LTE-A 下行蜂巢系統改善SINR方法之研究

Abstract

在未來會有愈來愈多的裝置需要共享頻譜資源，傳統上利用分割技術來分配頻譜資源的方式，漸漸的無法滿足所有的需求。在此情況之下，頻譜複用率為一的情況將無法避免；因此如何利用合作式通訊的優點來達到頻譜複用率為一的目標是近年來很重要的議題。在前瞻長期發展(LTE-A)方案中，為了提升整體服務品質而設計了許多機制，諸如：傳輸功率控制、切換波束式天線、協調式多點傳輸機制以及小細胞傳輸等等。本論文逐一的作介紹並且定環境背景模擬其成效。此外，我們將其中一些演算法作結合並模擬驗證其系統效益之提升。我們的研究結果可以作為未來如何在頻譜複用率為一的情況下進一步改善SINR方法之參考。

In the future cellular system, more and more user equipments (UE) need to share the common frequency resources. Previous techniques for allocating different frequency bands to different cells cannot meet the ever-increasing users’ demands. The requirement of frequency reuse one is inevitable. Thus, how to exploit the advantage of cooperative communication to satisfy the cell structure of reuse one is an important issue. In order to improve total QoS performance LTE-A specifies methods such as transmit power control, switched beam antenna, coordinated multi-point transmission, and small cell transmission, etc. This thesis first introduces these methods and shows the results of our computer simulations. Besides, we combine some of the methods and show how it works and its performance is verified through computer simulations. Due to the performance improvements, Our methods provide alternative solutions to the frequency reuse one scenario.