Time dependent adaptive arrays

Abstract

A time dependent adaptive array (TDAA) is a combination of the time dependent optimal filter (or FRESH filter) and an adaptive array. A TDAA exploits spatial, frequency, and time diversities. The idea behind the TDAA is that additional sources of correlated data can be obtained from each spatially separated array element through frequency shifting the data at each antenna element. For some signal types, the TDAA can be blindly adapted by configuring the TDAA as a spectral correlation predictor. The performance of the TDAA configured as a spectral correlation predictor is compared with the least-squares CMA array (LSCMA), the least-squares SCORE (LSSCORE) array, the conventional array with a training signal, the TDAA with a training signal, and a no-diversity system. The test signals used are advanced mobile phone service (AMPS) signals.