BER analysis of dynamic FOV based MIMO-NOMA-VLC system

Dixit, Vipul; Kumar, Atul

doi:10.1016/j.aeue.2021.153989

Cited by 16 publications

(2 citation statements)

References 18 publications

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“…In optical communication systems, it has been aimed to investigate the performance of PPM schemes on several channel conditions, including Additive White Gaussian Noise (AWGN) [8], gamma channel [9], and infrared channels [10]. In addition to this, the PPM schemes have been considered for multiple access techniques to observe its BER performance in VLC systems with multiple users [11]. To provide energy saving, the PPM schemes have recently been modified by using pulse width modulation (PWM) that aids in adjusting the Light Emitted Diode (LED) dimming level.…”

Section: Introductionmentioning

confidence: 99%

The modulation classification methods in PPM–VLC systems

Ağır

Sönmez

2023

Opt Quant Electron

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Intelligent methods have been applied to many fields for a long time. Recently, Visible Light Communication (VLC) systems widely include learning and classification models to improve their performances. The classification of L-Pulse Position Modulation (L-PPM) formats is crucial for VLC systems since the modulation order L is very effective for providing energy efficiency and increasing the transmission capacity. In this paper, therefore, it is reported for the first time, the classification of PPM schemes in VLC systems by using Decision Tree, Knearest neighbor (KNN), Support Vector Machine (SVM), and a Direct Decision-based Linear Model (LM) technique. A novel feature extraction model is derived to be able to classify the type of PPM modulation schemes. A comparison has been given to observe the performance of classification schemes by taking into account the level of Signal to Noise Ratio and the transmission distance between receiver and transmitter. The KNN method gives the best accuracy performance against other schemes at the SNR of 25dB and the distance of 2.32m and more, while the Tree model is superior to KNN at the distances of 2.25m and 2.20m. Additionally, it has been obtained the best accuracy of 97.85% by the Decision Tree Model at the distance of 2.20m.

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Section: Introductionmentioning

confidence: 99%

The modulation classification methods in PPM–VLC systems

Ağır

Sönmez

2023

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“…The optimization of the receiver's field of view has also been proposed [11]. Using simulation results, it has been shown that communication performance can be improved significantly using a dynamic field-of-view receiver [9,19,20]. For hardware-level implementation, a mechanical iris has been used to dynamically change the receiver's field of view to improve communication performance in dense multi-cell VLC networks [21].…”

Section: Introductionmentioning

confidence: 99%

Interference Mitigation in VLC Systems using a Variable Focus Liquid Lens

Bera,

Karmakar

2024

Photonics

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The field of view (FOV) is an important parameter of a visible light communication (VLC) receiver. A variable FOV can be useful to mitigate interference from neighboring cells in a multi-cell VLC network. The existing works on dynamic FOV VLC receivers have used a mechanical iris to control the receiver’s FOV, making the VLC receiver bulky, slow, and power-consuming. In this article, an electronically controlled variable focus liquid lens is used to vary the FOV of the receiver dynamically. A low-cost microcontroller-based feedback control system controls the effective FOV of the receiver to reject signals from unwanted transmitters, thus maximizing the signal-to-interference plus noise ratio (SINR) of the received signal. Experimental results show that the proposed technique effectively improves SINR performance in a multi-cell VLC network. To the best of the authors’ knowledge, this is the first reported work to utilize an electronically controlled compact liquid lens for designing a dynamic FOV VLC receiver.

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Performance analysis of downlink multipath multi-user NOMA-VLC system

Kumar¹,

Sharan²,

Ghorai³

2022

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In the present paper, the performance of non-orthogonal multiple access (NOMA) in a downlink multipath multi-user Visible Light Communication (VLC) system has been evaluated w.r.t bit-error rate (BER), sum rate & outage probability. The results show that the sum rate and BER performance improve with the increase in semi-angle 𝝋 𝟏 𝟐 ⁄ of the LED using both Line-of-sight (LOS) and LOS plus first reflection (L-R1) signals. The simulation results display that there is optimal value of 𝝋 𝟏 𝟐⁄ at which minimum BER is achieved. However, the optimal angle of semi-angle varies with the number of users and order of reflection of signal. In case of two-user system with LOS signal, the optimal angle is 𝟓𝟎 𝟎 and 𝟕𝟎 𝟎 for user-1 & user-2 respectively, whereas, for three-user system the optimal angle is 𝟑𝟎 𝟎 for user-1 and it is 𝟓𝟎 𝟎 for each user-2 and user-3. The BER simulation results for L-R1 signal reveal that the successive interference cancellation (SIC) efficiently decodes the signal for two-user system with optimum performance at 𝝋 𝟏 𝟐 ⁄ equals to 𝟕𝟎 𝟎 but as the number of users increases to three, it fails to decode the signal. The results of sum rate vs. offset using LOS signal show that sum rate for two-user system monotonically increases & then decreases with the increase in semi-angle. The optimal angle is 𝟓𝟎 𝟎 for the maximum sum rate which also supports the BER results. The effect of shadowing (blocked LOS signal) shows that the sum rate is zero for lower values of semi-angle of LED. Finally, the outage probability against target rate of far user confirms the key finding results of shadowing.

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BER analysis of dynamic FOV based MIMO-NOMA-VLC system

Cited by 16 publications

References 18 publications

The modulation classification methods in PPM–VLC systems

The modulation classification methods in PPM–VLC systems

Interference Mitigation in VLC Systems using a Variable Focus Liquid Lens

Performance analysis of downlink multipath multi-user NOMA-VLC system

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