ANTENNA SYSTEM FOR CDMA BASE STATION AND METHOD FOR INCREASING GAIN OF THE CDMA ANTENNA SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an antenna system by which supply of a prescribed energy stream to each of pluralities of rake fingers in the code division multiple access CDMA system is compensated. SOLUTION: A CDMA base station 60 by this invention compensates a prescribed energy stream supplied to each of pluralities of rake fingers 110, 112,... and improves the gain. One side face of the base station includes pluralities of pairs of diversity antennas 62, 64,.... The energy from a 1st antenna of each pair is delayed and the energy from a 2nd antenna of each pair is not delayed. The added delay is larger than a tip time of the rake fingers. Signals from the antenna pairs are synthesized and converted into a digital form. The energy from all antennas is selected by each rake finger and the energy from each antenna is selected by any of the rake fingers. Then the energy from the rake fingers is synthesized into a single data stream.