Exploiting Power Adaptation With Transmit Antenna Selection for Interference-Outage Constrained Underlay Spectrum Sharing
Exploiting Power Adaptation With Transmit Antenna Selection for Interference-Outage Constrained Underlay Spectrum Sharing
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DOI：
10.1109/tcomm.2019.2950680
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发表时间：
2020-01-01
影响因子：
8.3
通讯作者：
Mehta, Neelesh B.
中科院分区：
文献类型：
--
作者：
Sarvendranath, Rimalapudi;Mehta, Neelesh B.
在干扰频谱共享中，干扰约束限制同时接入频谱的次发射机的传输，以保护主用户免受过度干扰。发射天线选择使得次级用户能够使用低复杂度硬件来克服由干扰约束所施加的限制。我们开发了一个最佳的和新颖的联合天线选择和功率自适应规则，最大限度地减少了平均符号错误概率（SEP）的二级用户，这是受到两个实际上动机良好的约束。第一个是研究较少但通用的干扰中断约束，它限制了主接收机处的干扰功率超过阈值的可能性。第二约束限制辅发射机的峰值发射功率。我们表明，干扰中断约束的最佳规则有一个新的结构，这是显着不同的文献中考虑的规则。然后，我们提出了一个有见地的几何解释其结构。利用这一点，我们还提出了一个实际上适合和接近最优的最佳规则称为线性规则的变体，并分析其性能。我们的数值结果表明，最佳规则减少了一至两个数量级的平均SEP相比，在文献中的规则。
In underlay spectrum sharing, the interference constraint limits transmissions by the secondary transmitter, which concurrently accesses the spectrum, to protect the primary user from excessive interference. Transmit antenna selection enables a secondary user to overcome the limitations imposed by the interference constraint using low-complexity hardware. We develop an optimal and novel joint antenna selection and power adaptation rule that minimizes the average symbol error probability (SEP) of a secondary user that is subject to two practically well-motivated constraints. The first is the less-studied but general interference-outage constraint, which limits the probability that the interference power at the primary receiver exceeds a threshold. The second constraint limits the peak transmit power of the secondary transmitter. We show that the optimal rule for the interference-outage constraint has a novel structure that is markedly different from the rules considered in the literature. We then present an insightful geometric interpretation of its structure. Using this, we also propose a practically amenable and near-optimal variant of the optimal rule called the linear rule, and analyze its performance. Our numerical results show that the optimal rule reduces the average SEP by one to two orders of magnitude compared to the rules in the literature.