In this letter, we propose a novel hybrid type of power-domain non-orthogonal multiple access (NOMA) in downlink environments, called partial NOMA (P-NOMA). In conventional NOMA, where the signals of user equipments (UEs) are fully overlapped, the utilization of the bandwidth can be maximized, but doing so also maximizes the interference from the other UEs. P-NOMA partially overlaps the UEs' signals by controlling the extent of the overlap and can thus reduce the interference from other UEs. To verify whether this is a possibility with P-NOMA, we observed the performance tendency of the achievable rate versus the overlap ratio and then confirmed that there is an overlap ratio that achieves performance that is better than that of conventional NOMA with respect to the sum of the achievable rate. In other words, slightly reducing the overlap ratio improves the sum of the achievable rate compared to the full overlap ratio.
Bibliographical noteFunding Information:
Manuscript received February 20, 2019; revised April 18, 2019; accepted May 15, 2019. Date of publication May 24, 2019; date of current version October 11, 2019. This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) under Grant 2018R1A2A1A05021029, and in part by the Institute for Information and Communications Technology Promotion (IITP) grant funded by the Korea Government (MSIT, Development on the Core Technologies of Transmission, Modulation and Coding With Low-Power and Low-Complexity for Massive Connectivity in the IoT Environment) under Grant 2016-0-00181-004. The associate editor coordinating the review of this paper and approving it for publication was H. T. Dinh. (Corresponding author: Daesik Hong.) B. Kim and D. Hong are with the Information Telecommunication Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: email@example.com; firstname.lastname@example.org).
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Electrical and Electronic Engineering