上行多輸入多輸出之非正交多重接取系統下使用者選擇以及子載波配置;User Selection and Subcarrier Allocation for MIMO-NOMA Systems on Uplink

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Title:	上行多輸入多輸出之非正交多重接取系統下使用者選擇以及子載波配置;User Selection and Subcarrier Allocation for MIMO-NOMA Systems on Uplink
Authors:	宋世偉;Sung, Shih-Wei
Contributors:	通訊工程學系
Keywords:	多輸入多輸出;非正交多重接取;上行傳輸;強制歸零波束合成;連續干擾消除
Date:	2020-08-20
Issue Date:	2020-09-02 17:18:08 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文提出一個多輸入多輸出非正交多重接取(MIMO-NOMA)系統，搭配使用者選擇分組演算法、子載波配置演算法來提升上行傳輸中的總通道容量。在多天線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，比較每一群用戶在各個子載波的系統容量，接著分配子載波藉以提升整體系統容量。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天線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。;In this thesis, a Multi Input Multi Output Non-orthogonal multiple access (MIMO-NOMA) system is proposed to improve the total channel capacity in uplink transmission with user selection algorithm and subcarrier allocation algorithm. In multi antenna Non-orthogonal multiple access system, each subcarrier can be assigned to a cluster of users composed of multiple groups for data transmission. This thesis takes two users as a group and two groups as a cluster, compares the system capacity of each cluster of users in each subcarrier, and then allocates subcarriers to increase the overall system capacity. However, due to simultaneous transmission in multi antenna architecture, users in each group will also receive Inter-set Interference (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 (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 system. 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 user with the lower channel gain between two users in a group.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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