A wireless station in a second communication system, with at least a portion of a first frequency band used in a first communication system and a portion of a second frequency band used in the second communication system being shared or neighboring, the wireless station comprising: a waveform characteristic quantity extracting unit configured to extract a predetermined waveform characteristic quantity attached to an interference notification signal received in an orthogonal frequency division multiplexing, OFDM, communication system from an interfered wireless station of the first communication system, wherein the predetermined waveform characteristic quantity is expressed by a second order cyclic autocorrelation function, CAF, of the OFDM signal, wherein the wireless station is configured to determine whether the interference notification signal is received or not by determining whether the CAF has one or more peaks at a predetermined combination of a cyclic frequency and a lag parameter (α, v); a communication parameter determining unit configured to determine, in response to the waveform characteristic quantity extracting unit extracting the predetermined waveform characteristic quantity, changed communication parameters to be used for communication with a destination wireless station of the second communication system by the wireless station; and a transmission unit (82, 86) and a reception unit (82, 83) configured respectively to transmit and receive a wireless communication signal in the second communication system in accordance with the determined changed communication parameters; wherein the CAF is obtained by multiplying by a factor exp(j2πm 1 k) a k-th signal belonging to a first subcarrier group among a plurality of subcarriers included in the OFDM signal, and multiplying by a factor exp(j2πm 2 k) a k-th signal belonging to a second subcarrier group among the plurality of subcarriers included in the OFDM signal, and the wireless station is configured to determine whether the interference notification signal is received by determining whether the CAF has a peak at α = (m 1 -m 2 +d)/T 0, where T 0 is an OFDM symbol time and d is an integer. a waveform characteristic quantity extracting unit configured to extract a predetermined waveform characteristic quantity attached to an interference notification signal received in an orthogonal frequency division multiplexing, OFDM, communication system from an interfered wireless station of the first communication system, wherein the predetermined waveform characteristic quantity is expressed by a second order cyclic autocorrelation function, CAF, of the OFDM signal, wherein the wireless station is configured to determine whether the interference notification signal is received or not by determining whether the CAF has one or more peaks at a predetermined combination of a cyclic frequency and a lag parameter (α, v); a communication parameter determining unit configured to determine, in response to the waveform characteristic quantity extracting unit extracting the predetermined waveform characteristic quantity, changed communication parameters to be used for communication with a destination wireless station of the second communication system by the wireless station; and a transmission unit (82, 86) and a reception unit (82, 83) configured respectively to transmit and receive a wireless communication signal in the second communication system in accordance with the determined changed communication parameters; wherein the CAF is obtained by multiplying by a factor exp(j2πm 1 k) a k-th signal belonging to a first subcarrier group among a plurality of subcarriers included in the OFDM signal, and multiplying by a factor exp(j2πm 2 k) a k-th signal belonging to a second subcarrier group among the plurality of subcarriers included in the OFDM signal, and the wireless station is configured to determine whether the interference notification signal is received by determining whether the CAF has a peak at α = (m 1 -m 2 +d)/T 0, where T 0 is an OFDM symbol time and d is an integer.