Wireless communication system

A wireless communication system, comprising:

• a control apparatus;
• at least one relay apparatus connected with said control apparatus via an optical transmission path;
• and
• a plurality of wireless communication terminals communicating wirelessly with said at least one relay apparatus, wherein:
• said control apparatus comprises:
• a first optical transmitting section for converting a downstream electric signal into a downstream optical signal and transmitting the downstream optical signal to said at least one relay apparatus via the optical transmission path;
• and
• a first optical receiving section for converting an upstream optical signal transmitted from said at least one relay apparatus via the optical transmission path into an upstream electric signal,
• said at least one relay apparatus comprises:
• a second optical receiving section for converting the downstream optical signal transmitted from said control apparatus via the optical transmission path into the downstream electric signal;
• a level control section for attenuating a level of the downstream electric signal so as to narrow a communicable area of said at least one relay apparatus and to allow a level of a wireless signal transmitted by one of said wireless communication terminals existing in the communicable area to be within a predetermined range;
• wherein when said wireless communication terminals use a respective channel, the predetermined range is smaller than a difference between (a) a leakage ratio which is a ratio of a level of a wireless signal using the respective channel with respect to a level of a frequency component leaking to another channel different from the respective channel, and (b) a signal to noise ratio which is a ratio of a level of a leakage signal from a wireless communication terminal using another channel different from the respective channel with respect to the level of the wireless signal using the respective channel;
• a transmitting/receiving antenna section for transmitting the downstream electric signal converted by said second optical receiving section to said one wireless communication terminal as a wireless signal, and receiving a wireless signal transmitted from said one wireless communication terminal as the upstream electric signal;
• and
• a second optical transmitting section for converting the upstream electric signal received by said transmitting/receiving antenna section into the upstream optical signal and transmitting the upstream optical signal to said control apparatus via the optical transmission path.