Electrical and Electronic Engineering - Research Publications

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    High Reliability Radar and Communications Based on Random Stepped Frequency Waveforms
    Dayarathna, S ; Senanayake, R ; Evans, J ; Smith, P (IEEE, 2023)
    This paper is on the waveform design of joint radar and communication systems. Focusing on permutation code based random stepped frequency waveforms, we present a new joint radar and communication system that has improved communication error rate performance when compared to existing approaches. More specifically, we propose a subset selection process to improve the Hamming distance between communication waveforms. An efficient encoding scheme is proposed to map the information symbols to selected permutations. Further, an optimal communication receiver based on integer programming followed by a more efficient sub-optimal receiver based on the Hungarian algorithm is also proposed. Considering the optimum maximum likelihood detection, the block error probability is analyzed under both additive white Gaussian noise channels and Rician fading channels. Finally, we discuss the radar performance under the new system and highlight that it has negligible effect on the radar local and global accuracy.
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    Differential MPSK with n-Bit Phase Quantization
    Gayan, S ; Inaltekin, H ; Senanayake, R ; Evans, J (IEEE, 2023-01-01)
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    Joint Relay Selection and Power Control to Maximize Sum-Rate in Multi-Hop Networks
    Dayarathna, S ; Senanayake, R ; Evans, J (IEEE, 2023-01-01)
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    CFMA for Gaussian MIMO Multiple Access Channels
    Zhang, L ; Evans, J ; Zhu, J (IEEE, 2023-01-01)
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    Hardware-Limited Non-Uniform Task-Based Quantizers
    Bernardo, NI ; Zhu, J ; Eldar, YC ; Evans, J (IEEE, 2023-01-01)
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    Flex-Net: A Graph Neural Network Approach to Resource Management in Flexible Duplex Networks
    Perera, T ; Atapattu, S ; Fang, Y ; Dharmawansa, P ; Evans, J (IEEE, 2023)
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    Maximizing Sum-Rate via Relay Selection and Power Control in Dual-Hop Networks
    Dayarathna, S ; Senanayake, R ; Evans, J (IEEE, 2022)
    In this paper, we focus on the sum-rate optimization problem in a general dual-hop relay network by considering the joint relay selection and power control in the presence of interference. First, we propose a new relay selection algorithm which has better sum-rate performance than the existing relay selection techniques. Then we combine relay selection and power control to propose a novel iterative algorithm based on the tight lower bound approximation which maximizes the achievable sum-rate. We also prove that for the special case of two-user networks, binary power allocation is optimum for at least two transmitting nodes. Extensive numerical examples are used to compare the performance of the proposed algorithm and to illustrate the accuracy of the analysis.
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    Chemical Reactions-based Detection Mechanism for Molecular Communications
    Cao, TN ; Jamali, V ; Wicke, W ; Yeoh, PL ; Zlatanov, N ; Evans, J ; Schober, R (IEEE, 2020-05)
    In molecular communications, the direct detection of signaling molecules may be challenging due to the lack of suitable sensors and interference from co-existing substances in the environment. Motivated by examples in nature, we investigate an indirect detection mechanism using chemical reactions between the signaling molecules and a molecular probe to produce an easy-to-measure product at the receiver. The underlying reaction-diffusion equations that describe the concentrations of the reactant and product molecules in the system are non-linear and coupled, and cannot be solved in closed-form. To analyze these molecule concentrations, we develop an efficient iterative algorithm by discretizing the time variable and solving for the space variables in each time step. We also derive insightful closed-form solutions for a special case. The accuracy of the proposed algorithm is verified by particle-based simulations. Our results show that the concentration of the product molecules has a similar characteristic over time as the concentration of the signaling molecules. We analyze the bit error rate (BER) for a threshold detector and highlight that significant improvements in the BER can be achieved by carefully choosing the molecular probe and optimizing the detection threshold.