DIGITAL QUADRATURE DEMODULATION RECEIVER

PROBLEM TO BE SOLVED: To provide a digital quadrature demodulation receiver which converts a received intermediate frequency signal into a digital signal directly to perform a digital quadrature demodulation processing in a communication device. SOLUTION: The receiver comprises an intermediate frequency conversion section for converting a received quadrature modulation signal into an intermediate frequency signal within a double of an occupied signal bandwidth, an analog- digital conversion section for converting an intermediate frequency signal from an intermediate frequency amplifier into a digital signal, and a demodulation processing section for the quadrature demodulation of the digital signal from the analog-digital conversion section and outputting a reception data based on demodulated I and Q signals.