Adaptive equalizer with the clock recovery for QAM demodulation.

A new clock synchronization recovery algorithm based on an adaptive equalizer is presented. The conducted research refers to the direction of receiving devices development for communication systems, using PSK/QAM signal modulation in their channels. The obtained results can be used in the development of demodulation schemes for satellite, radio relay and optical communication systems. The developed adaptive clock recovery (ACR) algorithm, as a modification of the adaptive equalizer, is presented for the "blind" equalization option in the continuous signal processing scheme. However, this algorithm can also be effectively used in demodulation schemes for block-continuous signals with the equalizer coefficients adjustment using unique words and pilot symbols. In comparison with classical clock synchronization schemes, the presented algorithm has a lower computational complexity and effectively operates at an input sampling rate of 2 samples per modulation symbol without reducing noise immunity. Based on the presented algorithm, it is possible to develop demodulation schemes operating at an input sampling rate of 1.5 or 1 sample per modulation symbol. [ABSTRACT FROM AUTHOR]

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