Fast AGC for TDMA radio systems

Details Fast AGC for TDMA radio systems Fast AGC for TDMA radio systems

1994-03-23

1996-02-20

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552351, 4552391, 4552452, 375345, H04B 106

Patent

active

054937124

ABSTRACT:
Disclosed is a circuit for automatic gain control (AGC) of random access channels (RACH) and traffic channels in a radio system. The amplitude of the input signal is detected at an intermediate frequency (IF) stage, digitized, and coupled to a digital signal processor (DSP) which produces an AGC signal for reducing the gain of the input when the input crosses a threshold value. For RACH bursts, the AGC signal tracks the input signal when it crosses the threshold and the AGC signal remains at a constant value for the the remainder of the time slot unless and until the input increases a threshold amount over its previous highest value. For traffic channels, the DSP will use the AGC signal from the RACH burst as an initial value and change the AGC signal only if the detected input is outside a predetermined range.

REFERENCES:
patent: 3602825 (1971-08-01), Senior
patent: 4393513 (1983-07-01), Yokogawa
patent: 4829593 (1989-05-01), Hara
patent: 5184349 (1993-02-01), Riordan
patent: 5204976 (1993-04-01), Baldwin et al.
patent: 5251216 (1993-10-01), Marshall et al.
patent: 5276685 (1994-01-01), Kepler et al.

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