Two-Way Multiuser Mixed RF/FSO Relaying: Performance Analysis and Power Allocation

Al-Eryani, Yasser F.; Salhab, Anas M.; Zummo, Salam A.; Alouini, Mohamed‐Slim

doi:10.1364/jocn.10.000396

Cited by 50 publications

(26 citation statements)

References 18 publications

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“…In (14), n HD ∼ CN (0, N HD ) is a complex AWGN. Whilst in (15), n IMDD is a real AWGN where n IMDD ∼ N (0, N IMDD ) for the IMDD input-independent AWGN model, and n IMDD ∼ N (0, 2P r I FSO N HD E{x IMDD }) for the IMDD cost-dependent AWGN channel under the assumption of relatively high P r in comparison with the thermal and/or background noises power. The reader is referred to [23], [24] for details of the HD and the two IMDDs and their noises.…”

Section: B Design Of the Precoding And The Receiving Interference Elmentioning

confidence: 99%

“…Whereas, in case of IMDD we let the realization of C FSO designates a precise approximation 7 of the channel capacity of the second hop given the related realization of the second hop SNR (γ IMDD indp or γ IMDD cost ). But, given γ HD , γ IMDD indp or γ IMDD cost the FSO hop is, respectively, an AWGN channel, IMDD input-independent AWGN channel, or IMDD cost-dependent AWGN channel as expressed by (14) or (15). So, by utilizing the expressions of the AWGN channel capacity [19] and the approximations of both IMDD AWGN channel capacities [21], [24] we get C FSO in the following unified form (17), and by random variable transformation, the pdf of γ eff FSO can be expressed in a unified form as…”

Section: System Performance Analysis a Outage Probabilitymentioning

confidence: 99%

“…As a result, the mathematical model and the findings of the above AF researches do not provide the real performance of these AF mixed RF/FSO relayings in which IMDD is implemented. This nonnegativity of the IMDD transmitted signal can be attained by the decode-and-forward (DF) mixed RF/FSO relay systems as the one studied in [15]- [18]. Particularly, an outage performance analysis was presented in [16] for mixed MIMO-RF/FSO DF relay systems with underlay cognitive radio scenarios considering orthogonal space-time block coding (OSTBC) and transmit antenna selection (TAS).…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Mixed Interference Aligned MIMO RF/Unified FSO DF Relaying With Heterodyne Detection and Two IMDD Models

et al. 2020

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This paper considers a dual-hop decode-and-forward (DF) mixed radio frequency (RF)/free space optical (FSO) relaying scheme. In this scheme, the first hop is a multiple-input multiple-output (MIMO) RF interference channel (IC), while the second hop is an FSO channel in which heterodyne detection (HD) as well as intensity modulation-direct detection (IMDD) are considered in a unified analysis manner. It is assumed that the MIMO RF links follow Rayleigh fading, whilst the FSO link encounters Málaga (M) fading with pointing errors. In this work, the Interference alignment (IA) technique is utilized in the MIMO RF IC hop to eliminate the interference, and hence this leads to enhance the multiplexing gain in this hop, and accordingly the overall system performance is improved. The design of the IA precoding matrix and receiving interference eliminating matrix is performed by using adapting orthogonalized minimum leakage (OR-ML) algorithm. For the considered scheme, exact closed-form expressions are derived for the outage probability and ergodic capacity, in these expressions the best-known FSO channel capacity results are utilized. Moreover, not only the IMDD input-independent AWGN but also the IMDD cost-dependent AWGN channel is analyzed in these investigations. In addition, the system performance is studied asymptotically at the high SNRs region, where the diversity order and coding gain analyses are illustrated. Further, we allocate simulation results that verify the deduced analytical and asymptotic expressions.

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Section: B Design Of the Precoding And The Receiving Interference Elmentioning

confidence: 99%

Section: System Performance Analysis a Outage Probabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Mixed Interference Aligned MIMO RF/Unified FSO DF Relaying With Heterodyne Detection and Two IMDD Models

et al. 2020

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“…( ) ⋅ Γ is the Gamma function and ( ) ⋅ G is the Meijer's G function, and 3, 0, 1, 3 are the parameters associated with the Meijer's G function, they are defined in reference [23]. Using the same method as in RF link, the CDF of the Gamma-Gamma distribution with the influence of pointing error can be given by [24,25]: The RF link follows Rayleigh distribution in the hybrid RF-FSO system, the probability density function (PDF) of the RF link could be given as…”

Section: System and Channel Modelmentioning

confidence: 99%

Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation

Jiang¹,

Zhao²,

Liu

et al. 2019

Applied Sciences

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The improvement for hybrid radio frequency–free space optical (RF–FSO) communication system in wireless optical communications has acquired growing interests in recent years, but rarely improvement is based on hybrid modulation. Therefore, we conduct a research on end-to-end mixed RF–FSO system with the hybrid pulse position modulation–binary phase shift keying–subcarrier intensity modulation (PPM–BPSK–SIM) scheme. The RF link obeys Rayleigh distribution and the FSO link experiences Gamma–Gamma distribution. The average bit error rate (BER) for various PPM–BPSK–SIM schemes has been derived with consideration of atmospheric turbulence influence and pointing error condition. The outage probability and the average channel capacity of the system are discussed as well. Simulation results indicate that the pointing error aggravates the influence of atmospheric turbulence on the channel capacity, and the RF–FSO systematic performance is improved obviously while adopting PPM–BPSK–SIM under strong turbulence and severe pointing error conditions, especially, when the system average symbol length is greater than eight.

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“…On the other hand, impact of multiuser diversity (MUD) on interference limited mixed RF/FSO OWR systems has been indicated by the authors of [6]. Furthermore, research work [7] demonstrates the improvement imparted by MUD scheme on mixed RF/FSO TWR system for interference free transmission. Notably, no work has been reported on the effect of interference over MUD assisted mixed RF/FSO TWR system.…”

Section: Introductionmentioning

confidence: 99%

Interference-Limited Mixed MUD-RF/FSO Two-Way Cooperative Networks Over Double Generalized Gamma Turbulence Channels

2019

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In this letter, the performance of multiuser-radio frequency/free space optics (RF/FSO) two-way relay network in the presence of interference is investigated. The FSO link accounts for pointing errors and both types of detection techniques, i.e. intensity modulation/direct detection as well as coherent demodulation, which is modeled as double generalized gamma (D-GG) turbulence channel. On the other hand, the multiple users on the RF link are assumed to undergo Nakagami-m fading. Multiple co-channel interferers (CCIs) which corrupt the signal at relay node are modeled using Nakagami-m distribution. Specifically, the exact closed-form expressions for the outage probability (OP) of the overall system is derived. Moreover, the closed form expression for the achievable sum-rate (ASR) of the considered system is presented. In order to simplify the results, the asymptotic approximations of the OP and ASR are derived in terms of elementary functions. The results presented in the paper are validated by Monte-Carlo simulations.

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Two-Way Multiuser Mixed RF/FSO Relaying: Performance Analysis and Power Allocation

Cited by 50 publications

References 18 publications

Performance Analysis of Mixed Interference Aligned MIMO RF/Unified FSO DF Relaying With Heterodyne Detection and Two IMDD Models

Performance Analysis of Mixed Interference Aligned MIMO RF/Unified FSO DF Relaying With Heterodyne Detection and Two IMDD Models

Performance Improvement for Mixed RF–FSO Communication System by Adopting Hybrid Subcarrier Intensity Modulation

Interference-Limited Mixed MUD-RF/FSO Two-Way Cooperative Networks Over Double Generalized Gamma Turbulence Channels

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