For rank-one base station to reflecting surface channels, the optimal secrecy beamforming is the channel-matched vector, and phase design reduces to a hard quadratic problem solved by SDP or gradient methods.
Guaranteeing secrecy using artificial noise,
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Secure Transmission Strategy for Intelligent Reflecting Surface Enhanced Wireless System
For rank-one base station to reflecting surface channels, the optimal secrecy beamforming is the channel-matched vector, and phase design reduces to a hard quadratic problem solved by SDP or gradient methods.