CHARACTERISTIC BOUNDARY INDENTIFYING METHOD FOR DATA GROUP, METHOD AND DEVICE FOR ESTIMATING RADIO WAVE PROPAGATION

摘要

PROBLEM TO BE SOLVED: To provide a characteristic boundary identifying method for estimating the boundary of changing characteristics without depending on the subjectivity of an analyst. SOLUTION: A lateral axis is a distance (d) from a transmission station to a reception station, and a longitudinal axis is a propagation loss value (p). A breakpoint position dj is determined and the transmission station is divided into an area Rj before a breakpoint and an area Rj+1 after the breakpoint. The processing for approximating a function for each area and calculating a mean square error ej (di ) is performed while changing the breakpoint position di . An evaluation function E(di ) is calculated for each breakpoint position di . The evaluation function E(di ) adds a weight value wj to the mean square error ej (dj ) and is normalized by this weight value wj . Based on the evaluation function E(di ), the suitable breakpoint position is identified and discriminated.