EURASIP Journal on Wireless Communications and Networking 
Volume 2006 (2006), Article ID 56849, 10 pages
doi:10.1155/WCN/2006/56849

Multiuser Interference Mitigation in Noncoherent UWB Ranging via Nonlinear Filtering

Zafer Sahinoglu1 and Ismail Guvenc2

 1Mitsubishi Electric Research Labs, 201 Broadway Avenue, Cambridge 02139, MA, USA
2Department of Electrical Engineering, University of South Florida, Tampa 33620, FL, USA
Received 1 September 2005; Revised 13 April 2006; Accepted 13 June 2006

Abstract

Ranging with energy detectors enables low-cost implementation. However, any interference can be quite detrimental to range accuracy. We develop a method that performs nonlinear filtering on the received signal energy to mitigate multiuser interference (MUI), and we test it over time hopping and direct sequence impulse radio ultra-wideband signals. Simulations conducted over IEEE 802.15.4a residential line of sight ultrawideband multipath channels indicate that nonlinear filtering helps sustain range estimation accuracy in the presence of strong MUI.