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On the Implementation of a Probabilistic Equalizer for Low-Cost Impulse Radio UWB in High Data Rate
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Wireless Sensor Network·Volume 01 (2009)·Pages 245–256·Published 20 November 2009·DOI10.4236/wsn.2009.14031
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Abstract
This paper treats the digital design of a probabilistic energy equalizer for impulse radio (IR) UWB receiver in high data rate (100Mbps). The aim of this study is to bypass certain complex mathematical function as a chi-squared distribution and reduce the computational complexity of the equalizer for a low cost hardware implementation. As in Sub-MAP algorithm, the max* operation is investigated for complexity reduction and tested by computer simulation with fixed point data types under 802.15.3a channel models. The obtained re-sults prove that the complexity reduction involves a very slight algorithm deterioration and still meet the low-cost constraint of the implementation.
KeywordsImpulse Radio Ultra-WidebandProbabilistic Energy EqualizerInter-Symbol InterferenceChi-Squared
- L. Yang and G. B. Giannakis, “Ultra-wideband communica-tions: an idea whose time has come,” IEEE Signal Processing Magazine, Vol. 21, No. 6, pp. 26–54, November 2004.
- J. D. Choi and W. E. Stark, “Performance of ultra-wide- band communications with suboptimal receivers in multipath chan-nels,” IEEE Journal on Selected Areas in Communications, Vol. 20, No. 9, pp. 1754–1766, December 2002.
- R. Hoctor and H. Tomlinson, “Delay-hopped transmitted ref-erence RF communications,” IEEE Conference on Ul-tra-Wideband Systems and Technologies, pp. 265–269, May 2002.
- V. Lottici, L. Wu, and Z. Tian, “Inter-symbol interference mitigation in high-data-rate uwb systems,” IEEE International Conference on Communications, pp. 4299–4304, June 2007.
- Y. Zhang, H. Wu, Q. Zhang, and P. Zhang, “Interference miti-gation for coexistence of heterogeneous ultra-wide- band sys-tems”, EURASIP Journal on Wireless Communications and Networking, pp. 1–13, 2006.
- M. E. Sahin and H. Arslan, “Inter-symbol interfrence in high data rate uwb communications using energy detector receiv-ers,” IEEE International Conference on UWB, ICU, pp. 176–179, September 2005.
- S. Mekki, J. L. Danger, B. Miscopein, J. Schwoerer and J. J. Boutros, “Probabilistic equalizer for ultra-wideband energy detection,” IEEE 67th Vehicular Technology Conference (VTC), pp. 1108–1112, May 2008.
- M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, December 1972.
- J. A. Erfanian and S. Pasupathy, “Low-complexity paral-lel-structure symbol-by-symbol detection for ISI channels,” IEEE Pacific Rim Conf. Communications, Computers and Signal Processing, pp. 350–353, 1989.
- A. J. Viterbi, “An intuitive justification and a simplified im-plementation of the MAP decoder for convolutional codes,” IEEE Journal On Selected Areas In Communications, Vol. 16, No. 2, pp. 260–264, February 1998.
- H. Urkowitz, “Energy detection of unknown deterministic sig-nals,” Proceedings of the IEEE, Vol. 55, No. 4, pp. 523–531, April 1967.
- A. H. M. Ross, “Algorithm for calculating the noncentral chis-quare distribution,” IEEE Transactions on Information Theory, Vol. 45, No. 4, pp. 1327–1333, May 1999.
- N. C. Severo and M. Zelen, “Normal approximation to the chisquared and non-central F probability functions,” Biometrika, Vol. 47, No. 3/4, pp. 411–416, December 1960.