多用戶大規模多輸入多輸出系統中能量效率最佳化之低複雜度波束選擇法

Low Complexity Beam Selection for Energy Efficiency Optimization in Multi-User Massive MIMO Systems

林立峰(Li-Fong Lin)

指導教授 ： 李大嵩

國立交通大學/電機學院/電信工程系所/碩士(2016年)

摘要

在大規模多天線系統中，系統耗能情況會因射頻鏈路數上升而急速加劇，且基頻數位信號處理也變得較複雜，因此需要採用有較高效率的架構 。於本論文中，吾人將探討混和式波束成型搭配波束選擇法來最大化系統能量效率，提出一套新的傳輸機制和低複雜度波束選擇法，有效地選擇所使用的射頻鏈路個數，藉以最大化系統能量效率，並評估提出波束選擇法的計算複雜度。最後，由分析及電腦模擬結果顯示 吾人所提出的波束選擇法可獲得和窮盡搜尋法接近的能量效率，而其計算複雜度遠低於後者。

關鍵字

毫米波 ； 混和式波束成型 ； 多用戶多輸入多輸出 ； 能量效率

並列摘要

The high cost and power consumption of radio-frequency (RF) in massive MIMO systems render conventional architecture infeasible. Hence, new architectures with higher efficiency are needed. In this thesis, first, we introduce a new transmission scheme based on the architecture of hybrid precoding. Then, we develop low complexity beam selection algorithm to efficiently select the RF chain configurations for energy efficiency (EE) optimization. In addition, we also evaluate the computational complexity of the proposed beam selection algorithm. Finally, analysis and simulation results show that the proposed beam selection algorithm can reduce system complexity and achieve comparable energy efficiency compared with exhaustive search with much lower complexity.

並列關鍵字

mmWave ； hybrid precoding ； multiuser MIMO ； energy efficiency

參考文獻

[1] T. Bai, A. Alkhateeb, and R. W. Heath, “Coverage and Capacity of Millimeter-Wave Cellular Networks,” IEEE Commun. Mag., vol. 52, no. 9, pp. 70-77, Sept. 2014.

[2] Z. Pi and F. Khan, “An Introduction to Millimeter-Wave Mobile Broadband Systems,” IEEE Commun. Mag., vol. 49, no. 6, pp. 101-107, June 2014.

[3] T. Rappaport, “Millimeter-Wave Mobile Communications for 5G Cellular: It Will Work!” IEEE Access, vol. 1, pp. 335-349, May 2013.

[5] J. Zhang, L. Dai, S. Sun, and Z. Wang, “On the Spectral Efficiency of Massive MIMO Systems with Low-Resolution ADCs,” IEEE Commun. Lett., vol. 20, no. 5, pp. 842-845, May 2016.

[6] A. Alkhateeb, J. Mo, N. Gonzalez-Prelcic, and R. W. Heath, “MIMO Precoding and Combining Solutions for Millimeter-Wave Systems,” IEEE Commun. Mag., vol. 52, no. 12, pp. 122-131, Dec. 2014.