TAILIEUCHUNG - Báo cáo hóa học: " Research Article Rate and Power Allocation for Discrete-Rate Link Adaptation"

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 Rate and Power Allocation for Discrete-Rate Link Adaptation | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 394124 11 pages doi 2008 394124 Research Article Rate and Power Allocation for Discrete-Rate Link Adaptation Anders Gjendemsj0 1 Geir E. 0ien 1 Henrik Holm 1 2 Mohamed-Slim Alouini 3 David Gesbert 4 Kjell J. Hole 5 and Pal Orten6 7 1 Department of Electronics and Telecommunications Norwegian University of Science and Technology NTNU 7491 Trondheim Norway 2 Honeywell Laboratories Minneapolis MN 55418 USA 3 Department of Electrical and Computer Engineering Texas A M University at Qatar P. O. Box 23874 Doha Qatar 4 Institut Eurecom 06904 Sophia-Antipolis France 5 Department of Informatics University of Bergen 5020 Bergen Norway 6Thrane Thrane 1375 Billingstad Norway 7 University Graduate Center 2027 Oslo Norway Correspondence should be addressed to Anders Gjendemsjo gjendems@ Received 17 July 2007 Revised 24 October 2007 Accepted 25 December 2007 Recommended by George K. Karagiannidis Link adaptation in particular adaptive coded modulation ACM is a promising tool for bandwidth-efficient transmission in a fading environment. The main motivation behind employing ACM schemes is to improve the spectral efficiency of wireless communication systems. In this paper using a finite number of capacity achieving component codes we propose new transmission schemes employing constant power transmission as well as discrete- and continuous-power adaptation for slowly varying flatfading channels. We show that the proposed transmission schemes can achieve throughputs close to the Shannon limits of flatfading channels using only a small number of codes. Specifically using a fully discrete scheme with just four codes each associated with four power levels we achieve a spectral efficiency within 1 dB of the continuous-rate continuous-power Shannon capacity. Furthermore when restricted to a fixed number of codes the introduction of power adaptation has .

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