A code-aided carrier synchronization algorithm based on improved nonbinary low-density parity-check codes

Abstract

In order to further improve the carrier synchronization estimation range and accuracy at low signal-to-noise ratio (SNR), this paper proposes a code-aided carrier synchronization algorithm based on improved nonbinary low-density parity-check (NB-LDPC) codes to study the polarization-division-multiplexing coherent optical orthogonal frequency division multiplexing (PDM-CO-OFDM) system performance in the cases of quadrature phase shift keying (QPSK) and 16 quadrature amplitude modulation (16-QAM) modes. The simulation results indicate that this algorithm can enlarge frequency and phase offset estimation ranges and enhance accuracy of the system greatly, and the bit error rate (BER) performance of the system is improved effectively compared with that of the system employing traditional NB-LDPC code-aided carrier synchronization algorithm.

References

[1] FaouziB., AchrefM., SofièneA.. IEEE Transactions on Wireless Communications, 2015, 14: 2513

[2] YuanJ.-g, BiW.-j, HuY.-x, Pangy, LinJ.-z. Journal of Optoelectronics·Laser, 2014, 25: 259

[3] QiaoY.-j, YangQ.-h, LiM., XuY.-f, JiY.-f. Optics Communications, 2014, 332: 182

[4] JeanT.E.M.G.A., LiuD.-m, ZhangM.-m. Front. Optoelectron., 2014, 14: 3

[5] LiM.-h, ChenR.-t, BaiB.-m, MaX.. A Low-complexity Joint Noncoherent Demodulation/ Decoding Algorithm for Nonbinary LDPCcoded Differential Modulation Systems, IEEE China Summit & International Conference on Signal & Information Processing, 2013, 403

[6] DouQ. G., GaoJ.. IET Communications, 2012, 6: 1685

[7] KeJ., XuH., WangA.-f. Performance Analysis of EM-based Iterative SNR Estimation for Coded Signals, 2012, 1384

[8] LiZ.-x, WuN., WangH., ZhaoH.-j, KungJ.-m. Transactions of Beijing Institute of Technology, 2015, 35: 294

[9] ManX., XiZ.-p, GaoK., ZhangE.-y. IEEE Communications Letters, 2013, 17: 405

[10] ZhangZ.-p, GaoZ.-j, XuJ.-h. Journal of University of Electronic Science and Technology of China, 2011, 40: 825

[11] ShiZ.-p, TangF.-j, YanH., GongW.-c. Journal of Electronics & Information Technology, 2011, 33: 2506

[12] ZhuY.-g, YaoF.-q, LiuY.-x, ZhangY., PengW.. Systems Engineering and Electronics, 2011, 33: 427

[13] WangL.-z, TangX.-f, ZhangX., ZhangX., XiL.-x. Chinese Journal of Lasers, 2014, 41: 1

[14] GaoZ.-j. Code-aided Single Carrier Timing and Carrier Synchronization Algorithm for MQAM, 2011, 36

[15] ChengZ.-h, BaiC.-l, LuoQ.-l, SunW.-t. Journal of Optoelectronics·Laser, 2015, 26: 1094

[16] ZhangY.-q, IvanB. D.. Multilevel Nonbinary LDPC-coded Modulation for High-speed Optical Transmissions, 2014, Shanghai, IEEE ACP