DISTRIBUTED BEAMFORMING SYSTEM AND CARRIER SYNCHRONIZATION METHOD OF TRANSMITTING ANTENNAS AT SOURCE END THEREOF

摘要

The present invention is applicable to the technical field of wireless communications, and provides a distributed beamforming system and a carrier synchronization method of transmitting antennas at a source end thereof. In the present invention, transmitting antennas at a source end can accurately control timeslots, and can estimate frequencies and phases on received signals, and can estimate phase shift information caused by channel time delay. In the present invention, a broadcasting characteristic of a wireless link is fully utilized, and accurate synchronization of carrier frequencies and phases of a distributed beamforming system is implemented by using accurate timeslot control and channel estimation. Compared with the conventional carrier synchronization method, the present invention greatly reduces the synchronization overhead, and time slots needed for synchronization is decreased to from 2M-1 to M (M being the number of source-end base stations), thereby increasing the effective communications time of the system.