| 摘要 |
PROBLEM TO BE SOLVED: To keep accuracy in data demodulation even in the case of frame synchronism with a delay wave. SOLUTION: The read signal of (T0-n) is sent from a response estimate timing generator 15 to a received signal memory 11, and the synchronizing signal of (T0-2n) is sent to a propagation path estimator 12. The propagation path estimator 12 sends a synchronizing symbol to a transversal filter 21, for which the number of taps is increased by (n) for preceding wave correction, and estimates a propagation path response while using the received signal. Concerning the estimated propagation path response, H(z) is calculated by adding the absolute value of (n) pieces of responses through a response selector 17. The response selector selects the maximum H(z) and sends it to a transmission sequence estimator 13. A deviation (z) from the leading frame position of the selected response is sent to a sequence estimate timing generator 16. The frame position is adjusted forward and data can be demodulated while synchronizing the received signal read and the operation of the transmission sequence estimator. |
