Patent ID: 8391333

Claim:
A preamble detection apparatus in a wireless communication system which performs frequency hopping, comprising: a correlation maximum value detection threshold generation unit that determines a correlation maximum value detection threshold on the basis of a correlation peak value; a correlation maximum value detection determination unit that detects one of correlation results, which exceeds the correlation maximum value detection threshold, as a correlation maximum value; a correlation peak detection unit that updates the correlation peak value to the detected correlation maximum value when the correlation maximum value is detected by the correlation maximum value detection determination unit; and a control unit that sets a period, if a correlation peak caused by an LO (Local Oscillator) spurious component occurs, to a first period, sets a period, centering on a position where a distance from a correlation peak position is an integer multiple of a frequency hopping cycle, to a second period, and monitors presence or absence of a correlation result that exceeds the correlation maximum value detection threshold in the first and second periods, while not applying an erroneous detection threshold to the first period.