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arXiv 1806.06286cs.ITmath.IT
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基于NOMA的节能无线供电通信

NOMA-based Energy-Efficient Wireless Powered Communications

Tewodros A. Zewde, M. Cenk Gursoy

摘要:

在本文中,我们研究了非正交多址接入(NOMA)方案在无线供电通信网络(WPCN)的性能,侧重于系统的能量效率(EE)。我们考虑多个能量收集用户设备(UE),其基于收集然后发送协议来操作。通过使用功率域复用来执行上行链路信息传送,并且接收器以具有最佳信道增益的UE被解码而没有干扰的方式来解码每个UE的数据。为了确定最佳的资源分配策略,我们制定优化问题,考虑两种模式,即半双工和异步传输,基于如何协调下行链路和上行链路操作。在这两种情况下,我们有凹线性分式问题,因此Dinkelbach的方法可以用来获得全局最优解。因此,我们首先推导出收获区间的解析表达式,然后我们提供了一个算法来描述完整的过程。此外,我们将延迟有限的来源和调查的影响,统计排队约束的能源效率的分配的操作间隔。我们制定了一个优化问题,最大限度地提高系统的有效EE,而UE应用NOMA方案的上行链路信息传输。由于该问题满足伪随机性,我们给出了一个用二分法确定唯一解的迭代算法。在数值结果中,我们观察到,在更高的功率水平的广播是更节能的WPCN与上行链路NOMA。此外,指数衰减的QoS参数对最优解有很大的影响,在严格的约束条件下,采用上行TDMA模式的半双工工作方式下,下行间隔分配的时间更多。

英文摘要:

In this paper, we study the performance of non-orthogonal multiple access (NOMA) schemes in wireless powered communication networks (WPCN) focusing on the system energy efficiency (EE). We consider multiple energy harvesting user equipments (UEs) that operate based on harvest-then-transmit protocol. The uplink information transfer is carried out by using power-domain multiplexing, and the receiver decodes each UE's data in such a way that the UE with the best channel gain is decoded without interference. In order to determine optimal resource allocation strategies, we formulate optimization problems considering two models, namely half-duplex and asynchronous transmission, based on how downlink and uplink operations are coordinated. In both cases, we have concave-linear fractional problems, and hence Dinkelbach's method can be applied to obtain the globally optimal solutions. Thus, we first derive analytical expressions for the harvesting interval, and then we provide an algorithm to describe the complete procedure. Furthermore, we incorporate delay-limited sources and investigate the impact of statistical queuing constraints on the energy-efficient allocation of operating intervals. We formulate an optimization problem that maximizes the system effective-EE while UEs are applying NOMA scheme for uplink information transfer. Since the problem satisfies pseudo-concavity, we provide an iterative algorithm using bisection method to determine the unique solution. In the numerical results, we observe that broadcasting at higher power level is more energy efficient for WPCN with uplink NOMA. Additionally, exponential decay QoS parameter has considerable impact on the optimal solution, and in the presence of strict constraints, more time is allocated for downlink interval under half-duplex operation with uplink TDMA mode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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