論文摘要

本論文提出一個多使用者多載波非正交多重接取系統(Multiuser Multicarrier NOMA)，搭配使用者選擇分組演算法、子載波配置演算法及位元配置演算法來降低整體系統的傳輸功率。在多使用者多載波非正交多重接取系統中，每一個子載波可以分配給一群由多組使用者組成的用戶們進行資料傳輸。本論文以兩個使用者為一組，兩個組為一群，透過使用比較正交分頻多工系統中單一使用者更低功率的調變方式進行資料傳輸以藉此降低傳輸所需的功率。然而，因為在多天線架構下同時進行傳輸，各組使用者亦會接收到來自其他天線的傳輸干擾(Inter-set Interference)；再者，由於多使用者共用同一段頻帶，即共享同一個子載波作資料傳輸，故會產生同頻帶之間的干擾(Co-channel Interference)，而這些干擾類型也是多使用者多載波非正交多重接取系統所主要需克服的難題。故為了因應上述干擾，論文中採用Zero-forcing Beamforming(ZFBF)以消除來自其他天線所傳出的干擾，同時搭配連續干擾消除技術(SIC)以消除來自傳輸功率較大的使用者之干擾。

Abstract

In this thesis, a multiuser multicarrier non-orthogonal multiple access system is proposed to reduce the total required transmit power in uplink transmission with user selection, subcarrier allocation, and bit allocation algorithms. In multiuser multicarrier non-orthogonal multiple access systems, each subcarrier can be assigned to a cluster of users composed of multiple sets for data transmission. This thesis takes two users as a set and two sets as a cluster; the system compares the required transmit power of each cluster of users in each subcarrier, and then allocates subcarriers to reduce the overall system required transmit power. However, due to simultaneous transmission in multi antenna architecture, users in each set will also receive inter-set interference from other antennas. Moreover, since multiple users share the same frequency band, that is to say, they share the same subcarrier for data transmission, so there will be co-channel interference in the same frequency band. These types of interference are also the main problems to be overcome in multi-antenna non-orthogonal multiple access systems. Therefore, in order to cope with the above-mentioned interference, zero-forcing beamforming (ZFBF) is used to eliminate the interference from other antennas, and the successive interference cancellation (SIC) is used to eliminate the interference from the weak set user with the lower channel gain between two users in a set.

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