时间相关信道下分布式大规模MIMO系统频谱效率分析

发布时间：2018-02-24 22:06

本文关键词： 分布式大规模多输入多输出多用户时间相关信道频谱效率　出处：《信号处理》2016年11期 　论文类型：期刊论文

【摘要】：为了分析时变信道特性对多用户分布式大规模MIMO系统的频谱效率性能影响,通过引入一阶高斯马尔科夫过程来建模时变信道,以时间相关性系数表征时变快慢程度。当系统采用最大比合并(MRC)接收和最大比发送(MRT)预编码方案时,借助于确定性等价原理以及Gamma分布随机变量的性质,推导出了含有信道时变信息的上行和下行频谱效率闭合表达式。同时,给出了当基站总发送天线数与用户个数之比趋于无穷大时,频谱效率的极限表达式。分析表明,频谱效率随时间相关系数减小而降低,但并不影响系统所获得的发射功率增益。数值仿真验证了所推导的频谱效率闭合表达式和极限值的有效性和精确性,并比较得出时变信道下分布式大规模MIMO比集中式大规模MIMO具有更好的性能。
[Abstract]:In order to influence the performance of spectrum efficiency analysis of time-varying channel characteristics of large-scale multi-user distributed MIMO system, by introducing a first-order Gauss Markov process to model the time-varying channel, the time correlation coefficient characterizes time-varying speed. When using maximum ratio combining (MRC) receive ratio and maximum (MRT) pre encoding scheme. With the help of certainty equivalence principle and the properties of Gamma distributed random variable, is derived with the uplink and downlink channel spectrum efficiency closed expression of time-varying information. At the same time, given the total number of transmit antennas when the base station and the user number ratio tends to infinity, the ultimate expression of spectral efficiency. The results show that the spectral efficiency with time the correlation coefficient decreased, but does not affect the transmission power gain access to the system. The numerical simulation verifies the spectral efficiency of the closed form expression and limit value The effectiveness and accuracy of distributed large scale MIMO under time-varying channels are better than that of centralized large scale MIMO.

【作者单位】：东南大学信息科学与工程学院;池州学院机电工程学院;
【基金】：国家高技术研究发展计划(863计划)(2015AA01A703) 国家重点基础研究发展计划(973计划)(2013CB336600) 国家自然科学基金(61372101,61671144,61271018) 江苏省科技计划项目(BE2015156) 安徽省高校自然科学研究项目(KJ2015A198)
【分类号】：TN919.3

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