Title :
A modified carrier phase estimation algorithm for square m-QAM based optical coherent systems
Author :
Liu, Jihong ; Li, Yang ; Li, Guang
Author_Institution :
Sch. of Electron. Eng., Xi´´an Univ. of Posts & Telecommun., Xi´´an, China
Abstract :
A modified carrier phase estimation algorithm based on Viterbi-Viterbi phase estimation method is proposed for high-level square QAM-based optical coherent systems. All of the received symbols are used to estimate the carrier phase in order to enhance the tolerance of laser phase noise. Compared to the previous algorithms, the computation complexity of the proposed algorithm is lower and does not depend on the modulation levels. The simulation results show that 1 dB SNR penalty is induced with the linewidths of 1, and 0.3 MHz per laser for square 16-and 64-QAM, respectively.
Keywords :
maximum likelihood estimation; optical communication; phase estimation; quadrature amplitude modulation; SNR penalty; Viterbi-Viterbi phase estimation method; computation complexity; frequency 0.3 MHz; high-level square m-QAM-based optical coherent system; modified carrier phase estimation algorithm; Complexity theory; Laser noise; Optical modulation; Phase estimation; Phase noise; Signal to noise ratio; Simulation; carrier phase estimation; coherent optical communication; laser linewidth; quadrature amplitude modulation (QAM);
Conference_Titel :
Systems and Informatics (ICSAI), 2012 International Conference on
Conference_Location :
Yantai
Print_ISBN :
978-1-4673-0198-5
DOI :
10.1109/ICSAI.2012.6223337
