INTERFERENCE DETECTION SYSTEM FOR HAND-OFF SYSTEM CONDUCTED MAINLY BY MOBILE STATION

摘要

PURPOSE:To prevent degradation the talking quality due to an external wave during talking by monitoring the quality of the signal at a radio base station and detecting the interference of the incoming signal due to an external wave incapable of being recognized by a conventional system. CONSTITUTION:The incoming signal of a mobile station 50 is received by the antenna 300 of a radio base station 200-1, demodulated by a receiver 302 via a filter 301 and inputted to a header detector 303. A Viterbi decoder 304 inputs the difference between the maximum and minimum value of pathmetric value with correlation with signal quality to a comparator 305, compares it with the content of a buffer 306 and outputs a smaller value. A signal controller 307 obtains the signal quality from the difference in the pathmetric and discriminates whether it is the reception electric field deterioration from the mobile station 50 or the signal quality degradation due to an interference wave. When it is discriminated to be signal quality degradation due to an interference wave. When it is discriminated to be signal quality degradation due to an interference wave, the the signal controller 307 reports a signal requesting the change into other frequency capable of being used in a radio base station 200-1 to the control station 100.