Patent ID: 11888521
Assignee: PANASONIC HOLDINGS CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A wireless communication system comprising:
a master station device including
a processor which, in operation, outputs a subcarrier modulation signal, and
a transmitter which, in operation, maps an in-phase (I) component and a quadrature-phase (Q) component of the subcarrier modulation signal to an optical signal to be transmitted to a fronthaul, wherein:
the subcarrier modulation signal is coded in a first quadrature amplitude modulation scheme having a plurality of signal points,
the optical signal is coded in a second quadrature amplitude modulation scheme having a plurality of candidate signal points, the second quadrature amplitude modulation scheme having a higher modulation multilevel number than the first quadrature amplitude modulation scheme, and
the transmitter sets each of the plurality of signal points of the subcarrier modulation signal to a corresponding candidate signal point of the plurality of candidate signal points of the optical signal, a distance from the each of the signal points of the subcarrier modulation signal to the corresponding candidate signal point being a shortest distance in an IQ plane of the optical signal; and

a slave station device including
a receiver which, in operation, receives the optical signal via the fronthaul, and
a processor which, in operation, identifies the subcarrier modulation signal based on the I component and the Q component of the subcarrier modulation signal mapped to the optical signal.