In this paper, a comprehensive comparison analysis in terms of outage probability and average symbol error ratio (SER) is presented for cooperative cognitive multiple-input and multiple-output (CC-MIMO) multiuser systems with amplify-and-forward (AF) protocol. Specially, we consider two scenarios where the CC-MIMO multiuser systems have the perfect and imperfect channel state information (CSI)....

This paper investigates the optimization of primary base station (BS) to effectively support a symbiotic radio (SR) network between consisting single user and secondary comprising multiple tags backscatter network. The use non-orthogonal access for communication, we consider passive reconfigurable tags. To decode data successfully, adopts successive interference cancellation technique. However,...

The objective of this article is to review and benchmark strategies to acquire channel state information (CSI) in time-division duplex (TDD) Massive MIMO systems. In particular, we consider the use of statistical CSI at the base stations (BSs), together with non-orthogonal pilot sequences. Such techniques can theoretically reduce the amount of spectral resources dedicated to channel sounding, t...