超宽带拓展距离应用的研究综述

摘要

At present, UWB systems are mainly used for short distance applications.In order to extend the application field,some researches have been carried out on the range extension of UWB systems.Accordingly, this paper made a survey of these researches, described the application scenarios of U WB long-distance communications, and based on the principle analysis,example demonstration and difficulty exploration, introduced six strategies for the range extension of UWB communications,which were the reduction of the communication rate, the use of directional antennas, the use of MIMO antennas, the use of cooperative communication or multi-hop transmission, the use of multi-tap RAKE receiver, and the breakthrough of the power spectral density limit.The survey can serve as important reference for the implementation scheme selection of UWB long-distance communications.%目前,超宽带(UWB)系统主要局限于短距离应用,为了扩展其应用领域,一些有关拓展UWB通信距离的研究逐步展开.针对这些研究进行了综述,描述了UWB远距离通信的应用场景,并通过原理分析、实例论证和难点探讨,具体介绍了拓展UWB通信距离的六种策略,包括降低通信速率、使用定向天线、使用MIMO天线、使用协作通信或多跳传输、使用多抽头数的RAKE接收机以及突破功率谱密度限制,为UWB远距离通信的实现方案选型提供了重要参考.