Physical layer security using multi-band transmission considering channel selection for cognitive radio networks

In this paper, we consider a secrecy transmission scheme based on physical layer, employing multi-band transmitters with dynamic power allocations and channel selections under the circumstance of spectrum sharing cognitive radio networks. Here, we apply a physical layer security utilizing multi-band transmitter for distributing each confidential message of each receiver over multiple frequency channels and for decreasing leakage. Moreover, we aim to improve the secrecy capacity by using a channel selection method based on the channel condition of each user and primary usage. By using computer simulations, we could verify that the proposed method improves the performance in terms of secrecy capacity against eavesdropping compared with methods using single-band transmission under primary user coexisting environment.