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大规模mimo系统中基于用户分组的导频分配方案
首发时间：2018-06-21
摘要：针对大规模mimo系统中存在的导频污染问题，基于导频使用次数能够衡量导频污染强度变化趋势的分析结果，提出了一种基于用户分组的导频分配方案。该方案利用大尺度衰落系数把目标小区中用户分为两组，对大尺度衰落系数较小的弱用户组按导频污染强度分配，对大尺度衰落系数较大的强用户组按导频使用次数分配。该方案在保障弱用户公平性的同时提升上行链路的平均可达和速率。仿真结果表明，与智能导频分配方案和传统随机导频分配方案相比，所提方案能够有效地提升大规模mimo系统的上行链路的平均可达和速率。
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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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