Multisymbol QPSK Partitioning for Improved Frequency Offset Estimation of 16-QAM Signals

被引：6

作者：

Li, Ming ^{[1
]}

Zhao, Jian ^{[2
]}

Chen, Lian-Kuan ^{[3
]}

机构：

[1] Chinese Univ Hong Kong, Inst Network Coding, Hong Kong, Hong Kong, Peoples R China

[2] Natl Univ Ireland Univ Coll Cork, Tyndall Natl Inst, Cork, Ireland

[3] Chinese Univ Hong Kong, Dept Informat Engn, Hong Kong, Hong Kong, Peoples R China

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2015年 / 27卷 / 01期

基金：

爱尔兰科学基金会;

关键词：

Carrier frequency offset estimation; coherent optical fiber communication; least-squares methods; quadrature amplitude modulation; DISPERSION COMPENSATION; SYSTEMS;

D O I：

10.1109/LPT.2014.2359735

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：

We propose and investigate a generalized quadrature phase-shift keying (QPSK) partitioning algorithm for carrier frequency offset (CFO) estimation in coherent optical 16-quadrature amplitude modulation (QAM) receivers. The algorithm utilizes the phase difference between the samples with different time-domain separations, so that the estimation accuracy can be significantly enhanced. We propose a computationally efficient procedure to implement the generalized CFO estimation algorithm. In a 28-GBd coherent 16-QAM system, simulation results and complexity analysis show that the time span of 16 can realize an optimal balance between performance and complexity. With the optimal time span, the complexity to achieve a normalized variance of 10(-8) for the CFO estimation error can be reduced by 150 times compared with the conventional QPSK partitioning algorithm.

引用

页码：18 / 21

页数：4

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