Korrelationsfilter und CDMA-Empfänger

摘要

The present invention provides a correlating filter which are reduced in power consumption and can be used in a portable radio device. A correlating filter includes a delay circuit (1) which outputs a plurality of tap output signals TP1 to TPn having different delays. The correlating filter further includes a weighted adder circuit (2) which weights the tap output signals, respectively, and adds the weighted tap output signals so as to derive a correlated output signal. A timing control circuit (3) produces a control signal based on the correlated output signal from the weighted adder circuit (2). The control signal is high in level when the correlated output signal has a correlation peak. A power feed to the weighted adder circuit (2) is achieved via a switching element (4). The switching element (4) is only turned on when the control signal is high in level so as to enable the power feed to the weighted adder circuit (2). Thus, reduction in power consumption is achieved.