论文标题
诺玛用于节能生命的双向物联网通信
NOMA for Energy-Efficient LiFi-Enabled Bidirectional IoT Communication
论文作者
论文摘要
在本文中，我们考虑了启用的光线（LIFI）双向互联网（IoT）通信系统，该系统分别在下行链路和上行链路中分别使用可见光和红外光线。为了提高双向LIFI iot系统的能效（EE），具有服务质量（QOS）的非正交多重访问（NOMA） - 保证最佳功率分配（OPA）策略可用于最大程度地提高系统的EE。我们根据识别下行链路和上行链路通道中最佳解码顺序的识别来得出一个封闭形式的OPA集，这可以启用低复杂功率分配。此外，我们通过共同考虑用户的频道收益和QoS要求，提出了一种自适应渠道和基于QoS的用户配对方法。我们进一步分析了系统下行链路和上行链路通道的双向LIFI iot系统的EE以及用户的停电概率（UOPS）。广泛的分析和仿真结果表明，与正交多重访问（OMA）和NOMA相比，NOMA具有OPA的优势，并具有典型的基于通道的功率分配策略。还表明，所提出的基于QoS的自适应渠道和基于QoS的用户配对方法极大地超过了基于频道/QoS的方法，尤其是当用户有不同的QoS要求时。
In this paper, we consider a light fidelity (LiFi)-enabled bidirectional Internet of Things (IoT) communication system, where visible light and infrared light are used in the downlink and uplink, respectively. In order to improve the energy efficiency (EE) of the bidirectional LiFi-IoT system, non-orthogonal multiple access (NOMA) with a quality-of-service (QoS)-guaranteed optimal power allocation (OPA) strategy is applied to maximize the EE of the system. We derive a closed-form OPA set based on the identification of the optimal decoding orders in both downlink and uplink channels, which can enable low-complexity power allocation. Moreover, we propose an adaptive channel and QoS-based user pairing approach by jointly considering users' channel gains and QoS requirements. We further analyze the EE of the bidirectional LiFi-IoT system and the user outage probabilities (UOPs) of both downlink and uplink channels of the system. Extensive analytical and simulation results demonstrate the superiority of NOMA with OPA in comparison to orthogonal multiple access (OMA) and NOMA with typical channel-based power allocation strategies. It is also shown that the proposed adaptive channel and QoS-based user pairing approach greatly outperforms individual channel/QoS-based approaches, especially when users have diverse QoS requirements.
