An efficient MIMO–OFDM VLC system of combining space time block coding with orthogonal circulant matrix transform precoding

Chen, Mengru; Lu, Huimin; Chen, Danyang; Jin, Jianli; Wang, Jianping

doi:10.1016/j.optcom.2020.125993

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…The transmission to OFDM based system is currently planned and implementation of advanced software equalization techniques is a topic of further research, which will be built upon foundations laid by this article, as a number of foreign teams are focusing on their own OFDM platforms [35][36][37][38][39][40] or even MIMO solutions [41,42]. The 5G-VLC compatibility is the way and the presented platform will continue to evolve past current limitations.…”

Section: Discussionmentioning

confidence: 99%

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Danys¹,

Martínek²,

Jaroš³

et al. 2021

Computers, Materials &Amp; Continua

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This pilot study focuses on a real measurements and enhancements of a software defined radio-based system for vehicle-to everything visible light communication (SDR-V2X-VLC). The presented system is based on a novel adaptive optimization of the feed-forward software defined equalization (FFSDE) methods of the least mean squares (LMS), normalized LMS (NLMS) and QR decomposition-based recursive least squares (QR-RLS) algorithms. Individual parameters of adaptive equalizations are adjusted in real-time to reach the best possible results. Experiments were carried out on a conventional LED Octavia III taillight drafted directly from production line and universal software radio peripherals (USRP) from National Instruments. The transmitting/receiving elements used multistate quadrature amplitude modulation (M-QAM) implemented in LabVIEW programming environment. Experimental results were verified based on bit error ratio (BER), error vector magnitude (EVM) and modulation error ratio (MER). Experimental results of the pilot study unambiguously confirmed the effectiveness of the proposed solution (longer effective communication range, higher immunity to interference, deployment of higher state QAM modulation formats, higher transmission speeds etc.), as the adaptive equalization significantly improved BER, MER and EVM parameters. The best results were achieved using the QR-RLS algorithm. The results measured on deployed QR-RLS algorithm had significantly better Eb/N0 (improved by approx. 20 dB) and BER values (difference by up to two orders of magnitude).

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Section: Discussionmentioning

confidence: 99%

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Danys¹,

Martínek²,

Jaroš³

et al. 2021

Computers, Materials &Amp; Continua

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“…Since dense sampling has these characteristics, it is superior to other methods in tracking target objects in terms of accuracy. Moved samples of objects can be obtained by dense sampling using circular matrix characteristics and fast Fourier transform (FFT) [44,45] without complicated processes [46]. Usually, in the case of one-dimensional vector u = [u 1 , u 2 , …, u n ] T , the circulant matrix C(u) of n × n is defined as Eq.…”

Section: Creation Of Target Object Modelmentioning

confidence: 99%

Efficient covering of target areas using a location prediction-based algorithm

Jang

2020

J Supercomput

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Due to the rapid development of the high-speed wired and wireless Internet, image contents including objects with exposed personal information are being distributed freely, which is a social problem. In this paper, we introduce a method of robustly detecting a target object with facial region exposed from an image that is quickly entered using skin color and a deep learning algorithm and effectively covering the detected target object through prediction. The proposed method in this paper accurately detects the target object containing facial region exposed from the image entered by applying an image adaptive skin color model and a CNN-based deep learning algorithm. Subsequently, the location prediction algorithm is used to quickly track the detected object. A mosaic is overlapped over the target object area to effectively protect the object area where the facial region is exposed. The experimental results show that the proposed approach accurately detects the target object including the facial region exposed from the continuously entered video, and efficiently covers the detected object through mosaic processing while quickly tracking it using a prediction-based tracking algorithm. The tracking-based target covering method proposed in this study is expected to be useful in various practical applications related to pattern recognition and image security, such as content-based image retrieval, real-time surveillance, human-computer interaction, and face detection.

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“…Özellikle artan veri trafiği probleminin üstesinden gelebilmek için RF (Radio Frequency: Radyo Frekans) sistemler ile birlikte kapalı ortam haberleşmesinde yüksek veri hızlarını desteklemek için aday bir haberleşme sistemi olarak görülmektedir [5,6]. Bu nedenle haberleşme sistemlerinin spektrum verimliliğini geliştirmenin oldukça büyük önem arz ettiği görülmektedir [7,8]. Yapılan çalışmalar incelendiğinde biyomedikal [9], güç hattı haberleşmesi [10], su altı haberleşmesi [11] gibi birçok alanda VLC yönteminin uygulandığı görülmektedir.…”

Section: Introductionunclassified

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Sönmez

2022

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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In the study, the performance analysis of error correction structures has been investigated for the DH-PIM method which is proposed for optical communication systems. A suitable system model for erasure and false alarm errors are obtained to join the Visible Light Communication (VLC) Systems. A theoretical framework is given for the model in this paper. New digital circuit based architecture is improved for erasure error structure in a FPGA (Field Programmable Gate Arrays) complier Quartus. The results are investigated in the Modelsim-Altera simulator in terms of the time chart. According to obtained results, it is shown that proposed digital circuit based architecture can successfully correct the error slots. Additionally, the performance of slot error rate has been analyzed for both erasure and false alarm errors of which the theoretical frameworks are obtained. It is shown from results that erasure error correction system (S-DHPIM) has better slot error rate performance than that of traditional DH-PIM (G-DHPIM). Addition to this, it is indicated that DH-PIM with erasure and false alarm correction structure (SY-DHPIM) gives better slot error performance compared with the S-DHPIM.

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An efficient MIMO–OFDM VLC system of combining space time block coding with orthogonal circulant matrix transform precoding

Cited by 13 publications

References 19 publications

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Efficient covering of target areas using a location prediction-based algorithm

DH-PIM İletim Yöntemi için Bir Hata Düzeltme Yapısı

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