Multi-device selection scheduling in non-identically distributed fading channels
Multi-device selection scheduling in non-identically distributed fading channels
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DOI：
10.1049/iet-com.2015.0977
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发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
Y. Ko;A. Quddus;R. Tafazolli
中科院分区：
文献类型：
--
作者：
Y. Ko;A. Quddus;R. Tafazolli
为了提高多用户分集增益，克服机会调度方案的显著反馈要求，近年来文献中提出了多用户选择调度的概念。其主要思想是，减少反馈开销可以节省每个用户可能为数据传输增加的电力。在这项工作中，作者提出了将多用户选择原理与比例公平调度方案相结合的方法。这是特别针对功率有限，多设备系统在非相同分布衰落信道。在性能分析方面，分别导出了延迟敏感系统和延迟容忍系统的中断概率和平均系统速率的封闭表达式，并与全反馈多用户分集方案进行了比较。解析地给出了离散速率区域，在该区域中，通过适当地选择部分器件的数量，可以获得最大的平均系统速率。他们共同优化部分设备的数量和每个设备的节电，以便在功率要求下最大化平均系统速率。结果表明，在设备信道的非相同瑞利衰落情况下，利用节省的反馈功率进行数据传输的方案优于全反馈多用户分集。
Multiuser selection scheduling concept has been recently proposed in the literature in order to increase the multiuser diversity gain and overcome the significant feedback requirements for the opportunistic scheduling schemes. The main idea is that reducing the feedback overhead saves per-user power that could potentially be added for the data transmission. In this work, the authors propose to integrate the principle of multiuser selection and the proportional fair scheduling scheme. This is aimed especially at power-limited, multi-device systems in non-identically distributed fading channels. For the performance analysis, they derive closed-form expressions for the outage probabilities and the average system rate of the delay-sensitive and the delay-tolerant systems, respectively, and compare them with the full feedback multiuser diversity schemes. The discrete rate region is analytically presented, where the maximum average system rate can be obtained by properly choosing the number of partial devices. They optimise jointly the number of partial devices and the per-device power saving in order to maximise the average system rate under the power requirement. Through the authors’ results, they finally demonstrate that the proposed scheme leveraging the saved feedback power to add for the data transmission can outperform the full feedback multiuser diversity, in non-identical Rayleigh fading of devices’ channels.