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Secrecy throughput of MISO single-eavesdropper ropper networks with imperfect channel state information

The joint effects of feedback delay, limited feedback and channel estimation errors on the secrecy performance of a multiple-input-single-output (MISO) system employing transmit beamforming against passive eavesdropping are investigated. Closed-form expressions of the effective secrecy throughput which characterise the average rate of achieving reliable and secure transmissions are derived.

Simulation results verify the theoretical analysis and show that different from feedback delay and limited feedback which degrade performance, imperfect channel estimation may not always harm the secrecy throughput. Furthermore, it is interesting to find that there exists an optimal transmit signal-to-noise ratio (SNR) for achieving the maximal secrecy throughput and channel state information imperfections will increase the optimal value of the transmit SNR.

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