Experimental Demonstration of OFDM Based WDM-MIMO Visible Light Communication System

Omura, Nariisa; Higashi, Akinori; Yabuuchi, Jun; Iwamatsu, Takanori; Oshiba, Saeko

doi:10.23919/apmc.2018.8617505

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…From Fig. 7, signal separation using neural networks can separate signals with the same accuracy as the pilotbased method [13], [17]. The CNR when the BER was 3.8 × 10 −3 (FEC limit) was improved by 2 dB for NET-SIC compared to NET-ZF.…”

Section: Simulation Resultsmentioning

confidence: 95%

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MIMO Systems with Neural Networks in OFDM-Based WDM Visible Light Communications

Umezawa

Oshiba

2023

IEICE Trans. Electron.

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In this paper, we describe a wavelength-division multiplexing visible-light communication (VLC) system using two colored light-emitting diodes (LEDs) with similar emission wavelengths. A multiinput multi-output signal-separation method using a neural network is proposed to cancel the optical cross chatter caused by the spectral overlap of LEDs. The experimental results demonstrate that signal separation using neural networks can be achieved in wavelength-multiplexed VLC systems with a bit error rate of less than 3.8 × 10 −3 (forward error correction limit). Furthermore, the simulation results reveal that the carrier-to-noise ratio (CNR) is improved by 2 dB for the successive interference canceller (SIC) compared to the zero-forcing method.

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Section: Simulation Resultsmentioning

confidence: 95%

“…Signal separation can be achieved using multi-input multi-output (MIMO) technology, which integrates the LED frequency characteristics and PDs [10]- [12]. We previously demonstrated that signal sep-aration can be achieved using optical filters and MIMO technology, even when the emission wavelengths of the LEDs are close together [13].…”

Section: Introductionmentioning

confidence: 99%

MIMO Systems with Neural Networks in OFDM-Based WDM Visible Light Communications

Umezawa

Oshiba

2023

IEICE Trans. Electron.

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“…Data rates > 1 Gb/s over a transmission distance of 1 m using four channels, and 7.48 Gb/s over 0.5 m using nine channels via individually addressable micro LED (µLED) arrays, as reported in [5]. In [13][14][15][16], the combination of WDM and MIMO were employed to improve both the aggregated data rate (6.36 Gb/s) and reliability of the VLC. In [13], a hybrid WDM-MIMO successive interference cancelation algorithm was used to further reduce the interference between channels.…”

Section: Introductionmentioning

confidence: 99%

Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

et al. 2021

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This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on a defocused non-imaging multiple-input multiple-output (MIMO), which removes the need for tuned optical bandpass filters paired with each receiver. The proposed system is based on using the natural diversity of the individual light emitting diodes (LEDs) within a single light source to generate an H-matrix, which is independent of spatial diversity. We show that, by transmitting K-independent sets of non-return to zero on-and-off keying signals on separate wavelengths, the received superposed symbols can be demultiplexed. The non-imaging MIMO diversity is achieved by considering the power-current characteristics of the light emitting diode, the responsivity of the photodetector array, and the defocused beam spot. The system is empirically verified for K = 3 using red, green, and blue LEDs with Q-factors of 7.66, 7.69, and 4.75 dB, respectively.

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“…CI, which eliminates the interference by directly forcing the interference terms to be zeros, has been investigated within the context of VLC for interference cancellation under the name of zero forcing (ZF) in multi-colour based MIMO and multipleinput single-output (MISO) links [6]. In [15], the performance of CI was compared with a combination of CI and successive interference cancellation (SIC) for a 3 × 3 MIMO wavelength division multiplexing (WDM) VLC system. It was shown that, for the optical band-pass filter and for signals having the same full width half maximum, the bit error rate (BER) performance of CI with SIC was half that of CI without SIC.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of CI was theoretically investigated in [17] for MIMO carrier-less amplitude and phase (CAP) Rxs in VLC showing an improvement in signal-to-noise ratio (SNR) by ∼ 3 dB for a BER of 3.8 × 10 −3 by combining it with optimally-ordered SIC (OSIC) at a cost of increased complexity. However, in [15][16][17], the performance of CI in a NLOS link or a nonlinear VLC system is not investigated. For a multiuser MISO downlink VLC system such as in airplane cabins, CI was adopted in [18] showing that an average per-user rate of ∼ 0.3 bps/Hz lower than Tomlinson-Harashima precoding scheme at 20 o degrees of LED directivity in a dynamic scenario.…”

Section: Introductionmentioning

confidence: 99%

Interference cancellation in MIMO NLOS optical-camera-communication-based intelligent transport systems

et al. 2019

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The ever-increasing number of vehicles at a global level signifies the need for communications between vehicles and the surrounding environment. Visible light communications (VLC) is a viable complementary technology to the congested radio frequency-based wireless systems. In order to increase the reliability of the VLC link, in this paper we propose two novel algorithms based on (i) channel inversion (CI), and (ii) frame subtraction and CI (FSCI) schemes are proposed to successfully extract the data in a non-line-ofsight multiple-input multiple-output spatial division multiplexing optical camera communications system. We have adopted differential modulation and frame subtraction schemes and proposed a unique packet structure to mark the packet and the position of the footprint of transmitters (Txs) in the image frame. We show that, the FSCI scheme with much simpler receiver structures can offer almost the same bit error rate (BER) performance compared with the hybrid selection/equal gain combining (HS/EGC) technique at lower transmit power (illumination) levels of < 13 dBm for a single transmitter(Tx) and improved performance at higher illumination levels of > 20 dBm for multiple Txs. Compared with HS/EGC, CI schemes have a higher tolerance to the spacing between Txs, where the payload threshold level can be set to a fixed value of 0.5.

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Experimental Demonstration of OFDM Based WDM-MIMO Visible Light Communication System

Cited by 8 publications

References 2 publications

MIMO Systems with Neural Networks in OFDM-Based WDM Visible Light Communications

MIMO Systems with Neural Networks in OFDM-Based WDM Visible Light Communications

Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

Interference cancellation in MIMO NLOS optical-camera-communication-based intelligent transport systems

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