1 research outputs found
Energy Efficient Robust Beamforming and Cooperative Jamming Design for IRS-Assisted MISO Networks
Energy-efficient design and secure communications are of crucial importance
in wireless communication networks. However, the energy efficiency achieved by
using physical layer security can be limited by the channel conditions. In
order to tackle this problem, an intelligent reflecting surface (IRS) assisted
multiple input single output (MISO) network with independent cooperative
jamming is studied. The energy efficiency is maximized by jointly designing the
transmit and jamming beamforming and IRS phase-shift matrix under both the
perfect channel state information (CSI) and the imperfect CSI.
In order to tackle the challenging non-convex fractional problems, an
algorithm based on semidefinite programming (SDP) relaxation is proposed for
solving energy efficiency maximization problem under the perfect CSI case while
an alternate optimization algorithm based on -procedure is used
for solving the problem under the imperfect CSI case.
Simulation results demonstrate that the proposed design outperforms the
benchmark schemes in term of energy efficiency. Moreover, the tradeoff between
energy efficiency and the secrecy rate is found in the IRS-assisted MISO
network. Furthermore, it is shown that IRS can help improve energy efficiency
even with the uncertainty of the CSI.Comment: arXiv admin note: text overlap with arXiv:1911.0513