Wideband spread spectrum modulation system for ubiquitous communication services
Saki Yatano, Yumi Takizawa, Atsushi Fukasawa · 2007
Abstract:- A wideband spread spectrum (SS) system is proposed in this paper for a radio air interface scheme of a ubiquitous network system. Ubiquitous network system is highly reactive to provide sufficient information for anybody, anytime, and anywhere for daily lives, business, and scientific utilities. This radio system is composed of wideband modulation, coherent demodulation, advanced synchronization based on a matched filter system, and interference canceller for enhanced capacity. In this paper, concept of ubiquitous communication network is clarified. A wideband transmission scheme of spread spectrum (SS) modulation with code division multiple access (CDMA) scheme is proposed for radio air interface. Prototype hardware was implemented and validated for this scheme. Key-Words:- SS modulation, coherent demodulation, reliable synchronization, digital matched filter, variable data rate 1