APPARATUS AND METHOD FOR CHANNEL ESTIMATION AND SYNCHRONIZATION IN OFDM/OFDMA RELAY SYSTEM

摘要

Provided are an apparatus and method for channel estimation and synchronization in an orthogonal frequency division multiplexing (OFDM)/ orthogonal frequency division multiplexing access (OFDMA) relay system. When data is received through a relay, channel estimation performance deterioration due to propagation delay can be improved in a transparent relay system or a cooperative relay system by extracting pilot signals based on a signal received from transmitters to a mobile station, estimating propagation delay between each of the transmitters, that transmitted the extracted pilot signals, and the mobile station based on the extracted pilot signals and preset reference pilot signals, and estimating a channel between the corresponding transmitter and the mobile station by estimating propagation delay weight of the corresponding transmitter based on the estimated propagation delay. Also, effects of a carrier frequency offset and timing offset of a link between the corresponding transmitter and the mobile station can be removed by storing the existing carrier frequency offset and timing offset of each transmitter, when the mobile station receives a signal, identifying a transmitter that transmitted the signal, and compensating the signal by using the stored carrier frequency offset and timing offset of the identified transmitter.