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

被引：18
|
作者：
Leng, Haijun [1 ]
Yu, Song [1 ]
Li, Xin [1 ]
Lan, Mingying [1 ]
Liao, Ping [1 ]
Wang, Tianyi [1 ]
Gu, Wanyi [1 ]
机构：
[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2012年 / 24卷 / 09期
关键词：
Chirp z-transform (CZT); coherent detection; fast Fourier transform (FFT); frequency offset (FO); M-ary quadrature amplitude modulation (M-QAM); ALGORITHM;
D O I：
10.1109/LPT.2012.2188387
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：787 / 789
页数：3
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