Research on anti-eavesdropping security beamforming for IRS-assisted cell-free massive MIMO system
Currently,the physical layer communication is easily blocked by buildings and eavesdropped by illegal users.To improve the secure communication performance of the physical layer,this paper proposes an Intelligent Reflecting Surface(IRS)to assist in cell-free massive Multiple-Input Multiple-Output(MIMO)system anti-eavesdropping secure transmission beamforming scheme.With the ideal channels,to restore the signal received by legitimate users,prevent the signal received by illegal users,and minimize the transmission beamforming vector,a joint beamforming problem of base station active beamforming vector and IRS phase shift is built.The original problem is decomposed into the base station beamforming vector optimization sub-problem and the IRS phase shift optimization sub-problem through alternating optimization,and the optimization sub-problem is addressed through the method of solving non-homogeneous linear equations.Our simulation results show the proposed scheme effectively eradicates the eavesdropping signals of illegal users,reduces the transmission power,and achieves a superior bit error rate(BER)compared with the traditional physical layer secure communication scheme.
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