2010•Unpublished venueRequires access

A Carrier Recovery Algorithm for High Order QAM Signals

Wei Xue, Xiaoniu Yang, Wei Xue, Zhaoyang Zhang

Abstract

The carrier recovery is one key technique in the demodulation of high order quadrature amplitude modulation (QAM) signals. A carrier recovery algorithm which switches between multi-threshold polarity decision mode and decision directed mode according to the standard deviation of the frequency of numerically controlled oscillator (NCO) is proposed. The proposed algorithm can detect a proper time for the mode switch to yield lower steady state error. The simulation results demonstrate the effectiveness of the proposed algorithm in improving the performance of blind carrier recovery.

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Available abstract

Key concepts: Carrier recovery, Demodulation, Quadrature amplitude modulation, QAM, Computer science, Algorithm, Amplitude modulation, Modulation (music)