An effective sampling clock synchronization method for continuous- and burst-mode transmission in OFDMA-PONs

Abstract A sampling frequency offset (SFO) estimation and compensation method based on frequency domain correlation of long training symbols for orthogonal frequency division multiple access passive optical network (OFDMA-PON) is experimentally demonstrated, which shows excellent performances in transmissions of continuous- and burst-mode. For continuous-mode transmission under a certain SFO, the proposed scheme can perform effectively in a wide received optical power (RoP) range from −8 dBm to −2 dBm and has high estimation veracity and a large applicable range as large as 100 ppm at a certain RoP. Similar behavior is also demonstrated under burst-mode transmission with tiny performance degradation caused by the fact that the algorithm needs time to reach a stable status of synchronization.

[1]  Murat Torlak,et al.  Joint CFO and SFO Estimator for OFDM Receiver Using Common Reference Frequency , 2016, IEEE Transactions on Broadcasting.

[2]  J. M. Tang,et al.  First experimental demonstrations of real-time optical OFDMA PONs with adaptive dynamic bandwidth allocation and colorless ONUs , 2012, 2012 Future Network & Mobile Summit (FutureNetw).

[3]  Bo Hu,et al.  A Low-Complexity ML Estimator for Carrier and Sampling Frequency Offsets in OFDM Systems , 2014, IEEE Communications Letters.

[4]  R P Giddings,et al.  Record-high and robust 17.125 Gb/s gross-rate over 25 km SSMF transmissions of real-time dual-band optical OFDM signals directly modulated by 1 GHz RSOAs. , 2014, Optics express.

[5]  Xue Chen,et al.  Joint scheme for symbol, sampling clock, and carrier frequency synchronization in PDM-CO-OFDM system beyond 100 Gb/s , 2014 .

[6]  Tho Le-Ngoc,et al.  RLS-Based Joint Estimation and Tracking of Channel Response, Sampling, and Carrier Frequency Offsets for OFDM , 2009, IEEE Transactions on Broadcasting.

[7]  Tho Le-Ngoc,et al.  Joint Channel Estimation and Synchronization for MIMO–OFDM in the Presence of Carrier and Sampling Frequency Offsets , 2009, IEEE Transactions on Vehicular Technology.

[8]  Qianwu Zhang,et al.  Cost-effective sampling clock synchronisation scheme with its implementation in optical orthogonal frequency division multiplexing systems , 2014, IET Commun..

[10]  Tho Le-Ngoc,et al.  Turbo Joint Decoding, Synchronization and Channel Estimation for Coded MIMO-OFDM Systems , 2008, 2008 IEEE International Conference on Communications.

[11]  Paul H. Moose,et al.  A technique for orthogonal frequency division multiplexing frequency offset correction , 1994, IEEE Trans. Commun..

[12]  Xi Chen,et al.  A simple sampling clock synchronization method for filter-based OFDM-FDMA systems , 2013 .