Cochannel interference measurement in mobile radio systems

Abstract

A new cochannel interference measurement method for mobile communications, which uses the beat phenomena in the resultant envelope of signal and interference, is proposed. This method has been proven both theoretically and experimentally able to measure CIR up to 15 dB within a fading frequency of 80 Hz. The interference measurement circuit using a widely available 1-chip microprocessor is designed. The program and data memories is about 2k byte. Further, an interference reduction effect by intra-zone channel reassignment, in the case of increasing interference, is clarified by computer simulation. Intra-zone channel reassignment is achieved by using both the cochannel interference measurement and channel exchange techniques.