Patent ID: 6229998
Filing Date: 2001-05-08
Classification: H04B,H04K

Abstract:
In a wireless communication base station, a method for detecting in-band interfering signals comprising the steps of:(a) performing downconversion and bandpass-filtering of a received analog signal to produce a downconverted bandpass-filtered analog signal which resides approximately within a predetermined reverse-link frequency band;(b) performing automatic gain control of said downconverted bandpass-filtered analog signal to produce a first gain-controlled signal whose RMS amplitude is approximately equal to a predetermined value;(c) performing analog-to-digital conversion of said first gain-controlled signal to create a stream of digital samples;(d) performing analysis of said stream of digital samples to create a first set of sub-band power measurements corresponding to the received power associated with adjacent frequency sub-bands, each sub-band representing a fraction of a predetermined spectrum analysis band, said spectrum analysis band representing a superset of said reverse-link frequency band; and(e) performing spectrum evaluation which identifies a group of one or more adjacent sub-band power measurements which exceed a predetermined threshold.