TAILIEUCHUNG - Báo cáo hóa học: " Blind Synchronization in Asynchronous UWB Networks Based on the Transmit-Reference Scheme"

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: Blind Synchronization in Asynchronous UWB Networks Based on the Transmit-Reference Scheme | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 37952 Pages 1-14 DOI WCN 2006 37952 Blind Synchronization in Asynchronous UWB Networks Based on the Transmit-Reference Scheme Relja Djapic 1 Geert Leus 2 Alle-Jan van der Veen 2 and Antonio Trindade2 1 TNO-ICT Brassersplein 2 2612 CT Delft The Netherlands 2 Department of Electrical Engineering Delft Institute of Microelectronics and Submicron-technology DIMES Delft University of Technology Mekelweg 4 2628 CD Delft The Netherlands Received 15 September 2005 Revised 13 December 2006 Accepted 13 December 2006 Ultra-wideband UWB wireless communication systems are based on the transmission of extremely narrow pulses with a duration inferior to a nanosecond. The application of transmit reference TR to UWB systems allows to side-step channel estimation at the receiver with a tradeoff of the effective transmission bandwidth which is reduced by the usage of a reference pulse. Similar to CDMA systems different users can share the same available bandwidth by means of different spreading codes. This allows the receiver to separate users and to recover the timing information of the transmitted data packets. The nature of UWB transmissions short burst-like packets requires a fast synchronization algorithm that can accommodate several asynchronous users. Exploiting the fact that a shift in time corresponds to a phase rotation in the frequency domain a blind and computationally effcient synchronization algorithm that takes advantage of the shift invariance structure in the frequency domain is proposed in this paper. Integer and fractional delay estimations are considered along with a subsequent symbol estimation step. This results in a collision-avoiding multiuser algorithm readily applicable to a fast acquisition procedure in a UWB ad hoc network. Copyright 2006 Relja Djapic et al. This is an open access article distributed under the Creative Commons Attribution

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