Open AccessA performance investigation of correlation-based and pilot-tone-assisted frequency offset compensation method for CO-OFDM
Author(s) -
Shengjiao Cao,
Yu Chen,
Pooi Yuen Kam
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.022847
Subject(s) - orthogonal frequency division multiplexing , cyclic prefix , offset (computer science) , frequency offset , algorithm , phase noise , computer science , carrier to noise ratio , mathematics , channel (broadcasting) , electronic engineering , telecommunications , engineering , programming language
We carry out a comprehensive analysis to examine the performance of our recently proposed correlation-based and pilot-tone-assisted frequency offset compensation method in coherent optical OFDM system. The frequency offset is divided into two parts: fraction part and integer part relative to the channel spacing. Our frequency offset scheme includes the correlation-based Schmidl algorithm for fraction part estimation as well as pilot-tone-assisted method for integer part estimation. In this paper, we analytically derive the error variance of fraction part estimation methods in the presence of laser phase noise using different correlation-based algorithms: Schmidl, Cox and Cyclic Prefix based. This analytical expression is given for the first time in the literature. Furthermore, we give a full derivation for the pilot-tone-assisted integer part estimation method using the OFDM model.