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Bell Labs built a giant antenna in Holmdel, New Jersey, in 1960. It was part of a very early satellite transmission system called Echo. By collecting and amplifying weak radio signals bounced off ...

Abstract: This paper discusses the fundamental principles of a cognitive-radio RF system. The key points required to achieve a true cognitive-radio device are outlined. The operation of a ...

Abstract: We investigate spectrum sensing in cognitive radios with large antenna arrays. Gigantic MIMO and extra-large array antennas are fundamental technologies in 5G and future 6G networks, as well ...