Receiver channel equalization for adaptive antennas: experimental results

The authors describe two complementary approaches for attacking the channel equalization problem within the framework of a primarily digital sidelobe canceling system. The first relies heavily on digital filtering techniques, while the second extends the SMI (sample matrix inversion) method into the realm of analog adaptive cancellation. The latter approach eases some of the digital signal processing requirements imposed by the former, although not without increasing the complexity of the receiver. In demanding applications, further improvements may be realizable by combining the two basic approaches in a tandem architecture. The experimental system was designed and built with the capability to test all three methods. Its modes of operation are depicted in simplified block diagram form and are explained. Empirical results from bench tests conducted with the experimental receiver demonstrate that the proposed methods can substantially improve cancellation performance.<>