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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: High-Speed Turbo-TCM-Coded Orthogonal Frequency-Division Multiplexing Ultra-Wideband Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 91329 Pages 1-12 DOI 10.1155 WCN 2006 91329 High-Speed Turbo-TCM-Coded Orthogonal Frequency-Division Multiplexing Ultra-Wideband Systems Yanxia Wang Libo Yang and Lei Wei School of Electrical Engineering and Computer Science University of Central Florida Orlando FL 32816 USA Received 30 August 2005 Revised 15 February 2006 Accepted 16 February 2006 One of the UWB proposals in the IEEE P802.15 WPAN project is to use a multiband orthogonal frequency-division multiplexing OFDM system and punctured convolutional codes for UWB channels supporting a data rate up to 480 Mbps. In this paper we improve the proposed system using turbo TCM with QAM constellation for higher data rate transmission. We construct a punctured parity-concatenated trellis codes in which a TCM code is used as the inner code and a simple parity-check code is employed as the outer code. The result shows that the system can offer a much higher spectral efficiency for example 1.2 Gbps which is 2.5 times higher than the proposed system. We identity several essential requirements to achieve the high rate transmission for example frequency and time diversity and multilevel error protection. Results are confirmed by density evolution. Copyright 2006 Yanxia Wang 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. 1. INTRODUCTION In recent years ultra-wideband UWB communications has received great interest from both the academic community and industry. Using extremely wide transmission bandwidths the UWB signal has the potential for improving the ability to accurately measure position location and range immunity to significant fading high multiple-access capability extremely high data rate at short ranges and easier material penetrations
