Patent ID: 8040977
Filing Date: 2011-10-18
Classification: H04L

Abstract:
1. A reception synchronization control device having a demodulator that receives a phase modulated signal and demodulates the received signal into analog demodulated signals of at least two channels, comprising: a signal level detector that detects signal levels of demodulated signals from the analog demodulated signals of at least two channels obtained by receiving a signal transmitted by a phase modulation; a constellation position specifier that extracts sampled demodulated signals displayed on polar coordinates based on the detected signal levels, and specifies constellation positions of a plurality of data contained in the sampled demodulated signals on the polar coordinates; and a phase angle difference calculation processor that calculates a phase angle difference between a phase angle calculated based on the constellation positions of the specified data and a reference phase angle, and the phase angle difference calculation processor establishes reception synchronization of the analog demodulated signals by controlling the phase angle based on the constellation positions of the specified data so that a difference between the phase angle and the reference phase is within a predetermined range.