BAI Cheng-lin,CHENG Zhi-hui.A code-aided carrier synchronization algorithm based on improved nonbinary low-density parity-check codes[J].Optoelectronics Letters,2016,12(5):353-357 A code-aided carrier synchronization algorithm based on improved nonbinary low-density parity-check codes Author Name Affiliation BAI Cheng-lin  Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059, China  CHENG Zhi-hui  Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059, China  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. Hits: 3771 Download times: 0 View Full Text    Download reader