Low Complex OFDM Synchronization in Power Line Communication for Flight Control System in Aircraft

Abstract The flight control system (FCS) over power line communication (PLC) is subject to strong real time constraints and harsh aircraft operating conditions. Then, low complex and accurate synchronization procedure have to be adapted. In this paper, we propose a synchronization procedure performed in two phases and we focus on the operating phase with a synchronization using the received data to estimate the sampling frequency offset. This estimation is performed by using two estimators based on the maximum likelihood principle. The first estimator performs the estimation on one orthogonal frequency division multiplexing (OFDM) transmission symbol. The second estimator performs the estimation on 20 successive OFDM symbols and uses the estimation of the previous estimator. The performances of the estimator are compared to the Cramér-Rao lower bound (CRLB). The proposed synchronization procedure reached the CRLB and satisfies the FCS constraints over PLC.

Keywords PLC, OFDM, avionics, aircraft, sampling frequency synchronization, Cramér-Rao lower bound, maximum likelihood, safety critical systems, HVDC network.

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