| 摘要 |
PURPOSE:To improve the detection accuracy of frequency offset without thickening a cable which supplies a phase value. CONSTITUTION:A reception signal is converted to an in-phase signal and an orthogonal component at a synchronous detection circuit 2, and an identification point is detected at a reception filter 3 based on those signals. Processing to estimate roughly the frequency offset by a slot synchronous symbol is applied to the output signal of the reception filter 3 at an offset rough estimation circuit 4. When such signal is inputted to an offset estimation and phase control circuit 5, processing to re-estimate the frequency offset by using a pilot symbol is performed. Furthermore, phase control processing is applied to a signal whose frequency offset is estimated, and the frequency offset is corrected. A signal whose frequency offset is corrected is decoded by a Gray decoder 6. |
