tailieunhanh - Báo cáo hóa học: " Research Article Pulse Interval Modulation for Ultra-High Speed IR-UWB Communications 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 Pulse Interval Modulation for Ultra-High Speed IR-UWB Communications Systems | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 658451 8 pages doi 2010 658451 Research Article Pulse Interval Modulation for Ultra-High Speed IR-UWB Communications Systems Marijan Herceg Tomislav Svedek and Tomislav Matic Department of Communication Faculty of Electrical Engineering University ofOsijek Kneza Trpimira 2b 31000 Osijek Croatia Correspondence should be addressed to Marijan Herceg Received 16 February 2010 Revised 6 May 2010 Accepted 21 July 2010 Academic Editor Jacques Palicot Copyright 2010 Marijan Herceg 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. This paper analyzes performances of the Pulse Interval Modulation PIM scheme for impulse radio ultra-wideband IR-UWB communication systems. Due to the PIM anisochronous nature a tap delay line TDL coded division multiple access CDMA scheme based on strict optical orthogonal codes SOOC is proposed. This scheme is suitable for multiuser high-speed data asynchronous transmission applications because the average symbol length is shorter than in Pulse Position Modulation PPM schemes and it needs only chip synchronization. The error probability over the additive white Gaussian noise AWGN channel is derived in the single- and multi-user environment and compared with other modulation schemes. 1. Introduction Trends in modern communication systems place high demands on low power consumption high-speed transmission and anti-interference characteristics. Therefore impulse radio ultra-wideband IR-UWB 1 systems have recently gained increased popularity. Since IR-UWB symbols are transmitted by short pulses 2ns energy has spread over the frequency bands of up to 10 GHz. These pulses have to follow strict regulations concerning power and spectrum .

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