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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/799


    Title: 波束域下多用戶多輸入多輸出系統之單一用戶檢測干擾抑制合併接收機;Interference Rejection and Combining (IRC) Receiver with single-user detection for MU-MIMO Systems over beam space
    Authors: 李保成;LI, BAO-CHENG
    Contributors: 通訊工程研究所
    Keywords: 干擾抑制合併接收機;共變異數矩陣估測法;選擇性通道估測法;單一用戶檢測;interference rejection combining receiver;selective channel estimation;covariance matrix estimation;single-user detection
    Date: 2017
    Issue Date: 2019-07-17 10:47:54 (UTC+8)
    Publisher: 通訊工程研究所
    Abstract: 多輸入多輸出技術之發展已從單用戶(SU-MIMO) 系統邁入多用戶(MU-MIMO)系統階段,多用戶多輸入多輸出系統能在同一時間中,服務多個用戶,從而提升頻譜效益。然而隨著用戶數增加,接收機的複雜度也會隨之提升,因此對於MU-MIMO接收機來說,低複雜度接收機為一重要議題。另外由於用戶同時進行訊號傳輸而產生的同通道間之干擾(co-channel in addition interference),包含同基地台至其他用戶之干擾,以及來自不同基地台之訊號干擾。針對這些問題,本論文在波束域中(bean domain)採用干擾抑制合併(interference rejection combining, IRC)接收機,設計上需要知道服務用戶通道資訊及接收訊號之共變異數矩陣,本論文中會介紹如何去應對其難題。其優點在於可以對同通道間之干擾壓抑,且根據波束通道之功率集中特性,透過用戶分群及波束選擇可以有效降低接收機複雜度。而其缺點在於,通過用戶分群及波束選擇後,服務用戶之通道矩陣會造成接收機之模型錯誤(modeling error),導致效能大幅度降低。因此本論文目標為在波束通道下,採用共變異數矩陣估測法及選擇性通道估測法,降低IRC接收機之設計複雜度,並利用對單一用戶檢測來避免接收機模型錯誤,維持其系統效能。關鍵字:干擾抑制合併接收機、共變異數矩陣估測法、選擇性通道估測法、單一用戶檢測
    Multi-user multiple-input and multiple-output (MU-MIMO) technology has been used popularly in wireless communication systems due to its superior throughput enhancement. However, the complexity of maximum-likelihood (ML) MU-MIMO detector increases exponentially with the number of users and constellation size. Therefore, the low complexity MU-MIMO detector is an important research topic. Another issue in a cellular communication system is the co-channel interference caused by the simultaneous transmission of signals by the other users, including inter-cell interference and intra-cell interference. To overcome the interference problem, this thesis adopts the interference rejection combining (IRC) receiver in the beam domain. The IRC receiver can effectively suppress the inter-cell and intra-cell interference. According to the sparse property of beam domain channel response, using user grouping and beam selection can effectively reduce the complexity of the receiver design. However, when using joint MU-MIMO detection with beam selection, the receiver performance degrades significantly due to the mismatch of estimated channel and estimated covariance matrix. Therefore, the objective of this thesis is to over beam space to reduce the complexity of the IRC receiver and to avoid the mismatch by single user detection. Simulation results show that single user detection performs the same as the multi-user detection.Key Words: interference rejection combining (IRC) receiver, selective channel estimation, covariance matrix estimation, single-user detection.
    Appears in Collections:[通訊工程研究所] 學位論文

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