分布式天线协同感知的定时捕获

摘要

为提高定时捕获的正确捕获概率并降低漏检概率，提出一种基于分布式天线协同感知的定时捕获方法。该方法针对线形小区的平坦瑞利衰落信道场景，利用两根分布式接收天线接收来自单天线移动台的发射信号；根据中心处理器处的协同感知，确保各分布式接收天线的预定虚警概率，并为门限检测推导协同处理门限；各天线根据门限检测进行分布式天线系统的最大似然定时捕获。仿真结果表明，无论移动台处于线形小区的哪个位置，提出方法在不增加预定虚警概率的情况下，均能改善各分布式天线的正确捕获概率和漏检概率。%To increase the probability of correct acquisition and decrease the missed detection probability, a timing acquisition method with the cooperative sensing of distributed receive antennas is proposed. In the flat Rayleigh channels of linear cell, two distributed receive antennas are employed to receive the signal transmitted from the Mobile Station(MS)with a single antenna. This paper exploits the false alarm probability at the central processor to guarantee the false alarm probability at each distributed antenna. Based on the exploited probability of false alarm at the central processor, a cooperative detection threshold of each antenna is derived for threshold detection. According to the threshold detection, a Maximum-Likelihood(ML)-based timing acquisition method is proposed for Distributed Antenna Systems(DAS). Without increasing the pre-defined probability of false alarm, the analysis and simulation results show that the correct acquisition probability and the missed detection probability for each distrib-uted antenna can be improved with the proposed method wherever the MS is located.