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.

http://liquidsdr.org/blog/firdespm-invsinc/

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

http://liquidsdr.org/blog/pll-howto/

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

http://liquidsdr.org/blog/pll-simple-howto/

Most of liquid 's signal processing elements are C structures which retain the object's parameters, state, and other useful information. The naming convention is basename_xxxt_method where basename is the base object name (e.g. interp ), xxxt is the type definition, and method is the object method.

http://liquidsdr.org/doc/datastructures/

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

http://liquidsdr.org/blog/modem-ber-sim/