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Blind carrier frequency offset estimation for QAM signals based on weighted 4th power of signal samples

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2 Author(s)
Sergienko, A.B. ; Dept. of Theor. Fundamentals of Radio Eng., St. Petersburg Electrotech. Univ., St. Petersburg, Russia ; Petrov, A.V.

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.

Published in:

Design & Test Symposium (EWDTS), 2010 East-West

Date of Conference:

17-20 Sept. 2010

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