| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for correcting phase difference fluctuation and carrier frequency deviation of a recovered carrier and a reception signal in a receiver having an equalizer to reduce inter-code interference in frequency selective fading. SOLUTION: This system is constituted so that a frequency deviation in a recovered carrier and a reception signal is corrected by a phase locked loop(PLL) circuit and phase difference fluctuation is corrected by a waveform equalization section. Through the constitution above, even if an inter-code interference takes place due to frequency selective fading, the PLL is used to correct the frequency deviation and the waveform equalizer is used to correct phase difference fluctuation, then a detection section has only to synchronize only the frequency, and even when a delay is caused in the operation of the PLL, the carrier is recovered accurately and stably, resulting that an error in transmission series caused by the frequency and phase deviation in the recovered carrier and the reception signal is corrected. |
