A Design Method of Spatial and Temporal Echo Cannceler Using Correlation Algorithm

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In the digital communication systems, the communication channels are often impaired by the nonlinear intersymbol interference that often arises at high transmission rate. Also, the echo canceling systems for hand-free set mobile radio telephone or tele-conferecing system are impaired by the nonlinear speaker characteristics.In order to overcome the above-mentioned problem, the Volterra system presented by the Volterra series expansion that is wett known as a generalization of the Taylor series model is often used. Also, in order to reduce computational load, we use array antenna technique.In this project, we designed nonlinear equalizer and echo canceler based on Volterra model and array antenna technique, and the validity of the proposed algorithms was demonstrated by using computer simulations. Next, we constructed blind spatial and temporal echo canceler and equalizer in order to consider practical situations that the input signals are unavailable. These algorithms were designed based on hybrid simplex genetic algorithm which solves the optimization problem by incorporating the simplex operator with GA , and the validity of the proposed algorithms was demonstrated by using computer simulations.