Fatadin, I; Ives, D J; Savory, S J* (2010) Compensation of frequency offset for differentially Encoded 16- and 64-QAM in the presence of laser phase noise. IEEE Photonics Technol. Lett., 22 (3). pp. 176-178.

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Abstract

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.

Item Type:	Article
Subjects:	Optical Radiation and Photonics Optical Radiation and Photonics > Optical Comms. And Data
Last Modified:	02 Feb 2018 13:15
URI:	https://eprintspublications.npl.co.uk/id/eprint/4575