| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Outline of Final Research Achievements |
It is necessary to develop precise spectrum occupancy rate (SOR) measurement techniques for estimating available white space. We have proposed an advanced CDF (Cumulative Probability distribution Function) based SOR measurement method by simultaneous estimation of spectrum occupancy rate and average power of Gaussian noise to improve SOR measurement performance in low SNR environments even if noise uncertainty exists. To confirm the validity of the proposed method, we have developed a proto-type SOR measurement system and have evaluated SOR measurement performance in AWGN and fading environments by computer simulations and experiments. The evaluated results show that the proposed method can measure SOR maintaining SOR error less than 2% in AWGN channel for SNR>2dB and in frequency selective fading channel for SNR>12dB even if noise uncertainty exists. Furthermore, it is demonstrated that the proposed method can measure SNR of wireless packet signals.
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