Patent ID: 11936429
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A wireless reception system comprising:
a base station reception unit; and
an accommodation station reception unit, wherein
the base station reception unit includes:
a plurality of reception antennas configured to form a plurality of reception beams using an arriving RF signal and receive the plurality of formed reception beams;
a matrix operation unit including a plurality of first ports and a plurality of second ports, the matrix operation unit being configured to use each of the plurality of first ports as a reference port and perform, on a plurality of signals obtained by a plurality of reference ports, a BFN matrix operation of making a phase change that is different depending on a position of the reference port and cause phases of a plurality of signals output from the plurality of second ports to have a linear inclination, the plurality of second ports being connected to the plurality of reception antennas and receiving the RF signal received and output by the plurality of reception antennas using the plurality of reception beams;
a plurality of optical modulators, each of which is connected to each of the plurality of first ports of the matrix operation unit to provide light of different wavelengths to each of the plurality of first ports, the optical modulator being configured to modulate the provided light to generate an optical signal based on the RF signal obtained through an inverse operation of the BFN matrix operation and output from each the plurality of the first ports; and
an optical multiplexer configured to multiplex the plurality of optical signals generated by the plurality of optical modulators and output the plurality of multiplexed optical signals; and, the accommodation station reception unit is configured to receive the optical signal output by the base station reception unit, and includes:
an optical demultiplexer configured to receive the optical signal output by the optical multiplexer included in the base station reception unit and demultiplex the optical signal for a wavelength, and
an output unit configured to convert the optical signal demultiplexed by the optical demultiplexer into an electrical signal to demodulate the RF signal and output the demodulated RF signal.