Compensation of Frequency Offset for Differentially Encoded 16-and 64-QAM in the Presence of Laser Phase Noise.
IEEE PHOTONIC TECH L
176 - 178.
The compensation of frequency offset for differentially encoded 16- and 64-ary quadrature amplitude modulation (QAM) in the presence of laser phase noise is investigated. Differential encoding is employed to solve the four-fold phase ambiguity problem in a nondata-aided transmission system with square QAM constellations. Simulation results show that frequency offset and phase noise can successfully be compensated using a second-order digital filter loop for the square QAM constellations.
|Title:||Compensation of Frequency Offset for Differentially Encoded 16-and 64-QAM in the Presence of Laser Phase Noise|
|Keywords:||Differential encoding (DE), frequency offset, phase recovery, quadrature amplitude modulation (QAM), FEEDFORWARD CARRIER RECOVERY, COHERENT, TRANSMISSION, RECEIVER, SYSTEM|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
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