In future wireless systems, a large number of users may access the networks via moving relays (MRs) installed on top of vehicles. One of the main challenges of MRs is rapid channel variation which may make channel estimation, and its following procedures, difficult. To address these issues, various schemes are designed, among which predictor antenna (PA) is a candidate. The PA setup refers to a system with two (sets of) antennas on top of a vehicle, where the PA(s) positioned in front of the vehicle is(are) utilized to predict the channel state information required for data transmission to the receive antennas (RAs) aligned behind the PA. In this paper, we introduce the concept and the potentials of PA systems. Moreover, summarizing the field trials for PAs and the 3GPP attempts on (moving) relays, we compare the performance of different PA and non-PA methods for vehicle communications in both urban and rural areas with the PA setup backhauled through terrestrial or satellite technology, respectively. As we show, with typical parameter settings and vehicle speeds, a single-antenna PA-assisted setup can boost the backhaul throughput of MRs, compared to state-of-the-art open-loop schemes, by up to 50%.
翻译:在未来的无线系统中,许多用户可以通过车辆上方安装的移动式继电器(MRs)进入网络。调频器的主要挑战之一是快速的频道变换,这可能会使频道估计频道以及其后续程序变得困难。为了解决这些问题,设计了各种计划,其中预测天线(PA)是一个候选方案。PA的设置是指车辆上方有两套(一套)天线的系统,在车辆前方设置的PA系统,用来预测数据传输到接收天线所需的频道状态信息。在本文件中,我们介绍了PA系统的概念和潜力。此外,概述了PA的实地试验和3GPP在(移动)中继的尝试,我们将城市和农村地区不同的PA和非PA车辆通信方法的性能与PA分别通过地面或卫星技术建立起来的后台。我们用典型的参数设置和车辆速度显示,一个单一的ANTANPA辅助装置可以推进MRPO的后台计划,而通过MRPO的后端计划,通过MVPO的后端计划,我们通过开放地将PA-%的后端计划加以推进。