On the Secure Degrees of Freedom in the K-User Gaussian Interference Channel
This paper studies the K-user Gaussian interference channel with secrecy constraints. Two distinct network models, namely the interference channel with confidential messages and the one with an external eavesdropper, are analyzed. Using interference alignment along with secrecy pre-coding at each transmitter, it is shown that each user in the network can achieve non-zero secure Degrees of Freedoms (DoFs) in both scenarios. Recently, there has been a growing interest in the design and analysis of secure wireless networks based on information theoretic principles. For example, the secrecy capacity of networks involving relay nodes is studied in, while the secrecy capacity of the wiretap channel with feedback. On the other hand, multiple access channels with secrecy constraints were analyzed and the broadcast channel model was investigated.