Báo cáo hóa học: " Research Article Pre-Authentication Schemes for UMTS-WLAN Interworking"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Research Article Time Domain Equalizer Design Using Bit Error Rate Minimization for UWB Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 786291 11 pages doi 2009 786291 Research Article Time Domain Equalizer Design Using Bit Error Rate Minimization for UWB Systems Syed Imtiaz Husain 1 Jinhong Yuan 1 Jian Zhang 2 3 and R. K. Martin4 1 School of Electrical Engineering and Telecommunications University of New South Wales Sydney NSW 2052 Australia 2Australian National University Canberra ACT 0200 Australia 3 Canberra Research Laboratories National ICT Australia NICTA Canberra ACT 2601 Australia 4 The Air Force Institute of Technology Kettering OH-45433 USA Correspondence should be addressed to Syed Imtiaz Husain Received 28 January 2009 Accepted 27 March 2009 Recommended by Steve McLaughlin Ultra-wideband UWB communication systems occupy huge bandwidths with very low power spectral densities. This feature makes the UWB channels highly rich in resolvable multipaths. To exploit the temporal diversity the receiver is commonly implemented through a Rake. The aim to capture enough signal energy to maintain an acceptable output signal-to-noise ratio SNR dictates a very complicated Rake structure with a large number of fingers. Channel shortening or time domain equalizer TEQ can simplify the Rake receiver design by reducing the number of significant taps in the effective channel. In this paper we first derive the bit error rate BER of a multiuser and multipath UWB system in the presence of a TEQ at the receiver front end. This BER is then written in a form suitable for traditional optimization. We then present a TEQ design which minimizes the BER of the system to perform efficient channel shortening. The performance of the proposed algorithm is compared with some generic TEQ designs and other Rake structures in UWB channels. It is shown that the proposed algorithm maintains a lower BER along with efficiently shortening the channel. Copyright 2009 Syed Imtiaz Husain et

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