Title :
A Carrier Recovery Algorithm for High Order QAM Signals
Author :
Xue Wei ; Yang Xiaoniu ; Zhang Zhaoyang
Author_Institution :
Nat. Lab. of Inf. Control Technol. for Commun. Syst., Jiaxing, China
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.
Keywords :
demodulation; quadrature amplitude modulation; blind carrier recovery; carrier recovery algorithm; decision directed mode; demodulation; high order QAM signals; multithreshold polarity decision mode; numerically controlled oscillator; steady state error; Constellation diagram; Detectors; Phase locked loops; Quadrature amplitude modulation; Signal processing algorithms; Simulation; Steady-state;
Conference_Titel :
Wireless Communications Networking and Mobile Computing (WiCOM), 2010 6th International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-3708-5
Electronic_ISBN :
978-1-4244-3709-2
DOI :
10.1109/WICOM.2010.5600968
