Device-to-device (D2D) 通訊概念的提出是用於未來有效改善蜂巢網路的負載。然而，一般的D2D通訊，從發送端裝置至接收端裝置會建立一個直接的通訊鏈路來通訊，跟傳統的行動通訊需要經由基地台的有所區隔，而這一段D2D通訊的直接通訊鏈路將會受到兩裝置間的距離和鏈路品質的影響而造成通訊品質上的限制。在先前的研究與論文中，提出了一種用於彌補直接的D2D通訊品質上的限制與不足，是為中繼站來輔助轉傳D2D的通訊架構，藉由此種通訊的方法能夠解決裝置間的問題而造成的通訊品質上的限制，進而增加LTE-A網路的系統容量。

在此篇論文我們透設計另外一種模式的傳送方式，相較於藉由中繼站與直接傳輸的模式，此種方法藉由Cooperative Communication Technologies (合作式通訊技術) 去達到終端得到了Diversity gain (分集增益) 來始終端可以得到更好的訊號品質，而在終端也利用Combining (合併) 的演算法的分析來得到最大的分集增益使訊號最好。從中我們也會將三種不同的傳輸模式分別詳細討論去介紹，再利用一種最佳功率分配去使復用通道達到最高的傳輸速率。最後藉由幾種不同的環境設置去模擬分析，利用結果來說明各種環境所造成的通道影響與比較功率分配與上述所提到的三種方式優劣。藉此證明可以顯現出通道訊號品質的改善，也使LTE-A系統容量的增加。

Device-to-device (D2D) communications have been proposed as an effective way for trafficoff loading in futuristic cellular systems. However, it establishes a direct link between a source and destination in normal D2D communications which is different from traditional cellular communications ,and the link limits advantages brought in by D2D communications due to a long separation distance or poor link quality between the source and destination user equipments (UEs). In previous researches and papers, relay-assisted D2D communication is proposed as a supplement to direct D2D communications. By using this relay-assisted D2D communication architecture, it will solve the long separation distance or poor link quality problems and enhance traffic offloading capacity of LTE-A systems.

In this thesis, we aim to design another transmission mode for D2D communications. We utilize cooperative communication technologies to obtain diversity gain to make the link quality better in the destination ,and the combining algorithms also can make the diversity gain maximum in order to obtain better link quality. Then, we will introduce the three different transmission mode in detail, and we utilize a optimal power allocation to maximize the joint channel capacity. Finally, we will have some different scenarios to simulate and analyze, and utilizing the simulation results to explain the affects to the reuse channel and comparing the advantage of three different modes with optimal power allocation. Validating the overall performance of the proposed methods using in D2D communications scheme and the enhancement of traffic offloading capacity of LTE-A systems.

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