出版社：Electronics and Telecommunications Research Institute
摘要：As an alternative to the traditional pilot-aided orthogonal frequency division multiplexing (OFDM), the time-domain pseudonoise (PN)-padded OFDM provides a higher spectral efficiency. However, the carrier frequency offset (CFO) attenuates peaks of the conventional PN correlation output, which limits the CFO estimation range of the OFDM synchronizer. An improved correlation is proposed in this letter to remove the CFO-induced amplitude attenuation of correlation peaks. For a synchronizer adopting the designed correlator, a larger range of CFO acquisition is obtained through using wider correlation windows with a smaller interval between them. The proposed method of CFO acquisition is verified in a digital terrestrial multimedia broadcast receiver, in which the synchronizer is able to acquire CFOs up to kHz in the DVB-T F1 channel. Furthermore, the acquisition range can be expanded in more favorable channels.
关键词：Orthogonal frequency division multiplexing (OFDM);carrier frequency offset (CFO);composite PN correlation (CPC);DTMB
