Patent ID: 6975691
Filing Date: 2005-12-13
Classification: H04L

Abstract:
1. A receiver comprising: a demodulation means for demodulating a PSK modulated signal of digital signals modulated by a plurality of different PSK modulation methods (e.g. BPSK. QPSK. 8PSK) having different numbers of phases and multiplexed in time, by using carriers (f c1 and f c2 ) reproduced by carrier reproduction means, and outputting I and Q symbol stream data (I( 8 ), Q( 8 )); a reception signal phase rotation angle detection means for detecting a phase rotation angle relative to a transmission side of the I and Q symbol stream data output from said demodulation means; and an inverse phase rotation means ( 7 ) for inversely rotating a phase of the I and Q symbol stream data output from said demodulation means by a phase rotation angle (OR( 3 )) detected by said reception signal phase rotation angle detection means, thereby performing absolute phasing, wherein the carrier reproduction means of said reproduction means has phase error tables ( 13 , 14 - 1 , 15 - 1 ) for respective ones of the plurality of PSK modulation methods, the tables storing carrier phase error data for various demodulated I and Q symbol stream data pairs, and while said demodulation means demodulates a reception signal corresponding to a specific one of the PSK modulation methods, phase error data (ΔΦ( 8 )) corresponding to the demodulated I and Q symbol stream data is read from the phase error table corresponding to the specific modulation method to correct the phase of the carriers, the receiver being characterized in that: while said demodulation means (