A Robust Reception of IEEE 802.15.4a IR-TH UWB in Dense Multipath and Gaussian Noise

Authors: Farah Haroon, Haroon Rasheed, Kazi M Ahmed

Abstract:

IEEE 802.15.4a impulse radio-time hopping ultra wide band (IR-TH UWB) physical layer, due to small duty cycle and very short pulse widths is robust against multipath propagation. However, scattering and reflections with the large number of obstacles in indoor channel environments, give rise to dense multipath fading. It imposes serious problem to optimum Rake receiver architectures, for which very large number of fingers are needed. Presence of strong noise also affects the reception of fine pulses having extremely low power spectral density. A robust SRake receiver for IEEE 802.15.4a IRTH UWB in dense multipath and additive white Gaussian noise (AWGN) is proposed to efficiently recover the weak signals with much reduced complexity. It adaptively increases the signal to noise (SNR) by decreasing noise through a recursive least square (RLS) algorithm. For simulation, dense multipath environment of IEEE 802.15.4a industrial non line of sight (NLOS) is employed. The power delay profile (PDF) and the cumulative distribution function (CDF) for the respective channel environment are found. Moreover, the error performance of the proposed architecture is evaluated in comparison with conventional SRake and AWGN correlation receivers. The simulation results indicate a substantial performance improvement with very less number of Rake fingers.

Keywords: Adaptive noise cancellation, dense multipath propoagation, IEEE 802.15.4a, IR-TH UWB, industrial NLOS environment, SRake receiver

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070535

References:

[1] IEEE 802.15.4a-2007,"Part 15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area Networks (WPANs); Ammendment 1: Add Alternate PHYs," Mar. 2007.
[2] D. Dardari, C. C. Chong and M. Z. Win, "Threshold-Based Time-of- Arrival Estimators in UWB Dense Multipath Channels," IEEE Transactions on Communications, vol. 56, no. 8, pp. 1366-1378, August 2008.
[3] A. D. Reyna and I. A. Catalina, "Practical search strategy for ultra wideband signal acquisition in the dense multipath channel," IEEE Mediterranean Electrotechnical Conference (MELECON), pp. 635- 638, May 2006.
[4] M. Kim, H. Kim and J. Kim, "High-Level Modeling of UWB PHY for IEEE802.15.4a," Convergence and Hybrid Information Technology (ICHIT), pp. 351-354, 2008.
[5] W. C. Liu and L. Wang, "BER Analysis of the IEEE 802.15.4a Channel Model with RAKE Receiver," IEEE Vehicular Technology Conference (VTC Fall), pp. 1-5, 2006.
[6] W. c. Liu and L. C. Wang, "BER Analysis in a Generalized UWB Frequency Selective Fading Channel with Randomly Arriving Clusters and Rays," IEEE International Conference on Communication (ICC), pp. 4281-4286, 2007.
[7] Z. Ahmadian and L. Lampe, "Performance Analysis of the IEEE 802.15.4a UWB System," IEEE Transactions on Communications, vol. 57, no. 5, pp. 1474-1485, 2009.
[8] H. Gong, H. Nie and Z. Chen, "Performance Comparisons of UWB Selective Rake and Transmitted Reference Receivers under IEEE802.15.4a Industrial Environments," IEEE Wireless and Microwave Technology Conference (WAMICON), pp. 1-5, 2006.
[9] B. Widrow, J. R. Glover, J. M. McCool, J. Kaunitz, C. R. Williams, E. Dong and R. C. Goodlin, "Adaptive Noise Cancelling: Principles and Applications," Proceedings of the IEEE, vol. 63, no. 12, Dec. 1975.
[10] S. G. Glisic and P. A. Leppanen,Wireless Communications: TDMA vs CDMA, Kluwer Academic Publishers, 1997.
[11] A. F. Molisch, "Ultra-Wide-Band Propagation Channels" Proceedings of the IEEE, vol. 97, no. 2, pp. 353-371, 2009.
[12] J. Karedal, S. Wyne, P. Almers, F. Tufvesson and A. F. Molisch, "A measurement Based Statistical Model for Industrial Ultra Wideband Channels," IEEE Transactions on Wireless Communication, vol. 6, no. 8, 2007.
[13] A. F. Molisch, K. Balakrishnan, D. Cassioli, C. C. Chong, S. Emami, J. Karedal, A. Fort, B. Kanan, J. Kunisch, H. G. Schantz, K. Siwiak and M. Z. Win, "A Comprehensive Standardized Model for Ultrawideband Propagation Channels," IEEE Transactions on Antenna and Propagation, vol. , no. 11 Part 1, pp. 3151-3166, 2006.
[14] S. Haykin, Adaptive Filter Theory; 3rd Edition, Prentice Hall Information and System Sciences Series, 1996.
[15] A. F. Molisch, K. Balakrishnan, D. Cassioli, C. C. Chong, S. Emami and J. Karedal, "IEEE 802.15.4a Channel Model-final report," Taskgroup 4a (TG4a), Tech. Report, 2004.