Impact of clipping noise on the sum rate of NOMA with PD-DCO-OFDM and conventional DCO-OFDM

Gebeyehu, Zelalem Hailu

doi:10.1016/j.heliyon.2020.e03363

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…Furthermore, their experimental results showed the superior BER performance of the HPD-LACO-OFDM-based PD-NOMA-VLC network with three layers over the traditional DCO-OFDM. The authors in [ 74 ] investigated the impact of the clipping noise of polarity divided DCO-OFDM (PD-DCO-OFDM) and DCO-OFDM-based PD-NOMA-VLC system, on the achievable sum rate. Their simulation results showed that PD-DCO-OFDM can offer a better achievable sum rate compared to DCO-OFDM for the two-user scenario.…”

Section: Challenges In Pd-noma Vlcmentioning

confidence: 99%

A Survey of NOMA for VLC Systems: Research Challenges and Future Trends

Sadat

Abaza

Mansour

et al. 2022

Sensors

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Visible light communication (VLC) has become a promising technology for high data rate communications and an attractive complementary to conventional radio frequency (RF) communication. VLC is a secure, energy efficient and cost-effective technology that exploits the existing infrastructure, particularly in indoor environments, for wireless data transmission. Nevertheless, the main limitation of developing high data rate VLC links is the narrow modulation bandwidth of light-emitting diodes (LEDs), which is in the megahertz range. The power domain nonorthogonal multiple access (PD-NOMA) scheme is envisioned to address several challenges in VLC systems. In this paper, we present a detailed overview of PD-NOMA based VLC systems. Moreover, we introduce insights on some PD-NOMA VLC system constraints and challenges such as power allocation, clipping effect, MIMO and security. Finally, we provide open research problems as well as possible directions for future research to pave the way for the implementation of PD-NOMA VLC systems.

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Section: Challenges In Pd-noma Vlcmentioning

confidence: 99%

A Survey of NOMA for VLC Systems: Research Challenges and Future Trends

Sadat

Abaza

Mansour

et al. 2022

Sensors

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“…Both the polynomial model and the RHI term are insufficient to investigate the effect of the nonlinear HPA on the performance of the OFDM-NOMA system. In contrast, the authors of [8,12,13] used the Bussgang theorem to model HPA. This is a practical HPA model for investigating the impact of IBO on the performance of the OFDM-NOMA system.…”

Section: Introductionmentioning

confidence: 99%

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Mounir

Youssef

Aboshosha

2023

EURASIP J. Adv. Signal Process.

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To support ultra-massive connectivity, non-orthogonal multiple access (NOMA) techniques are expected to be used in 6G instead of conventional orthogonal multiple access (OMA) techniques. Furthermore, given that orthogonal frequency division multiplexing (OFDM) was used by 4G and 5G, NOMA is expected to be combined with OFDM to mitigate frequency selectivity in multipath channels. However, after passing through nonlinear high power amplifiers (HPAs), OFDM-NOMA has reportedly suffered from nonlinear distortion due to the high peak-to-average power ratio (PAPR) problem, thus reducing users’ achievable data rates, sum rate capacity, and users’ bit error rate after going through nonlinear HPAs. Many PAPR reduction techniques have been introduced in the literature; however, high PAPR reduction gain comes at the expense of computational complexity. In this paper, a novel selective mapping (SLM) scheme for PAPR reduction in OFDM-NOMA systems is proposed. By utilizing the structure of the OFDM-NOMA transmitter, the proposed SLM scheme achieves the same performance as that of the conventional SLM scheme while requiring less computational complexity.

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“…Orthogonal frequency division multiplexing (OFDM) is the well accepted multicarrier technique in the past two decades primarily because of its easy implementation at transmitter and receiver [1]. OFDM uses digital signal processing chips with inverse fast Fourier transform (IFFT) algorithm for packing multiple scrupulously placed orthogonal carriers with intersecting spectrum at its transmitter [2]. This idea has successfully replaced the complex idea of using a bank of modulators for multi carrier signal generation in conventional systems [3].…”

Section: Introductionmentioning

confidence: 99%

Implementation of filtered preamble GFDM system using USRP

Mangi¹,

Kavipriya

2022

Preprint

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Data rate performance of the modern multicarrier techniques like generalized frequency division multiplexing (GFDM) has been significantlly limited by vital impairments like symbol time offset (STO) and carrier frequency offset (CFO). Traditional data aided methods of synchronization avoid the effect of egress noise in pilot preamble and hence destroying the spectral advantage of GFDM system. To safeguard this advantage, preamble needs to be pulse shaped. The main contribution of this paper is the derivation of generalized maximum likelihood (ML) estimation of frequency and time offsets for receiver synchronization in GFDM systems, using the modified preamble by the application of matrix inversion lemma. The dependency of the choice of the filter on Cramer-Rao lower bound (CRLB) of frequency offset estimation is also emphasized. The performance of the system is analysed over additive white Gaussian noise (AWGN) and multipath channel environments. The authors carried out real time implementation of GFDM system using IEEE 802.11 short preamble in indoor environments by employing national instruments (NI) universal software radio peripheral (USRP) 2953R boards as hardware platform which is interfaced with LABVIEW for practical validations of the results.

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Impact of clipping noise on the sum rate of NOMA with PD-DCO-OFDM and conventional DCO-OFDM

Cited by 10 publications

References 23 publications

A Survey of NOMA for VLC Systems: Research Challenges and Future Trends

A Survey of NOMA for VLC Systems: Research Challenges and Future Trends

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

Implementation of filtered preamble GFDM system using USRP

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