Patent ID: 8588325

Claim:
A communication system that communicates over frequency channels set by dividing a frequency bandwidth assigned to the system, the communication system comprising: a transmitting device that transmits a signal in which Inter-Channel Interference (ICI) is allowed by purposely overlapping among frequency channels adjacent to each other in a frequency domain; and a receiving device that receives the signal transmitted from the transmitting device; the transmitting device comprising: a spectrum usage information and policy information acquiring portion that detects a frequency channel that is not being currently used and determines usage status of the frequency channel; and a pulse shape and symbol rate controller that determines a pulse waveform of a signal to be transmitted from the transmitting device based upon information acquired by the spectrum usage information and policy information acquiring portion, and that determines a center carrier frequency and a symbol rate of the signal to be transmitted from the transmitting device based upon the pulse waveform determined; the receiving device comprising ICI removal means that removes the ICI generated in an overlapping frequency in the signal transmitted from the transmitting device; wherein the pulse shape and symbol rate controller determines whether or not it is possible to overlap the frequency channel that is not currently used with an adjacent frequency channel, and when it is determined that the receiving device comprises the ICI removal means that removes the ICI generated by overlapping the frequency channel, the pulse shape and symbol rate controller determines the pulse waveform of the signal to be transmitted from the transmitting device by overlapping the frequency channel that is not currently used with the adjacent frequency channel.