Abstract :
In this article we discuss current and future antenna technology for wireless systems and the improvement that smart and adaptive antenna arrays can provide. We describe standard cellular antennas, smart antennas using fixed beams, and adaptive antennas for base stations, as well as antenna technologies for handsets. We show the potential improvement that these antennas can provide, including range extension, multipath diversity, interference suppression, capacity increase, and data rate increase. The issues involved in incorporating these antennas into wireless systems using CDMA, GSM, and IS-136 in different environments, such as rural, suburban, and urban areas, as well as indoors, are described. Theoretical, computer simulation, experimental, and field trial results are also discussed that demonstrate the potential of this technology
Keywords :
adaptive antenna arrays; cellular radio; code division multiple access; digital radio; diversity reception; indoor radio; interference suppression; mobile antennas; multipath channels; radiofrequency interference; CDMA; GSM; IS-136; adaptive antenna arrays; base stations; capacity increase; cellular antennas; data rate increase; fixed beams; handsets; indoor; interference suppression; multipath diversity; range extension; rural area; smart antennas; suburban area; urban area; wireless systems; Antenna arrays; Bit error rate; Fading; Frequency conversion; Interchannel interference; Multiaccess communication; Polarization; Propagation delay; Receiving antennas; Time division multiple access;
