1 research outputs found
Secure Transmit Antenna Selection Protocol for MIMO NOMA Networks over Nakagami-m Channels
In this paper, we studied a multi-input multi-output (MIMO) non-orthogonal
multiple access (NOMA) network consisting of one source and two legitimate
users (LUs), so-called near and far users according to their distances to the
source, and one passive eavesdropper, over Nakagami-\textit{m} fading channel.
Specifically, we investigated the scenario that the signals of the far user
might or might not be decoded successfully at the eavesdropper and the near
user. Thus, we aimed at designing a transmit antenna selection (TAS) secure
communication protocol for the network. Then, two TAS solutions, namely
Solutions I and II, were proposed. Specifically, solutions I and II focus on
maximizing the received signal power between the source and the near user, and
between the source and the far user, respectively. Accordingly, the exact and
asymptotic closed-form expressions of the secrecy outage probability for the
LUs and the overall system were derived. Our analytical results corroborated by
Monte Carlo simulation indicate that the secrecy performance could be
significantly improved by properly selecting power allocation coefficients and
increasing the number of antennas at the source and the LUs. Interestingly,
solution II could provide a better overall secrecy performance over solution I.Comment: 12 pages, 10 figure