- 學位論文
下行傳輸多用戶多重輸入輸出通訊系統波束選擇演算法之研究
A Research on Beam Selection Algorithms for Downlink MU-MIMO Systems
摘要
毫米波(millimeter-wave, mm-wave)通訊系統為最近幾年的趨勢，其具有波長短且頻寬大的優勢，但因為通道衰減較為嚴重，因此學者提出結合大型陣列天線來克服此先天之限制。但由於射頻鏈路造價十分昂貴，所以許多研究著重於開發新技術以降低硬體實現上的複雜度，本論文探討在毫米波下波束域(beam domain)波束選擇信號處理的相關技術，相較於傳統在天線域(spatial domain)進行信號處理的系統來說，我們所提出的技術能夠更有效地利用由通道有限散射(limited scattering)所造成的稀疏特性，並且能以較低的複雜度達到接近最佳和率表現之通訊系統。
並列摘要
Millimeter wave(mm-wave) communication has been a hot research area recently. Due to the strong path loss in mm-wave channels, researchers have proposed to combine mm-wave communications with massive MIMO techniques. However, conventional fully-digital MIMO transceiver design implemented in the antenna-domain is not feasible as it requires a dedicated RF chain connected to each antenna. Since RF chains are of great implementation cost and hence new techniques are required to reduce the implementation cost. In this thesis, we focus on beam selection techniques in order to exploit the limited scattered characteristic of mm-wave channel more effectively. Simulation results show that our proposed beam selection algorithm can achieve near-optimal sum-rate performance while exhibiting moderate computation complexity compared to other benchmark algorithms.