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 Error Probability of DPPM UWB Systems over Nakagami Fading Channels with Receive Diversity | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 761369 9 pages doi 2011 761369 Research Article Error Probability of DPPM UWB Systems over Nakagami Fading Channels with Receive Diversity Hao Zhang 1 2 Ting-ting Lu 1 Jing-jing Wang 1 and T. Aaron Gulliver2 department of Electrical Engineering Ocean University of China Qingdao 266100 China department ofElectrical and Computer Engineering University of Victoria Victoria BC Canada V8W3P6 Correspondence should be addressed to Hao Zhang zhanghao@ Received 5 May 2010 Accepted 13 February 2011 Academic Editor T. D. Abhayapala Copyright 2011 Hao Zhang 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. We consider differential-pulse position modulation DPPM in an ultra wideband UWB communication system. A typical format for a DPPM signal in a UWB system is derived from that of a pulse position modulation PPM signal. The error probabilities of a UWB DPPM system with receive diversity over additive white Gaussian noise AWGN and Nakagami fading channels are derived. Both single-user and multiuser environments are considered. Performance results are presented which show that the frame error rate FER with DPPM is better than that with PPM and the FER performance can be improved significantly by receive diversity. 1. Introduction PPM has been used extensively in optical communication systems and is the modulation employed in the IEEE infrared physical layer standard 1 . However PPM adds complexity to the system since both slot and symbol synchronization are required at the receiver in order to demodulate the incoming signal 2 . Thus DPPM has been proposed as an alternative to PPM 3 4 . DPPM provides a higher transmission capacity by deleting redundant slots in a symbol. It does .
