Patent ID: 8315200

Claim:
A communication system comprising: a transmission device configured to transmit predetermined information; and a reception device configured to receive said predetermined information; wherein said transmission device includes encoding means configured to encode said predetermined information to obtain encoded information having following characteristics: if, during transmission of said encoded information, a signal-to-noise ratio is greater than a first predetermined signal-to-noise ratio, an error rate of said encoded information is at or below a predetermined value, and if, during transmission of said encoded information, said signal-to-noise ratio is smaller than a second predetermined signal-to-noise ratio, said error rate of said encoded information becomes a value of one half (½), wherein said error rate is a ratio of the number of erroneous units of data to the total number of units of data transmitted, and wherein said second predetermined signal-to-noise ratio is smaller than said first predetermined signal-to-noise ratio; and wherein said reception device includes interference signal generating means configured to generate an interference signal to be superimposed on said encoded information being transmitted, said interference signal reducing said signal-to-noise ratio to be smaller than said second predetermined signal-to-noise ratio to cause said error rate of said encoded information to become a value of one half (½); and decoding means configured to decode said encoded information to obtain said predetermined information.