Spectral and Energy Efficiency of ACO-OFDM in Visible Light Communication Systems

Ma, Shuai; Yang, Ruixin; Deng, Xiong; Ling, Xintong; Zhang, Xun; Zhou, Fuhui; Li, Shiyin; Ng, Derrick Wing Kwan

doi:10.1109/twc.2021.3109735

Cited by 14 publications

(5 citation statements)

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“…The Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO-OFDM) technique is implemented in the VLC network to enhance spectral efficiency and energy efficiency. The performance is improved by the optimal power allocation such that the minimum mean squared error is maintained [61]. Further, phase multi-band Carrierless AmPlitude (m-CAP) modulation integrated with the parameter of received strength of the signal has been performed to obtain visible light communication and sensing corresponding to the same signal [62].…”

Section: A Related Workmentioning

confidence: 99%

6G: Technology Evolution in Future Wireless Networks

Shafi,

Jha,

Jain

2024

IEEE Access

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The Sixth Generation (6G) Wireless Communication Network (WCN) is the successive provision to ameliorate the gain with ultra-low latency, and e xtremely high energy efficiency. The 6G WCN enables the specifications of artificial intelligence to optimize the services and capabilities. The vision of the 6G era is expected to address a seamless fusion of communication between the human, physical world, and digital world. The latest 6G WCN standard is a fundamental foundation and requires immense attention in the field of research. This paper presents the framework of 6G WCN with an illustration of its key technologies. The different technologies involved in 6G are well explained with the demonstration of the communication scenario such that the key performance indicators are improved with major differences. The primary contribution of this paper is the explanation of the 6G with the technologies that have a drastic impact on the characteristic aspects of a wireless communication network such as data rate, spectrum efficiency, energy efficiency, connection density, and reliability. All these technologies have the capability to revolutionize the subsequent WCN.

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Section: A Related Workmentioning

confidence: 99%

6G: Technology Evolution in Future Wireless Networks

Shafi,

Jha,

Jain

2024

IEEE Access

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“…The orthogonal frequency division multiplexing (OFDM) technology is widely studied and applied and has the benefits of high-frequency utilization and strong resistance to multipath interference. In order to satisfy the requirement of non-negative real signals and improve the power efficiency of the system at the same time in the situation of introducing OFDM into visible optical communication, researchers came up with a single-polarity real-valued scheme called the ACO-OFDM technique [15].…”

Section: The Technology Of Aco-ofdmmentioning

confidence: 99%

Heterogeneous Network Switching Strategy Based on Communication Blind Area Dwell Time

Zhang

Tang

Wang

et al. 2023

Sensors

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The limitation of indoor visible light coverage and the attenuation of its signal when propagating in line-of-sight has seriously affected the stable communication of receiving devices when users move randomly and also aggravated the power consumption of visible light networking systems. According to the above situation, on the basis of the heterogeneous networking of visible light communication (VLC) and RF communication integration, this article proposes a horizontal–vertical collaborative handover strategy based on the communication blind area dwell time (CBD-HVHO). Combining asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) technology with networking handover technology, ACO-OFDM is used to determine the indoor communication blind area by calculating the bit error rate (BER) value at the signal receiver while reducing the multipath interference generated by visible light signals during channel transmission. To achieve this, set the communication blind channel interruption time as the threshold time, compare the communication blind area dwell time with the threshold time, and finally combine the horizontal and vertical collaborative handover strategies based on the communication blind area dwell time. The simulation results show that the handover probability is 0.009, the average number of handovers is 1.006, and the average network throughput is 195.2826 Mbps. Compared with the previously proposed immediate vertical handover (I-VHO) scheme and the dwell vertical handover (D-VHO) scheme, the communication stability is significantly improved, and the power consumption of the network system is reduced to a certain extent.

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“…To improve power efficiency, asymmetrically clipped Optical OFDM (ACO-OFDM) was proposed, a solution in which the negative part of the signal was directly clipped to obtain a non-negative signal but this method would induce suboptimal spectral efficiency [3]. In recent years, superimposed OFDM schemes have emerged to increase power efficiency, such as hybrid ACO-OFDM (HACO-OFDM) [4] and layered ACO-OFDM (LACO-OFDM) [5].…”

Section: Introductionmentioning

confidence: 99%

An Adaptively Biased OFDM Based on Hartley Transform for Visible Light Communication Systems

WU,

XIE,

SHI

et al. 2024

IEICE Trans. Fundamentals

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Direct-current biased optical orthogonal frequency division multiplexing (DCO-OFDM) converts bipolar OFDM signals into unipolar non-negative signals by introducing a high DC bias, which satisfies the requirement that the signal transmitted by intensity modulated/direct detection (IM/DD) must be positive. However, the high DC bias results in low power efficiency of DCO-OFDM. An adaptively biased optical OFDM was proposed, which could be designed with different biases according to the signal amplitude to improve power efficiency in this letter. The adaptive bias does not need to be taken off deliberately at the receiver, and the interference caused by the adaptive bias will only be placed on the reserved subcarriers, which will not affect the effective information. Moreover, the proposed OFDM uses Hartley transform instead of Fourier transform used in conventional optical OFDM, which makes this OFDM have low computational complexity and high spectral efficiency. The simulation results show that the normalized optical bit energy to noise power ratio ( ( ) / 0 ) required by the proposed OFDM at the bit error rate (BER) of 10 −3 is, on average, 7.5 dB and 3.4 dB lower than that of DCO-OFDM and superimposed asymmetrically clipped optical OFDM (ACO-OFDM), respectively.

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Spectral and Energy Efficiency of ACO-OFDM in Visible Light Communication Systems

Cited by 14 publications

References 50 publications

6G: Technology Evolution in Future Wireless Networks

6G: Technology Evolution in Future Wireless Networks

Heterogeneous Network Switching Strategy Based on Communication Blind Area Dwell Time

An Adaptively Biased OFDM Based on Hartley Transform for Visible Light Communication Systems

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