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Secure Communication in Uplink Transmissions: User Selection and Multiuser Secrecy Gain

By Hao Deng, Hui-Ming Wang, Jinhong Yuan, Wenjie Wang and Qinye Yin

Abstract

In this paper, we investigate secure communications in uplink transmissions, where there are a base station (BS) with M receive antennas, K mobile users each with a single antenna, and an eavesdropper with N receive antennas. The closed-form expressions of the achievable ergodic secrecy sumrates (ESSR) for a random k users selection scheme in the high and low SNR regimes are presented. It is shown that the scaling behavior of ESSR with respect to the number of served users k can be quite different under different system configurations, determined by the numbers of the BS antennas and that of the eavesdropper antennas. In order to achieve a multiuser gain, two low-complexity user selection schemes are proposed under different assumptions on the eavesdropper's channel state information (CSI). The closed-form expressions of the achievable ESSRs and the multiuser secrecy gains of the two schemes are also presented in both low and high SNR regimes. We observe that, as k increases, the multiuser secrecy gain increases, while the ESSR may decrease. Therefore, when N is much larger than M, serving one user with the strongest channel (TDMA-like) is a favourable secrecy scheme, where the ESSR scales with root square of 2 log K.Comment: journal paper, double column, 15 pages, 9 figures, accepted for publication on IEEE Transactions on Communication

Topics: Computer Science - Information Theory
Publisher: 'Institute of Electrical and Electronics Engineers (IEEE)'
Year: 2016
DOI identifier: 10.1109/TCOMM.2016.2585128
OAI identifier: oai:arXiv.org:1608.05473

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