| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal detector and a signal detection method which detects a frame duration without demodulating a general signal including signals from a wide variety of different systems.SOLUTION: Before a preamble detection unit 101 carries out preamble detection, a threshold control unit 103 sets a first threshold value obtained by adding a first level margin value to average power of an input signal outputted from an average power calculation unit 102. After the preamble detection unit 101 carries out the preamble detection, the threshold control unit 103, when the average power of the input signal outputted from the average power calculation unit 102 is less than the first threshold value, sets a second threshold value obtained by subtracting a second level margin value from the average power. A power detection unit 104, when signal power continues to be less than the second threshold value for a prescribed determination time, determines the termination of a frame duration. |
