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# A Quadrature Signals Tutorial: Complex, But Not Complicated

posted by Rick Lyons on Apr 12 2013 under Basics | Communication | Tutorial

# A Fixed-Point Introduction by Example

Fixed-point is used to represent fractional numbers of finite-word length.  Fixed-point is an interpretation of a 2's compliment number usually signed but not limited to sign representation. &nbs...

posted by Christopher Felton on Apr 25 2011 under FPGA | Basics

# Python scipy.signal IIR Filter Design

Introduction The following is an introduction on how to design an infinite impulse response (IIR) filters using the Python scipy.signal package.  This post, mainly, covers how to use the scipy...

posted by Christopher Felton on May 13 2012 under Basics | Python

# Polyphase filter / Farrows interpolation

Hello, this article is meant to give a quick overview over polyphase filtering and Farrows interpolation. A good reference with more depth is for example Fred Harris' paper: http://www.signumconce...

posted by Markus Nentwig on Sep 18 2007 under Basics

# Delay estimation by FFT

Given x=sig(t) and y=ref(t), returns [c, ref(t+delta), delta)] = fitSignal(y, x);:Estimates and corrects delay and scaling factor between two signals Code snippet This article relates to the Matlab ...

posted by Markus Nentwig on Sep 22 2007 under Matlab | Basics | Tips and Tricks

# Pulse Shaping in Single-Carrier Communication Systems

Some common conceptual hurdles for beginning communications engineers have to do with "Pulse Shaping" or the closely-related, even synonymous, topics of "matched filtering", "...

posted by Eric Jacobsen on Apr 10 2008 under Basics | Wireless | Communication

# Curse you, iPython Notebook!

First, I think ipython is great. I use it daily and always have an ipython terminal open.  But just recently, I was showing off the ipython 0.12 notebook and in the process created a ...

posted by Christopher Felton on May 1 2012 under Basics | Python

# Instantaneous Frequency Measurement

I would like to talk about the oft used method of measuring the carrier frequency in the world of Signal Collection and Characterization world. It is an elegant technique because of its simplicity. Bu...

posted by Parth Vakil on Feb 4 2008 under Matlab | FPGA | Basics

# Frequency Dependence in Free Space Propagation

IntroductionIt seems to be fairly common knowledge, even among practicing professionals, that the efficiency of propagation of wireless signals is frequency dependent. Generally it is believed that lo...

posted by Eric Jacobsen on May 14 2008 under Basics | Wireless | Communication