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In this letter, we experimentally validate an interference reduction technique that combines a digital subtraction technique, and eigenbeam-forming with an end-fire arrangement of linear array antennas. The eigen-beamforming significantly reduces the self-interference at the cost of a slight drop in the degrees-of-freedom of the antenna. We experimentally evaluate the degree of interference reduction using two linear sleeve-dipole arrays in end-fire arrangement. This experiment uses MIMO (Multiple-Input Multiple-Output)-OFDM (Orthogonal Frequency Division Multiplexing) signals to evaluate the realistic performance of this technique. The results of the experiment show the combination of eigen-beamforming and digital subtraction can significantly reduce, −76 dB, the interference.

Experimental evaluation of interference reduction effect; Eigen-beamforming and digital subtraction by using MIMO-OFDM signals