分群合作式感知網路頻譜感測和通道存取之研究

Abstract

近年來，因為無線通信的快速發展造成頻譜資源日益缺少，大部分頻譜資源被分配到不 同通訊運用當中。但因為這些所分配頻譜資源使用的效率不佳，因此有人提出感知無線 電 這個可以將頻譜資源重複使用的想法 因為主要使用者能優先存取通道，感知使用者 的傳輸必須不能干擾到主要使用者。因此，頻譜感測是實現感知網路最關鍵的功能。 於本論文中，我們著重於分群架構合作式頻譜感測並且考慮多使用者通道存取機制。多 使用者通道存取機制同時考量感測階段以提升整體系統的吞吐量。

In recent years, a variety of rapid development of wireless communication has network resulted in the growing shortage of spectrum resources. Most of the wireless spectrum resources are allocated to different independent fixed-type applications. However, some literature shows that the allocated spectrums are low utilization. Therefore, Cognitive Radio was proposed which contains the concept of spectrum reuse. In CR network, the primary user has the higher priority to access the communication channels. Therefore the transmission of the cognitive users must not cause the interferences to the PUs. Consequently, spectrum sensing is the most critical function for realizing the idea of cognitive network. In order to improve the efficiency of spectrum utilization, we focus on cluster based CSS. And we consider multi-user channel access mechanism, which is to take both the sensing stage into considerations to improve the overall system throughput.