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 Combining OOK with PSM Modulation for Simple Transceiver of Orthogonal Pulse-Based TH-UWB Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 735410 11 pages doi 2008 735410 Research Article Combining OOK with PSM Modulation for Simple Transceiver of Orthogonal Pulse-Based TH-UWB Systems Sudhan Majhi 1 A. S. Madhukumar 1 A. B. Premkumar 1 and Paul Richardson2 1 School of Computer Engineering Nanyang Technological University Block-N4 Nanyang Avenue Singapore 639798 2 Electrical and Computer Engineering University of Michigan Dearborn MI 48128 USA Correspondence should be addressed to Sudhan Majhi sudh0001@ Received 21 November 2007 Revised 2 June 2008 Accepted 22 July 2008 Recommended by Weidong Xiang This paper describes a combined modulation scheme for time-hopping ultra-wideband TH-UWB radio systems by using on-off keying OOK and pulse-shape modulation PSM . A set of orthogonal pulses is used to represent bits in a symbol. These orthogonal pulses are transmitted simultaneously in the same pulse repetition interval resulting in a composite pulse. This scheme transmits the same number of bits by using fewer orthogonal pulses and receiver correlators than those used in PSM and biorthogonal PSM BPSM . The proposed scheme reduces multiple-access interference and multipulse interference considerably by using crosscorrelation properties of orthogonal pulses. Since each bit is individually received by OOK the proposed scheme requires less power. Hence it is applicable for energy constrained and low-cost TH-UWB systems. The bit-error-rate BER performance is analyzed both mathematically and through computer simulations under the different channel environments. The performance of this scheme is compared with that of existing PSM and its combined modulation schemes by using two sets of orthogonal pulses. Copyright 2008 Sudhan Majhi et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction
