Patent ID: 7937041

Claim:
A shared frequency transmitter for use in a network environment where transmitters and receivers of plural radio communication systems in which the same frequency is used exist, comprising: a communicating unit configured to detect peripheral transmitters existing in a peripheral area, and to exchange information with the detected peripheral transmitters in advance regardless of whether interference is detected; and a signal generating unit configured to generate a transmit signal by applying an interference cancellation technique, which does not include a time division technique and depends on the information obtained through the exchange of information, wherein the communicating unit is configured to transmit a search signal to the peripheral transmitters, and if the communicating unit receives an acknowledgement signal which is a response to the search signal from the peripheral transmitters, the communicating unit transmits information including a pilot symbol to the peripheral transmitters, receives information including pilot signals from the peripheral transmitters, and passes the received information to the signal generating unit for use in the interference cancelation technique.