Proportional Fair Scheduling with Superposition Coding in a Cellular Cooperative Relay System
Proportional Fair Scheduling with Superposition Coding in a Cellular Cooperative Relay System
复制标题
蜂窝协作中继系统中叠加编码的比例公平调度
DOI：
10.1007/s12243-012-0337-4
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Petar Popovski and Hideaki Sakai
中科院分区：
文献类型：
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作者：
Megumi Kaneko;Kazunori Hayashi;Petar Popovski and Hideaki Sakai
蜂窝协作中继系统中的吞吐量和公平性优化问题已成为研究的热点。首先考虑两用户中继广播信道，我们设计了一种基于叠加编码（SC）的方案，该方案在比例公平性约束下最大化可达和速率。与大多数中继方案中的用户被分配正交，我们的计划服务的两个用户同时在同一时间频率资源单元上叠加到三个SC层的消息。通过分析得出了各SC层的最优功率分配参数。接下来，我们考虑一般的多用户情况下，在蜂窝中继系统中，我们设计的资源分配算法的基础上比例公平调度利用建议的SC为基础的计划。数值结果表明，所提出的算法允许同时用户分配优于传统的基于正交用户分配的调度器，无论是在吞吐量和比例公平性。这些结果为未来无线资源分配和调度算法的设计指明了新的方向。
Many works have tackled on the problem of throughput and fairness optimization in cellular cooperative relaying systems. Considering firstly a two-user relay broadcast channel, we design a scheme based on superposition coding (SC) which maximizes the achievable sum-rate under a proportional fairness constraint. Unlike most relaying schemes where users are allocated orthogonally, our scheme serves the two users simultaneously on the same time-frequency resource unit by superposing their messages into three SC layers. The optimal power allocation parameters of each SC layer are derived by analysis. Next, we consider the general multi-user case in a cellular relay system, for which we design resource allocation algorithms based on proportional fair scheduling exploiting the proposed SC-based scheme. Numerical results show that the proposed algorithms allowing simultaneous user allocation outperform conventional schedulers based on orthogonal user allocation, both in terms of throughput and proportional fairness. These results indicate promising new directions for the design of future radio resource allocation and scheduling algorithms.