| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital matched filter that reduces the power consumption and obtains a correlation value, with respect to a spread spectrum signal with code length of a plurality of kinds. SOLUTION: A spread code shift control means 600a circulates a spread code stored in coefficient registers 201-204 to provide the output of the spread code stored in the coefficient registers 201-204 to a multiplier section 300. A flag shift control means 600b circulates flag data in flag registers 501-504. As a result, reception registers 101-104 sequentially receive the flag data and store a spread spectrum signal by every reception of data. The spread spectrum signal stored in the reception registers 101-104 is respectively given to corresponding multipliers 301-304, where the signal is multiplied with the spread code and an adder section 400 sums the results of multiplication U0-U3 to obtain a correlation value. |
