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Secrecy and Energy Efficiency in Massive MIMO Aided Heterogeneous C-RAN: A New Look at Interference

Research output: Contribution to journalArticle

Lifeng Wang, Kai-Kit Wong, Maged Elkashlan, Arumugam Nallanathan, Sangarapillai Lambotharan

Original languageEnglish
Article number7544500
Pages (from-to)1375-1389
Number of pages15
JournalIeee Journal Of Selected Topics In Signal Processing
Issue number8
Early online date16 Aug 2016
Publication statusPublished - Dec 2016


King's Authors



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 (BSs) are deployed and soft fractional frequency reuse
(S-FFR) is adopted to mitigate the inter-tier 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.

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