tailieunhanh - Báo cáo hóa học: "A New Time-Hopping Multiple Access Communication System Simulator: Application to Ultra-Wideband"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A New Time-Hopping Multiple Access Communication System Simulator: Application to Ultra-Wideband | EURASIP Journal on Applied Signal Processing 2005 3 346-358 2005 Hindawi Publishing Corporation A New Time-Hopping Multiple Access Communication System Simulator Application to Ultra-Wideband Galo Nuno-Barrau Departamento de Senales Sistemas y Radiocomunicaciones Universidad Politecnica de Madrid 28040 Madrid Spain Email galo@ Josts M. Paez-Borraiio Departamento de Senales Sistemas y Radiocomunicaciones Universidad Politecnica de Madrid 28040 Madrid Spain Email jmpaez@ Received 14 September 2003 Revised 16 May 2004 Time-hopping ultra-wideband technology presents some very attractive features for future indoor wireless systems in terms of achievable transmission rate and multiple access capabilities. This paper develops an algorithm to design time-hopping system simulators specially suitable for ultra-wideband which takes advantage of some of the specific characteristics of this kind of systems. The algorithm allows an improvement of both the time capabilities and the achievable sampling rate and can be used to research into the influence of different parameters on the performance of the system. An additional result is the validation of a new general performance formula for time-hopping ultra-wideband systems with multipath channels. Keywords and phrases ultra-wideband time hopping WPAN spread spectrum multipath channel simulation. 1. INTRODUCTION Multiple access MA systems based on time-hopping spread-spectrum TH-SS techniques have recently started to be taken into consideration as a possible solution for the implementation of the future short-range personal communication systems PCSs or wireless personal area networks WPANs 1 . So far the most important TH-SS system has been time-hopping ultra-wideband TH-UWB which is characterized by the use of signals with very large relative bandwidths and reduced power spectral densities 2 3 . According to the US Federal Communications Commission s FCC first report and order an UWB device can be .