tailieunhanh - Báo cáo hóa học: " Random Sign Repetition Time-Hopping UWB with Multiuser Detection"

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: Random Sign Repetition Time-Hopping UWB with Multiuser Detection | EURASIP Journal on Wireless Communications and Networking 2005 4 590-598 2005 Jinho Choi Random Sign Repetition Time-Hopping UWB with Multiuser Detection Jinho Choi School of Electrical Engineering and Telecommunications Faculty of Engineering The University of New South Wales UNSW Sydney NSW 2052 Australia Email j. choi@unsw. Received 6 September 2004 Revised 2 May 2005 Recommended for Publication by Tho Le-Ngoc A modified time-hopping TH ultra-wideband UWB called the random sign repetition TH-UWB is considered to improve the performance of the minimum mean square error MMSE multiuser detector. We show that the increase of dimension or the number of repetitions is important to improve the performance of the MMSE detector in the random sign repetition TH-UWB for either coded or uncoded signals. Keywords and phrases ultra-wideband multiuser detection performance analysis. 1. INTRODUCTION Recently ultra-wideband UWB technology which uses a very short pulse for wireless digital communications has been extensively investigated due to its significance that enables to transmit data sequences at a very high rate. Although the propagation range of UWB signals is short about ten meters 1 its impact on wireless home networks can be quite significant. Apart from the support of a high data rate UWB can also provide multiple access so that multiple transmitters can be active simultaneously 2 and construct wireless networks 3 . A conventional UWB uses time-hopping TH sequences for multiple access and pulse-position modulation PPM for signaling 2 . There are other variations of UWB. In 4 an UWB based on direct sequence spreading has been considered and compared to the conventional TH-UWB. Due to the cochannel interference from other UWB transmitters the performance is generally limited by the cochannel interference. In 5 6 a characterization of the cochannel interference and performance analysis for the conventional TH-UWB are discussed. Since UWB systems suffer from the .

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