Cooperative relays have been studied to enhance the physical layer security. Node selection and artificial noise generation are used to degrade the performance of eavesdroppers. Recently, intelligent reflective surface(IRS) has also been introduced to improve the PLS. Therefore, Which one is better?
Emil Björnson
I don't think one can give a definitive answer to broad questions like this. You are mentioning two general ways of increasing PLS. The first one is to transmit the signal in a directive manner towards the receiver, in hope that the eavesdroppers will not achieve any directivity gain. An IRS can be used to achieve towards this end. The second one is to transmit artificial noise in other directions. I don't think that an IRS is useful for that.
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