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首页> 外文期刊>Communications, IEEE Transactions on >Cognitive and Energy Harvesting-Based D2D Communication in Cellular Networks: Stochastic Geometry Modeling and Analysis
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Cognitive and Energy Harvesting-Based D2D Communication in Cellular Networks: Stochastic Geometry Modeling and Analysis

机译：蜂窝网络中基于认知和能量收集的D2D通信：随机几何建模和分析

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摘要

While cognitive radio enables spectrum-efficient wireless communication, radio frequency (RF) energy harvesting from ambient interference is an enabler for energy-efficient wireless communication. In this paper, we model and analyze cognitive and energy harvesting-based device-to-device (D2D) communication in cellular networks. The cognitive D2D transmitters harvest energy from ambient interference and use one of the channels allocated to cellular users (in uplink or downlink), which is referred to as the D2D channel, to communicate with the corresponding receivers. We investigate two spectrum access policies for cellular communication in the uplink or downlink, namely, random spectrum access (RSA) policy and prioritized spectrum access (PSA) policy. In RSA, any of the available channels including the channel used by the D2D transmitters can be selected randomly for cellular communication, while in PSA the D2D channel is used only when all of the other channels are occupied. A D2D transmitter can communicate successfully with its receiver only when it harvests enough energy to perform channel inversion toward the receiver, the D2D channel is free, and the signal-to-interference-plus-noise ratio at the receiver is above the required threshold; otherwise, an outage occurs for the D2D communication. We use tools from stochastic geometry to evaluate the performance of the proposed communication system model with general path-loss exponent in terms of outage probability for D2D and cellular users. We show that energy harvesting can be a reliable alternative to power cognitive D2D transmitters while achieving acceptable performance. Under the same outage requirements as for the non-cognitive case, cognitive channel access improves the outage probability for D2D users for both the spectrum access polic- es. When compared with the RSA policy, the PSA policy provides a better performance to the D2D users. Also, using an uplink channel provides improved performance to the D2D users in dense networks when compared to a downlink channel. For cellular users, the PSA policy provides almost the same outage performance as the RSA policy.
机译：尽管认知无线电实现了频谱高效的无线通信，但从环境干扰中收集射频（RF）能量却是实现了节能无线通信的推动力。在本文中，我们对蜂窝网络中基于认知和能量收集的设备到设备（D2D）通信进行建模和分析。认知D2D发射机从环境干扰中获取能量，并使用分配给蜂窝用户（在上行链路或下行链路中）的信道之一（称为D2D信道）与相应的接收机进行通信。我们研究了上行链路或下行链路中用于蜂窝通信的两种频谱访问策略，即随机频谱访问（RSA）策略和优先频谱访问（PSA）策略。在RSA中，可以随机选择任何可用的信道（包括D2D发射机使用的信道）进行蜂窝通信，而在PSA中，仅当所有其他信道都被占用时才使用D2D信道。只有当D2D发射器收集到足够的能量以向接收器执行信道反转，D2D信道空闲且接收器处的信噪比大于要求的阈值时，它才能与接收器成功通信。否则，D2D通信将发生中断。我们使用随机几何中的工具，以D2D和蜂窝用户的断电概率来评估具有一般路径损耗指数的拟议通信系统模型的性能。我们表明，能量收集可以成为为认知D2D发射器供电的可靠替代方案，同时实现可接受的性能。在与非认知案例相同的中断需求下，认知信道访问可提高两个频谱访问策略的D2D用户的中断概率。与RSA策略相比，PSA策略为D2D用户提供了更好的性能。而且，与下行链路信道相比，使用上行链路信道为密集网络中的D2D用户提供了改进的性能。对于蜂窝用户，PSA策略提供的中断性能几乎与RSA策略相同。

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