Design and Performance Analysis of Interference cancellation inHeterogeneous networks With Multi-Antenna Arrays
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Abstract
To improve national security, government agencies have long been committed to enforcing powerful
surveillance measures on suspicious individuals or communications. In this paper, we consider a
wireless legitimate surveillance system, where a full-duplex multi-antenna legitimate monitor aims to
eavesdrop on a dubious communication link between a suspicious pair via proactive jamming.
Massive Multiple-Input Multiple-Output (MIMO), small cell, and full-duplex are promising
techniques for future 5G communication systems, where interference has become the most
challenging issue to be coped with. In this paper, we provide an interference coordination framework
for a two-tier heterogeneous network (HetNet) that consists of a massive-MIMO enabled macro-cell
base station (MBS) and a number of full-duplex small-cell base stations (SBSs). For each scenario,
the optimal jamming power is derived in closedform and efficient algorithms are obtained for the
optimal transmit/receive beamforming vectors. Moreover, low-complexity suboptimal beamforming
schemes are proposed for the MIMO case. Our analytical findings demonstrate that by exploiting
multiple antennas at the legitimate monitor, the eavesdropping non-outage probability can be
significantly improved compared to the single antenna case.
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