Patent ID: 7697848

Claim:
A wireless communication system comprising a wireless transmitting apparatus and a wireless receiving apparatus, wherein the wireless transmitting apparatus includes a polarization plane limiting part transmitting only light of a specific polarization plane a reflection medium reflecting the light transmitted through the polarization plane limiting part, and a polarization plane changing part changing an angle of a polarization plane of the light, again transmitted through the polarization plane limiting part, among the light reflected at the reflection medium, and the wireless receiving apparatus includes a detecting part detecting the light of the specific polarization planes from the wireless transmitting apparatus and an information extracting part generating a signal in accordance with the change of angle of a polarization plane of the light based on the detection of the light of the specific polarization planes at the detecting part and extracting the information transmitted from the wireless transmitting apparatus based on the signal, wherein the polarization plane limiting part is constituted by a polarization plate or a polarization filter, and the polarization plane changing part includes a liquid crystal device transmitting the light of the specific polarization planes from the polarization plane limiting part and a control device controlling the liquid crystal device so that an angle of a polarization plane of the light of the specific polarization planes can be changed in accordance with the transmitted information.