Correlating filter and CDMA receiver

Details Correlating filter and CDMA receiver Correlating filter and CDMA receiver

1997-01-14

2000-11-14

Vu, Huy D.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375350, H03D 100

Patent

active

061480444

ABSTRACT:
A correlating filter includes a delay circuit which outputs a plurality of tap output signals TP1 to TPn having different delays. The correlating filter further includes a weighted adder circuit 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 produces a control signal based on the correlated output signal from the weighted adder circuit. The control signal is high in level when the correlated output signal has a correlation peak. A power feed to the weighted adder circuit is achieved via a switching element. The switching element is only turned on when the control signal is high in level so as to enable the power feed to the weighted adder circuit. Thus, reduction in power consumption is achieved and the filter can be used in a portable radio device.

REFERENCES:
patent: 4217586 (1980-08-01), McGuffin
patent: 5151919 (1992-09-01), Dent
patent: 5574747 (1996-11-01), Lomp

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