由於毫米波通道有著較高的功率衰減的問題,所以許多研究者提出結合配備 大型天線陣列之毫米波系統來克服。在傳統多輸入多輸出系統中,每一根天線需 配置一個射頻鏈,因此當天線數目多的時候會使得射頻鏈的成本與功率消耗太 高。混合射頻基頻系統架構藉由在基頻與射頻分開設計預編碼能夠有效地減輕這 個問題,因此是當前毫米波通訊系統的研究重點。本篇論文考慮一個新式的混合 射頻基頻系統架構,並且對這個系統架構提出了三種演算法。模擬指出我們的設 計能在複雜度與頻譜效益表現上達到不錯的取捨。
Due to the high path loss of millimeter wave (mmWave) channels, mmWave communication in combination of massive MIMO technique has been proposed. In traditional fully-digital MIMO system, every antenna connects to one RF chain, and hence the hardware complexity and power dissipation can be formidable when massive number of antennas are implemented. Hybrid architecture, on the other hand overcomes this problem by using fewer RF chains and lower cost phase-shifters for implementation. This thesis considers a new hybrid architecture in mmWave systems, and then proposes three efficient designs for this new hybrid architecture. Simulation results demonstrate that our proposed algorithms can achieve good performance-complexity tradeoffs.
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