Abstract: A variable step size least mean square algorithm in smart antennas is presented in this paper. The algorithm is established by introducing a hyperbolic tangent function relation between step size and signal error. The contradiction between the convergence speed and maladjustment error is thus solved. The simulationresults show that the proposed algorithm has faster convergence and smaller maladjustment than standard least mean square algorithm.

Key words: smart antenna, least mean square algorithm, variable step size, hyperbolic tangent function