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

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.

[1]  Erchin Serpedin,et al.  Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison , 2004, IEEE Transactions on Wireless Communications.

[2]  Steven Kay,et al.  Fundamentals Of Statistical Signal Processing , 2001 .

[3]  Jong-Wha Chong,et al.  A study of joint tracking algorithms of carrier frequency offset and sampling clock offset for OFDM-based WLANs , 2002, IEEE 2002 International Conference on Communications, Circuits and Systems and West Sino Expositions.

[4]  Ying Chen,et al.  Work in progress: A new preamble design and pattern matching aided timing synchronization for PLC , 2014, 9th International Conference on Communications and Networking in China.

[5]  Khaled Ben Letaief,et al.  A robust timing and frequency synchronization for OFDM systems , 2003, IEEE Trans. Wirel. Commun..

[6]  Donald C. Cox,et al.  Robust frequency and timing synchronization for OFDM , 1997, IEEE Trans. Commun..

[7]  Fabienne Nouvel,et al.  Analysis of PLC channels in aircraft environment and optimization of some OFDM parameters , 2013, ICSNC 2013.

[8]  Ki-Bum Kim,et al.  A new joint algorithm of symbol timing recovery and sampling clock adjustment for OFDM systems , 1998 .

[9]  Edouard Ivanjko,et al.  Technologies for distributed flight control systems: A review , 2015, 2015 38th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO).

[10]  Pierre Degauque,et al.  OFDM PLC transmission for aircraft flight control system , 2014, 18th IEEE International Symposium on Power Line Communications and Its Applications.

[11]  Chao Zhang,et al.  Robust Preamble Design for Synchronization, Signaling Transmission, and Channel Estimation , 2015, IEEE Transactions on Broadcasting.

[12]  Thierry Pollet,et al.  Synchronization with DMT modulation , 1999, IEEE Commun. Mag..

[13]  Yumin Lee,et al.  Novel sampling clock offset estimation for DVB-T OFDM , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[14]  Marc Moeneclaey,et al.  Synchronizability of OFDM signals , 1995, Proceedings of GLOBECOM '95.

[15]  J.-F. Helard,et al.  A novel joint and iterative scheme for synchronization and channel estimation in MC-CDMA power line communications , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[16]  Umberto Mengali,et al.  An improved frequency offset estimator for OFDM applications , 1999, IEEE Communications Letters.

[17]  Changyong Pan,et al.  On the synchronization techniques for wireless OFDM systems , 2006, IEEE Trans. Broadcast..

[18]  Luís Díez del Río,et al.  GEN01-4: Analysis of Timing Recovery for DMT Systems Over Indoor Power-Line Channels , 2006, IEEE Globecom 2006.