DoF Upper Bound on Three-User MISO Broadcast Channel with Two Antennas and Mixed CSIT
Abstract
With delayed and imperfect current channel state information at the transmitter (CSIT), namely mixed CSIT, the sum degrees-of-freedom (sum-DoF) in the two-user multiple-input multiple-output (MIMO) broadcast channel and the -user multiple-input single-output (MISO) broadcast channel with not-less-than- transmit antennas have been obtained. However, the case of the three-user broadcast channel with two transmit antennas and mixed CSIT is still unexplored. In this paper, we investigate the sum-DoF upper bound of three-user MISO broadcast channel with two transmit antennas and mixed CSIT. By exploiting genie-aided signaling and extremal inequalities, we derive the sum-DoF upper bound as , which is at most larger than the expected sum-DoF, given by . This indicates that the gap may mitigate by better bounding the imperfect current CSIT counterpart.
Keywords
Cite
@article{arxiv.2306.14246,
title = {DoF Upper Bound on Three-User MISO Broadcast Channel with Two Antennas and Mixed CSIT},
author = {Shuo Zheng and Tong Zhang and Shuai Wang and Gaojie Chen and Guoliang Li and Shancheng Zhao and Rui Wang},
journal= {arXiv preprint arXiv:2306.14246},
year = {2023}
}
Comments
This paper has been accepted by IEEE International Conference on Computer and Communication Systems (ICCCS) 2023