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This paper investigates the performance of underwater visible light communications (UVLC) systems employing multiple transmitters and/or multiple receivers to exploit the advantage of spatial diversity. Experimental results are further provided to evaluate the error performance of single input multiple outputs (SIMO), multiple inputs single output (MISO) and multiple inputs multiple outputs (MIMO)...
In this paper a Direct Sequence Spread Spectrum (DSSS) based offline wireless white light communication system is established. Field measurements are conducted to compare the performance with and without DSSS. The experimental results show that the DSSS is able to improve performance obviously.
The paper presents a hybrid orthogonal frequency division multiplexing (OFDM) — wavelength division multiplexing (WDM) visible light communication (VLC). Direct detection is adopted in place of complex digital signal processing such as channel estimation and channel equalization, or even forward error corrections. Generic red, green and blue light emitting diodes (LED) are used for high-speed WDM...
We propose a non-imaging MIMO-OFDM based VLC, and analyzed its bit-error-rate (BER) performance for different LED arrangements. Rectangular LED arrangement offers improved BER compared to the linear arrangement for a range of higher-order modulation schemes.
We have proposed and successfully demonstrated a new architecture of MMW RoF system with wavelength reuse to deliver VHT data/video services. Based on PolM-to-IM conversion, frequency multiplied MMW (54.8-GHz) and intensity-free OC with slight phase fluctuation were received by adjusting PCs. 1.0-Gb/s OOK DS signal has been transmitted over 25-km SMF and air links. Meanwhile, successful transmission...
In this paper, we propose a visible light communication (VLC)-based indoor positioning system (IPS) and algorithm using dual-tone multi-frequency (DTMF) technique. Compared with the existing VLC-based IPS algorithms, our algorithm does not need clock synchronization to separate signals from different time slots. With simple procedures, the coarse position or specific position of the mobile can be...
The copper interconnects cannot keep pace with the IC interconnect requirements as the feature size continues to scale down to nanoscale. Theoretical works predicted that carbon nanotube (CNT) is more superior than copper for future VLSI interconnects in terms of electrical conductivity, thermal management and reliability. Technology breakthroughs are required to bridge the gaps between the theoretical...
One major disadvantage of OFDM is that the time domain OFDM signal which is a sum of several sinusoids leads to high peak to average power ratio (PAPR). The precoding scheme based on pulse shaping is an effective and flexible way for reducing the peak-to-average power ratio (PAPR) of OFDM signals. Clipping technique is the most simple reduction PAPR method. However, clipping degrades the bit-error-rate...
This paper propose a novel slot antenna with pattern reconfigurability. The planar antenna is fabricated on the top side of a FR4 substrate and the microstrip feeding line is fabricated on the back side of the board. the proposed antenna demonstrates reconfigurable radiation patterns in the frequency range from 3 to 5.5 GHz. Pin diodes are used to change the radiation patterns of the proposed antenna...
Implantable biomedical actuators are highly desired in modern medicine. However, how to power up these biomedical implants remains a challenge since most of them need more than several hundreds mW of power. The air-core based radio-frequency transformer (two face-to-face inductive coils) has been the only non-toxic and non-invasive power source for implants for the last three decades [1]. For various...
Transformer-based inductively coupled near-field wireless links have been extensively studied in the past three decades as a means of transferring power to implanted biomedical devices. Even with deliberative optimizations, the reported maximum transferred power is limited to 275 mW over 1-cm[1]. In this paper, a novel wireless power transfer link is described that uses a rotating magnet to transfer...
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