Frequency Offset Estimation for Optical Coherent M-QAM Detection Using Chirp z-Transform

Author

Leng, Haijun ; Yu, Song ; Li, Xin ; Lan, Mingying ; Liao, Ping ; Wang, Tianyi ; Gu, Wanyi

Author_Institution

State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China

Volume

24

Issue

9

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

787

Lastpage

789

Abstract

The chirp z-Transform (CZT) is introduced to replace the traditional gradient descent (GD) in frequency offset estimation for digital coherent quadrature amplitude modulation reception. Different from GD, CZT is not sensitive to the changes of the parameters and is free of uncertain latency that GD suffers. The implementation of frequency offset estimator based on CZT is presented and numeric simulations demonstrate that CZT can reach the same accuracy as GD. The computation complexity of CZT is analyzed and is roughly equivalent to GD with three iterations.

Keywords

chirp modulation; frequency estimation; light coherence; optical modulation; quadrature amplitude modulation; chirp z-transform; computation complexity; digital coherent quadrature amplitude modulation reception; frequency offset estimation; gradient descent; optical coherent M-QAM detection; Accuracy; Complexity theory; Estimation; Frequency estimation; Frequency modulation; Signal to noise ratio; Chirp z-transform (CZT); M-ary quadrature amplitude modulation (M-QAM); coherent detection; fast Fourier transform (FFT); frequency offset (FO);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2188387

Filename

6153345