Improved Rake Receiver Based On the Signal Sign Separation in Maximal Ratio Combining Technique for Ultra-Wideband Wireless Communication Systems

Authors: Rashid A. Fayadh, F. Malek, Hilal A. Fadhil, Norshafinash Saudin

Abstract:

At receiving high data rate in ultra wideband (UWB) technology for many users, there are multiple user interference and inter-symbol interference as obstacles in the multi-path reception technique. Since the rake receivers were designed to collect many resolvable paths, even more than hundred of paths. Rake receiver implementation structures have been proposed towards increasing the complexity for getting better performances in indoor or outdoor multi-path receivers by reducing the bit error rate (BER). So several rake structures were proposed in the past to reduce the number of combining and estimating of resolvable paths. To this aim, we suggested two improved rake receivers based on signal sign separation in the maximal ratio combiner (MRC), called positive-negative MRC selective rake (P-N/MRC-S-rake) and positive-negative MRC partial rake (P-N/MRC-S-rake) receivers. These receivers were introduced to reduce the complexity with less number of fingers and improving the performance with low BER. Before decision circuit, there is a comparator to compare between positive quantity and negative quantity to decide whether the transmitted bit is 1 or 0. The BER was driven by MATLAB simulation with multi-path environments for impulse radio time-hopping binary phase shift keying (TH-BPSK) modulation and the results were compared with those of conventional rake receivers.

Keywords: Selective and partial rake receivers, positive and negative signal separation, maximal ratio combiner, bit error rate performance.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1089309

References:

[1] J. G Prokis, "Digital Communications, 4th Edition,” McGraw-Hill International Press, pp. 795-806, 2001.
[2] A. F. Molisch, J. R. Foerster, and M. Pendergrass, "Channel Models for Ultra Wideband Personal Area Network,” IEEE Wireless Commun., Vol. 10, pp. 14-21, Dec. 2003.
[3] Florin Craciun, Ion Marghescu, and Octavian Fratu, "Rake Receiver Performances for PAM-TH-UWB Systems,” 19th Telecomunications Forum TELFOR Conference, Serbia, Belgrade, pp. 22-24, Nov. 2011.
[4] Cassioli D., Win M. Z., Vatalaro F., and Molisch A. F., "Low Complexity Rake Receivers in Ultra-Wideband Channels,” IEEE Transactions Wireless Communications, Vol. 6, pp. 1265-1275, 2007.
[5] Leonardo Betancur Agudelo and Andres Navarro Cadavid, "A Novel Correlation Adaptive Receiver for High Speed Transctions in Ultra Wide Band Systems with Realistic Channel Estimation,” IEEE Journal on Selected Area in Communications, Vol. 27, No. 8, Oct. 2009.
[6] Saleh A. A. and Valenzuela R. A., "A Statistical Model for Indoor Multipath Propagation,” IEEE Journal of Selection Areas Communication, Vol. 5, pp. 128-137, 1987.
[7] Aimilia P. Doukeli, Athanasios S. Lioumpas, George K. Karagiannidis, and Panayiotis V. Frangos, "Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications,” Springer Science + Business Media, Wireless Pers. Commun., Vol. 62, pp. 715-728, July 2012.
[8] Mischa D., Allen B., Armogida A., McGregor S., Ghavami M., and Aghvami A. H., "A Novel Power Loss Model for Short Range UWB Transmission,” IEEE Conference on Ultra Wideband Systems and Technologies, pp. 81-85, 2004.
[9] Theriault M., Rusch L. A., Roy S., and Fortier P., "A semi-analytic method for BER performance of rake-based UWB receivers,” IEEE Wireless Communications and Networking Conference, pp. 112-117, 2008.
[10] S. Zhao and H. Liu, "Transmitter-side multipath processing for pulsed UWB systems considering pulse overlapping and narrow-band interference,” IEEE Transactions Veh. Technol., Vol. 56, pp. 3502-3510, Nov. 2007.