• Title/Summary/Keyword: surface improvement

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An Analytical Expression for BER Performance of Intelligent Reflecting Surface Assisted NOMA

  • Chung, Kyuhyuk
    • International Journal of Internet, Broadcasting and Communication
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    • v.14 no.2
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    • pp.23-29
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    • 2022

  • To improve spectrum and energy efficiency in the fifth generation (5G) wireless channels, intelligent reflecting surface (IRS) transmissions have been envisioned, possibly towards the sixth generation (6G) networks. In this paper, we analyze the bit-error rate (BER) performance of intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) systems. First, we derive a closed-form expression of the BER in terms of Q functions. Then we analyze the BER improvement of the IRS NOMA system over the conventional NOMA system with respect to the power allocation. Furthermore, we also demonstrate numerically the BER improvement of the IRS NOMA network over the conventional NOMA network in respect of the number of reflecting devices.

  • https://doi.org/10.7236/IJIBC.2022.14.2.23 인용 PDF KSCI

BER Performance Analysis of Intelligent Reflecting Surface NOMA for Strongest Channel Gain User

  • Kyuhyuk, Chung
    • International Journal of Internet, Broadcasting and Communication
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    • v.15 no.4
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    • pp.84-89
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    • 2023

  • Recently, the sixth generation (6G) networks have become tremendous research topics. Intelligent reflecting surface (IRS) technologies have been envisioned, to increase spectrum and energy efficiency for the fifth generation (5G) mobile networks, towards the sixth generation (6G) communications. In this paper, especially for the strongest channel gain user, we investigate the bit-error rate (BER) of non-orthogonal multiple access (NOMA) systems with intelligent reflecting surface (IRS). First, we derive a BER expression in a closed-form of Q functions. Second, we investigate the BER performance improvement of IRS NOMA systems over NOMA systems versus the power allocation. Moreover, we analyze the BER performance improvement of IRS NOMA systems over NOMA systems versus the number of IRS devices. In results, NOMA equipped with IRS technologies could play an important role in the paradigm shift from 5G mobile networks to 6G mobile networks.

  • https://doi.org/10.7236/IJIBC.2023.15.4.84 인용 PDF

Improvement of SiO$_2$Etching Characteristics by E-ICP (SiO$_2$식각 특성 개선을 위한 E-ICP와 ICP 식각 비교)

  • 정재성;김진우;라상호;오범환;박세근
    • Proceedings of the IEEK Conference
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    • 1999.11a
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    • pp.887-890
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    • 1999

  • The etch characteristics of E-ICP and ICP are compared for the improvement of SiO$_2$ etch Process. Etch rate and etch pattern profile are measured by $\alpha$ -step surface profiler and SEM, respectively. The E-ICP provides improved characteristics on etch rate and surface profile in comparison to ICP process.

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