On the Performance of Multi-Relay Cellular Networks with NOMA

Jinjuan Ju, Guoan Zhang, Wei Duan, Qiang Sun, Li Jin
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Abstract

In this paper, a new receiver detection scheme for the cooperative multi-relay system using non-orthogonal multiple access (CMRS-NOMA) is proposed in the cellular networks. In the proposed cellular networks, the base station (BS) would like to communicate multiple users via multiple relays, while that the direct link between BS and users are not considered. Specifically, we further assume that of two relays in approaching scopes to the user can assist the transmission, since that other relays are out of the cooperation scopes. By this way, each user and two corresponding relays can be implemented as one group. In addition, the source simultaneously transmits the superposition coded signals to the relay nodes. After receptions, multi-relay nodes decode the symbols by applying the successive interference cancellation (SIC), and then reconstruct them into new NOMA signals, which will be forwarded to the receiving nodes. The users jointly decode the information symbols received from two adjacent relay nodes with a practical and simple operation, also derive the closed-form expressions of the sum-rate (SR). Qualitative numerical results corroborating our theoretical analysis show that the proposed scheme significantly improves the SR performance compared with the existing works.
基于NOMA的多中继蜂窝网络性能研究
在蜂窝网络中,提出了一种基于非正交多址(CMRS-NOMA)的协同多中继系统接收机检测新方案。在蜂窝网络中,基站(BS)希望通过多个中继与多个用户通信,而不考虑基站与用户之间的直接链路。具体来说,我们进一步假设在接近用户范围内的两个继电器中有一个可以辅助传输,因为其他继电器不在合作范围内。通过这种方式,每个用户和两个相应的继电器可以实现为一组。此外,源同时将叠加编码信号发送到中继节点。接收后,多中继节点通过逐次干扰抵消(SIC)对信号进行解码,重构为新的NOMA信号,转发给接收节点。用户通过实用简单的操作,对相邻两个中继节点接收到的信息符号进行共同解码,并推导出求和速率(SR)的封闭表达式。定性数值结果证实了我们的理论分析,表明与现有方案相比,该方案显著提高了SR性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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