| 摘要 |
PROBLEM TO BE SOLVED: To make the scale of circuits of the device small. SOLUTION: When reception of a multiple PSK modulated wave such as BPSK, QPSK and 8PSK is started, a selector 16A of a demodulation circuit 1A reads high-order 3-bit Δϕ'(3) of phase error data corresponding to I, Q symbol streams from among a phase error table 15-1 of BPSK which is prepared by modulation systems and phase rotating angles. A reception signal phase rotating angle detecting circuit 8A detects a phase rotating angle of part of the received symbol stream, corresponding to bits (1), (0) of a frame synchronizing signal of a received symbol stream on the basis of the Δϕ'(3) and an MSB of a Q symbol stream, outputs the angle to a re-mapper 7, where absolute phase processing is conducted. A selector 16A reads phase error data, corresponding to the received symbol stream from a phase error table in response to the modulation system and the phase rotating angle identified by a transmission configuration identification circuit 9, outputs the data to a D/A converter 17, where the phase of a reference carrier for orthogonal detection and a phase of a received signal point is kept constant, with respect to a transmission signal point. |
