Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1997-12-24
2000-03-14
Nguyen, Lee
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455136, 455138, 4552342, 4552321, 375345, H04B 106
Patent
active
060384352
ABSTRACT:
An AGC method and apparatus is provided for a receiver to control the signal power of a received RF signal over a wide dynamic range and significantly reduce the ADC clipping time to a level appropriate for cellular communications. The AGC apparatus comprises an ADC (analog-to-digital converter) for generating digital samples of a received signal, a controller for providing a receiver gain setting based on the digital samples generated and an actuator for applying the receiver gain setting. The controller compares digital samples generated by the ADC to a first predetermined reference level, accumulates an error signal, calculates an attenuation adjustment based on the accumulated error signal and sums the attenuation adjustment with a previously calculated receiver gain setting for providing the actuator with an updated receiver gain setting which is applied therein. The digital samples are also compared to a second predetermined reference level for alternatively providing the updated receiver gain setting by decreasing the previously calculated receiver gain setting by a fixed amount.
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Jama Isaak R.
Nguyen Lee
Nortel Networks Corporation
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