Abstract
In this paper, we propose a secure large-scale multiuser multiple-input multiple-output (MU-MIMO) system based on a common-key encryption scheme in uplink. This is a newly proposed large-scale system for a chaos MIMO (C-MIMO) transmission scheme with channel coding and physical layer security effects. However, the calculation complexity for demodulation exponentially increases with the number of transmit antennas in a straightforward conventional large-scale C-MIMO system. Therefore, in this paper, we propose the application of Gaussian belief propagation (GaBP), which is an iterative signal detection method with low calculation complexity, to the C-MIMO scheme. Consequently, we can construct a large-scale MIMO system which has a physical layer security effect with a low calculation complexity, and it is shown that a large channel coding gain can be obtained compared with unencrypted transmission with the same transmission efficiency.
