Enhanced Optical OFDM: A novel approach for SISO and MIMO Visible Light Communication system in indoor environment

Deepthi, S. Aruna; Visalakshi, P.

doi:10.1007/s11082-021-03172-8

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…In Liu et al (2019), Barrami et al (2014) a co-operative NOMA-based DCO-OFDM VLC system is analysed with DCO OFDM. In Deepthi and Visalakshi (2021) proposed optical OFDM method for high data rate including MIMO OFDM, but this method is limited for NLOS VLC. Based on the above limitations, this work proposes an ACO-OFDM NOMA for LOS and Non-LOS channel condition in a multi-user environment.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of ACO-OFDM NOMA for VLC communication

et al. 2022

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Visible light communication (VLC) is seeking a lot of attention in the recent years due to high bandwidth, low cost, ease of implementation. VLC can be used for illumination as well as communication at the same time. Light emitting diode (LED) acts as a transmitter for data transmission and photo detector is used at the receiver side. Intensity Modulation (IM) is used to convert electrical signal into optical signal where only real and positive signal need to be transmitted. Optical orthogonal frequency division multiplexing (O-OFDM) is used in the VLC to enhance the bandwidth limitation due to LED. Using OOFDM for VLC does not provide the massive connectivity in an multi-user environment. A Non orthogonal multiple access (NOMA) is the further expansion where user can use both the time and frequency resources but distinguished in power domain with successive interference cancellation (SIC) at the receiver to decode the signal of each user. Also, Asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) is used to get positive signal with enhanced spectral efficiency. The proposed method is evaluated analytically and using simulation in terms of bit error rate (BER).

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Section: Introductionmentioning

confidence: 99%

Performance analysis of ACO-OFDM NOMA for VLC communication

et al. 2022

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“…The MISO system can increase the channel capacity without consuming extra bandwidth and SNR. The high-order MISO is commonly applied in VLC system and for further exploiting of the multipath channel capacity [3][4][5]. However, increasing the number of light-emitting diode (LED) and other hardware of the transmitter in a limited space is also a challenge.…”

Section: Introductionmentioning

confidence: 99%

Capacity Optimization of MISO System in Intercell Interference of Visible Light Communication System

Ali

Abdelgader

Farhi

et al. 2022

Wireless Communications and Mobile Computing

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The capacity of multiple input and single out (MISO) system is investigated in intercell interference environment of a visible light communication (VLC) system. The interference is dominating in cell edges and the center of the room due to overlapping of light signals from neighbor cell. The footprint of one cell extends at high SNR, and consequently, this increases the intercell interference regions. Therefore, the channel capacity is greatly deteriorated due to interference power. In this paper, the channel capacity can be improved using diversity gain of MISO-based VLC system. The light-emitting diode (LEDs) of MISO system in a cell can use the same data to improve the diversity gain of the system. The MISO array is derived as per SNR requirements in interference region of the room. The capacity of the MISO system is examined and compared with that of the single input and single output (SISO). A trade-off of the MISO array is obtained at different SNRs to achieve the interference free capacity system. Theoretical and simulation capacity response show that the interference is considerably minimized by using diversity gain of MISO system. The interference free capacity is achieved at 44 dB, 49.5 dB, and 51.7 dB SNR using 4X1, 9X1 and 16X MISO system, respectively.

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