Patent ID: 6741839
Filing Date: 2004-05-25
Classification: H04B

Abstract:
For use in a wireless network comprising a plurality of base stations capable of communicating with a plurality of mobile devices, each of the plurality of base stations comprising an RF transmitter capable of receiving an input baseband signal and an RF carrier signal and producing therefrom an amplified modulated RF output signal, an ACP monitoring circuit for monitoring adjacent channel power (ACP) noise in the RF output signal comprising:an RF mixer having a first input capable of receiving the RF output signal and a second input capable of receiving the RF carrier signal and producing therefrom a recovered baseband signal on an output of the RF mixer, the recovered baseband signal comprising a desired baseband signal and the ACP noise; a first power detection circuit capable of determining a power level of the ACP noise outside an allocated channel bandwidth of the RF transmitter; a first filter coupled to the RF mixer for isolating the ACP noise; a second filter coupled to the RF mixer for isolating the desired baseband signal, wherein the first power detection circuit measures the power level of the ACP noise at an output of the first filter and measures a power level of the desired baseband signal in the allocated channel bandwidth of the RF transmitter at an output of the second filter; and a switch having a first input coupled to said first filter output, a second input coupled to said second filter output, and an output coupled to said first power detection circuit.