Secure wireless communication with random phases in transmitter under MISO-OFDM system

This paper studied physical-layer MISO-OFDM (Multiple Input Single Output) secure communication with random phases in transmitter. Channel estimation error caused by OFDM pilot symbol transmission was discussed and overall transmission power was minimized by amplitude adjustment of transmitted signals under 16QAM modulation. Moreover, mathematical expression of security rate between legitimate channel and wire-tap channel was derived and how number of transmitter antennas Nt, correlation factor ρ and CNR (carrier to noise ratio) will influence actual security rate was investigated and illustrated by simulation in our proposal.