Cellular radio-telephone receiver employing improved technique f

Details Cellular radio-telephone receiver employing improved technique f Cellular radio-telephone receiver employing improved technique f

1991-03-21

1992-08-25

Kuntz, Curtis

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

4552341, 379 60, H04B 138, H04B 106

Patent

active

051426951

ABSTRACT:
In a digital radio-telephone receiver, an open-loop arrangement for generating a received-signal-strength-indicating ("RSSI") value suitable for use in mobile assisted hand-off within a cellular telephone system. The receiver has an amplifier for amplifying a received signal with a gain controlled by a gain-control signal, and an automatic-gain-control circuit ("AGC") responsive to the amplitude of the amplifier output and coupled in a feedback-loop for applying an AGC signal to the amplifier as the gain-control signal. An RSSI value is generated by (i) opening the AGC feedback loop so that the AGC output signal is not applied to the amplifier, (ii) applying a ramp signal of increasing amplitude to the VGA while the AGC monitors the signal envelope, and (iii) when the signal envelope passes a pre-selected threshold, applying the then-occurring ramp-signal value to a calibrated look-up table to obtain the corresponding RSSI value stored therein. Preferably, the receiver also employs a digital multiplexer ("MUX"), which provides to the amplifier as the gain-control signal, in response to a select signal, the ramp signal during a first period of time, and the AGC signal during a second period of time.

REFERENCES:
patent: 4619002 (1986-10-01), Thro
patent: 4747065 (1988-05-01), West
patent: 4868885 (1989-09-01), Perry
patent: 4905305 (1990-02-01), Garner et al.

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