| 摘要 |
When reception of a multiplexed wave to be PSK-modulated of BPSK, QPSK, and 8PSK is started, a selector (16A) of a demodulating circuit (1A) reads high-order three bits .DELTA..phi.(3) of phase error data corresponding to I and Q symbol streams out of one phase error table (15-1) for BPSK among phase error tables provided for each modulation system and each phase rotation angle. A received-signal-phase rotation angle detecting circuit (8A) detects phase rotation angles of portions corresponding to bits (1) and (0) of a frame-synchronizing signal of a received symbol stream from the .DELTA..phi.(3) and the MSB of I symbol stream and outputs the phase rotatio n angles to a remapper (7) to make the remapper perform absolute phasing. The selector (16A) reads phase error data corresponding to a received symbol stream out of a phase error table corresponding to a modulation system and a phase rotation angle identified by a transmission-configuration identifying circuit (9), outputs the phase error data to a D/A converter (17), corrects a phase of a reference carrier wave for orthogonal detection, and makes a received-signal point become a constant phase for a transmitted-signal point.
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