Optical OFDM for visible light communications

Hanzo, Lajos; Mao, Tianqi; Wang, Qi

doi:10.1109/iwcmc.2017.7986454

Cited by 40 publications

(32 citation statements)

References 27 publications

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“…A pilot stream is used with a length equal to 1/Nt × L where L represents frame length. The channel estimation matrix for 2×2 MIMO is considered according to (9). In the first step, Tx number one sends the pilot stream, while other Tx's do not send data.…”

Section: Bmentioning

confidence: 99%

“…Different OFDM schemes have been proposed and fully investigated including asymmetrically clipped optical (ACO-) OFDM and DCbiased OFDM [1,[4][5]. Nonetheless, the OFDM-based VLC, where different subcarriers are summed up, suffers from a high peak-to-average power ratio (PAPR) due to the limited linearity and dynamic range of the LED power-current characteristic [1,[3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of a MIMO VLC System Employing Single Carrier Modulation with Frequency Domain Equalization

Ganjian

Baghersalimi

Ghassemlooy

2020

2020 3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communication (WASOWC)

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Section: Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of a MIMO VLC System Employing Single Carrier Modulation with Frequency Domain Equalization

Ganjian

Baghersalimi

Ghassemlooy

2020

2020 3rd West Asian Symposium on Optical and Millimeter-Wave Wireless Communication (WASOWC)

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“…Since OFDM is a complex bipolar signal, it is modified to meet the requirement of IM/DD VLC systems where the signal must be real and unipolar. Thus, both DCO-OFDM and ACO-OFDM are proposed as the modified version of optical OFDM [9]. In DCO-OFDM, a DC bias is added and hard clipping is performed whereas in ACO-OFDM only the odd subcarriers are utilized to convey the information and clipping is applied to make the OFDM signal positive.…”

Section: System Modelmentioning

confidence: 99%

An Adaptive Turbo Coded-OFDM Scheme for Visible Light Communications

Ataee

Sadough

Ghassemlooy

2019

2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)

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In visible light communications (VLC) the main bottleneck is the limited bandwidth of the light emitting diodes, which limits the maximum transmission data rates. Multicarrier modulation schemes are one possible option to increase the data rate as well as improve the link performance. In this paper, we present the turbo coded orthogonal frequency-division multiplexing (OFDM) scheme to mitigate interference and noise as well as to remove multipath induced inter symbol interference in a VLC system. Simulation results are used to compare the performance of the proposed system compared to classical optical OFDM schemes of DC-biased optical and asymmetrically clipped optical-OFDM. The results presented may be used to investigate the interaction between VLC system parameters (e.g., receiver field-of-view limitation, incident angle, light emitting diode power) and the bit error rate performance of the soft turbo decoder.

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“…The VLC uses the Light Emitting Diode (LED) as a light source, satisfying both communication and illuminations simultaneously [5]. Orthogonal Frequency Division Multiplexing (OFDM) has been commonly used in VLC systems in recent years [8]- [10], due to its high spectral efficiency and the Intersymbol Interference (ISI) resistance. The OFDM symbols can be represented as intensity for optical wireless communication, which means the modulated signals are both real and positive; however, the baseband OFDM signals usually are complex and bipolar [11].…”

Section: -Introductionmentioning

confidence: 99%