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Power Allocation in HARQ-based Predictor Antenna Systems
arXiv - CS - Information Theory Pub Date : 2020-04-03 , DOI: arxiv-2004.01421
Hao Guo, Behrooz Makki, Mohamed-Slim Alouini, Tommy Svensson

In this work, we study the performance of predictor antenna (PA) systems using hybrid automatic repeat request (HARQ). Here, the PA system is referred to as a system with two sets of antennas on the roof of a vehicle. In this setup, the PA positioned in the front of the vehicle can be used to predict the channel state information at the transmitter (CSIT) for data transmission to the receive antenna (RA) that is aligned behind the PA. Considering spatial mismatch, due to the vehicle mobility, we derive closed-form expressions for the optimal power allocation and the minimum average power of the PA systems under different outage probability constraints. The results are presented for different types of HARQ protocols and we study the effect of different parameters on the performance of PA systems. As we show, our proposed approximation scheme enables us to analyze PA systems with high accuracy. Moreover, for different vehicle speeds, we show that HARQ-based feedback can reduce the outage-limited power consumption of PA systems by orders of magnitude.

中文翻译:

基于 HARQ 的预测天线系统中的功率分配

在这项工作中,我们研究了使用混合自动重复请求 (HARQ) 的预测天线 (PA) 系统的性能。这里,PA系统是指在车顶上有两组天线的系统。在此设置中,位于车辆前方的 PA 可用于预测发射器 (CSIT) 处的信道状态信息,以便将数据传输到对准 PA 后面的接收天线 (RA)。考虑到空间失配,由于车辆的移动性,我们推导出了最优功率分配和 PA 系统在不同断电概率约束下的最小平均功率的闭式表达式。给出了不同类型 HARQ 协议的结果,我们研究了不同参数对 PA 系统性能的影响。正如我们所展示的,我们提出的近似方案使我们能够以高精度分析 PA 系统。此外,对于不同的车速,我们表明基于 HARQ 的反馈可以将 PA 系统的停电限制功耗降低几个数量级。
更新日期:2020-04-06
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