Performance analysis of IR-UWB in a multi-user environment

In Impulse Radio Ultra Wide Band (IR-UWB) based systems, we show that the Multi-User Interference (MUI) assuming fixed spreading codes can be well approximated by a Generalized-Gaussian Distribution (GGD). Then, we derive an accurate closed-form expression of the approximation for the Average Error Probability (AEP) in both Direct-Sequence (DS) and time-hopping (TH) multiple access context. From this approximation, we are able to characterize and to select the set of codes minimizing the AEP for both multiple access techniques. The merit of each multiple access technique is then analyzed: we especially prove that the probability to find an optimal pair of codes goes to one when increasing the number of chips per symbol with TH technique whereas this probability goes to zero with DS technique. Numerical illustrations confirm our claims.

[1]  S. Kay.  Fundamentals of statistical signal processing: estimation theory , 1993 .

[2]  J. Fiorina,et al.  Revisiting TH-IR-UWB performance limits dependency on essential system parameters using the Generalized Gaussian Approximation , 2007, 2007 IEEE International Conference on Ultra-Wideband.

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

[4]  Robert A. Scholtz,et al.  Comparison of CDMA and modulation schemes for UWB radio in a multipath environment , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

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

[6]  Philippe Ciblat,et al.  Optimal time-hopping codes for multi-user interference mitigation in ultra-wide bandwidth impulse radio , 2006, IEEE Transactions on Wireless Communications.

[7]  Tomaso Erseghe,et al.  On UWB Impulse Radio Receivers Derived by Modeling MAI as a Gaussian Mixture Process , 2008, IEEE Transactions on Wireless Communications.

[8]  Bo Hu,et al.  Soft-Limiting Receiver Structures for Time-Hopping UWB in Multiple-Access Interference , 2008, IEEE Transactions on Vehicular Technology.

[9]  Arumugam Nallanathan,et al.  A Novel High Data Rate Prerake DS UWB Multiple Access System: Interference Modeling and Tradeoff Between Energy Capture and Imperfect Channel Estimation Effect , 2008, IEEE Transactions on Wireless Communications.

[10]  V. Srinivasa Somayazulu,et al.  Multiple access performance in UWB systems using time hopping vs. direct sequence spreading , 2002, 2002 IEEE Wireless Communications and Networking Conference Record. WCNC 2002 (Cat. No.02TH8609).

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

[12]  W. Niehsen.  Robust Kalman filtering with generalized Gaussian measurement noise , 2002 .

[13]  C. L. Nikias,et al.  Signal processing with alpha-stable distributions and applications , 1995 .

[14]  Jocelyn Fiorina,et al.  On the asymptotic distribution of the correlation receiver output for time-hopped UWB signals , 2006, IEEE Transactions on Signal Processing.

[15]  M. L. Welborn.  System considerations for ultra-wideband wireless networks , 2001, Proceedings RAWCON 2001. 2001 IEEE Radio and Wireless Conference (Cat.No.01EX514).

[16]  Bo Hu,et al.  Exact bit error rate analysis of TH-PPM UWB systems in the presence of multiple-access interference , 2003, IEEE Communications Letters.

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

[18]  L. Clavier,et al.  Modeling Multiple Access Interference in Ad Hoc Networks Based on IR-UWB Signals Up-Converted to 60 GHz , 2007, 2007 European Conference on Wireless Technologies.

[19]  Andreas F. Molisch,et al.  Channel models for ultrawideband personal area networks , 2003, IEEE Wireless Communications.

[20]  Masoumeh Nasiri-Kenari,et al.  Performance analysis of ultrawideband time-hopping code division multiple access systems: uncoded and coded schemes , 2001, ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).

[21]  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).

[22]  P. Ciblat,et al.  Inter-symbol/inter-frame interference in time-hopping ultra wideband impulse radio system , 2005, 2005 IEEE International Conference on Ultra-Wideband.