Switching-based hybrid FSO/RF transmission for DF relaying system

Sharma, Shubha; Madhukumar, A. S.; Swaminathan, R

doi:10.1109/wcnc.2018.8377157

Cited by 19 publications

(22 citation statements)

References 10 publications

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“…Further, in [2], the author uses a hybrid approach but does not implement switching, as RF and optical are given predefined tasks. In [14], the authors described a switching scheme based on the SNR threshold. This approach is less computationally expensive and hence can be developed further.…”

Section: Literature Review and Research Gapsmentioning

confidence: 99%

Best beam selection and PHY switching policy for hybrid FSO/RF inter‐satellite communication link

2020

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Section: Literature Review and Research Gapsmentioning

confidence: 99%

Best beam selection and PHY switching policy for hybrid FSO/RF inter‐satellite communication link

2020

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“…It is important to note that this leads to wastage of power and unnecessary interference. The second category is hard switching, where either the FSO or RF link is selected based on the channel conditions [6]- [9]. A Shubha Sharma and A S Madhukumar are with the School of Computer Science and Engineering, Nanyang Technological University Singapore, Singapore 639798, e-mail: shubha002, asmadhukumar@ntu.edu.sg.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to note that the aforementioned schemes are restricted to a single-hop (SH) system. It is to be noted that FSO and MMW RF transmissions are confined to short distances [6]- [9]. Consequently for a backhaul network, a distributed architecture is required, where the back-haul traffic is relayed from the small cell base station (BS) to adjacent BS and then finally forwarded to the macrocell BS as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Switching-Based Cooperative Decode-and-Forward Relaying for Hybrid FSO/RF Networks

Sharma¹,

Madhukumar²,

Swaminathan³

2019

J. Opt. Commun. Netw.

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In this paper, we propose a novel switching scheme for hybrid free-space optical (FSO)/radio frequency (RF) system with selective decode-and-forward (DF) relay network. Specifically, the system transmits over FSO channels when the instantaneous signal-to-noise ratio (SNR) at the FSO receiver is greater than the threshold SNR. If the SNR drops below the threshold, the system switches its transmission over RF channels. The exact outage probability and average symbol error rate (SER) expressions are derived for selective DF relay network with maximal ratio combining (MRC) assumed at the destination. In addition, the asymptotic outage and SER expressions with lower computational complexity are derived and the diversity order is determined. The optimum value of threshold SNR, which satisfies target SER, has been calculated numerically for the proposed switching scheme. The theoretical results, which are validated by Monte-carlo simulations, show that the proposed switching scheme for cooperative hybrid FSO/RF system drastically improves the performance compared to that of single hop (SH) switching-based hybrid FSO/RF and cooperative FSO systems.

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“…In [10], a DF-based RF-FSO mixed system is considered with a single multiple input-output (SIMO) RF source-relay links and a mono-mono-input-output (SISO) FSO relay at destination link. In [11], the authors analyzed the performance of a switching-based FSO/RF hybrid transmission in a DH scenario with combining selection (SC). In [12], the authors consider a mixed RF-FSO system with a double-hop AF relay in which a partial relay selection scheme was used to select the best relay.…”

Section: Introductionmentioning

confidence: 99%

Performance of Hybrid RF/FSO Cooperative Systems Based on Quasicyclic LDPC Codes and Space-Coupled LDPC Codes

Gueye

Dioum

Diop

et al. 2020

Wireless Communications and Mobile Computing

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Free space optical (FSO) communication systems provide wireless line of sight connectivity in the unlicensed spectrum, and wireless optical communication achieves higher data rates compared to their radio frequency (RF) counterparts. FSO systems are particularly attractive for last mile access problem by bridging fiber optic backbone connectivity to RF access networks. To cope with this practical deployment scenario, there has been increasing attention to the so-called dual-hop (RF/FSO) systems where RF transmission is used at a hop followed by FSO transmission to another. In this article, we study the performance of cooperative transmission systems using a mixed RF-FSO DF (decode and forward) relay using error-correcting codes including QC-LDPC codes at the relay level. The FSO link is modeled by the gamma-gamma distribution, and the RF link is modeled by the Additive White Gaussian Noise (AWGN) model. Another innovation in this article is the use of cooperative systems using a mixed FSO/RF DF relay using quasicyclic low-density parity check (QC-LDPC) codes at the relay level. We also use the space-coupled low-density parity check (SC-LDPC) codes on the same scheme to show its importance in cooperative optical transmission but also in hybrid RF/FSO transmission. The latter will be compared with QC-LDPC codes. The use of mixed RF/FSO cooperative transmission systems can improve the reliability and transmission of information in networks. The results demonstrate an improvement in the performance of the cooperative RF/FSO DF system based on QC-LDPC and SC-LDPC codes compared to RF/FSO systems without the use of codes, but also to the DF systems proposed in the existing literature.

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Switching-based hybrid FSO/RF transmission for DF relaying system

Cited by 19 publications

References 10 publications

Best beam selection and PHY switching policy for hybrid FSO/RF inter‐satellite communication link

Best beam selection and PHY switching policy for hybrid FSO/RF inter‐satellite communication link

Switching-Based Cooperative Decode-and-Forward Relaying for Hybrid FSO/RF Networks

Performance of Hybrid RF/FSO Cooperative Systems Based on Quasicyclic LDPC Codes and Space-Coupled LDPC Codes

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