Frequency-Selective Multiuser Downlink Channels Under Mismatched Coherence Conditions
Frequency-Selective Multiuser Downlink Channels Under Mismatched Coherence Conditions
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DOI：
10.1109/tcomm.2018.2878692
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发表时间：
2019-03
影响因子：
8.3
通讯作者：
Mohamed Fadel;Aria Nosratinia
中科院分区：
文献类型：
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作者：
Mohamed Fadel;Aria Nosratinia
下行链路传输到经历不同相干带宽和相干时间的频率选择性链路具有明显的实际相关性，但通常通过假设所有用户对应于最快、最分散的用户的相干条件来解决。本文展示了一种替代方法，该方法直接利用频率选择条件下用户的相干带宽和相干时间之间的差异，表明它可以带来显着的新效率和增益。更具体地说，我们研究了链路质量之间存在差异的三种广泛条件下的双用户下行链路频率选择性信道：当差异存在于相干时间、相干带宽以及相干时间和相干带宽两者时。每个连贯性场景都需要不同的处理；对于每一个，我们都提供了分析，证明了由于利用一致性差异而可实现的速率的收益。数值模拟证明了所提出方案的优点。
Downlink transmission into frequency-selective links experiencing different coherence bandwidths and coherence times has obvious practical relevance, but is often addressed via assuming for all users the coherence conditions corresponding to the fastest, most dispersive user. This paper demonstrates an alternative approach that directly exploits the differences between coherence bandwidth and coherence time of users under frequency-selective conditions, showing that it can lead to significant new efficiencies and gains. More specifically, we study a two-user downlink frequency-selective channel under three broad conditions of disparity between the link qualities: when the disparity is in coherence time, in coherence bandwidth, and in both coherence time and coherence bandwidth. Each of the coherence scenarios calls for a distinct treatment; for each, we provide an analysis demonstrating the gains in achievable rates due to exploiting coherence disparity. Numerical simulations demonstrate the advantages of the proposed schemes.