Beam space constant modulus algorithm adaptive array antennas

Abstract

A constant modulus algorithm (CMA) adaptive array antenna is based on the fact that interference causes a constant modulus signal to undergo amplitude fluctuations. The authors proposed a beam space CMA (BSCMA) adaptive array antenna. In the BSCMA adaptive array, first, multiple beams are formed in the multibeam former. Next, those beams whose received signals have sufficient level are selected. The weights of only these selected beams are optimized in an adaptive loop. The BSCMA adaptive array antenna is useful in mobile satellite communications, because the number of interferences that need to be considered is smaller than the number of elements. >