Electrical and Electronic Engineering - Research Publications

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    Compound nanostructure of metallic nanoholes with 1D photonic crystal for multispectral imaging applications
    He, X ; Liu, Y ; Uddin, H ; Nirmalathas, A ; Unnithan, RR (OSA Publishing, 2020)
    This paper demonstrates a single sensor based multispectral spectral imaging camera using a hybrid RGB colour mosaic made of plasmonic and 1D photonic crystal layers.
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    Approaches to improve performance of 60 GHz radio-0verFiber fronthaul links
    Lim, C ; Tian, Y ; Nirmalathas, A ; Lee, KL (OSA Publishing, 2020)
    In this paper, we review the work we have done to improve the performance of users located at the cell boundary of a 60 GHz radio-over-fibre fronthaul using coordinated-multipoint (CoMP) together with non-orthogonal-multiple-access (NOMA).
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    An IoT-owned service for global IoT device discovery, integration and (Re)use
    Dawod, A ; Georgakopoulos, D ; Jayaraman, PP ; Nirmalathas, A (IEEE, 2020)
    This paper introduces a novel IoT-owned service for Global IoT Device Discovery and Integration (GIDDI) of existing IoT devices that are owned and managed by different parties who are the IoT devices providers. The GIDDI service promotes the sharing of existing IoT devices and the deployment of new devices via a revenue generating scheme for the IoT device providers. Unlike existing IoT device discovery and integration solutions that are currently owned and/or controlled by specific IoT platform or service providers, the GIDDI service has been specifically designed to manage all the metadata needed for IoT device discovery and integration in a specialized blockchain (we refer to this as GIDDI Blockchain) and via this blockchain-based solution be IoT-owned (i.e., not owned or controlled by any specific provider). In addition to the GIDDI Blockchain, the GIDDI service includes a distributed GIDDI Marketplace that provides the functionality of IoT device discovery, integration and payment. The paper describes a proof-of-concept implementation of the GIDDI blockchain. It also provides an experimental evaluation of the GIDDI blockchain in variety of IoT device registration and query workloads. An evaluation of the proposed GIDDI service concludes the paper.
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    Multi-Level Code NOMA for Radio-over-Fiber based Fronthaul Links
    Lim, C ; Tao, Y ; Nirmalathas, A (IEEE, 2020)
    The inherent centralized control architecture of radio-over-fiber (RoF) enables advanced coordination functionality to be implemented in a RoF-based mobile fronthaul to facility network management and coordination. This advanced coordination functionality enhances the performance of disadvantaged end users located further away from the remote radio head (RRH) or at the cell edges. In this paper, we review our work incorporating multi-level code based non-orthogonal multiple access (NOMA) to improve the performance of users located further away from the RRH with poor channel gain.
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    A Software-Defined Networking framework for IoT based on 6LoWPAN
    Lasso, FFJ ; Clarke, K ; Nirmalathas, A (IEEE, 2018-01-01)
    The software defined networking framework facilitates flexible and reliable internet of things networks by moving the network intelligence to a centralized location while enabling low power wireless network in the edge. In this paper, we present SD-WSN6Lo, a novel software-defined wireless management solution for 6LoWPAN networks that aims to reduce the management complexity in WSN's. As an example of the technique, a simulation of controlling the power consumption of sensor nodes is presented. The results demonstrate improved energy consumption of approximately 15% on average per node compared to the baseline condition.
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    Aluminum plasmonics in thermal wavelengths for multispectral imaging
    Shaik, NEK ; Weston, L ; Nirmalathas, A ; Unnithan, RR (OSA Publishing House, 2020-01-01)
    Single sensor-based, one-shot multispectral imaging beyond the visible region is rapidly emerging. We present a multispectral filter array in thermal wavelengths using aluminum infrared plasmonics on germanium substrate and illustrate its spectral performance.
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    Novel Spatial Modulation Channel Index Detection in Optical Wireless Communications with Signal Space Diversity
    Song, T ; Wong, E ; Nirmalathas, A ; Alameh, K ; Lim, C ; Wang, K (IEEE, 2020-01-01)
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    Indoor Optical Wireless Communications using Few-mode Based Uniform Beam Shaping and LMS Based Adaptive Equalization
    Li, J ; Lim, C ; Nirmalathas, A (IEEE, 2020-09-01)
    An indoor optical wireless communication system employing few-mode based uniform beam shaping and adaptive LMS equalization is demonstrated. Results show that superior uniformity is obtained and LMS equalization with step size of 0.01 and tap length of 45 achieves the best performance.
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    Demonstration of High-speed Indoor Optical Wireless Communications using Few-mode Based Uniform Beam Shaping
    Li, J ; Lim, C ; Nirmalathas, A ; O'Keefe, N ; Lee, KL (IEEE, 2020-10-04)
    A high-speed indoor optical wireless communications link using few-mode based uniform beam shaping is experimentally demonstrated. Results show that high-quality uniform beam can be realized and the BER performance can be improved significantly by combining the signals from different channels supported by different modes.
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    Gigabit/s Optical Wireless Access and Indoor Networks
    Nirmalathas, TA ; Song, T ; Edirisinghe, S ; Tian, L ; Lim, C ; Wong, E ; Wang, K ; Ranaweera, C ; Alameh, K (OSA - Optical Society of America, 2020)
    Optical wireless networks are being explored as a wireless alternative for provision of multi gigabits/second wireless and this paper presents an overview of recent progress and outstanding challenges. and technologies.