【摘要】 利用反馈的信道状态信息,可以使系统在获得分集增益的同时,又获得额外天线增益。因此,又可以根据是否采用反馈结构将TD技术分为开环和闭环两大类。现有的3G标准都在前向链路中采纳了不同的TD技术。更多还原

【Abstract】 In addition to diversity gain,anten na gain can also be incorpora ted thro ugh channel state feedback.This leads to the categorization of TD meth ods i nto open loop and closed loop methods.This article describes the concept of transmit diversi-ty and explains the features of TD techniques adopted by 3G systems.更多还原