Scicos-ModNum ("MODulations NUMériques") is an open and free Scilab/Scicos toolbox for the modeling and the simulation of communication systems. 

Scicos-ModNum proposes blocks, schematics and in-line functions of base-band PSK/QAM modulations in order to build communication chains in the Scilab/Scicos environment.

Components used to build spread-spectrum communication systems, such Pseudo Noise sequence generators (Quasi-Chaotic, PN and Gold sequence generators) are also included.

Scicos-ModNum also includes miscellaneous scopes for Scicos, such as a 3D trajectory Scope and other scopes used for analysis of digital transmissions (e.g. Eye Diagram Scope, Scattered Diagram ).

Schematics and blocks of integer and fractional frequency synthesizer components (e.g. Phase/Frequency Detector, VCO, Delta-Sigma modulators,...) are provided.

Scicos-ModNum also focuses on the simulation of chaotic systems and gives schematics of simulation of Chua's, Rössler's, Van Der Pol's systems (and others).

Scicos-ModNum web site is here.