US 9,813,134 B1
Base station and antenna calibration method
Junya Morita, Yokohama (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki-shi, Kanagawa (JP)
Filed on Jun. 6, 2017, as Appl. No. 15/615,162.
Claims priority of application No. 2016-150698 (JP), filed on Jul. 29, 2016.
Int. Cl. H03M 3/00 (2006.01); H04B 7/06 (2006.01); H04L 25/02 (2006.01); H04W 16/28 (2009.01); H04W 36/00 (2009.01); H04W 36/30 (2009.01)
CPC H04B 7/0626 (2013.01) [H04B 7/0628 (2013.01); H04B 7/0632 (2013.01); H04L 25/0204 (2013.01); H04W 16/28 (2013.01); H04W 36/0005 (2013.01); H04W 36/30 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A base station comprising a plurality of antennas and a plurality of analog circuits that are provided for the antennas, respectively, the base station comprising:
a first converter that converts, with respect to each of the analog circuits, a signal in a time domain that is obtained after a given signal passes through the analog circuit into a first signal in a frequency domain;
a second converter that converts the signal in the time domain into a second signal in the frequency domain;
a first calculator that calculates, with respect to each of the analog circuits, an inverse characteristic of a phase characteristic in the frequency domain based on the first signal and the second signal;
a second calculator that calculates, with respect to each of the analog circuits, a tap coefficient of a filter based on the inverse characteristic of the phase characteristic; and
a finite impulse response (FIR) filter that filters, with respect to each of the analog circuits, the given signal that is input to the analog circuit based on the tap coefficient that is calculated by the second calculator.