PHASE TRACKING CIRCUIT FOR MULTICARRIER MODULATION SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a circuit which separately corrects the phase rotation detection of phase noise and which suppresses deterioration by permitting separate correction means to correct stationary phase rotation due to a residual carrier frequency error occurred by an automatic frequency control means and to correct phase rotation due to phase noise. SOLUTION: A pilot sub-carrier extraction circuit 207 extracts a pilot sub- carrier signal s208 and outputs a sub-carrier signal s207 except for a pilot sub- carrier signal s208. A phase rotation detection circuit 208 detects a phase rotation signal s209 due to phase noise. Weighting can be executed by using channel transmission functions for the respective sub-carriers, which are estimated by a channel equalizing circuit 203. A phase correction circuit 209 corrects phase rotation quantity duet to phase noise by using the phase rotation signal s209 with respect to the sub-carrier signal s207 and outputs a phase correction signal s2010. A judgment circuit 2010 judges data in accordance with a signal point from a threshold and outputs data s2011.