US 12,261,686 B2
Control apparatus, OAM mode-multiplexing transmitting apparatus, OAM mode-multiplexing receiving apparatus, control method, and non-transitory computer readable medium
Eisaku Sasaki, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Mar. 2, 2023, as Appl. No. 18/116,722.
Claims priority of application No. PCT/JP2022/009194 (WO), filed on Mar. 3, 2022; and application No. 2022-145416 (JP), filed on Sep. 13, 2022.
Prior Publication US 2023/0318732 A1, Oct. 5, 2023
Int. Cl. H04J 14/04 (2006.01); H04B 7/185 (2006.01)
CPC H04J 14/04 (2013.01) [H04B 7/185 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A control apparatus configured to control an OAM (Orbital Angular Momentum) mode-multiplexing transmitting apparatus configured to communicate with an OAM mode-multiplexing receiving apparatus, wherein
the OAM mode-multiplexing transmitting apparatus comprises:
a transmitting-side UCA (Uniform Circular Array) including a plurality of transmitting antenna elements arranged in a rotational-symmetrical manner and at equal distances from a center of the rotational symmetry, where the number N of transmitting antenna elements is equal to or greater than four;
a fixed-weight OAM transmission processing unit configured to form a plurality of OAM (Orbital Angular Momentum) mode-multiplexing signals each of which is transmitted from a respective one of the plurality of transmitting antenna elements, where the number of OAM mode-multiplexing signals is equal to or less than N; and
a phase adjustment unit configured to adjust phases of the plurality of OAM mode-multiplexing signals, the phase adjustment unit being disposed between the plurality of transmitting antenna elements and the OAM transmission processing unit, and
the control apparatus comprises:
at least one memory storing instructions, and
at least one processor configured to execute, according to the instructions, a process comprising:
acquiring a pair of a value of first phase shifter phase information and a value of second phase shifter phase information from the OAM mode-multiplexing receiving apparatus;
first calculating the value of the first phase shifter phase information for each of the transmitting antenna elements from the acquired value of the first phase shifter phase information, and second calculating the value of the second phase shifter phase information for each of the transmitting antenna elements from the acquired value of the second phase shifter phase information; and
adding, for each of the transmitting antenna elements, the value of the first phase shifter phase information and the value of the second phase shifter phase information, and thereby third calculating, for each of the transmitting antenna elements, a phase shift value used for a phase adjustment of an OAM mode-multiplexing signal corresponding to the transmitting antenna element, and
the pair of the value of the first phase shifter phase information and the value of the second phase shifter phase information is calculated, in the OAM mode-multiplexing receiving apparatus, based on information corresponding to a transmitting-side axis misalignment, the information corresponding to the transmitting-side axis misalignment being a deviation of an array plane of the transmitting-side UCA from a reference plane of the transmitting-side UCA.