SMART ANTENNAS ENHANCE CELLULAR PCS PERFORMANCE/

WIRELESS systems such as cellular, personal communications services (P CS), and personal communications networks (PCN) must provide a combina tion of coverage, capacity, and service quality. In addition, governme nt regulations may impose other requirements such as position location for emergency ''911'' service. Unfortunately, conventional static wir eless infrastructures often cannot satisfy dynamic network needs nor p rovide special services such as position location. Smart-antenna syste ms, however, offer a cost-effective approach for improving performance in a controllable dynamic system. This first article in a two-part se ries overviews the structure and implementation of these systems.