Patent ID: 9614560
Date: 2017-04-04
CPC Classifications: H04B,H04L

Claim:
1. A system for estimating receiver noise variance, said system comprising: an automatic gain control circuit configured to provide an amplifier gain value; a temperature sensing circuit configured to provide a temperature; an antenna switching circuit configured to decouple an antenna from said receiver during a noise figure calibration interval; a signal power measurement circuit configured to measure input power to said receiver; a noise figure estimation circuit configured to estimate a receiver noise figure during said noise figure calibration interval based on an initial receiver noise variance, the temperature and the amplifier gain value, wherein the initial receiver noise variance is estimated based on said measured input power during said noise figure calibration interval; and a noise variance tracking circuit configured to receive the receiver noise figure and to calculate updated estimates of said receiver noise variance, wherein said updated estimates are based on the receiver noise figure, updates of said measured temperature and updates of said measured amplifier gain.