非正交多重接取（NOMA）技術是有機會被5G系統採用的技術之一。它允許具有不同通道狀況的多個用戶經由功率或是編碼分成不同等級來共享相同（時間/頻率）資源。在NOMA系統中，連續干擾消除（SIC）技術是接收端解碼信號的關鍵。為了成功將信號區分並解出來，用戶之間的信號功率必須不同。因此各種功率分配方案被提出來。在本論文中，我們在IEEE 802.11飽和系統上提出一個新穎的上行鏈路NOMA功率分配方案，希望提高系統性能。根據IEEE 802.11標準來了解控制發射功率的步驟和流程，基地台會透過相關使用者所傳送的請求幀得到發射功率等訊息，並把相關用戶的發射功率資訊做為演算法的輸入來計算出發射功率限制。除此之外我們使用注水演算法來作調整去增加SIC解出訊號的機會。最後我們將傳統IEEE 802.11分散式協調功能基本機制和以NOMA為技術背景使用在飽和系統上提出的方法進行了比較。

Non-Orthogonal Multiple Access (NOMA) is one of the promising techniques proposed for 5G systems. It allows multiple users with different channel coefficients to share the same (time/frequency) resources by allocating several levels of (power/code) to them. In the NOMA system, the Successive Interference Cancellation (SIC) is the key for the receiver to decode the signal. To successfully distinguish between signals and decode, the signal power between users must be different. Therefore, various transmit power allocation schemes are proposed. In this thesis, a novel uplink NOMA power allocation scheme is intended to uplink non-orthogonal multiple access (NOMA) scenarios on IEEE 802.11 saturation system, aiming to improve system performance. According to the transmit power control procedure which is established in IEEE 802.11 standard, the AP obtains power information in the request frame transmitted by the associated users. An AP may use the transmit power capability of associated users as an input into the algorithm and output the transmit power constraint. We also discuss the water-filling algorithm and add new elements to increase the chances of SIC decodes signals. Finally, we compare the performance of traditional IEEE 802.11 distributed coordination function basic mechanism and NOMA-based with the proposed method on the saturation system.

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