Conference Proceeding

A Carrier Recovery Algorithm for High Order QAM Signals

10/2010; DOI:10.1109/WICOM.2010.5600968 pp.1 - 4 In proceeding of: Wireless Communications Networking and Mobile Computing (WiCOM), 2010 6th International Conference on
Source: IEEE Xplore

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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Keywords

blind carrier recovery
 
carrier recovery
 
carrier recovery algorithm
 
key technique
 
multi-threshold polarity decision mode
 
order quadrature amplitude modulation
 
oscillator
 
proper time
 
simulation results
 
standard deviation
 
switches
 
yield lower steady state error