Wireless communication system and terminal-device authentication method in wireless communication system

A terminal-device authentication method in a wireless communication system including a plurality of terminal devices configured to establish wireless communication connection therebetween with authentication, the terminal-device authentication method comprising:

• transmitting, by each of the code transmitters, a time-varying code, the time-varying codes transmitted from the code transmitters being different from each other;
• receiving, by a plurality of code receivers connected to the terminal devices respectively, the time-varying codes transmitted from the code transmitters;
• generating, by each of the code receivers, fingerprint based on the received time-varying codes, the fingerprint being unique to a space where the time-varying codes are receivable;
• acquiring, by each of the terminal devices, the fingerprint from the code receiver connected thereto;
• transmitting, by each of the terminal devices, the fingerprint via wireless communication;
• receiving, by each of the terminal devices, the fingerprint via the wireless communication;
• and
• authenticating, as a communications partner of one of the terminal devices, another one of the terminal devices if the fingerprint received from the another one of the terminal devices matches the fingerprint acquired by the one of the terminal devices.