Skip to main content

Secure Degrees of Freedom of Wireless X Networks Using Artificial Noise Alignment

Author(s): Wang, Zhao; Xiao, Ming; Skoglund, Mikael; Poor, H Vincent

To refer to this page use:
Abstract: The problem of transmitting confidential messages in M x K wireless X networks is considered in which each transmitter intends to send one confidential message to every receiver. In particular, the secure degrees of freedom (SDOF) of the considered network are studied based on an artificial noise alignment (ANA) approach, which integrates interference alignment and artificial noise transmission. At first, an SDOF upper bound is derived for the M x K X network with confidential messages (XNCM) to be K(M-1)/K+M-2. By proposing an ANA approach, it is shown that the SDOF upper bound is tight when K = 2 for the considered XNCM with time-/frequency-varying channels. For K ≥ 3, it is shown that SDOF of K(M-1)/K+M-1 can be achieved, even when an external eavesdropper is present. The key idea of the proposed scheme is to inject artificial noise into the network, which can be aligned in the interference space at receivers for confidentiality. Moreover, for the network with no channel state information at transmitters, a blind ANA scheme is proposed to achieve SDOF of K(M-1)/K+M-1 for K, M ≥ 2, with reconfigurable antennas at receivers. The proposed method provides a linear approach to secrecy coding and interference alignment.
Publication Date: 18-May-2015
Citation: Wang, Zhao, Xiao, Ming, Skoglund, Mikael, Poor, H Vincent. (2015). Secure Degrees of Freedom of Wireless X Networks Using Artificial Noise Alignment. IEEE Transactions on Communications, 63 (7), 2632 - 2646. doi:10.1109/tcomm.2015.2434378
DOI: doi:10.1109/tcomm.2015.2434378
ISSN: 0090-6778
EISSN: 1558-0857
Pages: 2632 - 2646
Type of Material: Journal Article
Journal/Proceeding Title: IEEE Transactions on Communications
Version: Author's manuscript

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.