Device and method for estimating carrier frequency offset of OFDM signals transmitted and received through plurality of polarized antennas

摘要

Provided are a device and method for estimating carrier frequency offset of OFDM signals transmitted and received through a plurality of polarized antennas that may accurately estimate carrier frequency offset used for carrier frequency synchronization acquisition when there is interference between polarized waves.

主权项

1. A device for estimating carrier frequency offset of Orthogonal Frequency Division Multiplexing signals transmitted and received through a plurality of polarized antennas, the device comprising:
a phase-shift calculating unit configured to calculate antenna phase shift values of Orthogonal Frequency Division Multiplexing signals respectively received from the plurality of polarized antennas due to interference between antennas; and an offset estimating unit configured to remove phase shifts due to interference between antennas from the antenna phase shift values due to interference between antennas calculated by the phase-shift calculating unit, remove an effect of fast fading, and estimate carrier frequency offset values; wherein the phase-shift calculating unit includes: n phase delaying units configured to delay phases of a first half the Orthogonal Frequency Division Multiplexing signals respectively received from n polarized antennas, respectively; n first group multiplication units configured to respectively multiply a first half of phased-delayed Orthogonal Frequency Division Multiplexing signals respectively phase-delayed by the phase delaying units by a first half pattern of a training symbol known in advance; and n second group multiplication units configured to respectively multiply a second half pattern of non-phase-delayed Orthogonal Frequency Division Multiplexing signals by a second half pattern of the training symbol known in advance.