tailieunhanh - Báo cáo hóa học: " Research Article Joint Sensing Period and Transmission Time Optimization for Energy-Constrained Cognitive Radios"

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 Joint Sensing Period and Transmission Time Optimization for Energy-Constrained Cognitive Radios | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 818964 16 pages doi 2010 818964 Research Article Joint Sensing Period and Transmission Time Optimization for Energy-Constrained Cognitive Radios You Xu 1 Yin Sun 2 Yunzhou Li 2 Yifei Zhao 2 and Hongxing Zou1 1 Department of Automation Institute of Information Processing Tsinghua University Beijing 100084 China 2 The Wireless and Mobile Communication Technology R D Center Research Institute of Information Technology RIIT Tsinghua University Beijing 100084 China Correspondence should be addressed to You Xu xuyou02@ Received 5 March 2010 Accepted 28 July 2010 Academic Editor Athanasios Vasilakos Copyright 2010 You Xu 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. Under interference constraint and energy consumption constraint to maximize the channel utilization an opportunistic spectrum access OSA strategy for a slotted secondary user SU overlaying an unslotted ON OFF continuous time Markov chain CTMC modeled primary network is proposed. The OSA strategy is investigated via a cross-layer optimization approach with joint consideration of sensing period related to PHY layer and transmission time related to MAC layer which will affect both interference and energy consumption. Two access policies are investigated in this paper that is SU transmits only in OFF slots . the slots that the sensing results are OFF and transmits in both OFF slots and ON slots . The allocation of sensing period and transmission time for two access policies is investigated and analyzed by means of geometric methods. The closed form solutions are derived which show that SU should transmit in OFF slots as much as possible and that the proposed OSA strategy has low computational cost. Numerical results

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