Improved FFT-Based Frequency Offset Estimation Algorithm for Coherent Optical Systems

Author

Yumin Liu ; Yunfeng Peng ; Shuang Wang ; Zonglong Chen

Author_Institution

Beijing Eng. & Technol. Res. Center for Convergence Networks & Ubiquitous Services, Univ. of Sci. & Technol. Beijing, Beijing, China

Volume

26

Issue

6

fYear

2014

fDate

15-Mar-14

Firstpage

613

Lastpage

616

Abstract

Algorithms of frequency offset (FO) estimation based on fast Fourier transform of the sample signal´s argument have been investigated, in which the FO estimation range is [-R_s/12, R_s/8] (R_s is the symbol rate). In this letter, an improved algorithm is proposed with the sign of FO being determined by means of an improved judging method. The estimation range of the proposed algorithm can be up to [-R_s/8,R_s/8], with the same accuracy as that of the previous algorithms being obtained, yet at the same time requiring very little additional computational burden.

Keywords

estimation theory; fast Fourier transforms; optical modulation; optical transmitters; quadrature amplitude modulation; quadrature phase shift keying; FO estimation; FO sign; coherent optical systems; estimation range; fast Fourier transform; improved FFT-based frequency offset estimation algorithm; improved judging method; sample signal argument; symbol rate; Estimation; Frequency estimation; Frequency modulation; OFDM; Optical modulation; Phase shift keying; Signal to noise ratio; Coherent optical communication; fast Fourier transform (FFT); frequency offset estimation; quadrature amplitude modulation (QAM); quadrature phase shift keying (QPSK);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2301796

Filename

6718054