Experimental Implementation of Optical-CDMA for Medical Extra-WBAN Links

Hasan, Jahid; Khalighi, Mohammad-Ali; Bechadergue, Bastien

doi:10.1109/csndsp49049.2020.9249530

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Moreover, billions of internet of things (IoT) and internet of medical things (IoMT) devices share the ISM and licensed ultra wide bands [1,2,3], resulting in spectrum congestion and increased electromagnetic interference (EMI). Therefore, an alternative schemes such as time-division MA (TDMA) and code-division MA (CDMA) have been considered in several multi-user OWC applications, where the requirement of high data-rate is not so stringent [12,13,14,15,16]. However, with the increasing data-rate and the number of users, they suffer from increased implementation complexity due to the multi-user timing synchronization needed in TDMA and longer spreading sequence in CDMA.…”

Section: Introductionmentioning

confidence: 99%

Time Multiplexed Optical-OFDMA for Uplink Transmission in LiFi-based IoT Networks

Hasan,

Haddad,

Ijeh

et al. 2023

AJSE

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The transfer of data from multiple internet of things (IoT) devices requires the use of a robust and efficient multiple access (MA) solution. This paper considers the orthogonal frequency division MA (OFDMA) technique for the light-fidelity (LiFi)-based IoT uplink using infrared to transmit data from multiple mobile users to a fixed access point. The conventional schemes based on orthogonal frequency allocate distinct subcarriers to each user sharing the same time slot. We consider a new approach by allocating distinct time slots to a group of OFDMA users. Taking into account realistic opto-electronic components, we study the performance of the conventional and proposed optical-OFDMA schemes. We show that asymmetrically clipped optical-OFDMA signaling scheme outperforms direct current biased signaling in terms of electrical power efficiency. Focusing on the asymmetrically clipped signaling, We demonstrate the robustness of our proposed time multiplexed optical-OFDMA scheme against MA interference caused by signal clipping. We also show the advantages of our scheme in reducing computational complexity by a factor of 2 compared to the conventional optical-OFDMA schemes.

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Section: Introductionmentioning

confidence: 99%

Time Multiplexed Optical-OFDMA for Uplink Transmission in LiFi-based IoT Networks

Hasan,

Haddad,

Ijeh

et al. 2023

AJSE

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Impact of Synchronization Errors on the Performance of ACO-OFDMA Signaling for Medical Extra-WBAN Links

Hasan

Khalighi

Alves

et al. 2021

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

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This paper considers the use of infrared-based optical wireless communications for multi-user uplink wireless body-area networks. We propose the use of optical-orthogonal frequency division multiple access (O-OFDMA) signaling to manage the multiple access (MA) requirement for relatively high-rate medical applications. In particular, we consider asymmetrically clipped O-OFDMA and analyze its performance in terms of bit-errorrate and outage probability in the presence of multi-user time synchronization errors. These latter may occur due to mobility and random transmitter orientations, and will impact the link performance by inducing MA interference (MAI). We show that the effect of MAI increases with increasing the data rate. For instance, for 1 and 2 Mbps data rates, to achieve a target biterror-rate of 10 −3 , the link distance is limited to 1.9 and 1 m, respectively, compared to 2.2 and 1.8 m in the absence of MAI.

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An Energy-Efficient Optical Wireless OFDMA Scheme for Medical Body-Area Networks

Hasan

Khalighi

Jungnickel

et al. 2022

IEEE Trans. on Green Commun. Netw.

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The transfer of health monitoring data from multiple patients using wireless body-area networks requires the use of robust, and energy and bandwidth efficient multipleaccess 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 35 mW less transmit power is needed to achieve a bit error rate of 10 -3 in the considered scenario. We also demonstrate the robustness of the proposed scheme against multiple access interference.

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Experimental Implementation of Optical-CDMA for Medical Extra-WBAN Links

Cited by 3 publications

References 30 publications

Time Multiplexed Optical-OFDMA for Uplink Transmission in LiFi-based IoT Networks

Time Multiplexed Optical-OFDMA for Uplink Transmission in LiFi-based IoT Networks

Impact of Synchronization Errors on the Performance of ACO-OFDMA Signaling for Medical Extra-WBAN Links

An Energy-Efficient Optical Wireless OFDMA Scheme for Medical Body-Area Networks

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