Patent ID: 11929781
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A communication system in which a terminal device communicates with a base station by optical wireless communication and radio frequency (RF) wireless communication, wherein
the terminal device comprises
an illuminance sensor that receives an optical signal for the optical wireless communication from the base station;
an information acquisition unit that retrieves signal information containing n bits (where n is an integer equal to or greater than 2) included in the optical signal;
an array generation unit that generates n pieces of signal information by sequentially shifting each bit of the signal information one bit at a time;
a list in which ID information and authentication information for initiating the RF wireless communication are associated; and
an analysis unit that performs a brute-force calculation of a correlation coefficient between the n pieces of signal information generated by the array generation unit and the ID information in the list, and selects the ID information with the maximum correlation coefficient.