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This paper presents a novel injection- and frequency-locked loop (IFLL) for reducing phase noise of wideband oscillators, which uses an injection-locked oscillator (ILO) to amplify and phase-shift the feedback signal in the IFLL. In this paper, the frequency domain analysis is presented to characterize the proposed IFLL and compared with the experimental results. Consequently, the oscillators that...
This paper presents a passive radar to detect human vital signs with ambient WiFi signals. The proposed radar does not contain a transmitting source. Instead, it captures WiFi signals produced by a far IEEE 802.11b/g/n access point and utilizes those signals to perform vital-sign detection according to Doppler effects. The reliability of detection depends on the conditions of WiFi connection, such...
This paper proposes a concurrent spectrum and vital sign sensor using an injection-locked detector. To achieve this goal, two different sensing mechanisms are involved. One is to employ the injection locking and pulling effects in an oscillator to fast detect the frequency and power of a wireless communication signal. The other is to use a self-injection-locked oscillator to detect Doppler shift for...
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