SUPPRESSION OF PERIODIC INTERFERENCE IN A COMMUNICATIONS SYSTEM

摘要

Methods, systems, and arrangements enable the generation of a replica of periodic interference that is disturbing a desired signal ( x [ n ]) so as to subtract out an estimation of the periodic interference from the infected signal ( y[ n ]). In certain embodiments, a speech signal from a microphone (205) of a mobile station (115) is infected with "bumblebee" noise. In accordance with the present invention, a received signal includes a desired and an interfering component. The received signal is bandpass filtered (510) around the expected frequency of the interfering component, and a fundamental frequency thereof may thereafter be ascertained (515). Harmonics of the fundamental frequency are generated (520) so as to reconstruct (530) an estimate of the interfering component in the frequency domain using determined weights and Fourier series theory. The interfering component estimate is subtracted (535) form the received signal to determine a desired component estimate. The weights may be optionally adjusted in a feedback loop (550).