NOMA用于高能效的LiFi-Enabled双向IoT通信
NOMA for Energy-Efficient LiFi-Enabled Bidirectional IoT Communication
摘要：
在本文中，我们考虑了一种支持光保真（LiFi）的双向物联网（IoT）通信系统，其中可见光和红外光分别用于下行链路和上行链路。为了提高双向LiFi-IoT系统的能量效率（EE），应用具有服务质量（QoS）保证的最优功率分配（OPA）策略的非正交多址接入（NOMA）来最大化系统的EE。我们推导出一个封闭形式的OPA集的基础上确定的最佳解码顺序在下行链路和上行链路信道，这可以使低复杂度的功率分配。此外，我们提出了一个自适应的信道和QoS为基础的用户配对方法，通过联合考虑用户的信道增益和QoS要求。我们进一步分析了双向LiFi-IoT系统的EE以及系统的下行链路和上行链路信道的用户中断概率（UOP）。大量的分析和仿真结果表明，NOMA与OPA相比，正交多址接入（OMA）和NOMA与典型的基于信道的功率分配策略的优越性。它还表明，所提出的自适应信道和基于QoS的用户配对方法大大优于单独的信道/基于QoS的方法，特别是当用户有不同的QoS要求。
英文摘要：
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.
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