Linearized digital automatic gain control

Details Linearized digital automatic gain control Linearized digital automatic gain control

1995-09-15

1997-05-06

Chin, Stephen

Pulse or digital communications

Transceivers

375345, 4552341, 4552501, 455115, H04B 138, H04L 516

Patent

active

056278578

ABSTRACT:
The present invention provides linear, digital automatic gain control (AGC) in a radio. A received signal is demodulated to provide I and Q digital baseband signals. A received signal strength indication is determined from these signals and the resulting digital signal is adjusted to provide a logarithmic response. This signal is then integrated to provide a digital receive AGC adjust signal. For the transmit AGC adjust, the digital receive AGC adjust signal is filtered and then summed with a scaled closed loop power control command. The closed loop power control commands are ignored if they would result in increasing the transmit gain beyond the amplifier's designed maximum output. The result of the sum operation converted from digital to analog for adjusting the amplifier. The outputs of the transmit and receive AGC amplifiers are linearized by transmit and receive linearizers, respectively, which pre-distort the digital AGC adjust signals prior to digital to analog conversion.

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Samir Soliman et al., "CDMA Reverse Link Open Loop Power Control", IEEE Communications Society, vol. 1 of 3, Jun. 12, 1992, pp. 69-73.

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