| 摘要 |
PURPOSE: To eliminate a need of synchronism in a diffusion area and to high- speedily acquire the TDD frame synchronism by using the peak of the absolute value of the signal outputted from a correlation part as a synchronizing signal. CONSTITUTION: A correlation part 1 takes a reception base band signal as the input and diffuses it in the same manner as the transmission side to output the correlation value having the polarity. A polarity detection part 2 detects the polarity of the correlation value and outputs the detected absolute value to a correlation integration part 6. A comparison part 4 compares the detected absolute value with a set threshold and outputs the comparison result to an AND part 5. This part 5 operates AND between outputs of the detection part 3 and the comparison part 4 to output only the absolute value exceeding the threshold or the comparison part 4. A peak phase detection part 8 detects the peak of the absolute value, and the center of the time area of the bit rate length for integration in the integration part 6 and the peak position are compared with each other to output an error signal. A PLL 9 controls the phase of the bit rate in response to the error signal and outputs a correlation integral value having the polarity, and it is used as the synchronizing signal. |
