Massive MIMO For Indoor VLC Systems

Younus, Safwan Hafeedh; Al‐Hameed, Aubida A.; Alhartomi, Mohammed A.; Hussein, Ahmed Taha

doi:10.1109/icton51198.2020.9203471

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…The sum rate maximization was derived by power-domain superposition coding and the corresponding optimal power allocation strategy for each user pair. In [ 61 ], single-user and multi-user VLC was studied in an indoor environment. For the demodulation of data in single-user, maximum ratio combining (MRC) was used, and for multi-user spatial multiplexing, MRC and transmitter/receiver diversity were used.…”

Section: Mimo Communication Study Categoriesmentioning

confidence: 99%

A Comprehensive Survey on MIMO Visible Light Communication: Current Research, Machine Learning and Future Trends

Sejan

Rahman

Aziz

et al. 2023

Sensors

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Visible light communication (VLC) has contributed new unused spectrum in addition to the traditional radio frequency communication and can play a significant role in wireless communication. The adaptation of VLC technology enhances wireless connectivity both in indoor and outdoor environments. Multiple-input multiple-output (MIMO) communication has been an efficient technique for increasing wireless communications system capacity and performance. With the advantages of MIMO techniques, VLC can achieve an additional degree of freedom. In this paper, we systematically perform a survey of the existing work based on MIMO VLC. We categorize the types of different MIMO techniques, and a brief description is given. Different problem-solving approaches are given in the subsequent sections. In addition, machine learning approaches are also discussed in sufficient detail. Finally, we identify the future study direction for MIMO-based communication in VLC.

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Section: Mimo Communication Study Categoriesmentioning

confidence: 99%

A Comprehensive Survey on MIMO Visible Light Communication: Current Research, Machine Learning and Future Trends

Sejan

Rahman

Aziz

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…Furthermore, the paradigm of mMIMO has been explored in VLC systems recently by incorporating several LED arrays and PD arrays [22], [27]. Hence, optical OFDM can be extended to mMIMO VLC systems to further enhance the achievable rate [23] by mitigating ISI. However, indoor VLC channels are typically highly correlated since there is no phase information.…”

Section: Introductionmentioning

confidence: 99%

Multiuser Massive MIMO-OFDM for Visible Light Communication Systems

2023

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Visible light communication (VLC) has emerged as a viable supplement to existing radio frequency (RF) communication systems. The limited modulation bandwidth of sources is one of the significant challenges in the multiuser (MU) VLC systems, which prohibits transmission at high data rates for each user. Since an array of LEDs is used to illuminate a room, a MU VLC system utilizing massive multiple-input multiple-output (mMIMO) orthogonal frequency-division multiplexing (OFDM) is proposed for achieving high data rates in this paper. Since the distances of the multiple transmitter-receiver links are different, their temporal delays are also different, resulting in complex channel gain and phase differences when transformed to the frequency domain in the OFDM technique. Complex channel vectors associated with different users are mutually spatially orthogonal as the number of transmitters increases. Therefore, inter-user interference (IUI) can be eliminated with simple linear signal processing, and more users can simultaneously communicate in the same time-frequency resource. In this paper, three linear precoding methods, including the maximum ratio transmission (MRT), the minimum mean square error (MMSE), and the zero-forcing (ZF), are investigated for VLC systems based on proposed MU-mMIMO-OFDM in intensity-modulation and direct-detection link. We evaluate and compare the performance of the aforementioned precoding methods in terms of the achievable spectral efficiency and total downlink optical power for different scenarios. Moreover, we derive a closed-form expression for the lower bound on the average achievable sum-rate, which we confirm the accuracy of the derived expression with the numerical simulation. The results demonstrate that the performance of the proposed method in this paper for all precoder techniques, i.e., ZF, MMSE, and MRT, is better than the previous works since the complex channel in the frequency domain is used in this paper. Furthermore, the ZF and MMSE methods are better than MRT when the ratio of the number of LEDs to the number of users is large. At the same time, when this ratio is relatively small, the MRT precoding technique outperforms the ZF and MMSE techniques.

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