tailieunhanh - Báo cáo hóa học: "A new time-hopping/direct-sequence biorthogonal PPM UWB communication system"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : A new time-hopping/direct-sequence biorthogonal PPM UWB communication system | Shen et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 149 EURASIP Journal on . http content 2011 1 149 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access A new time-hopping direct-sequence biorthogonal PPM UWB communication system Ye-Shun Shen1 Fang-Biau Ueng2 and Li-Der Jeng3 Abstract In order to increase the capacity and diminish the multiple access interference MAI of an ultra-wideband UWB system we propose a new time-hopping direct-sequence TH DS scheme using N-ary biorthogonal pulse position modulation BPPM . In contrast with the conventional TH DS systems employing fixed partition of the TH slots Shen and Ueng Proceedings of the IEEE VTC-Spring 2010 the proposed TH DS system can put the start location of the TH slot in any one of Q available pulse positions within the frame. In the proposed TH DS system the modulation level of BPPM can be increased and the multiple access capability can be improved without degrading the system performance. Compared with the existing TH-UWB system that employs the whole frame to carry out TH process Shen et al. IEEE Trans. Veh. Technol. 59 2 742-753 2010 the proposed system has the merits of smooth power spectral density and low receiver complexity. In this article we also derive the probability distribution of MAI for each correlator s output of the proposed TH DS system based on the analytic characteristic function technique. In order to verify the correctness of the performance analyses and to demonstrate the effectiveness of the proposed TH DS system some simulation results are given in both the additive white Gaussian noise channel and the realistic UWB fading channels. From the simulation results we find that the proposed TH DS system outperforms the conventional TH DS scheme. Keywords characteristic function CF time-hopping TH ultra-wideband UWB multiple access interference MAI 1 Introduction Owing to the demand of short-range high-speed

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