Patent ID: 6061020
Filing Date: 2000-05-09
Classification: H04B

Abstract:
A method of transmitting a digital signal from a transmitter and receiving the digital signal at a receiver, wherein at a transmitter end,a radio wave of a carrier signal is transmitted from two dipole antennas which are mutually crossed at right angles and are arranged in a plane perpendicular to a propagating direction of the radio wave under such a condition that a plane of polarization of the radio wave is rotated in accordance with the digital signal to be transmitted, andat a receiver end,the radio wave transmitted from said pair of dipole antennas is received by an antenna and the rotation of the plane of polarization of the received radio wave is detected to reproduce the digital signal; whereinthe plane of polarization of the transmitted radio wave is rotated at a first modulation frequency when the digital signal in a form of a bivalent signal is in a first state; andthe plane of polarization of the transmitted radio wave is rotated at a second modulation frequency which is different from said first modulation frequency when the digital signal is in a second state; andsaid first and second modulation frequencies being higher than fading frequency.