In most existing transmitted-reference ultra-wideband (TR-UWB) communication systems, receivers use the standard Gaussian approximation (SGA) for multiuser interference (MUI). It is an assumption used in most conventional multiuser systems, where the MUI tends to a Gaussian process by the central limit theorem, and convergence is relatively fast with respect to the number of users. However, for TR-UWB systems which are developed for short-range applications, we have a small number of active users. In this case, significant performance degradation is found in TR-UWB receivers due to the impreciseness of SGA. In this paper, we show that the Middleton class-A model is a more appropriate statistical model for MUI modeling in TR-UWB systems than the often used SGA. A closed-form expression for the probability density function (PDF) of the TR-UWB system under MUI, Gaussian noise and impulsive alpha-stable interference is developed. All these analytical results are confirmed by numerical simulations.
2. Fan, Z. G., L. X. Ran, and J. A. Kong, "Source pulse optimizations for UWB radio systems," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 11, 1535-1550, 2006.
doi:10.1163/156939306779274309
3. Win, , M. Z. and R. A. Scholtz, "On the energy capture of ultrawide bandwidth signals in dense multipath environments," IEEE J. Sel. Areas Commun., Vol. 2, No. 2, 245-247, Sep. 1998.
4. Liu, X., B.-Z. Wang, S. Xiao, and J. Deng, "Performance of impulse radio UWB communications based on time reversal technique," Progress In Electromagnetics Research, Vol. 79, 401-413, 2008.
doi:10.2528/PIER07102205
5. Xiao, S. Q., J. Chen, B.-Z. Wang, and X. F. Liu, "A numerical study on time-reversal electromagnetic wave for indoor ultrawideband signal transmission," Progress In Electromagnetics Research, Vol. 77, 329-342, 2007.
doi:10.2528/PIER07082501
6. Hoctor, R. T. and H. W. Tomlinson, "An overview of delay-hopped transmitted-reference RF communications,", Technique Information Series: G.E. Research and Development Center, Jan. 2002.
7. Xu, Z. and B. M. Sadler, "Multiuser transmitted reference ultra-wideband communication systems," IEEE J. Sel. Areas Commun., Vol. 24, No. 4, 766-772, Apr. 2006.
doi:10.1109/JSAC.2005.863826
8. Jia, T. and D. I. Kim, "Multiple access performance of balanced UWB transmitted-reference systems in multipath," IEEE Trans. Wireless Commun., Vol. 7, No. 3, 1084-1094, Mar. 2008.
doi:10.1109/TWC.2008.060864
9. D'Amico, A. and U. Mengali, "Code-multiplexed transmitted-reference UWB systems in a multi-user environment," IEEE Trans. Commun., Vol. 58, No. 3, 966-974, Mar. 2010.
doi:10.1109/TCOMM.2010.03.080258
10. Forouzan, A. R., M. N. Kenari, and J. A. Salehi, "Performance analysis of time-hopping spread-spectrum multiple-access systems: Uncoded and coded schemes," IEEE Trans. Wireless Commun., Vol. 1, No. 4, 671-681, Oct. 2002.
doi:10.1109/TWC.2002.804186
11. Salehi, J. A. and C. A. Brackett, "Code division multiple-access techniques in optical fiber networks. Part II: Systems performance analysis," IEEE Trans. Commun., Vol. 37, No. 8, 834-841, Aug. 1989.
doi:10.1109/26.31182
12. NIST/SEMATECH, "6.3.3.1. counts control charts," NIST/SEMATECH E-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/.
13. Middleton, D., "Statistical models of electromagnetic interference," IEEE Trans. Electromagn. Compat., Vol. 19, No. 3, 106-127, Aug. 1977.
doi:10.1109/TEMC.1977.303527
14. Li, X. T., J. Sun, L. W. Jin, and M. Liu, "Bi-parameter CGM model for approximation of α-stable PDF," Electronics Letters, Vol. 44, No. 18, 1096-1097, Aug. 2008.
doi:10.1049/el:20080955
15. Di Renzo, M., L. A. Annoni, F. Graziosi, and F. Santucci, "A novel class of algorithms for timing acquisition of differential transmitted-reference UWB receivers: Architecture, performance analysis and system design," IEEE Trans. Wireless Commun., Vol. 7, No. 6, 2368-2387, Jun. 2008.
doi:10.1109/TWC.2008.070097
16. Cover, T. M. and J. A. Thomas, Elements of Information Theory, Wiley, NY, 1991.
doi:10.1002/0471200611
17. Middleton, D., "Non-Gaussian noise models in signal processing for telecommunications: New methods and results for class A and class B noise models," IEEE Trans. on Information Theory, Vol. 45, No. 4, 1129-1149, May 1999.
doi:10.1109/18.761256
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