Enhancement of Matched filter BER performance in DS-UWB systems using a new channel estimation technique | ||||
| Menoufia Journal of Electronic Engineering Research | ||||
| Article 4, Volume 21, Issue 2, June 2011, Page 147-166 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjeer.2011.66819 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Mohamed Salah elDin1; M. M. Zahra2; Shawky Abdel Fattah2 | ||||
| 1Dept. of Communications Eng., Higher Institute of Engineering, Al Shorouk Academy | ||||
| 2Dept. of Electrical Engineering, Faculty of Engineering, Al Azhar University | ||||
| Abstract | ||||
| One of the major challenges in ultra wideband (UWB) receivers is to recover the signal energy dispersed over too many multi path components, while preserving the receiver complexity as low as possible. To this achieve this, channel estimators based receivers are employed to enhance its Bit Error Rate (BER) performance. In this paper the problem of channel estimation for Direct Sequence ultra wideband (DS UWB) is investigated. Firstly, a modification of the received signal model is introduced. A new channel estimation algorithm is proposed .The proposed algorithm is cost effective, very simple and is independent of the number of paths of the UWB channel. Monte-Carlo simulation is used to calculate the Mean Square Error (MSE) of the proposed estimator by averaging the estimation error of a 1000 generated channel realizations for each of the four different IEEE 802.15.3a UWB channel models. The Mean Squared Error (MSE) of the proposed estimator is compared with that of the time domain Maximum Likelihood (ML) estimator. Simulation results show that The MSE performance of the proposed estimator is competitive to that of the ML even in the case of non perfect orthogonal spreading codes and approaches the behavior of the ML as the length of the spreading code increases. | ||||
| Keywords | ||||
| DS UWB; Rake receiver; mono cycle | ||||
| References | ||||
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[1] K. Siwiak, “Ultra-Wide Band Radio: Introducing a New Technology,” 2001 Spring IEEE Vehicular Technology Conference (VTC), vol. 2, pp. 1088-1093, May 2001.
[2] K. Siwiak, “Ultra-Wide Band Radio: The emergence of an Important RFTechnology,” 2001 Spring IEEE Vehicular Technology Conference (VTC),vol. 2, pp. 1169-1172, May 2001.
[3] K. Siwiak, “Impact of ultra wide band transmissions on a generic receiver,” 2001 Spring IEEE Vehicular Technology Conference (VTC), vol. 2, pp. 1181-1183, May 2001.
[4] Federal Communications Commission, “Revision of Part 15 of the Commission’s Rules Regarding UWB Transmission Systems,” First Report, FCC 02-48, Apr. 2002.
[5] M. Z. Win and Z. A. Kosti´c, “Virtual path analysis of selective Rake receiver in dense multipath channels,” IEEE Commun. Lett., vol. 3, pp. 308–310, Nov. 1999.
[6] J. D. Choi and W. E. Stark, “Performance of ultra-wideband communications with suboptimal receivers in multipath channels,” IEEE J. Select.Areas Commun., vol. 20, pp. 1754–1766, Dec. 2002.
[7] M. Z. Win and R. A. Scholtz, “On the energy capture of ultra –wide bandwidth signals in dense multipath environments,” IEEE Commun. Lett., vol. 2, pp. 245–247, Sept. 1998.
[8] J. Karedal et al., “UWB channel measurements in an industrial environment,” in Proc. IEEE Global Telecomm. Conf., pp. 3511–3516, 2004.
[9] R .A. Schultz, “Multiple Access with Time Hopping Impulse Modulation,” Proc. MILCOM’93? 1993? 3(10)? pp.447-450.
[10] J.F. Foerster, M. Pendergrass and A. F. Molisch, "A Channel Model for Ultrawideband Indoor Communication", MERL (Mitsubishi Electric Research Laboratory) Report TR-2003-73, Nov. 2003.
[11] Chaitali Sengupta, "Algorithms and Architectures for Channel Estimation in Wireless Communication Systems", PhD thesis, RiceUniversity, Houston, Texas, 1998. | ||||
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