ABSTRACT

In this paper, we investigate the performance of a downlink cooperative non-orthogonal multiple access (C-NOMA) system with full-duplex decode-and-forward relaying, where a NOMA user with better channel operates as a full-duplex (FD) relay to assist other NOMA-user to forward its messages to the base station (BS). Specifically, we derive the exact expressions of the system performances in terms of outage probability and ergodic capacity for two users over the Nakagami-$m$ fading channels for the case with the direct link from the BS to users. We then analyse the impacts of residual self-interference (SI) due to imperfect self-interference cancellation in the FD mode and multiple access interference (MAI) due to imperfect co-channel interference cancellation (CCIC) on the system performance. Simulation results are provided to verify the theoretical analysis and demonstrate the advantages of the FD-C-NOMA system over the FD non-cooperative NOMA (FD-NC-NOMA) system and the half-duplex C-NOMA (HD-C-NOMA) one.

摘要

在本文中，我们研究了具有全双工解码转发中继功能的下行协作非正交多址（C-NOMA）系统的性能，其中具有更好信道的NOMA用户用作全双工（FD）中继以帮助其他NOMA用户将其消息转发到基站（BS）。具体来说，我们根据Nakagami上两个用户的中断概率和遍历容量推导了系统性能的精确表达式。$米$从BS到用户的直接链接的情况下的衰落信道。然后，我们分析了由于FD模式下不完善的自干扰消除而引起的残余自干扰（SI）和由于不完善的同信道干扰对消除（CCIC）造成的多址干扰（MAI）对系统性能的影响。提供仿真结果以验证理论分析并证明FD-C-NOMA系统优于FD非合作NOMA（FD-NC-NOMA）系统和半双工C-NOMA（HD-C-NOMA） ） 一。