Localizing a jammer in an indoor environment in wireless sensor networks becomes a significant research problem due to the ease of blocking the communication between legitimate nodes. An adversary may emit radio frequ...Localizing a jammer in an indoor environment in wireless sensor networks becomes a significant research problem due to the ease of blocking the communication between legitimate nodes. An adversary may emit radio frequency to prevent the transmission between nodes. In this paper, we propose detecting the position of the jammer indoor by using the received signal strength and Kalman filter (KF) to reduce the noise due to the multipath signal caused by obstacles in the indoor environment. We compare our work to the Linear Prediction Algorithm (LP) and Centroid Localization Algorithm (CL). We observed that the Kalman filter has better results when estimating the distance compared to other algorithms.展开更多
A novel 10 GHz eight-phase voltage-controlled oscillator （VCO） architecture applied in clock and data recovery （CDR） circuit for 40 Gbit/s optical communications system is proposed. Compared with the traditional e...A novel 10 GHz eight-phase voltage-controlled oscillator （VCO） architecture applied in clock and data recovery （CDR） circuit for 40 Gbit/s optical communications system is proposed. Compared with the traditional eight-phase oscillator, a new ring CL ladder filter structure with four inductors is proposed. The VCO is designed and fabricated in IBM 90 nm complementary metal-oxide-semiconductor transistor （CMOS） technology. Measurement results show the tuning range is 9.2 GHz-11.0 GHz and the phase noise of - 108.85 dBc/Hz at 1 MHz offset from the carrier frequency of 10 GHz. The chip area of VCO is 500 μm × 685 μm and the power dissipation is 17.4 mW with the 1.2 V supply voltage.展开更多
文摘Localizing a jammer in an indoor environment in wireless sensor networks becomes a significant research problem due to the ease of blocking the communication between legitimate nodes. An adversary may emit radio frequency to prevent the transmission between nodes. In this paper, we propose detecting the position of the jammer indoor by using the received signal strength and Kalman filter (KF) to reduce the noise due to the multipath signal caused by obstacles in the indoor environment. We compare our work to the Linear Prediction Algorithm (LP) and Centroid Localization Algorithm (CL). We observed that the Kalman filter has better results when estimating the distance compared to other algorithms.
基金supported by the National High Technology Research and Development Program of China(2011AA010301)the National Natural Science Foundation of China(60976029)
文摘A novel 10 GHz eight-phase voltage-controlled oscillator （VCO） architecture applied in clock and data recovery （CDR） circuit for 40 Gbit/s optical communications system is proposed. Compared with the traditional eight-phase oscillator, a new ring CL ladder filter structure with four inductors is proposed. The VCO is designed and fabricated in IBM 90 nm complementary metal-oxide-semiconductor transistor （CMOS） technology. Measurement results show the tuning range is 9.2 GHz-11.0 GHz and the phase noise of - 108.85 dBc/Hz at 1 MHz offset from the carrier frequency of 10 GHz. The chip area of VCO is 500 μm × 685 μm and the power dissipation is 17.4 mW with the 1.2 V supply voltage.
