Robust Detectors for TH IR-UWB Systems with Multiuser Interference

It has been recently established that multiuser interference (MUI) in time-hopping impulse-radio ultra-wideband (TH IR-UWB) systems is highly impulsive and hence the conventional matched filter (MF) receiver based on the assumption of Gaussian MUI is no longer optimum. In this paper, two novel receiver structures for detecting TH IR-UWB signals in the presence of MUI are proposed. The first detector is based on a two-term approximation for the distribution of the interference process and noise and the second uses a non-linear penalty function for the decision statistic. Simulation results show that the proposed detectors perform considerably better than the conventional MF receiver and also outperform a recently devised soft-limiting detector in MUI limited environments.

[1]  Bo Hu,et al.  Accurate performance evaluation of time-hopping and direct-sequence UWB systems in multi-user interference , 2005, IEEE Transactions on Communications.

[2]  Robert A. Scholtz,et al.  Multiple access with time-hopping impulse modulation , 1993, Proceedings of MILCOM '93 - IEEE Military Communications Conference.

[3]  Sergio Benedetto,et al.  Performance evaluation of TH-PPM UWB systems in the presence of multiuser interference , 2003, IEEE Communications Letters.

[4]  Jocelyn Fiorina,et al.  WLC28-2: A Simple IR-UWB Receiver Adapted to Multi-User Interferences , 2006, IEEE Globecom 2006.

[5]  Thomas Kaiser,et al.  On the impulsiveness of multiuser interferences in TH-PPM-UWB systems , 2006, IEEE Transactions on Signal Processing.

[6]  G. Durisi,et al.  On the validity of Gaussian approximation to characterize the multiuser capacity of UWB TH PPM , 2002, 2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580).

[7]  Shahrokh Valaee,et al.  A new choice of penalty function for robust multiuser detection based on M-estimation , 2005, IEEE Transactions on Communications.

[8]  V. Cellini,et al.  A novel joint channel and multi-user interference statistics estimator for UWB-IR based on Gaussian mixture model , 2005, 2005 IEEE International Conference on Ultra-Wideband.

[9]  J.-Y. Le Boudec,et al.  Interference Mitigation by Statistical Interference Modeling in an Impulse Radio UWB Receiver , 2006, 2006 IEEE International Conference on Ultra-Wideband.

[10]  H. Vincent Poor,et al.  Robust multiuser detection in non-Gaussian channels , 1999, IEEE Trans. Signal Process..

[11]  E. Masry,et al.  A non-Gaussian approach to the performance analysis of UWB TH-BPPM systems , 2003, IEEE Conference on Ultra Wideband Systems and Technologies, 2003.

[12]  N.C. Beaulieu,et al.  An Adaptive Threshold Soft-Limiting UWB Receiver with Improved Performance in Multiuser Interference , 2006, 2006 IEEE International Conference on Ultra-Wideband.

[13]  Moe Z. Win,et al.  Ultra-wide bandwidth time-hopping spread-spectrum impulse radio for wireless multiple-access communications , 2000, IEEE Trans. Commun..

[14]  Masoumeh Nasiri-Kenari,et al.  Performance analysis of time-hopping spread-spectrum multiple-access systems: uncoded and coded schemes , 2002, IEEE Trans. Wirel. Commun..