Secrecy and Energy Efficiency in Massive MIMO Aided Heterogeneous C-RAN: A New Look at Interference
Secrecy and Energy Efficiency in Massive MIMO Aided Heterogeneous C-RAN: A New Look at Interference
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DOI：
10.1109/jstsp.2016.2600520
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发表时间：
2016-07
影响因子：
7.5
通讯作者：
Lifeng Wang;Kai‐Kit Wong;M. Elkashlan;A. Nallanathan;S. Lambotharan
中科院分区：
文献类型：
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作者：
Lifeng Wang;Kai‐Kit Wong;M. Elkashlan;A. Nallanathan;S. Lambotharan
在本文中，我们研究了支持大规模多输入多输出（MIMO）的异构云无线接入网络（C-RAN）在保密性和能源效率（EE）方面的潜在优势。在该网络中，同时部署远程无线电头端（RRH）和大规模MIMO宏蜂窝基站，并采用软分数频率复用来减轻层间干扰。我们首先通过推导区域遍历保密率和保密中断概率来检查物理层安全性。我们的结果表明，使用大规模 MIMO 和 C-RAN 可以极大地提高保密性能。对于C-RAN，大量的RRH由于其强大的干扰管理而实现了高区域遍历保密率和低保密中断概率。我们发现，对于大规模 MIMO 辅助的宏蜂窝，拥有更多天线并为更多用户提供服务可以提高保密性能。然后，我们推导了异构 C-RAN 的 EE，说明增加 RRH 数量可以显着提高网络 EE。此外，还表明向RRH分配更多的无线资源可以线性增加RRH层的EE并改善网络EE而不影响宏小区的EE。
In this paper, we investigate the potential benefits of the massive multiple-input multiple-output (MIMO) enabled heterogeneous cloud radio access network (C-RAN) in terms of the secrecy and energy efficiency (EE). In this network, both remote radio heads (RRHs) and massive MIMO macrocell base stations are deployed and soft fractional frequency reuse is adopted to mitigate the intertier interference. We first examine the physical layer security by deriving the area ergodic secrecy rate and secrecy outage probability. Our results reveal that the use of massive MIMO and C-RAN can greatly improve the secrecy performance. For C-RAN, a large number of RRHs achieves high area ergodic secrecy rate and low-secrecy outage probability, due to its powerful interference management. We find that for massive MIMO aided macrocells, having more antennas and serving more users improves secrecy performance. Then, we derive the EE of the heterogeneous C-RAN, illustrating that increasing the number of RRHs significantly enhances the network EE. Furthermore, it is indicated that allocating more radio resources to the RRHs can linearly increase the EE of RRH tier and improve the network EE without affecting the EE of the macrocells.