Research on the transmission performance of turbo codes in DDO-OFDM system

Abstract

A direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) system using turbo codes is built, and the transmission performance comparison between coded system and uncoded system is analyzed. Three decoding algorithms, which are Log-maximum a posteriori (MAP), Max-Log-MAP and threshold Max-Log-MAP, are used in the turbo coded system. By comparing three decoding algorithms, the system using Max-Log-MAP algorithm has the best bit error rate (BER) performance. At the transmission distance of 240 km, the uncoded system with transmission rate of 30 Gbit/s can get the BER performance at the degree of 8.93×10⁻³ with optical signal to noise ratio (OSNR) of 24 dB, while the turbo coded system with transmission rate of 50 Gbit/s can achieve it within OSNR of 20 dB.

Keywords

Orthogonal Frequency Division Multiplex / Orthogonal Frequency Division Multiplex System / Turbo Code / Decode Algorithm / Transmission Distance

References

[1] ZhangH, GaoX, ZhangJ, DengM, QiuK. Journal of Optoelectronics·Laser, 2013, 24: 493

[2] BerrouC, GlavieuxA, ThitimajshimaP. Near Shannon Limit Error-Correcting Coding and Decoding: Turbo-Codes, IEEE International Conference on Communications, 1993, 2: 1064

[3] PrabaS J V, VijayalakshmiK. International Journal of Innovative Research and Development, 2013, 2: 348

[4] WuY, FuY, HuangT. Journal of ChongQing University (Natural Science Edition), 2004, 9: 49

[5] LeeS H, KwonJ K. IEEE Photonics Technology Letters, 2012, 24: 1463

[6] WeiX, GuijunH, QingD. Optics Communications, 2008, 281: 1118

[7] CaoZ, YuJ, XiaM, TangQ, GaoY, WangW, ChenL. Journal of Lightwave Technology, 2010, 28: 2423

[8] WangZ, ParhiK K. IEEE Transactions on Communications, 2003, 51: 570

[9] XuC, LiangD, SugiuraS, NgS X, HanzoL. IEEE Transactions on Communications, 2013, 61: 1415

[10] ChenM, XiaoJ, ChenL, CaoZ, ChenJ, WuX, YanG. Journal of Optoelectronics ·Laser, 2013, 24: 63