Abstract: The inaccuracies of timing acquisition degrade the performance of Distributed Antenna Systems（DAS）. To improve the probability of correct acquisition, a cooperation verification method of distributed antennas is proposed. In the flat Rayleigh channels of linear cell, two distributed receive antennas are considered. By utilizing the prior information of the time-delays difference, a constraint of cooperation verification is firstly exploited. Then, the timing acquisition, which is based on the method of threshold detection, is performed at each distributed antenna. For eliminating the part of acquisition error, the cooperation verification and the post-processing of cooperation verification is pursued. By the analysis and simulations, it is shown that the probability of correct acquisition for each distributed antenna can be improved according to the proposed method.

Key words: timing acquisition, distributed antenna systems, linear cell, cooperation verification, detection threshold

摘要： 不精确的定时捕获造成分布式天线系统性能下降，为提高定时捕获时的正确捕获概率，提出分布式天线协同校验的定时捕获方法。在线形小区的平坦瑞利信道中考虑有两根分布式接收天线，根据时延差先验信息，建立协同校验的限制条件；然后，各分布式天线根据门限检测方法进行定时捕获；为去除部分定时捕获错误，各分布式天线在构建的限制条件下进行协同校验与校验后处理。分析与仿真结果表明，提出方法能有效地提高各分布式天线定时捕获时的正确捕获概率。

关键词: 定时捕获, 分布式天线系统, 线形小区, 协同校验, 检测门限