simulation and the measurement are listed in Table 1. The photos of the experimental circuit are given in Figure 7.
CONCLUSIONThis letter presents a quasilumped approach of the MMR SSL BPF design with a source-load coupling structure. The lumped-elements approach is successfully applied to design and analyze the circuit's performance. The source-load-coupling created transmission zeros have effectively enhanced the circuit's signal selectivity. The equivalent LC circuit model is intuitive, accurate, and comprehensive. The demonstrated BPF achieves benefits of very low-insertion losses, compact size, and excellent noise interference immunity. It is believed that the quasilumped approach of the MMR SSL BPF should be very useful in the further filter design.ABSTRACT: In this article, we propose an indoor location estimation algorithm that uses the signal extinction ratio distribution of LED-based visible light communication. To improve the positioning accuracy, we use the received extinction ratio from different LED transmitters. In order to mitigate interference between transmitters, a location code was sent using time division multiplexing (TDM). We verified the feasibility of the proposed position estimation algorithm with an experimental demonstration. The proposed algorithm provided positioning accuracy with a 1.5787-cm mean distance error for a given equilateral triangle cell with three 60-cm sides.ABSTRACT: This article studies the bias and oscillation-amplitude dependent RF tuning property of varactor-switching dual-band voltagecontrolled oscillators (VCOs). The dual-resonance LC-tank n-core and p-core VCOs have been fabricated using 0.18 lm CMOS technology, and they use dual-resonance LC resonator consisted of a parallel-tuned LC resonator and a series resonant resonator. The accumulation-mode MOS varactors are used. The RF circuit parameters such as oscillation frequency, tuning range, and transition frequency between low-band and high band as a function of varactor bias, supply voltage, and oscillation amplitude are examined experimentally.
Carrier allocation-visible light communication (CA-VLC) has been spotlighted as a new means of building networks with location-based service that provides designated information to a given area without inter-cell interference. The authors propose and demonstrate digitalised single side-band (SSB) orthogonal frequency division multiplexing (OFDM) signal transmission with bit and power loading, which improve spectral efficiency to modulate multiple signals, in order to provide convergence services in the CA-VLC system. The transmission of SSB-OFDM is implemented by the Hilbert transform relation between real and imaginary parts of the OFDM signal. Sideband selectivity and its radio frequency (RF) carrier generation are easily achieved in digital signal processing along with SSB-OFDM generation that can dramatically increase the flexibility in a CA-VLC system.
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