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• W4220889101 abstract "The transfer of health monitoring data from multiple patients using wireless body-area networks requires the use of robust, and energy and bandwidth efficient multiple-access schemes. This paper considers the frequency-division multiple access for the wireless uplink to a fixed access point when using infrared signals to collect medical data from several patients inside an emergency waiting room. The conventional optical orthogonal scheme applies Hermitian symmetry to obtain real-valued signals, which implies increased computational complexity. We consider a new approach transmitting only the real part of a complex-valued signal, where no such constraint is imposed. Based on the proposed scheme, and taking into account the limited dynamic range of an infrared light-emitting diode, we study the performance of direct current biased and asymmetrically clipped schemes, and show their advantage in terms of energy efficiency and computational complexity, as compared with the conventional schemes. For instance, we show that by using asymmetric clipping, around 35mW less transmit power is needed to achieve a bit error rate of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$mathrm {10}^{-3}$ </tex-math></inline-formula> in the considered scenario. We also demonstrate the robustness of the proposed scheme against multiple access interference." @default.
• W4220889101 created "2022-04-03" @default.
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• W4220889101 date "2022-09-01" @default.
• W4220889101 modified "2023-10-11" @default.
• W4220889101 title "An Energy-Efficient Optical Wireless OFDMA Scheme for Medical Body-Area Networks" @default.
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• W4220889101 doi "https://doi.org/10.1109/tgcn.2022.3161413" @default.
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