結合天線與零核空間選擇之多用戶多輸入單輸出之波束成型系統

Abstract

這篇論文中，我們考慮在多用戶多輸入單輸出系統下提出結合傳送天線選擇以及零核空間選擇的演算法，當系統環境中使用者較少的情況下，我們試著決定射频鏈路最佳的使用數量以及得到波束成型向量。從模擬結果，我們發現利用提出的演算法能夠得到最佳的射频鏈路數量以及改善系統的效能。此外，針對系統內的用戶只有兩位時，我們提出降低產生波束成型向量運算複雜度的方式。模擬結果顯示出，利用我們提出的方式能有效地減低計算波束成型向量所需的運算。同時，系統增益的效能能夠近乎原先的效能。

In this thesis, we propose an algorithm of combining transmit antenna and null basis selection for multiuser MISO system. We try to determine the optimal number of active RF chains and obtain beamforming vectors when the number of users is few in our system environment. From the simulation results, we find out that our proposed algorithm can obtain the optimal number of RF chains and improve the system performance. Furthermore, we propose a method for reducing computational complexity of generating beamforming vectors when number of users in system is two. The simulation results show that our proposed method can effectively reduce the computation on calculating beamforming vectors. At the same time, the system performance can be very close to the performance of proposed algorithm.