近年來，聯合傳輸技術被提出且認為是改進通道容量以及能量效率的有效方式。我們審視了與聯合傳輸有關的能量效益的論文。在先前的論文中已經提出了關於於聯合傳輸的能量效益最佳化問題。在本論文中，我們制訂並解決了聯合傳輸能量效益最佳化問題， 並且考慮了非同步聯合傳輸對性能的影響。我們的最佳化目標是小型基地台和一般蜂巢式網路用戶在最佳配對下的整體系統能量效益。在每個迴圈內，最佳化問題分為功率分配階段和用戶選擇階段。在功率分配階段，可以將目標函數轉換為近似的凹函數， 透過凸優化算法尋求最優功率。在用戶選擇階段，由於約束矩陣可以被證明是全單模矩陣， 因此整數規劃問題可以被鬆弛成線性規劃問題並且可以透過有效且具有效率的的單純形法來解決。

Joint Transmission (JT) has proposed as an effective method to increase channel capacity. We survey papers about EE related to joint transmission. The EE optimization problem of joint transmission has proposed in previous papers. In this thesis, we develop and solve the EE optimization problem for joint transmission, and then we consider the impact of asynchronous joint transmission on performance. Our optimization goal is the overall energy efficiency under the best pairing between the small base station and the UE. In each iteration, the optimization problem is divided into power allocate stage and UE choose stage. In the power allocate stage, the objective functions are transformed into the approximation concave function, we can use convex optimization method to solve. In UE choose the stage, since the constraint matrix can be proved as a totally unimodular (TU) matrix, the integer programming (IP) problem is relaxed to a linear programming (LP) problem
and can be solved by the effective and efficient simplex.

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