Secure Transmission of Cognitive Wiretap Networks Based on Differential Spatial Modulation

This paper studies the secrecy performance of cognitive wiretap networks, in which the secrecy secondary transmitter (Alice) transmits information to multiple secondary receivers (Bobs) in the presence of an eavesdropper (Eve). Specifically, to reduce the power consumption and complexity of the secondary users, this paper put forward a novel transmission scheme based on the differential spatial modulation (DSM), which can reduce the processing complexity at Alice and Bobs. Moreover, the exact and asymptotic closed-form expressions, for secrecy outage probability and effective secrecy throughput, are derived to assess the performance of the proposed DSM scheme. From the analysis, we demonstrate that a) the secrecy diversity is determined by the number of the Alice’s antennas and the number of Bobs, b) the secrecy performance of the considered cognitive wiretap networks based on DSM outperforms the same networks without DSM.