大規模MIMO系統中基于用戶分組的導頻分配方案
首發時間：2018-06-21
摘要：針對大規模MIMO系統中存在的導頻污染問題，基于導頻使用次數能夠衡量導頻污染強度變化趨勢的分析結果，提出了一種基于用戶分組的導頻分配方案。該方案利用大尺度衰落系數把目標小區中用戶分為兩組，對大尺度衰落系數較小的弱用戶組按導頻污染強度分配，對大尺度衰落系數較大的強用戶組按導頻使用次數分配。該方案在保障弱用戶公平性的同時提升上行鏈路的平均可達和速率。仿真結果表明，與智能導頻分配方案和傳統隨機導頻分配方案相比，所提方案能夠有效地提升大規模MIMO系統的上行鏈路的平均可達和速率。
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Pilot Allocation Scheme Based on User Grouping in Massive MIMO Systems
Abstract：Aiming at the pilot contamination problem in Massive MIMO systems, based on the analysis results that the frequency of pilot usage can measure the change trend of pilot contamination intensity, a pilot allocation scheme based on user grouping is proposed. The users in the target cell are divided into two groups by using the large-scale fading coefficients. In the weak user group with smaller large-scale fading coefficients are allocated according to the pilot contamination intensity. In the strong user group with larger large-scale fading coefficients are allocated according to the frequency of pilot usage. This scheme not only guarantees the fairness of weak users, but also improves the average achievable sum rates of the uplink. Simulation results show that, compared with smart pilot allocation scheme and the traditional random pilot allocation scheme, the proposed scheme can enhance the performance of the Massive MIMO system effectively.
Keywords： massive MIMO pilot contamination user grouping achievable sum rates
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大規模MIMO系統中基于用戶分組的導頻分配方案
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