A New Carrier Recovery Loop for High-Order Quadrature Amplitude Modulation

Yuan OUYANG
Chin-Liang WANG

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.11    pp.4250-4258
Publication Date: 2005/11/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.11.4250
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
blind synchronization,  carrier recovery,  frequency synchronization,  frequency offset estimation,  quadrature amplitude modulation (QAM),  

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Summary: 
In this paper, we present a new all-digital carrier recovery loop for high-order quadrature amplitude modulation (QAM) signal constellations. The proposed approach is a blind phase-frequency detector structure that consists of a phase detector, a phase offset estimator, a frequency offset estimator, and a digital control oscillator. Compared to previous related approaches, the proposed algorithm provides a wider acquisition range and a more accurate estimation of frequency and phase offsets. These features are demonstrated by simulation results of the DOCSIS (Data-Over-Cable Service Interface Specifications) cable modem system.