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In this paper, we propose a wireless battery charging system which the power transfer position can be automatically moved to the optimal charging placement. The proposed charging system is based on the electromagnetic inductive power transfer technique which is a short distance power transfer system. As a result, we have successfully finished the implementation of the proposed wireless battery charging...
This paper investigates the possibility of using a vibration energy harvesting (VEH) device as a communication receiver. By modulating the ambient vibration energy using a transmitting speaker, and demodulating the harvested power at the receiving VEH, we aim to transmit small amounts of data at low rates between two proximate devices. The key advantage of using VEH as a receiver is that the modulated...
Prior research has shown the potential of device-free WiFi sensing for human activity recognition. In this paper, we show for the first time WiFi signals can also be used to uniquely identify people. There is strong evidence that suggests that all humans have a unique gait. An individual's gait will thus create unique perturbations in the WiFi spectrum. We propose a system called WiFi-ID that analyses...
Achieving energy-efficiency is a challenging task in human activity monitoring. The continuous activity sensing using accelerometer and the burdensome on-node classification rapidly deplete the limited battery resource of the wearable nodes. To reduce the energy overhead and achieve the system energy-neutrality, we present a novel Bayesian framework for human activity monitoring using the energy-harvesting...
Following rising demands in positioning with GPS, low-cost receivers are becoming widely available; but their energy demands are still too high. For energy efficient GPS sensing in delay-tolerant applications, the possibility of offloading a few milliseconds of raw signal samples and leveraging the greater processing power of the cloud for obtaining a position fix is being actively investigated. In...
This work presents a novel peak-to-average power ratio (PAPR) reduction scheme, namely extended selected mapping (eSLM), in space-frequency block coding (SFBC) MIMO-OFDM systems. By introducing phase rotations and amplitude extensions into so-called extension matrices, the candidate signals with lowest PAPR can be selected and the receiver is able to identify index of the selected candidate without...
Orthogonal Walsh-Hadamard sequences have been adopted for peak-to-average power ratio (PAPR) reduction without sending side information in pilot-aided orthogonal frequency division multiplexing systems. The PAPR reduction performance is determined by the number of orthogonal sequences, which is equal to the sequence length. However, increasing the length of pilot sequences significantly degrades bandwidth...
In this paper the design of a programmable gain amplifier (0 dBdivide15 dB, 3 dB per step) embedded in the analog base-band chain for UWB Receivers in a standard 90 nm CMOS technology is presented. The design has been realized using a proper Matlab procedure. Due to the large bandwidth required in the UWB Receivers, the procedure takes into account the second order effects related with the opamp parasitic...
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