CDMA receiver and DCMA demodulator with AGC circuit

Details CDMA receiver and DCMA demodulator with AGC circuit CDMA receiver and DCMA demodulator with AGC circuit

2005-02-08

2005-02-08

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S242200, C375S345000

Reexamination Certificate

active

06853837

ABSTRACT:
A CDMA demodulator is disclosed, which comprises an AGC loop (13to20) including a IF signal converter (12) for converting a spread spectrum signal to an IF signal and an AGC amplifier (13) for variable gain amplifying the IF signal with a control voltage. The AGC loop also includes a power level calculating unit (17) for calculating the level of full power in the band of a channel under reception. Desirably, the power level calculating unit (17) starts the power level calculation from an instant corresponding to the forefront of slot. Desirably, the AGC loop further includes a control unit (18), which calculates control time based on the result of calculation in the power level calculating unit and feeds out a control voltage by calculating and controlling the control timing based on control amount. The power level calculating unit may start the power level calculation from an intermediate part of slot instead of the forefront thereof.

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