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2010•Communications technologyRequires access

A Modified Carrier Recovery Algorithm for QAM

Lidong Zhu

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Abstract

A new structure of carrier recovery loop for QAM systems is proposed in this paper.In this structure,frequency detection and phase detection are carried out simultaneously.Meanwhile,a modified weighting decision-directed(MWDD)algorithm is adopted in phase detection period.Simulation indicates that the algorithm could improve the capture speed of carrier recovery loop and reduce the frequency flicker.The 16-QAM circuit could capture up to 11% frequency offset of the symbol rate.

About this research paper

What this paper is about

A new structure of carrier recovery loop for QAM systems is proposed in this paper.In this structure,frequency detection and phase detection are carried out simultaneously.Meanwhile,a modified weighting decision-directed(MWDD)algorithm is adopted in phase detection period.Simulation indicates that the algorithm could improve the capture speed of carrier recovery loop and reduce the frequency flicker.The 16-QAM circuit could capture up to 11% frequency offset of the symbol rate.

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Available abstract

A new structure of carrier recovery loop for QAM systems is proposed in this paper.In this structure,frequency detection and phase detection are carried out simultaneously.Meanwhile,a modified weighting decision-directed(MWDD)algorithm is adopted in phase detection period.Simulation indicates that the algorithm could improve the capture speed of carrier recovery loop and reduce the frequency flicker.The 16-QAM circuit could capture up to 11% frequency offset of the symbol rate.

Key concepts: Computer science, Carrier recovery, QAM, Carrier frequency offset, Frequency offset, Weighting, Algorithm, Offset (computer science)

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