Pilot-based extended Kalman filter for phase noise estimation in CO-FBMC/OQAM systems

Abstract we proposed a pilot-based extended Kalman filter (P-EKF) scheme for phase noise estimation in offset-QAM-based filterbank multicarrier (FBMC–OQAM) systems with a large number of subcarriers. The performance of the P-EKF scheme with rectangular QAM modulations is evaluated in optical transmission system, including fiber dispersion, nonlinearity, frequency offset and so on. The performance is analyzed in 16-QAM 20Gbaud CO-FBMC/OQAM system with 400 km single mode fiber. The results show that P-EKF can achieve 1 . 216 × 1 0 − 2 normalized linewidth tolerance ( 4 . 48 × 1 0 − 3 of blind-extended Kalman filter (B-EKF) and 2 . 24 × 1 0 − 3 of modified blind phase search (M-BPS)) at the bit error rate (BER) of 3 . 8 × 1 0 − 3 , while keeping a low amount of calculation (for every iteration, the real multiplication and real addition are both 5). Besides, P-EKF can compensate ∓ 3500 kHz residual frequency offset at the BER of 3 . 8 × 1 0 − 3 when the optical signal-to-noise ratio is 25dB, which makes it very suitable to apply to the real DSP module.