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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8334


    Title: 雙躍進合作通訊在固定式無線寬頻接取系統之研究;Study of Dual-Hop Cooperative Communications on Fixed Broadband Wireless Access Systems
    Authors: 周高鵬;Kao-Peng Chou
    Contributors: 通訊工程研究所
    Keywords: 合作式通訊;雙躍進;固定式無線寬頻;區域多點分配服務系統;cooperative communications;dual hop;LMDS;relay
    Date: 2009-06-23
    Issue Date: 2009-09-22 11:23:17 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 區域多點分配系統是一種採用蜂巢式細胞架構之固定式無線寬頻接取技術的通訊系統,可以提供高速雙向傳輸服務。由於系統規格的物理特性,通訊受到細胞同頻干擾和雨衰的影響。在這篇論文中,引入雙躍式合作性通訊技術來改善通訊品質和系統效能。通訊涵蓋率、頻譜效益是我們觀察通訊品質和系統效能的觀測參數。首先,我們先觀察在最佳合作式通訊架構下抗干擾的表現,並視為效能最佳可達界限。由於最佳化的系統架構在傳遞器的使用量上過於龐大,在實現上有成本過高的缺點。為了克服成本上的考量,我們在這篇論文中提出了兩個新的架構,”單環跳躍傳遞” 和”雙環跳躍傳遞”。在單環跳躍傳遞上,我們專注在通訊涵蓋率的考量,利用較少的傳遞器在惡劣的通訊環境下達到期望的通訊涵蓋率。而雙環跳躍傳遞則是在單環跳躍傳遞的架構下多架設了一環傳遞器,目的是補償另一環傳遞效率較低的使用者區塊,進而達到較高的整體系統效益。 LMDS is a broadband wireless access technology, which provides high data rates communications. Caused by the physic nature, LMDS suffered from inter-cell interference and rain attenuation. In this thesis, we involve the dual-hop cooperative communication system against those effects. First we observe the optimal case which every subscriber has a corresponding relay at the optimal position. The performance be improved but the architecture is not practical using too many relays. So we invent two practical relaying architectures, namely “simplex ring relaying” and “duplex ring relaying”. In the case of simplex ring relaying, we focus on optimize the coverage ratio. Then in duplex ring relaying, we enhance the simplex ring relaying by add another ring relays inside the first ring to maximize the spectrum efficiency. Then we compare those architectures with conventional LMDS.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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