Single-chip discrete multitone generation Herrnsdorf, Johannes; McKendry, Jonathan J. D.; Ferreira, Ricardo ...
2015 IEEE Summer Topicals Meeting Series (SUM),
07/2015
Conference Proceeding
We report report a single-chip device that takes parallel logic input signals and converts them into discrete visible light levels. This is enabled by on/off control of micro-LEDs in an array with ...individual pixel control.
We present data transmission achieved using orthogonal frequency division multiplexing (OFDM) together with violet (405 nm) and ultraviolet (370 nm) micro-sized light-emitting diodes (μLEDs), at data ...rates of 3.32 and 1.31 Gb/s, respectively.
Optical spatial modulation OFDM using micro LEDs Ijaz, Muhammad; Tsonev, Dobroslav; Stavridis, Athanasios ...
2014 48th Asilomar Conference on Signals, Systems and Computers,
11/2014
Conference Proceeding
This paper investigates the performance of optical spatial modulation (OSM) with orthogonal frequency division multiplexing (OFDM) in a multiple-input and multiple-output (MIMO) based visible light ...communication (VLC) system. Gallium nitride micro light emitting diodes (μLEDs) are used as transmitters. The performance of the OSM-OFDM system is analyzed as a function of the spatial separation, d s and the half-power semi-angle, φ 1/2 of the transmitter μLEDs. OSM-OFDM is compared with a standard optical spatial multiplexing (OSMX) OFDM system. The achievable data rate and the computational complexity are considered as performance metrics. The simulation results show that OSMX-OFDM can achieve higher data rates than OSM-OFDM. At the same time, however, OSM-OFDM attains a significantly lower BER and computational complexity than OSMX-OFDM.
This paper reports the progress on an integrated multi-Gigabit multiple input multiple output visible light communication system employing an array of micro-light emitting diodes and photodiodes. A ...system overview and experimental results obtained so far are presented.
Deep UV Micro LEDs (DUV-µLEDs) are attractive for optical wireless communications, however not much is known about their size-dependent characteristics. Here we study spectra, power output and ...bandwidth as a function of device size and achieve a bandwidth of 570MHz with a 20µm diameter device.
A green LED is demonstrated to generate a uniform square illumination pattern for an on-chip imaging flow cytometer system. The proposed system is used to perform the detection of a bead-based ...immunoassay for a sepsis biomarker, procalcitonin.
This letter presents a visible light communication (VLC) system based on a single 50- μm gallium nitride light emitting diode (LED). A device of this size exhibits a 3-dB modulation bandwidth of at ...least 60 MHz - significantly higher than commercially available white lighting LEDs. Orthogonal frequency division multiplexing is employed as a modulation scheme. This enables the limited modulation bandwidth of the device to be fully used. Pre- and postequalization techniques, as well as adaptive data loading, are successfully applied to achieve a demonstration of wireless communication at speeds exceeding 3 Gb/s. To date, this is the fastest wireless VLC system using a single LED.
This letter presents a visible light communication (VLC) system based on a single 50-Formula Omitted gallium nitride light emitting diode (LED). A device of this size exhibits a 3-dB modulation ...bandwidth of at least 60 MHz--significantly higher than commercially available white lighting LEDs. Orthogonal frequency division multiplexing is employed as a modulation scheme. This enables the limited modulation bandwidth of the device to be fully used. Pre- and postequalization techniques, as well as adaptive data loading, are successfully applied to achieve a demonstration of wireless communication at speeds exceeding 3 Gb/s. To date, this is the fastest wireless VLC system using a single LED.
3D reconstruction of objects can be achieved using both time of flight and photometric stereo imaging using four modulated white LEDs, a SPAD camera and a mobile phone. The standard deviation for the ...reconstruction is 4.1 mm at a distance of 70 cm.
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