感知網路之部份集中式動態頻譜擷取

Abstract

隨著既有與新興無線通訊服務的增加，對於頻寬的需求量也日漸提高，然而頻寬資源卻是有限的，對此問題大家已經開始尋求更有效的利用頻寬之方法。而感知無線電(Cognitive Radio)被視為一個可以有效的使用頻寬的重要技術

在本篇論文中，我們提出了一個部份集中式的感知無線電動態頻譜擷取(Partial- Centralized Cognitive Radio-Based Dynamic Spectrum Access)機制來提供感知無線電系統之上鏈路資料傳送。此機制控制了包含主動式頻譜資源偵測與上鏈路無線通訊資源分配。其主要目的是在固定頻段中提升傳輸量與頻譜的效益。在提出的機制中，我們針對WCDMA頻譜來做空閒頻譜偵測，根據這個系統的特性，我們設計了主動式空閒頻譜偵測程序。此外，我們提供了一個上鏈路無線通訊資源分配方法來有效的提升感知無線電系統的傳輸量。從模擬的結果可以顯示出來我們所提出的方法，可以提升傳輸量，並增進頻譜使用效率。

With the demand for additional bandwidth increasing due to existing and new services, both spectrum policy and communication technologists are seeking solutions for this apparent spectrum scarcity. The use of “cognitive radio” (CR) technology is viewed as the key technology to fully utilize the bandwidth. In this thesis, a partial centralized CR-based dynamic spectrum access (DSA) mechanism is proposed for CR networks uplink transmission. The goals of PCCR-based DSA algorithm are throughput maximization but without much more influence on WCDMA network. In the proposed PCCR-based DSA mechanism, the proactive white space detection provides the ability of CR users to execute the bandwidth request and adjust the access power adaptively. The white space could be verified by this process with a proactive manner. Then, the uplink resource management process provides the ability of CR BS to manage the available resource and to perform the resource allocation more efficiently.