Blind carrier recovery for circular QAM using nonlinear least-squares estimation

被引：1
|
作者：
Duryea, Timothy [1 ]
Sari, Ilkay [1 ]
Serpedin, Erchin [1 ]
机构：
[1] Texas A&M Univ, Dept Elect Engn, College Stn, TX 77843 USA
来源：
DIGITAL SIGNAL PROCESSING | 2006年 / 16卷 / 04期
基金：
美国国家科学基金会;
关键词：
carrier synchronization; circular QAM; frequency offset; carrier phase; nonlinear least-squares estimator; blind synchronization;
D O I：
10.1016/j.dsp.2006.03.001
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：
In this work, a family of blind feedforward nonlinear least-squares (NLS) estimators for joint estimation of the carrier phase and frequency offset of circular quadrature amplitude modulated (QAM) transmissions is introduced. Well-known synchronization techniques are adapted for the circular QAM schemes, and a constellation-dependent optimal matched nonlinear estimator is derived to minimize the asymptotic variance. A computationally efficient approximation to the optimal nonlinearity is introduced and its performance assessed. Finally, computer simulations for various circular QAM transmissions are carried out to show that the proposed estimation technique is competitive with conventional monomial estimators. From the simulation results, conclusions are drawn about selecting the best synchronization method for implementation in actual communication systems. (C) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码：358 / 368
页数：11
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