Relay-assisted OFDM-based visible light communications over multipath channels

Narmanlioglu, Omer; Kızılırmak, Refik Çağlar; Uysal, Murat

doi:10.1109/icton.2015.7193338

Cited by 20 publications

(16 citation statements)

References 10 publications

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“…Among the various possible strategies available for user-based relay assisted cooperation [ 19 , 20 ], in this paper we have adopted: the AF and DF schemes. In this case, the source transmits a packet (or symbol) in one time slot and the RN re-transmits it in the next time slot, which are then combined at the destination prior to decision making.…”

Section: System Modelmentioning

confidence: 99%

“…OFDM VLC over frequency-selective indoor channels was analyzed in [ 19 ] providing the first analytical statistics for pure VLC relaying using amplify-and-forward (AF) or decode-and-forward (DF) relaying schemes. In [ 20 ] a relay based DC-biased optical OFDM (DCO-OFDM) VLC was investigated for two test cases using a desk lamp and a ceiling light lamp to provide optimal power allocation and improved bit error rate (BER) performance when employing relays compared to the direct transmission.…”

Section: Introductionmentioning

confidence: 99%

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Mobile User Connectivity in Relay-Assisted Visible Light Communications

Pešek

Zvánovec

Chvojka

et al. 2018

Sensors

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In this paper, we investigate relay-assisted visible light communications (VLC) where a mobile user acts as a relay and forwards data from a transmitter to the end mobile user. We analyse the utilization of the amplify-and-forward (AF) and decode-and-forward (DF) relaying schemes. The focus of the paper is on analysis of the behavior of the mobile user acting as a relay while considering a realistic locations of the receivers and transmitters on a standard mobile phone, more specifically with two photodetectors on both sides of a mobile phone and a transmitting LED array located upright. We also investigate dependency of the bit error rate (BER) performance on the azimuth and elevation angles of the mobile relay device within a typical office environment. We provide a new analytical description of BER for AF and DF-based relays in VLC. In addition we compare AF and DF-based systems and show that DF offers a marginal improvement in the coverage area with a BER < 10–3 and a data rate of 100 Mb/s. Numerical results also illustrate that relay-based systems offer a significant improvement in terms of the coverage compared to direct non-line of sight VLC links.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobile User Connectivity in Relay-Assisted Visible Light Communications

Pešek

Zvánovec

Chvojka

et al. 2018

Sensors

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show abstract

“…While the AF relay amplifies the received signal and forwards it to the end-user, the received signal is either decoded and forwarded by DF relays or compressed and forwarded by the CF relay to the destination. However, the cooperative version of DF protocols is known to be superior to the AF and DF protocols in terms of system performance and energy consumption [ 9 ]. However, this research work only considers SDF and IDF relay systems due its low complexity and simplicity for practical implementation in VLC.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Cooperative and Non-Cooperative Relaying over VLC Channels

Gheth

Rabie

Adebisi

et al. 2020

Sensors

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The line-of-sight (LoS) channel is one of the requirements for efficient data transmission in visible-light communications (VLC), but this cannot always be guaranteed in indoor applications for a variety of reasons, such as moving objects and the layout of rooms. The relay-assisted VLC system is one of the techniques that can be used to address this issue and ensures seamless connectivity. This paper investigates the performance of half-duplex (HD) conventional DF relay system and cooperative systems (i.e., selective DF (SDF) and incremental DF (IDF)) over VLC channels in terms of outage probability and energy consumption. Analytical expressions for both outage probability and the minimum energy-per-bit performance of the aforementioned relaying systems are derived. Furthermore, Monte Carlo simulations are provided throughout the paper to validate the derived expressions. The results show that exploiting SDF and IDF relaying schemes can achieve approximately 25% and 15% outage probability enhancement compared to single-hop and DF protocols, respectively. The results also demonstrate that the performance of the single-hop VLC system deteriorates when the end-to-end distances become larger. For example, when the vertical distance is 3.5m, the single-hop approach consumes 20%, 40% and 45% more energy in comparison to the DF, SDF, and IDF approaches, respectively.

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“…This technology uses light emitting diodes (LEDs) to transmit data to the end users, this makes its potential implementation complexity and cost very low. Thanks to these reasons, VLC has become a very attractive technology and one of the most crucial green communication technologies for such applications [1]. Recent works have considered VLC as an alternative or complementary technology to communications [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that this system was efficient in terms of capacity. Improving the performance of the VLC systems by developing cooperation between light sources in indoor environment was investigated in [10]. The authors concluded that the achievable performance by deploying DF relaying was slightly higher than that accomplished by the implementation of AF relaying.…”

Section: Introductionmentioning

confidence: 99%

Energy-per-bit performance analysis of relay-based visible-light communication systems

Gheth

Rabie

Adebisi

et al. 2019

Physical Communication

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Relaying systems, such as amplify-and-forward (AF), decode-and-forward (DF), selective DF (SDF) and incremental DF (IDF) relaying are usually used to ensure high performance and reliability for communication systems. A comprehensive energy efficiency performance study for different halfduplex relaying protocols, namely DF, SDF and IDF over visible light communication (VLC) channels is provided in this paper. Accurate analytical expressions for both outage probability and the minimum energy-per-bit performance of the aforementioned relaying systems are derived. For the sake of comparison and to justify the use of relays in the proposed system, the performance of a single-hop scenario is analyzed and compared to the relay-based links. The accuracy of the analysis is verified by Monte Carlo simulations. The results reveal that the single-hop VLC system offers the poorest performance compared to that offered by VLC relay-based systems particularly for relatively high end-to-end distances. However, the best performance is offered by SDF and IDF schemes as they have a lower outage probability than other systems under consideration. This work also shows that the performance of the systems under consideration is affected by some parameters, such as the vertical distance to user plane and the maximum cell radius of the LED.

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Relay-assisted OFDM-based visible light communications over multipath channels

Cited by 20 publications

References 10 publications

Mobile User Connectivity in Relay-Assisted Visible Light Communications

Mobile User Connectivity in Relay-Assisted Visible Light Communications

Performance Analysis of Cooperative and Non-Cooperative Relaying over VLC Channels

Energy-per-bit performance analysis of relay-based visible-light communication systems

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