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 Frame-Aggregated Link Adaptation Protocol for Next Generation Wireless Local Area Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 164651 12 pages doi 2010 164651 Research Article Frame-Aggregated Link Adaptation Protocol for Next Generation Wireless Local Area Networks Kai-Ten Feng Po-Tai Lin and Wen-Jiunn Liu Department of Electrical Engineering National Chiao Tung University Hsinchu 300 Taiwan Correspondence should be addressed to Kai-Ten Feng ktfeng@ Received 4 August 2009 Revised 11 February 2010 Accepted 10 May 2010 Academic Editor Ashish Pandharipande Copyright 2010 Kai-Ten Feng 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. The performance of wireless networks is affected by channel conditions. Link Adaptation techniques have been proposed to improve the degraded network performance by adjusting the design parameters for example the modulation and coding schemes in order to adapt to the dynamically changing channel conditions. Furthermore due to the advancement of the IEEE standard the network goodput can be enhanced with the exploitation of its frame aggregation schemes. However none of the existing link adaption algorithms are designed to consider the feasible number of aggregated frames that should be utilized for channel-changing environments. In this paper a frame-aggregated link adaptation FALA protocol is proposed to dynamically adjust system parameters in order to improve the network goodput under varying channel conditions. For the purpose of maximizing network goodput both the optimal frame payload size and the modulation and coding schemes are jointly obtained according to the signal-to-noise ratio under specific channel conditions. The performance evaluation is conducted and compared to the existing link adaption protocols via simulations. The simulation results .
