隨著通訊系統的發展，對於系統的速率要求也與日俱增。近年來，在下行鏈路的部分，聯合傳輸技術被用來增強通道容量。因此，我們審視了有關聯合傳輸的文獻，並從中了解到聯合傳輸的優勢。另外，隨著通訊電路的演進，非正交多址技術(NOMA)成為了下一代可行的多址方案。在本論文中，我們將三種非正交多址技術與聯合傳輸技術進行配合。透過非正交多址技術可以使頻率資源進行複用。而聯合傳輸則提供了用戶訊號的分集增益。因此，我們將著重在頻譜利用效率上的分析，並從中探討不同的非正交多址技術在聯合傳輸的場景下的性能表現。

With the development of communications systems, we will also increase the rate for system requirements. In recent years, joint transmission technique is used to enhance channel capacity in downlink scenario. Therefore, we survey literature about joint transmission, and understanding of the benefits from joint transmission. Moreover, with the evolution of communication circuits, non-orthogonal multiple access (NOMA) technology has become a next generation multiple access scheme. In this thesis, we will cooperate three kinds of NOMA technology and joint transmission. The frequency resources can be multiplexed by NOMA technology, and joint transmission support the diversity gain. Therefore, we will focus on
the analysis of spectrum efficiency, and explore different NOMA in joint transmission. In the uplink section, we use NOMA technology in small cell.

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