Patent ID: 7089038

Claim:
A data communication system for performing bi-directional communication between a first communication equipment and a second communication equipment, the data communication system comprising: a first transmitter forming part of the first communication equipment for transmitting a first signal to the second communication equipment; a first receiver forming part of the first communication equipment for receiving a second signal from the second communication equipment indicating whether or not the second communication equipment received the first signal or indicating a condition in which the second communicating equipment received the first signal; a first controller forming part of the first communication equipment for controlling the first transmitter to reduce its transmitting power either until the second signal received by the first receiver indicates that the condition of the reception of the first signal received by the second communication equipment is poor or until the first receiver does not receive any signal from the second communication equipment; a second receiver forming part of the second communication equipment for receiving the first signal transmitted by the first transmitter; a second controller forming part of the second communication equipment for generating the second signal in accordance with the first signal received by the second receiver; and a second transmitter forming part of the second communication equipment for transmitting the second signal to the first receiver; wherein the first communication equipment has a first directional antenna, the first controller electrically adjusting a transmitting direction of the first directional antenna in accordance with a maximum receiving signal strength of the first receiver by changing a phase of the first directional antenna at a reception point thereof; and wherein the second communication equipment has a second directional antenna, the second controller electrically adjusting a transmitting direction of the second directional antenna in accordance with a maximum receiving signal strength of the second receiver by changing a phase of the second directional antenna at a reception point thereof.