Resource Efficient Full-Duplex Mode of Transmissions Under Imperfect CSI

To enable spectrum-efficient and energy-efficient technology, this article analyzes a full-duplex (FD) assisted multiuser-MIMO (MU-MIMO) system which affected by imperfect channel state information (ICSI) for a Rician fading environment. This system suffers from co-channel interference, multi-user interferences, multiple stream interferences, residual Self-interference, and noise. To combat interferences while achieving maximum spectral and energy efficiencies, we propose an efficient signal-to-leakage-plus-noise ratio precoding scheme (SLNR-PS), resulting in closed-form expressions. By using this precoding scheme, we can determine the optimal precoding coefficients for uplinks and downlinks. FD MU-MIMO's total spectral efficiency (SE) is achieved using the optimized coefficients. We also employ a power consumption model to achieve our goal of maximizing energy efficiency. For all Rician factors and a given transmission power at the base station (BS) and uplink users, the spectral efficiency of a full-duplex based on the SLNR precoding scheme outperforms a half-duplex system as the number of antennas at the BS and per user in both channels grows. Based on the proposed SLNR-PS for the impacts of the CSI error, circuit power consumption, and transmission power, we have also shown through simulations that the attainable energy efficiency of the full-duplex mode is higher than that of the conventional half-duplex mode of transmission.