Communication Signal Carrier Frequency Deviation Precision Estimates

This paper deals with problems of high accurate estimation of carrier frequency offset which is widely used in communication signals synchronization and frequency measurement. Therefore, it'is very importance for interception and location of signals.In this paper, a variety of familiar signals and channels are firstly analyzed and then the methods of DFT and cyclic correlation are introduced. DFT method can be fast implemented on DSP platform by the use of FFT algorithm, while the method of cyclic correlation has better noise immunity performance and high estimation accuracy. The problems of carrier frequency offset estimation under the condition of the AGWN channel, frequency flat-fading channel and frequency selective-fading channel are studied in detail respectively. And the corresponding improved algorithms for the above discussed methods are also provided. Finally, a new combined method with better estimation accuracy and extended estimation range is also presented. Simulation results show the method is feasible.