Partial Relay Selection With Outdated Channel State Estimation in Mixed RF/FSO Systems

Petkovic, Milica I.; Cvetković, Dragoš; Djordjević, Goran T.; Karagiannidis, George K.

doi:10.1109/jlt.2015.2416972

Cited by 76 publications

(61 citation statements)

References 21 publications

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“…Since the coherence time of the channel is in the order of milliseconds (ms), turbulence induced fading remains constant over a large number of transmitted bits [23], [46]- [48]. In addition, the use of very long interleavers in order to achieve independent fading samples in consecutive symbol intervals is not practical in FSO channel [23].…”

Section: E Ergodic Capacitymentioning

confidence: 99%

See 1 more Smart Citation

Performance Analysis of Free-Space Optical Links Over Málaga ($\mathcal{M} $) Turbulence Channels With Pointing Errors

Ansari

Yılmaz²,

Alouini

2016

IEEE Trans. Wireless Commun.

392

290

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In this work, we present a unified performance analysis of a free-space optical (FSO) link that accounts for pointing errors and both types of detection techniques (i.e. intensity modulation/direct detection (IM/DD) as well as heterodyne detection). More specifically, we present unified exact closedform expressions for the cumulative distribution function, the probability density function, the moment generating function, and the moments of the end-to-end signal-to-noise ratio (SNR) of a single link FSO transmission system, all in terms of the Meijer's G function except for the moments that is in terms of simple elementary functions. We then capitalize on these unified results to offer unified exact closed-form expressions for various performance metrics of FSO link transmission systems, such as, the outage probability, the scintillation index (SI), the average error rate for binary and M -ary modulation schemes, and the ergodic capacity (except for IM/DD technique, where we present closed-form lower bound results), all in terms of Meijer's G functions except for the SI that is in terms of simple elementary functions. Additionally, we derive the asymptotic results for all the expressions derived earlier in terms of Meijer's G function in the high SNR regime in terms of simple elementary functions via an asymptotic expansion of the Meijer's G function. We also derive new asymptotic expressions for the ergodic capacity in the low as well as high SNR regimes in terms of simple elementary functions via utilizing moments. All the presented results are verified via computer-based Monte-Carlo simulations.Index Terms-Free-space optical (FSO) communications, optical wireless communications, pointing errors, Lognormal turbulence channels, Gamma-Gamma turbulence channels, Málaga (M) turbulence channels, outage probability (OP), binary modulation schemes, bit-error rate (BER), symbol error rate (SER), scintillation index (SI), ergodic capacity, Meijer's G function.are cost-effective relative to the traditional RF links. It is a promising technology as it offers full-duplex Gigabit Ethernet throughput in certain applications and environment offering a huge license-free spectrum, immunity to interference, and high security [1]. These features of FSO communication systems potentially enable solving the issues that the RF communication systems face due to the expensive and scarce spectrum [1]-[10]. Additionally, FSO communications does offer bandwidth as the world record stands at 1.2 Tbps or 1200 Gbps [11]. Besides these nice characteristic features of FSO communication systems, they span over long distances of 1Km or longer. However, the atmospheric turbulence may lead to a significant degradation in the performance of the FSO communication systems [1].Thermal expansion, dynamic wind loads, and weak earthquakes result in the building sway phenomenon that causes vibration of the transmitter beam leading to a misalignment between transmitter and receiver known as pointing error. These pointing errors may lead to significant perfo...

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Section: E Ergodic Capacitymentioning

confidence: 99%

“…Hence, our aim is to examine the best possible ergodic performance. Therefore, our ergodic capacity analysis is valid under the presence of the pointing errors and under the assumption that the information symbol is long enough to ensure the long-term ergodic properties of the turbulence process [47], [48]. …”

Section: E Ergodic Capacitymentioning

confidence: 99%

Performance Analysis of Free-Space Optical Links Over Málaga ($\mathcal{M} $) Turbulence Channels With Pointing Errors

Ansari

Yılmaz²,

Alouini

2016

IEEE Trans. Wireless Commun.

392

290

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“…The atmospheric turbulence fading against high data rate OWC link is relatively slowly varying. The channel coherence time is measured in milliseconds (ms), and the turbulence fluctuation can be assumed to be constant during a large number of consecutive symbol time slots . In addition, a single deep fading state could corrupt huge number of bits at Gbits/s data rates over OWC links.…”

Section: Adaptive Subcarrier Intensity Modulation Systemmentioning

confidence: 99%

Performance analysis of subcarrier intensity modulation using rectangular QAM over Malaga turbulence channels with integer and non‐integer β

Alheadary

Park

Alouini

2016

Wireless Communications

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In this paper, we derive the performances of optical wireless communication system utilizing adaptive subcarrier intensity modulation over the Malaga turbulent channel. More specifically, analytical closed‐form solutions and asymptotic results are derived for average bit error rate, achievable spectral efficiency, outage probability, and ergodic capacity by utilizing series expansion identity of modified Bessel function. Our asymptotic and analytical results based on series solutions with finite numbers highly matched to the numerical results. By exploiting the inherent nature of fading channel, the proposed adaptive scheme enhances the spectral efficiency without additional transmit power while satisfying the required bit error rate criterion. Copyright © 2016 John Wiley & Sons, Ltd.

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“…To overcome this discrepancy, recent work have proposed a more sophisticated model to describe moderate and strong fading called Double-Gamma. In fact, this model is widely used in recent work of mixed RF/FSO systems [3], [4] since it provides more accurate performance metrics (outage probability, average bit/symbol error rate, ergodic capacity) than Log-Normal model. Despite these advantages, Double-Gamma suffers from either overestimation and underestimation in the tail region of the probability density function (PDF).…”

Section: Introductionmentioning

confidence: 99%

Hybrid Rayleigh and Double-Weibull over impaired RF/FSO system with outdated CSI

Balti

Guizani

Hamdaoui

2017

2017 IEEE International Conference on Communications (ICC)

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In this work, we present a global framework of a dual-hop RF/FSO system with multiple relays operating at the mode of amplify-and-forward (AF) with fixed gain. Partial relay selection (PRS) protocol with outdated channel state information (CSI) is assumed since the channels of the first hop are timevarying. The optical irradiance of the second hop are subject to the Double-Weibull model while the RF channels of the first hop experience the Rayleigh fading. The signal reception is achieved either by heterodyne or intensity modulation and direct detection (IM/DD). In addition, we introduce an aggregate model of hardware impairments to the source (S) and the relays since they are not perfect nodes. In order to quantify the impairment impact on the system, we derive closed-form, approximate, upper bound and high signal-to-noise ratio (SNR) asymptotic of the outage probability (OP) and the ergodic capacity (EC). Finally, analytical and numerical results are in agreement using Monte Carlo simulation.

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Partial Relay Selection With Outdated Channel State Estimation in Mixed RF/FSO Systems

Cited by 76 publications

References 21 publications

Performance Analysis of Free-Space Optical Links Over Málaga ($\mathcal{M} $) Turbulence Channels With Pointing Errors

Performance Analysis of Free-Space Optical Links Over Málaga ($\mathcal{M} $) Turbulence Channels With Pointing Errors

Performance analysis of subcarrier intensity modulation using rectangular QAM over Malaga turbulence channels with integer and non‐integer β

Hybrid Rayleigh and Double-Weibull over impaired RF/FSO system with outdated CSI

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