Pre-requisites Sampling theorem – baseband sampling How to Interpret FFT results – complex DFT, frequency bins and FFTShift Analytic signal, Hilbert Transform and FFT Introduction The concept of instantaneous amplitude/phase/frequency…

# Author: Mathuranathan

Pre-requisites Sampling theorem – baseband sampling How to Interpret FFT results – complex DFT, frequency bins and FFTShift Introduction Fourier Transform of a real-valued signal is complex-symmetric. It implies that…

“What is the best filter that I should use?” is often the question asked by many. There exists two different types of Linear Time Invariant (LTI) filters from transfer function standpoint…

Read More Choosing a filter – FIR or IIR – Understanding the design perspective

The author, Floyd M. Gardner an influential expert in the area of PLLs, has presented a good reference book that encompasses all the theoretical and mathematical concepts for the phase…

Read More Phaselock Techniques – Floyd M. Gardner [Book review]

Tapped-delay line filters (basically FIR filters) are best to simulate multiple echoes originating from same source. Hence they can be used to model multipath scenarios. Choose frequency-flat or frequency selective: If the…

Read More Modeling a Frequency Selective Multipath Fading channel using TDL filters

Generation of random variables with required probability distribution characteristic is of paramount importance in simulating a communication system. Here, I will demonstrate how we can generate a simple random variable, estimate &…

Read More How to use Histogram function in Matlab to plot the estimated PDF curve

This tutorial is a part of the website http://www.gaussianwaves.com and created under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. You must credit the author in your work if you remix, tweak,…

Read More OFDM and Cyclic Prefix – a handson demonstration using Matlab

In the previous post, Interpretation of frequency bins, frequency axis arrangement (fftshift/ifftshift) for complex DFT were discussed. In this post, I intend to show you how to obtain magnitude and…

Read More How to interpret FFT results – obtaining magnitude and phase information

Four types of Fourier Transforms: Often, one is confronted with the problem of converting a time domain signal to frequency domain and vice-versa. Fourier Transform is an excellent tool to…

Read More How to Interpret FFT results – complex DFT, frequency bins and FFTShift

‘Gaussianwaves Answers’ – a new Q&A type forum is open and is ready for use by everyone. This discussion forum is open to all, and all are encouraged to contribute…

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