Performance of Overlaid MIMO Cellular Networks with TAS/MRC under Hybrid-Access Small Cells and Poisson Field Interference

Amr A. Abdelnabi, F. Al-Qahtani, R. Radaydeh, M. Shaqfeh, Raed F. Manna
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Abstract

This paper presents new approaches to characterize the achieved performance of hybrid control-access small cells in the context of two-tier multi-input multi-output (MIMO) cellular networks with random interference distributions. The hybrid scheme at small cells (such as femtocells) allows for sharing radio resources between the two network tiers according to the densities of small cells and their associated users, as well as the observed interference power levels in the two network tiers. The analysis considers MIMO transceivers at all nodes, for which antenna arrays can be utilized to implement transmit antenna selection (TAS) and receive maximal ratio combining (MRC) under MIMO point-to-point channels. Moreover, it tar-gets network-level models of interference sources inside each tier and between the two tiers, which are assumed to follow Poisson field processes. To fully capture the occasions for Poisson field distribution on MIMO spatial domain. Two practical scenarios of interference sources are addressed including highly-correlated or uncorrelated transmit antenna arrays of the serving macrocell base station. The analysis presents new analytical approaches that can characterize the downlink outage probability performance in any tier. Furthermore, the outage performance in high signal-to-noise (SNR) regime is also obtained, which can be useful to deduce diversity and/or coding gains.
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混合接入小蜂窝和泊松场干扰下TAS/MRC叠加MIMO蜂窝网络的性能
本文提出了在具有随机干扰分布的两层多输入多输出(MIMO)蜂窝网络中表征混合控制接入小单元的性能的新方法。小型蜂窝(如飞蜂窝)的混合方案允许根据小型蜂窝及其相关用户的密度,以及在两个网络层中观察到的干扰功率水平,在两个网络层之间共享无线电资源。该分析考虑了所有节点的MIMO收发器,在MIMO点对点信道下,可以利用天线阵列实现发射天线选择(TAS)和接收最大比组合(MRC)。此外,它还针对每层内部和两层之间的干扰源的网络级模型,假设它们遵循泊松场过程。为了充分捕捉MIMO空间域泊松场分布的场合。讨论了两种干扰源的实际情况,包括服务宏蜂窝基站的高相关或不相关发射天线阵列。该分析提出了新的分析方法,可以表征任何层的下行链路中断概率性能。此外,还获得了高信噪比(SNR)状态下的中断性能,这可以用于推断分集和/或编码增益。
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