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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: Research Article SmartMIMO: An Energy-Aware Adaptive MIMO-OFDM Radio Link Control for Next-Generation Wireless Local Area Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 98186 15 pages doi 10.1155 2007 98186 Research Article SmartMIMO An Energy-Aware Adaptive MIMO-OFDM Radio Link Control for Next-Generation Wireless Local Area Networks Bruno Bougard 1 2 Gregory Lenoir 1 Antoine Dejonghe 1 Liesbet Van der Perre 1 Francky Catthoor 1 2 and Wim Dehaene2 1IMEC Department of Nomadic Embedded Systems Kapeldreef 75 3001 Leuven Belgium 2K. U. Leuven Department of Electrical Engineering Katholieke Universiteit Leuven ESAT 3000 Leuven Belgium Received 15 November 2006 Revised 12 June 2007 Accepted 8 October 2007 Recommended by Monica Navarro Multiantenna systems and more particularly those operating on multiple input and multiple output MIMO channels are currently a must to improve wireless links spectrum efficiency and or robustness. There exists a fundamental tradeoff between potential spectrum efficiency and robustness increase. However multiantenna techniques also come with an overhead in silicon implementation area and power consumption due at least to the duplication of part of the transmitter and receiver radio frontends. Although the area overhead may be acceptable in view of the performance improvement low power consumption must be preserved for integration in nomadic devices. In this case it is the tradeoff between performance e.g. the net throughput on top of the medium access control layer and average power consumption that really matters. It has been shown that adaptive schemes were mandatory to avoid that multiantenna techniques hamper this system tradeoff. In this paper we derive smartMIMO an adaptive multiantenna approach which next to simply adapting the modulation and code rate as traditionally considered decides packet-per-packet depending on the MIMO channel state to use either space-division multiplexing increasing spectrum efficiency space-time coding increasing robustness or to stick to single-antenna .
