| 摘要 |
PURPOSE:To provide a frequency error detection circuit where stable frequency error information can be always obtained by calculating a frequency error between transmission and reception through the use of fading distortion quantity data obtained from a pilot symbol. CONSTITUTION:A received wave signal to be modulated is converted into a complex base band signal by a detection part 1. A frame detection part 2 and a timing reproduction part 3 reproduce frame timing and symbol timing. A fading compensation part 4 execute fading compensation by reproduced frame timing and symbol timing. Frequency offset quantity is calculated from fading distortion quantity data in the pilot symbol used for fading compensation, and the average value of obtained frequency offset quantity is set to be frequency error information. Since the frequency error between transmission and reception can be detected, the occurrence of error detection owing to the characteristic fluctuation of a circuit element is prevented. |
