DocumentCode :
2835813
Title :
Blind carrier frequency offset estimation for QAM signals based on weighted 4th power of signal samples
Author :
Sergienko, Alexander B. ; Petrov, Alexander V.
Author_Institution :
Dept. of Theor. Fundamentals of Radio Eng., St. Petersburg Electrotech. Univ., St. Petersburg, Russia
fYear :
2010
fDate :
17-20 Sept. 2010
Firstpage :
278
Lastpage :
281
Abstract :
The method is presented for blind frequency offset estimation for signals with quadrature amplitude modulation (QAM). The method is based on a circular harmonic expansion of log-likelihood function (LLF). By retaining only the most significant term in this series a radius-weighted version of popular 4th power frequency estimation algorithm is obtained. This approach leads to notable improvement of the estimation quality. Computer simulation was performed with 16-QAM and 32-QAM signals, the results justified the advantages of the suggested method. It was also shown that using fixed (SNR-independent) weighting functions does not lead to any notable performance loss.
Keywords :
frequency estimation; quadrature amplitude modulation; signal processing; 16-QAM signals; 32-QAM signals; blind carrier frequency offset estimation; circular harmonic expansion; computer simulation; fixed weighting functions; log-likelihood function; quadrature amplitude modulation; radius-weighted 4th power frequency estimation algorithm; Frequency estimation; Frequency modulation; Harmonic analysis; Maximum likelihood estimation; Quadrature amplitude modulation; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Design & Test Symposium (EWDTS), 2010 East-West
Conference_Location :
St. Petersburg
Print_ISBN :
978-1-4244-9555-9
Type :
conf
DOI :
10.1109/EWDTS.2010.5742136
Filename :
5742136
Link To Document :
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