Patent ID: 6107963
Filing Date: 2000-08-22
Classification: H01Q

Abstract:
An adaptive array antenna for varying directivity by weighting receive signals so as to remove an undesired signal from the receive signals, comprisinga plurality of array antenna elements for receiving signals;a weighting control part for receiving the signals from said plurality of array antenna elements, and calculating weight information including a plurality of element weights for use in weighting the receive signals so as to remove the undesired signal;a weighting part for receiving said weight information from said weighting control part, and weighting the signals from said plurality of array antenna elements; anda summer for combining all signals from said weighting part;said weighting control part comprising:a buffer for storing sample data obtained by sampling the signals from said plurality of array antenna elements;an evaluation part for performing array combining operation by multiplying said sample data by each of a plurality of possible weight information for each component corresponding to each of said array antenna elements and combining multiplication results, and for calculating an evaluation value representing a degree of removal of the undesired signal by the possible weight information from each of combined results;a selection part for selecting some of the plurality pieces of possible weight information in order of decreasing degree of evaluation;an exchanging part for exchanging one or more element weights included the selected plurality pieces of possible weight information to generate new possible weight information;a changing part for changing one or more element weights included in the selected plurality pieces of possible weight information with a random number to generate new possible weight information;a reproduction part for copying the selected weight information to generate new possible weight information;an information storage part for storing the possible weight information generated by said exchanging part, said changing part, and said reproduction part, and supplying the possible weight information to said evaluation part; anda determination part for calculating said weight information from the possible weight information with a most effective evaluation value among the selected possible weight information; whereinof said plurality pieces of possible weight information, only the plurality pieces of possible weight information with which the undesired signal can be removed more effectively are selected, exchanged, changed, reproduced, and reevaluated repeatedly for a predetermined number of times so as to be renewed from an initial state, and then only the possible weight information with which the undesired signal can be removed most effectively is determined as said weight information by said determination part.