Adaptive array antenna for mobile communication
Isamu Chiba, Rumiko Yonezawa, Kazunari Kihira · 2002
Digital beamforming (DBF) antennas are developing as advanced phased array antennas. The microwave signal received at each element antenna of the DBF array antenna is converted to a digital signal after downconversion. Beamforming is carried out in a digital processor, so both excitation amplitudes and phases can be controlled more precisely in the DBF than in the conventional phased array antenna. The DBF also has the advantage of adaptive array antenna signal processing. This allows the nulls of an antenna radiation pattern to be steered in the directions of interference signals. Adaptive array antennas are applied to the base station antennas of mobile communications. In this presentation, in TDMA and CDMA communication systems, the adaptive array antenna fit to each system is shown.