Downlink Non-Orthogonal Multiple Access With Limited Feedback
Downlink Non-Orthogonal Multiple Access With Limited Feedback
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DOI：
10.1109/twc.2017.2720169
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发表时间：
2017-01
影响因子：
10.4
通讯作者：
X. Liu;H. Jafarkhani
中科院分区：
文献类型：
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作者：
X. Liu;H. Jafarkhani
在本文中，我们分析了反馈有限的下行链路非正交多址（NOMA）网络。我们的目标是基于来自接收器的分布式信道反馈信息，导出用于速率自适应的适当传输速率，并最小化恒定速率数据服务的最小速率的中断概率。我们提出了一种具有可变长度编码的高效量化器，可以在完美信道状态信息随处可用的情况下达到最佳性能。我们证明，在具有两个接收器的典型应用中，最小速率的损耗和中断概率至少随最小反馈速率呈指数衰减。我们分析了分集增益，为量化器实现最大分集阶数提供了充分条件。对于具有 $K$ 接收器且 $K > 2$ 的 NOMA，我们以 $O\left ({K\log \frac {1}{\epsilon }}\right )$ 的时间复杂度在 $\epsilon $ 的精度内解决最小速率最大化问题，然后，我们将之前提出的 $K = 2$ 的量化器应用于 $K > 2$ 的情况。数值模拟旨在证明我们提出的量化器的效率和分析结果的准确性。
In this paper, we analyze downlink non-orthogonal multiple access (NOMA) networks with limited feedback. Our goal is to derive appropriate transmission rates for rate adaptation and minimize outage probability of minimum rate for the constant-rate data service, based on distributed channel feedback information from receivers. We propose an efficient quantizer with variable-length encoding that approaches the best performance of the case where perfect channel state information is available everywhere. We prove that in the typical application with two receivers, the losses in the minimum rate and outage probability decay at least exponentially with the minimum feedback rate. We analyze the diversity gain and provide a sufficient condition for the quantizer to achieve the maximum diversity order. For NOMA with $K$ receivers where $K > 2$ , we solve the minimum rate maximization problem within an accuracy of $\epsilon $ in time complexity of $O\left ({K\log \frac {1}{\epsilon }}\right )$ , and then, we apply the previously proposed quantizers for $K = 2$ to the case of $K > 2$ . Numerical simulations are presented to demonstrate the efficiency of our proposed quantizers and the accuracy of the analytical results.