TWA-based channel estimation for CO-OFDM systems

Abstract

An efficient channel estimation method called time-domain weighted average (TWA) algorithm is proposed for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. On the premise of calculating the associated weight of channel transfer function, a more exact channel characteristic is obtained by calculating the weighted average of the pilot transfer function in this algorithm. Compared with time-domain average (TA) algorithm, the TWA algorithm can reach the same bit error rate (BER) with fewer pilots, and it improves the performance of CO-OFDM systems.

Keywords

Orthogonal Frequency Division Multiplex / Channel Estimation / Training Sequence / Orthogonal Frequency Division Multiplex Symbol / Pilot Symbol

References

[1] DuL B, LoweryA J. IEEE Photonics Technology Letters, 2010, 22: 320

[2] LiJ, ZhaoC, ZhangS, ZhangF, ChenZ. IEEE Photonics Technology Letters, 2010, 22: 1814

[3] ZhangS, BaiC, LuoQ, HuangL, ZhangX. Optoelectronics Letters, 2013, 9: 124

[4] PengL, YounC-H, QiaoC. IEEE Communications Letters, 2013, 17: 789

[5] XuY, LiL, HanS, HuG. Journal of Optoelectronics ·Laser, 2012, 23: 1901

[6] WangD, ZouN, WangW, ZhangY. Optoelectronics Letters, 2013, 9: 217

[7] XuY, LiL, HanS, HuG. Journal of Optoelectronics ·Laser, 2013, 24: 1090

[8] YangQ, KanedaN, LiuX, ShiehW. IEEE Photonics Technology Letters, 2009, 21: 1544

[9] WangZ, QiaoY, JiY. The Chromatic Dispersion Estimation and Compensation based on Training Symbols in CO-OFDM System, 3rd IEEE International Conference on Broadband Network and Multimedia Technology, Beijing, 2010, 354

[10] HuangW-C, LiC-P, LiH-J. IEEE Transactions on Wireless Communications, 2012, 11: 4006

[11] BarhumiI, LeusG, MoonenM. IEEE Transactions on Signal Processing, 2003, 51: 1615

[12] ZhaoW, WanQ, ChenZ. Journal on Communication, 2013, 34: 175

This work has been supported by the National Natural Science Foundation of China (No.61177066).