基于D2D链路的测量与建模.doc

基于D2D链路的测量与建模 Abstract: Channel measurements and modelling have been long considered as the foundation for effective and efficient wireless communication system designs. Recently, there has been an explosive growth of research work dedicated to the so-called device-to-device (D2D) communications. In the mean time, however, measurements and modelling of D2D channels seem to somewhat fall behind. To promote research on these aspects, in this study, the authors provide a critical overview of the current state of research on D2D channels, and comprehensively discuss future trends and research directions. 摘要：信道测量与建模被长期作为无线通信系统设计实用性和高效性的基础。近年，对于所谓device-to-device（D2D）通信的研究工作呈现出爆发式增长，但同时关于D2D信道的测量与建模看起来没有同步进行。为了加深对于这些方向上的研究，本文中作者对D2D信道的当前研究现状做出客观的综述，并概要地讨论了未来趋势和研究方向。 1.introduction 1.简介 In recent years, device-to-device (D2D) communications have gained much attention to meet the increasing demand of wireless data service in spite of the increasingly scarce frequency spectrum [1]. The D2D communications are defined as the information exchange via a direct link between the end users, as opposed to transmitting and receiving signals through the cellular base station (BS). D2D communications behave as an underlay to the cellular network, which can achieve cellular controlled short-range direct data transmission for local area services by reusing the cellular spectrum, leading to both spectral efficiency improvement and cell throughput enhancement [2]. In traditional cellular networks, the radio resource in a cell can be allocated to only one cellular user equipment (UE) link. However, in cellular networks with D2D capability, multiple D2D links can share a resource block by spatially reusing the resource block within a cell. As a matter of fact, the D2D concept has been proposed long time ago for ad hoc networks, for example, WLAN and vehicular networks. Recently, the roadside infrastructure controlled D2D concept has been first proposed for vehicular c