Secrecy Transmit Beamforming for Heterogeneous Networks
arXiv:1503.01056 · doi:10.1109/JSAC.2015.2416984
Abstract
In this paper, we pioneer the study of physical-layer security in heterogeneous networks (HetNets). We investigate secure communications in a two-tier downlink HetNet, which comprises one macrocell and several femtocells. Each cell has multiple users and an eavesdropper attempts to wiretap the intended macrocell user. Firstly, we consider an orthogonal spectrum allocation strategy to eliminate co-channel interference, and propose the secrecy transmit beamforming only operating in the macrocell (STB-OM) as a partial solution for secure communication in HetNet. Next, we consider a secrecy-oriented non-orthogonal spectrum allocation strategy and propose two cooperative STBs which rely on the collaboration amongst the macrocell base station (MBS) and the adjacent femtocell base stations (FBSs). Our first cooperative STB is the STB sequentially operating in the macrocell and femtocells (STB-SMF), where the cooperative FBSs individually design their STB matrices and then feed their performance metrics to the MBS for guiding the STB in the macrocell. Aiming to improve the performance of STB-SMF, we further propose the STB jointly designed in the macrocell and femtocells (STB-JMF), where all cooperative FBSs feed channel state information to the MBS for designing the joint STB. Unlike conventional STBs conceived for broadcasting or interference channels, the three proposed STB schemes all entail relatively sophisticated optimizations due to QoS constraints of the legitimate users. In order to efficiently use these STB schemes, the original optimization problems are reformulated and convex optimization techniques, such as second-order cone programming and semidefinite programming, are invoked to obtain the optimal solutions. Numerical results demonstrate that the proposed STB schemes are highly effective in improving the secrecy rate performance of HetNet.
17 pages, 14 figures, 3 algorithms and 1 table, to appear in IEEE Journal on Selected Areas in Communications, 2015
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- Secure Communications in Millimeter Wave Ad Hoc Networks
- Joint Radio Resource Allocation and 3D Beam-forming in MISO-NOMA-based Network with Profit Maximization for Mobile Virtual Network Operators
- Multi-Antenna Aided Secrecy Beamforming Optimization for Wirelessly Powered HetNets
- Physical Layer Security in a SISO Communication using Frequency-Domain Time-Reversal OFDM Precoding and Artificial Noise Injection
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- Secrecy Outage and Diversity Analysis of Multiple Cooperative Source-Destination Pairs
- Security-Reliability Tradeoff for Distributed Antenna Systems in Heterogeneous Cellular Networks
- Secrecy Beamforming for SWIPT MISO Heterogeneous Cellular Networks
- Physical Layer Security in Heterogeneous Cellular Networks