blog

Least Mean-Squares Equalizer

December 29, 2018

This tutorial provides an overview of a very simple fininite impulse response least mean-squares equalizer simulation. This is part of my "DSP in 50 lines of C" series.

Inverse Sinc Finite Impulse Response Filter Design

November 3, 2017

This tutorial explains how to generate an inverse sinc filter in liquid-dsp to compensate for the distortion caused by rectangular (sinc) filters commonly implemented in hardware. Many digital transceiver implementations use a very basic filter that applies an equal-weighting average to the input samples.

liquid-dsp release 1.3.0

December 30, 2016

Version 1.3.0 is finally tagged in the Git repository.

New Server for 2016

October 9, 2016

While this isn't huge news, I recently migrated liquidsdr.org over to a new Linode server. Linode doesn't pay me to say this, but I feel like it's good to point out how easy they make it to deploy a brand new Linux server.

Raspberry Pi 3 Floating-point Benchmarks

March 31, 2016

There's been a lot of hype about the Raspberry Pi 3's performance, but how does it fare with signal processing for software-define radios? Here are some benchmarks for multi-threaded performance with liquid-dsp.

Archimedes Prime Spiral

November 8, 2015

This was a fun little Sunday morning coding project I threw together in a little over an hour. Inspired by some prime number videos from numberphile I decided to throw together a simple program to generate an Archimedes prime number spiral.

Raspberry Pi 2 Floating-point Benchmarks

March 14, 2015

Here you'll find a quick benchmark shootout between a few inexpensive ARM-based platforms including the Raspberry Pi B+, the Raspberry Pi 2 B (names can be confusing), and an old Beagle Bone I had lying around.

Linear Modem Bit Error Rates, Part II: Derivation

February 28, 2015

This is the second of a two-part tutorial to derive bit error rate expressions for certain linear modulation schemes.

Linear Modem Bit Error Rates, Part I: Simulation

February 5, 2015

This is the first of a two-part tutorial to simulate bit error rates for linear modulation schemes.

Simplified Phase-locked Loop in C

December 13, 2014

A super simple phase-locked loop in 50 lines of C.

Basic FIR Filter Design

January 31, 2014

This tutorial provides an overview of a well-known simple low-pass FIR filter design technique. This is part of my "DSP in 50 lines of C" series. The basic principle is to generate a sinc function and apply a smoothing window to it.

Writing a Phase-locked Loop in Straight C

November 24, 2013

This tutorial explains how to write and simulate a phase-locked loop in the C programming language.