SMART ANTENNAS .2. SMART ANTENNAS ENHANCE CELLULAR PCS PERFORMANCE/

CONTINUING growth of cellular and personal communications services (PC S) trill challenge system planners as they try to achieve a combinatio n of coverage, capacity, and service quality, While conventional stati c infrastructures often cannot fulfill dynamic network needs, the use of smart antennas in a controllable dynamic system provides a cost-eff ective method for improving system performance, This second article of a two-part series examines the use of diversity methods in these syst ems, along with strategies for conversion from analog cellular formats to digital schemes such as time-division multiple access (TDMA) and c ode-division multiple access (CDMA). in addition, various commercial a pplications of smart antennas are reviewed.