Kalman Carrier Recovery Algorithm for High-Order QAM

Dah-Chung CHANG
Wei-Tsen LIN
Yung-Fang CHEN

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B    No.11    pp.3117-3119
Publication Date: 2006/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.11.3117
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
Kalman filter,  carrier synchronization,  QAM,  cable modem,  

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Summary: 
A new Kalman carrier synchronization algorithm is developed for high-order QAM transmission to reduce complexity compared to the conventional Kalman approach. The state model in the proposed algorithm employs only phase, instead of both phase and frequency, as in the conventional method. A reduced-observation model is also introduced to eliminate matrix operations in the Kalman recursions. Simulations results show that the one-state Kalman algorithm has better performance and lower complexity than the two-state Kalman algorithm. The cable modem downstream system is applied to demonstrate the effectiveness of the proposed algorithm.