The generation of bandwidth efficient modulation schemes using direct digital synthesis

This paper describes the generation of bandwidth efficient modulation techniques for indoor wireless communication and other applications using direct digital synthesis. Direct digital synthesis is an attractive alternative to traditional implementation methods. It allows the generation of efficient and easily modifiable modulation schemes. The Hewlett Packard Frequency Agile Signal Simulator (HPFASS) is one system which uses direct digital synthesis. It allows the introduction of various channel distortions: fading, co-channel and adjacent channel interference and quantifiable noise