LMS AND RLS ALGORITHMS FOR SMART ANTENNAS IN A W-CDMA MOBILE COMMUNICATION ENVIRONMENT

Abstract

Wireless mobile communication systems will be more sophisticated and wide spread in future. This growth demands not only for capacity but also high quality of service and better coverage without increase in radio frequency spectrum allocated for mobile applications. Wireless systems used fixed antenna systems in the past, but space division multiple access systems use smart antennas. These smart antennas dynamically adapt to changing traffic requirements. Smart antennas are usually employed at the base station and radiate narrow beams to serve different users. The complex weight computations based on different criteria are incorporated in the signal processor in the form of software algorithms. This article focuses on adaptive beam forming approach based on smart antennas and adaptive algorithms used to compute the complex weights like Least Mean Square (LMS) and Recursive Least Squares (RLS) algorithms.