Study on an efficient fractional frequency offset estimation for OFDM systems with roll-off period

In this paper, we propose an efficient FFO(fractional frequency offset) estimation method for OFDM systems with RP(Roll-off period). RP is used to transmit more subcarriers in a limited bandwidth. Because neighboring OFDM symbols overlap in RP region, RP makes noises in CP(cyclic prefix) and degrades FFO estimation when Beek's method is used. The proposed method estimates FFO based on the Beek's method by detecting and eliminating RP from CP. We showed the test results of RP detection and explained the proposed FFO estimation.