- Electrical and Electronic Engineering - Research Publications
Electrical and Electronic Engineering - Research Publications
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ItemHigh-speed indoor optical wireless communication system with single channel imaging receiverWang, K ; Nirmalathas, A ; Lim, C ; Skafidas, E (OPTICAL SOC AMER, 2012-04-09)In this paper we experimentally investigate a gigabit indoor optical wireless communication system with single channel imaging receiver. It is shown that the use of single channel imaging receiver rejects most of the background light. This single channel imaging receiver is composed of an imaging lens and a small photo-sensitive area photodiode attached on a 2-axis actuator. The actuator and photodiode are placed on the focal plane of the lens to search for the focused light spot. The actuator is voice-coil based and it is low cost and commercially available. With this single channel imaging receiver, bit rate as high as 12.5 Gbps has been successfully demonstrated and the maximum error-free (BER<10⁻⁹) beam footprint is even larger than 1 m. Compared with our previous experimental results with a single wide field-of-view non-imaging receiver, an improvement in error-free beam footprint of >20% has been achieved. When this system is integrated with our recently proposed optical wireless based indoor localization system, both high speed wireless communication and mobility can be provided to users over the entire room. Furthermore, theoretical analysis has been carried out and the simulation results agree well with the experiments. In addition, since the rough location information of the user is available in our proposed system, instead of searching for the focused light spot over a large area on the focal plane of the lens, only a small possible area needs to be scanned. By further pre-setting a proper comparison threshold when searching for the focused light spot, the time needed for searching can be further reduced.
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ItemPerformance analysis of optimized millimeter-wave fiber radio linksKurniawan, T ; Nirmalathas, A ; Lim, C ; Novak, D ; Waterhouse, R (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-02)
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ItemAnalysis of optical carrier-to-sideband ratio for improving transmission performance in fiber-radio linksLim, C ; Attygalle, M ; Nirmalathas, A ; Novak, D ; Waterhouse, R (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-05)
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ItemDigitized Radio-Over-Fiber Technologies for Converged Optical Wireless Access NetworkNirmalathas, A ; Gamage, PA ; Lim, C ; Novak, D ; Waterhouse, R (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2010-08-15)
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ItemMultichannel Digitized RF-Over-Fiber Transmission Based on Bandpass Sampling and FPGAYang, Y ; Lim, C ; Nirmalathas, A (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2010-11)
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ItemEnabling Technologies Incorporating Optical Tandem Single Sideband for Optical-Wireless Integrated Access NetworksLim, C ; Lee, K-L (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2010-05-15)
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ItemFiber-Wireless Networks and Subsystem TechnologiesLim, C ; Nirmalathas, A ; Bakaul, M ; Gamage, P ; Lee, K-L ; Yang, Y ; Novak, D ; Waterhouse, R (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2010-02-15)
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ItemDesign and Analysis of Digitized RF-Over-Fiber LinksGamage, PA ; Nirmalathas, A ; Lim, C ; Novak, D ; Waterhouse, R (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2009-06-15)
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ItemOptical Tandem Single-Sideband-Based WDM Interface for Millimeter-Wave Fiber-Radio Multisector Antenna Base StationGamage, P ; Nirmalathas, A ; Lim, C ; Novak, D ; Waterhouse, R (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2009-03)