Adaptive array antenna combined with tapped delay line using processing gain for spread-spectrum CDMA systems

Abstract

The paper first proposes a method to correctly update the weights of an adaptive array antenna using the inherent processing gain of a spread spectrum (SS) receiver, even for received signals with very low desired-to-undesired signal power ratio (DUR). Since the method reduces effect of the delay in the controlling loop, stable convergence can be guaranteed in a fading channel. Secondly the method is applied to a tapped delay line (TDL) adaptive array antenna in order to improve performance of rejecting co-channel interference in CDMA. The array is investigated corresponding to the DUR and bandwidth of SS signals. >