Signal detection device, wireless communication device, and wireless communication terminal

A wireless communication device comprising:

• receiving circuitry configured to receive a radio signal;
• transmitting circuitry configured to transmit a radio signal;
• and
• processing circuitry configured to calculate a first signal level indicative of a signal level of a digital complex signal, calculate a first variation indicative of a temporal variation of the first signal level, calculate a statistic in a predetermined first time period on the basis of the first variation in the first time period, and perform determination regarding whether or not an interference source signal indicative of a signal by a radio wave from an interference source is included in the digital complex signals in the first time period on the basis of the statistic in the first time period, wherein
• the receiving circuitry or the processing circuitry generating a digital complex signal based on the radio signal received via the receiving circuitry, and
• the processing circuitry controlling the transmitting circuitry on the basis of a result of the determination regarding the digital complex signals.

A wireless communication terminal comprising a control circuit configured to:

• generate a digital complex signal from a received radio signal;
• calculate a first signal level indicative of a signal level of a digital complex signal;
• calculate a first variation indicative of a temporal variation of the first signal level;
• calculate a statistic in a predetermined first time period on the basis of the first variation in the first time period;
• perform determination regarding whether or not an interference source signal indicative of a signal by a radio wave from an interference source is included in the digital complex signals in the first time period on the basis of the statistic in the first time period;
• and
• control transmission of a radio signal on the basis of a result of the determination.