of Magnitude Response

Following relationship between magnitude response and phase response for minimum phase: I have implemented in C++ code using the Hilbert Transform C code from file found online ht.c. However, I am ...
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IFFT Synthesis from an empty spectrum

I'm trying to generate a sawtooth wave using the IFFT. I can do this successfully by first performing an FFT and then putting that analysed spectrum into the IFFT, however I would really like to be ...
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Denoising approach for a combination of several ADC voltage channles

I have 2 ADC channels of constant voltage measurement with small amount of high frequency noise only and no low frequency oscillations. The final signal should be the simple sum of those and denoised ...
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Audio phase shift using Hartley Transform

I want to shift the response phase of an audio signal (float array, length N, value range -1..1). I'm about using Fast Hartley Transform to transform it to the frequency-domain, process phase shift, ...
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How do u prove that a cosine signal with irrational period and another cosine signal with a rational period are orthogonal?

For example,cos(4t) and cos(4*pi*t) sum is aperiodic. Hence it is said that these two signals are orthogonal over infinite limits? But how to prove this? Normal integration of product of the two ...
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BPSK modulation under bandlimited channel

I modulated signal using BPSK modulation and I have series of -1 and 1. Now I have to pass these signal from band limited channel that has frequency response of the form ...
44 views

What is the estimator used in this paper for system identification?

Paper : System Identification using Symbolic Chaotic Sequence download link proposes EM-UKS estimator for system identification of a linear FIR channel when excited by non-linear input. In Fig 3 of ...