EURASIP Journal on Wireless Communications and Networking 
Volume 2008 (2008), Article ID 273018, 9 pages
doi:10.1155/2008/273018
Research Article

Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications over Indoor Fading Channels

Hao Zhang1 and T. Aaron Gulliver2

 1Department of Electrical Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
2Department of Electrical & Computer Engineering, University of Victoria, P.O. Box 3055, STN CSC, Victoria, BC, V8S 4W9, Canada
Received 27 June 2007; Revised 10 October 2007; Accepted 10 February 2008

Recommended by Weidong Xiang

Abstract

The capacity of time-hopping pulse position modulation (PPM) and pulse amplitude modulation (PAM) for an ultra-wideband (UWB) communication system is investigated based on the multipath fading statistics of UWB indoor wireless channels. A frequency-selective fading channel is considered for both single-user and multiple-user UWB wireless systems. A Gaussian approximation based on the single-user results is used to derive the multiple access capacity. Capacity expressions are derived from a signal-to-noise-ratio (SNR) perspective for various fading environments. The capacity expressions are verified via Monte Carlo simulation.