Home > Published Issues > 2025 > Volume 20, No. 6, 2025 >
JCM 2025 Vol.20(6): 640-645
Doi: 10.12720/jcm.20.6.640-645

Distance-Based User Scheduling for Fully Connected Hybrid Precoding

Hung Pham1, Bac Dang Hoai1, Quy Vu Khanh2, and Ban Nguyen Tien1,*
1Telecommunication Faculty, Posts and Telecommunications Institute of Technology, Hanoi, Vietnam
2Faculty of Information Technology, Hung Yen University Technology and Education, Vietnam
Email: hungpham@ptit.edu.vn (H.P.); bacdh@ptit.edu.vn (B.D.H.); quyvk@utehy.edu.vn (Q.V.K.); bannt@ptit.edu.vn (B.N.T.)
*Corresponding author

Manuscript received May 21, 2025; revised July 14, 2025, accepted July 22, 2025; published November 6, 2025.

Abstract—Benefiting from the ultra-wide bandwidth, Terahertz (THz) communication is a promising solution for future 6G wireless communications. For THz communication, precoding is an essential technique to overcome the key challenges of THz signals such as the distance-dependent path loss, the beam split effect and the severe path loss. Moreover, the sharp increase in the number of antennas results in high complexity for the channel information estimation and user scheduling. In this paper, we proposed a novel scheduling, termed as Distance-Based User Scheduling (DBUS), which firstly selects the users in different distance to exploit the characteristic distance-dependent path loss in order to increase the spatial multiplexing gain. Secondly, the proposed scheduling chooses users who are semi orthogonal to each other in the beam space to reduce the complexity of exhausted search. Through the numerical analysis we confirmed that DBUS scheduling can approximate the achievable rate of Maximum Rate method with a lower complexity and outperform the Round Robin scheduling.


Keywords—Ultra Massive MIMO (UM MIMO), scheduling, hybrid precoding, fully connected, digital optimal precoding, time delay


Cite: Hung Pham, Bac Dang Hoai, Quy Vu Khanh, and Ban Nguyen Tien, “Distance-Based User Scheduling for Fully Connected Hybrid Precoding," Journal of Communications, vol. 20, no. 6, pp. 640-645, 2025.


Copyright © 2025 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Article Metrics in Dimensions