It`s my students work about simulation on mathcad hf communications signal modes in ionosphere. Parameters for model look at http://omniweb.gsfc.nasa.gov/vitmo/iri_vitmo.html

Canonical Signed Digit Study (CSD) NASA October 2006

NASA - [Aerospace History 16] - Touchdown, The Development of Propulsion Controlled Aircraft at NASA Dryden (pdf)

几乎所有的现代化通信系统都把纠错编码作为一个基本组成部分。RS码由于 具有强有力的纠错功能，已经被NASA、ESA、CCSDS等空间组织接受，用于空间信道纠错。 本文简单论述了RS编码原理，纠错算法及工作流程，能使大家初步了解RS编码-Almost all modern communication systems regard the error correction coding as a basic component. RS code due to Powerful error