Smart antenna system for wideband CDMA signals

Smart antennas have been successfully implemented in CDMA cellular communication systems in order to increase the system capacity and improve its performance. However, it has been shown by Hefnawi and Delisle (see IEEE International Conference on Personal Wireless Communications, p.5-8, December 2000) that the use of wideband CDMA signals results in a significant deterioration of the narrowband system performance. The use of adaptive array to reject wideband interferences and track wideband signals have been proven to be more efficient if frequency compensation is used. This paper presents an extension of the interpolated constant modulus algorithm (ICMA) introduced by Hefnawi and Delisle (see IEEE Antennas and Propagation Society International Symposium, vol.3, p.1588-1591, July 1999) to wideband CDMA signals (WCDMA). Simulation results show that the ICMA yields significantly better performance as compared to the conventional narrow-band adaptive algorithm.