Full-duplex multi-user MIMO communication systems performance optimization using leakage-based precoding

Merhawit Berhane Teklu; Dong-You Choi; Wei-Xiao Meng

doi:10.1038/s41598-023-35409-9

Full-duplex multi-user MIMO communication systems performance optimization using leakage-based precoding

Sci Rep. 2023 May 23;13(1):8309. doi: 10.1038/s41598-023-35409-9.

Authors

Merhawit Berhane Teklu¹, Dong-You Choi², Wei-Xiao Meng³

Affiliations

¹ Department of Information and Communication Engineering, Chosun University, Gwangju, 61452, South Korea.
² Department of Information and Communication Engineering, Chosun University, Gwangju, 61452, South Korea. dychoi@chosun.ac.kr.
³ School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin, 150080, China.

Abstract

The spectral efficiency (SE) can approximately double when using full-duplex (FD) multiuser MIMO communications. However, there are difficulties because of multiuser interferences, self-interference (SI), and co-channel interference (CCI). To improve the SE of the downlink (DL), this paper proposes CCI-aware enhancement to SLNR (signal-to-leakage-and-noise-ratio) signal-to-leakage-and-noise-ratio (SLNR). It considers a suppressing filter at the receiver to cancel the interferences again designing a beamformer based on CCI-plus-noise covariance matrices for every user at the transmitting side. Additionally, we propose an improvement in the SLNR method by using SI-plus-noise covariance matrices to design uplink (UL) beamformers. Unlike zero-forcing and block-diagonalization, the SLNR approach serves numerous antennas at users and BS (base station). The total SE of the communication yielded using the optimized precoder, i.e., obtained from the SLNR-based precoding. To achieve maximum energy efficiency (EE), we use a power consumption model. Simulation results confirm that full-duplex performs well compared to half-duplex (HD) when the number of antennas at every user in uplink as well downlink channels grow, for all Rician factors, for slight powers of the CCI and SI, and a limited number of antennas at the BS. With the proposed scheme for given transmit power and circuit power, we demonstrate that FD has a higher EE than HD.