TAILIEUCHUNG - Báo cáo hóa học: " Research Article Design and Performance of Cyclic Delay Diversity in UWB-OFDM Systems"

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 Article Design and Performance of Cyclic Delay Diversity in UWB-OFDM Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 541478 8 pages doi 2008 541478 Research Article Design and Performance of Cyclic Delay Diversity in UWB-OFDM Systems Poramate Tarasak Khiam-Boon Png Xiaoming Peng and Francois Chin Institute for Infocomm Research 21 Heng Mui Keng Terrace Singapore 119613 Correspondence should be addressed to Poramate Tarasak ptarasak@ Received 14 June 2007 Revised 20 October 2007 Accepted 9 December 2007 Recommended by Stefan Kaiser This paper addresses cyclic delay diversity CDD in an ultra-wideband communication system based on orthogonal frequency division multiplexing OFDM technique. Symbol error rate and outage probability have been derived. It is shown that with only two transmit antennas CDD effectively improves SER performance and reduces outage probability significantly especially when the channel delay spread is short. Both simulation and analytical results agree well in all considered cases. The selection of delay times for CDD is also addressed for some special cases. Copyright 2008 Poramate Tarasak et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Wireless personal area network WPAN using ultra-wideband UWB communication has received great interest due to its capability of transmitting very high bit rate over short range. Conventional UWB technique transmits very short pulses in a time-hopping manner with low-duty cycle 1 . In addition to high bit rate transmission due to its short-pulse structure UWB also has high precision localization capability. However pulse-based UWB system can be very difficult to implement since it requires analog-to-digital and digital-to-analog converters with very high sampling rate when very high-transmission rate is needed.

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