多載波分碼多重進接系統之調適性位元、功率和展頻因子配置機制; Adaptive Bit, Power and Spreading Factor Allocation Algorithms for Multi-carrier CDMA Communication Systems on Reverse Link

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Title:	多載波分碼多重進接系統之調適性位元、功率和展頻因子配置機制;Adaptive Bit, Power and Spreading Factor Allocation Algorithms for Multi-carrier CDMA Communication Systems on Reverse Link
Authors:	王士瑋;Shih-Wei Wang
Contributors:	通訊工程研究所
Keywords:	動態展頻因子參數配置;動態位元分配演算法;多載波分碼多重進接系統;干擾連續消除接收器;MC-CDMA;SIC;adaptive modulation
Date:	2005-06-30
Issue Date:	2009-09-22 11:17:21 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	在本文中，我們對於多用戶上鏈傳送的多載波分碼多重進接存取系統搭配干擾連續消除接收器，提出兩種不同的即時的位元、功率和展頻因子配置演算法。由於使用者之間會彼此干擾，而唯有基地台才知道全部使用者的子載波增益，故此配置演算法是在基地台使用，再將各個使用者所需要傳送的位元、功率和展頻因子告知各個使用者。而在本文中，假設基地台已知全部使用者的子載波增益，提出的配置演算法一個是滿足所要求的特定位元錯誤率以及每位使用者功率為一固定值的條件下，將資料傳輸率最大化，另一個為滿足所要求的特定位元錯誤率以及每位使用者相同的固定資料傳輸率的條件下，將所需求的功率最小化。在這兩個演算法中，結合動態位元分配演算法和動態展頻因子參數配置的調適，來決定位元、功率和展頻因子的配置。藉由模擬結果可知，所提出的兩種方法一個在資料傳輸率方面、另一個在功率需求方面，都比一般固定調變方式的系統提供了更好的效能。 By using the successive interference cancellation (SIC) receiver, we can simplify the situation, the power of users are affected mutually. Based on the simplification, we propose bit, power and spreading factor (SF) allocation algorithms for Multi-carrier CDMA (MC-CDMA) communication systems in uplink transmission. Assuming that the channel estimation of all sub-carriers of all users are perfect, one of the proposed algorithms tries to maximize the sum of data rates of the users in the system while satisfying the power and bit error rate (BER) constraints of each user, and the other algorithm tries to minimize the required transmission power while satisfying the rate requirement and BER constraint of each user. These novel algorithms determine bit, power and SF allocation simultaneously. The proposed schemes offer better performance than the fixed SF and modulation system as demonstrated in the simulation results.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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