Presentation 2016-10-17
Detecting Overlapped Signals for Radio Wave Interference Visualization
Akihiro Wada, Tatsuya Kikuzuki, Makoto Hamaminato, Teruhisa Ninomiya,
PDF Download Page PDF download Page Link
Abstract(in Japanese) (See Japanese page)
Abstract(in English) As IoT(Internet of things) systems are increasing, data communication may often be disturbed because of radio frequency interference among the IoT radio systems. We developed a method which can visualize interference of radio wave. The method can mitigate the interference-related problem, using the occupancy of standards. In the congested spectrogram, where signals overlap each other, conventional methods estimate the lower occupancy of standards. In this study, we propose a detection algorithm for overlapped signals which measured the time length, the bandwidth, and the center frequency of signals. In order to detect overlapped signals, the rise time and fall time of signals are searched by using the gradation of the spectrogram in the temporal domain, and the spectral features are obtained by connecting the rise and fall time in the frequency domain. In the result of experiments, we showed the precision of estimating the occupancy of standards was improved compared with the conventional method.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Radio Wave Interference Visualization / Overlapped Signals / Occupancy of Standards
Paper # SRW2016-48
Date of Issue 2016-10-10 (SRW)

Conference Information
Committee SRW
Conference Date 2016/10/17(1days)
Place (in Japanese) (See Japanese page)
Place (in English) Anritsu
Topics (in Japanese) (See Japanese page)
Topics (in English) Network, MAC, Sensor, mmWave, etc.
Chair Hiroshi Harada(Kyoto Univ.)
Vice Chair Masafumi Kato(Fujitsu) / Satoshi Denno(Okayama Univ.)
Secretary Masafumi Kato(NTT) / Satoshi Denno(NICT)
Assistant Wen Yun(Fujitsu) / Keiichi Mizutani(Kyoto Univ.)

Paper Information
Registration To Technical Committee on Short Range Wireless Communications
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Detecting Overlapped Signals for Radio Wave Interference Visualization
Sub Title (in English)
Keyword(1) Radio Wave Interference Visualization
Keyword(2) Overlapped Signals
Keyword(3) Occupancy of Standards
Keyword(4)
1st Author's Name Akihiro Wada
1st Author's Affiliation FUJITSU LABORATORIES LTD.(Fujitsu Labs.)
2nd Author's Name Tatsuya Kikuzuki
2nd Author's Affiliation FUJITSU LABORATORIES LTD.(Fujitsu Labs.)
3rd Author's Name Makoto Hamaminato
3rd Author's Affiliation FUJITSU LABORATORIES LTD.(Fujitsu Labs.)
4th Author's Name Teruhisa Ninomiya
4th Author's Affiliation FUJITSU LABORATORIES LTD.(Fujitsu Labs.)
Date 2016-10-17
Paper # SRW2016-48
Volume (vol) vol.116
Number (no) SRW-249
Page pp.pp.25-30(SRW),
#Pages 6
Date of Issue 2016-10-10 (SRW)