| 摘要 |
PROBLEM TO BE SOLVED: To estimate interference radio wave information indicating a generation frequency or a time occupancy ratio of an interference radio wave for each interference source.SOLUTION: A radio environment estimation method includes the steps of: measuring reception power of a received interference radio wave, further acquiring a frame time that is obtained by demodulating the interference radio wave, as successfully demodulated frame information, acquiring a time of an interference radio wave that cannot be demodulated even by reception power equal to or higher than a predetermined threshold, as demodulation disabled radio wave information and recording them as interference radio wave time-series information S11; calculating interference radio wave statistic information by performing statistic processing on the interference radio wave time-series information for a predetermined statistic period S12; and calculating interference radio wave information indicating the generation frequency and the time occupancy ratio of the interference radio wave for each interference source by defining arrival of partial or all interference radio waves based on a stochastic arrival process and solving a relational expression between the interference radio wave statistic information and the interference radio wave information based on a state transition model representing an operation of an access control system of one of transmission stations S14.SELECTED DRAWING: Figure 2 |
