GROUP DEMODULATOR FOR PHASE MODULATION SIGNAL

摘要

PURPOSE:To provide a group demodulator provided to a satellite equipment with a small size, light weight and low power consumption. CONSTITUTION:An input FDM signal is converted and separated into a base band digital signal for each channel and fed to a deviation detection means 31 and a multiplex circuit 45. The signal is inserted into each channel, its instantaneous power is detected and a minimum variance based on each reference clock is detected by a detection means 36 as a clock timing ts of a symbol in the deviation detection means 31. An output of an insertion filter 34 is sampled in the timing and a phase angle theta as to data is detected from the sample value and an error frequency and phase are detected. A cosine and a sine signal of the error frequency and phase are subjected to complex multiplication to a phase modulation signal corresponding to each channel by a correction means 46, the carrier is corrected and the corrected signal is separately stored in start-stop memories 491-49m, and a delay corresponding to the ts of each channel is given to the start-stop memories 491-49m and an output of each start-stop memory is stored in buffer circuits 511-51m and inputted to a filter for each channel at a multiplex circuit and an impulse response is interpolated and the resulting signal is regenerated.