An apparatus and method for automatic gain control in spread-spectrum communications
includes an automatic gain control apparatus for a spread-spectrum receiver, including
a received signal strength indicator, an analog amplifier in signal communication
with the received signal strength indicator, an analog-to-digital converter in
signal communication with the analog amplifier, a digital automatic gain control
loop in signal communication with the analog-to-digital converter, and a digital-to-analog
converter in signal communication with the digital automatic gain control loop
for providing a signal indicative of a digital gain to the analog amplifier; where
the corresponding method for automatic gain control in spread-spectrum communications
includes receiving an analog signal, measuring the strength of the received analog
signal, deriving a first analog gain in correspondence with the measured strength,
applying the derived first analog gain to an analog amplifier, deriving a second
analog gain from a pilot channel signal within an automatic gain control loop,
deriving a digital gain from the pilot channel signal within the automatic gain
control loop, and applying an automatic gain control signal indicative of the second
analog gain and the digital gain to the analog amplifier.