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In massive MIMO transmission, implicit beam forming was studied to eliminate channel state information (CSI) feedback. However, it is essential to introduce the calibration circuit which compensates the difference of complex amplitudes between the transmitters and receivers. This paper presents the effectiveness of calibration circuit for massive MIMO transmission by the testbed which implements the...
A folded dipole is known as a classical wideband antenna and usually analyzed by decomposing into two coupling modes: dipole mode and twin-lead stub mode, which can be seen as an effective 2-pole filter. A wideband microwave absorber surface can be formed by an array of receiving folded dipoles backed by a ground at λ/4, since the combination of the twin modes of folded dipole and the third coupling...
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