Abstract
The problem of wireless security for the downlink of multiuser MISO-OFDMA systems operating over a frequency-selective channel is investigated. Considering interference suppression and resource allocation between different users, a physical-layer security model is proposed that exploits the redundancy of transmit antenna arrays to provide security by deliberate signal randomisation. Signal randomisation causes the receiver's signal to have lower power efficiency than the optimal transmit beamforming. To overcome this problem, a suboptimal, but efficient resource allocation algorithm based on spatial correlation and array redundancy is devised.
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