Timing Acquisition for Distributed Antenna Systems with the Cooperation of Two Remote Antennas

In the coverage region of Distributed antenna systems (DAS), two Remote antennas (RA) are assumed at the Base station (BS) for receiving the signal transmitted from the Mobile station (MS) with a single antenna. Since the locations of the two RAs at BS are fixed, a constraint, which is exploited to associate the time delays from the MS to the two RAs, is derived from the known locations of the two RAs. With this constraint, we propose a maximum-likelihood (ML)-based Cooperative timing acquisition (CTA) method. Compared to the Independent timing acquisition (ITA) for each RA, the analysis and simulation results show that the Probability of correct acquisition (PCA) for each RA can be improved by the cooperation of the two RAs.