Mobile Communication Inter-Symbol Crosstalk Cancellation Based on Calman Digital Equalizer Filter

In the digital mobile communication signal transmission system, the inter-symbol interference is one of the main factors affecting the performance. In order to make the error rate reducing to a minimum, this paper designs a new Calman digital equalization filter. It is based on Calman filter principle, and establishes the control mathematical model of observation equation and state equation, and uses MATLAB programming to realize the algorithm. In order to verify the effectiveness and reliability of this filter, this paper uses filter toolbox of MATAB to do numerical simulation on the filtering effect. Through comparing with normal digital equalization filter effect, after adding the Calman digital equalizer filter, the feedback signal is conformed to the reference signal. The duty ratio of SPWM follows the basic changing law, so as to maximize the elimination of crosstalk inter-symbol. It provides reference data for the research on mobile communication inter-symbol interference.