Physical Layer Security in Multiuser Wireless Networks

Physical layer (PHY) security has recently gained considerable attention as an alternative option to cryptographic techniques since it can provide unconditional perfect secrecy. This chapter presents brief concept about PHY security and solutions along with quantitative measurement of secrecy performance for multiuser wireless networks. A typical transmitter in wireless communication may be required to send a confidential message to either a single or several users simultaneously. Aiming to provide comprehensive investigation of secrecy performance in such multiuser network, secure multicasting and opportunistic scheduling techniques are presented. Furthermore, to look into the effects of multiple antennas, system model under consideration employ maximal ratio combining at receiver.

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