ORTHOGONAL DEMODULATION DEVICE, ORTHOGONAL DEMODULATION METHOD, AND PROGRAM FOR ORTHOGONAL DEMODULATION

摘要

Provided is an orthogonal demodulation device, which makes effective use of the result of an orthogonal detection so as to improve a demodulation efficiency. The orthogonal demodulation device comprises an orthogonal detector (DT) for orthogonally detecting a received signal obtained by receiving a radio wave from a radio discrimination tag, thereby to generate an in-phase signal and an orthogonal phase signal, and a demodulating circuit (DM) for detecting the preamble of a specific transition pattern from at least one of the in-phase signal and the orthogonal phase signal, for decoding at least one of the in-phase signal and the orthogonal phase signal so as to attain the data subsequent to that preamble, and for performing an error detection on the decoding result so as to confirm the existence of an error.