Wireless station, interference avoidance method, and system for interference avoidance

A method of avoiding an interference between a first communication system and a second communication system, with at least a portion of a first frequency band used in the first communication system and a portion of a second frequency band used in the second communication system being shared or neighboring, the method comprising:

• extracting a waveform characteristic quantity, the waveform characteristic quantity expressed by a second order cyclic autocorrelation function, the waveform characteristic quantity showing a statistical characteristic of an orthogonal frequency division multiplexing (OFDM) signal received from the first communication system;
• determining communication parameters to be used for communication of the wireless station in the second communication system depending on a determination result of whether the extracted waveform characteristic quantity is of a predetermined waveform characteristic quantity for reducing an interference;
• and
• transmitting and receiving a wireless communication signal in the second communication system in accordance with the determined communication parameters, wherein
• first predetermined subcarriers of a first signal received from the first communication system at a specific time and second predetermined subcarriers of a second signal received from the first communication system at another specific time include identical data signals.

A system comprising at least a first communication system and a second communication system, with at least a portion of a first frequency band used in the first communication system and a portion of a second frequency band used in the second communication system being shared or neighboring, wherein

• a first wireless station in the first communication system includes first circuitry configured to
• monitor a reception level of a desired signal used for communication with a first destination;
• generate an orthogonal frequency division multiplexing (OFDM) signal including a predetermined waveform characteristic quantity expressed by a second order cyclic autocorrelation function for reducing an interference when the reception level is lower than a predetermined value;
• and
• transmit the transmission signal;
• and
• a second wireless station in the second communication system includes second circuitry configured to
• extract the waveform characteristic quantity of the OFDM signal received from the first wireless station;
• determine communication parameters to be used for communication of the second wireless station in the second communication system depending on a determination result of whether the extracted waveform characteristic quantity is of the predetermined waveform characteristic quantity for reducing the interference;
• and
• transmit and receive a wireless communication signal in the second communication system in accordance with the determined communication parameters, wherein
• first predetermined subcarriers of a first signal received from the first communication system at a specific time and second predetermined subcarriers of a second signal received from the first communication system at another specific time include identical data signals.