| 摘要 |
PURPOSE:To provide the burst signal demodulation circuit using a preamble for carrier recovery and clock recovery in common to reduce the preamble. CONSTITUTION:As a preamble in common to carrier recovery and clock recovery, 1001, 0110, 1100 or repetition of 0011 are used. A received input is applied to an orthogonal detection circuit 10 and a sample circuit 11, from which a sampled value (CA) is outputted. Correlation (C, S) of a cosine and a sine signal with the same frequency as that of the sampled value (CA) and the preamble signal is obtained. A carrier phase estimate circuit 30 obtains a carrier phase estimate signal (U) from the correlation (C, S) and a detection circuit 14 provides a demodulation signal (E) based on the multiplication between the signal (U) and the sampled value (CA). A clock signal (F) applied to the sample circuit 11 is obtained from the correlation (C, S) by a clock recovery circuit 40. |
