| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a correlation detection circuit that can detect a correlation with sufficient detection accuracy while the circuit scale and the power consumption are reduced. SOLUTION: A matched filter 11 calculates a correlation with respect to a reference code with 1/4 length of a spread code. A reference code setting section 12 uses two codes set by extracting parts of the spread code from different parts by 1/4 length each as reference code and selectively sets them to the matched filter 11 during one detection period, and the matched filter 11 detects the correlation twice. A multi-stage register 15 latches the correlation obtained from the matched filter 11 firstly and an adder 13 sums the latched correlation to the correlation obtained by the matched filter 11 secondly to calculate the final correlation.</p> |
