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    政大機構典藏 > 理學院 > 資訊科學系 > 期刊論文 >  Item 140.119/110581


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    題名: Beam Configuration and Client Association for Access Points Using Switched Beam Antennas
    作者: 郭桐惟
    Lin, Kate Ching-Ju;Kuo, Tung-Wei;Yan, Pei-Jiun;Cheng, Wan-Jie;Jeng, Shyh-Kang
    貢獻者: 資科系
    關鍵詞: Switches, Adaptive arrays, Wireless LAN, Algorithm design and analysis, Transmitting antennas
    日期: 2016-09
    上傳時間: 2017-06-29 09:43:48 (UTC+8)
    摘要: Unlike conventional omnidirectional antennas, switched beam antennas exploit antenna arrays and signal processing techniques to focus energy in a specific beam-width and orientation. Recent research has shown that access points of a WLAN can exploit such switched beam antennas to increase the overall network capacity. The achievable sum rate of a WLAN with switch beam antennas is however mainly determined by how each AP selects its beam, including the orientation and width, and how each client associates with a proper AP. The goal of this paper is to solve the Joint Beam configuration and Client association (JBC) problem such that the sum rate of all clients in the network can be maximized. We formulate the JBC problem as a mixed integer linear programming model, and propose a 2-approximation algorithm to solve it. Our proposed algorithm has two distinctive properties: 1) it can be realized as a distributed protocol that allows the APs to configure their beams without the help of a central coordinator, and 2) it can be generally applied both in specific scenarios, where exact client locations are known, and in uncertain scenarios, where only geographic client distribution is given. Finally, we adjust the sum-rate maximization algorithm to the throughput maximization algorithm, which further takes medium sharing among clients into account. The simulation results show that the proposed algorithm outperforms both WLANs using omnidirectional antennas and other heuristics using switched beam antennas.
    關聯: IEEE Transactions on Mobile Computing, 15(9), 2179-2192
    資料類型: article
    DOI: http://dx.doi.org/10.1109/TMC.2015.2492562
    顯示於類別:[資訊科學系] 期刊論文

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