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In this paper we address a sum secrecy rate maximization problem for amulti-carrier and MIMO communication system. We consider the case that thereceiver is capable of full-duplex (FD) operation and simultaneously sendsjamming signal to a potential eavesdropper. In particular, we simultaneouslytake advantage of the spatial and frequency diversity in the system in order toobtain a higher level of security in the physical layer. Due to the non-convexnature of the resulting mathematical problem, we propose an iterative solutionwith a guaranteed convergence, based on block coordinate descent method, byre-structuring our problem as a separately convex program. Moreover, for thespecial case that the transmitter is equipped with a single antenna, an optimaltransmit power allocation strategy is obtained analytically, assuming a knownjamming strategy. We also study a FD bidirectional secure communication system,where the jamming power can be reused to enhance the sum secrecy rate. Theperformance of the proposed design is then numerically evaluated compared tothe other design strategies, and under different system assumptions.

Sum Secrecy Rate Maximization in a Multi-Carrier MIMO Wiretap Channel with Full-Duplex Jamming