Presentation 2014-10-30
Prediction of Next ON/OFF State of Primary System by Nth-order Markov Chain(Poster session)
Ryota Nakanishi, Mai Ohta, Makoto Taromaru,
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Abstract(in English) In this study, we propose a method that predicts the next ON/OFF state of a primary system (PS) by Nth-order Markov chain with a maximum likelihood estimation method in order to reduce the times of spectrum sensing. Cognitive radio (CR) needs to sense the surrounding wireless environment. Because spectrum sensing consumes power, we consider reducing the times of the spectrum sensing by the prediction of the state sequence. A secondary system (SS) detects a white space (WS) where the PS does not use the channel. The SS observes the surrounding wireless environment by using an energy detection and garners the state sequence. Then, the SS analyzes the accumulated data and predicts the next ON/OFF states. We model PS as from two-states to 2^N states with the maximum likelihood estimation method and the SS can obtain reliable predictions without the spectrum sensing. The larger N is, the more SS can obtain reliable predictions. Because, the SS can decrease the times of spectrum sensing, as a result, the proposed method can reduce power consumption due to the sensing and the result transmission maintaining the required accuracy. Therefore, it is important that we know the state sequence length for the reliable predictions. In this paper, we show the correct prediction probability in each Nth-order Markov chain and evaluate the times of spectrum sensing by computer simulation.
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Keyword(in English) Markov Chain / Maximum Likelihood Estimation / Spectrum Sensing / Cognitive Radio
Paper # SR2014-66
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Conference Date 2014/10/23(1days)
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Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Prediction of Next ON/OFF State of Primary System by Nth-order Markov Chain(Poster session)
Sub Title (in English)
Keyword(1) Markov Chain
Keyword(2) Maximum Likelihood Estimation
Keyword(3) Spectrum Sensing
Keyword(4) Cognitive Radio
1st Author's Name Ryota Nakanishi
1st Author's Affiliation Graduate School of Fukuoka Univercity()
2nd Author's Name Mai Ohta
2nd Author's Affiliation Fukuoka Univercity
3rd Author's Name Makoto Taromaru
3rd Author's Affiliation Fukuoka Univercity
Date 2014-10-30
Paper # SR2014-66
Volume (vol) vol.114
Number (no) 284
Page pp.pp.-
#Pages 2
Date of Issue