Dual-Hop Optical Wireless Relaying Over Turbulence Channels With Pointing Error Impairments

Aggarwal, Mona; Garg, Parul; Puri, Parul

doi:10.1109/jlt.2014.2313859

Cited by 32 publications

(20 citation statements)

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“…We consider a SIM-based dual-hop OWC system with three nodes, a source (s), a destination (d) and a single relay (r) as in [9]. The transceiver mounted on relay consists of two directional apertures (one directed towards the source and other towards the destination) and the source and destination transceivers are equipped with single directional apertures directed towards the relay.…”

Section: Statistical Characterization a System Modelmentioning

confidence: 99%

“…The instantaneous electrical SNR, Γ xy for {xy} ∈ {sr, rd} is given as Γ xy = (ηh xy ) 2 /N 0 where η is the optical to electrical conversion ratio, N 0 is the variance of AWGN. The pdf of Γ xy can be written, as in [9], as…”

Section: B Channel Modelmentioning

confidence: 99%

“…Recently the subcarrier intensity modulation (SIM) has emerged as an attractive alternative to OOK IM/DD systems. In [8], the outage and SER performance of SIM based AF relayed OWC systems have been analyzed considering moderate to strong turbulence regimes with pointing error impairments whereas in [9], ergodic capacity of SIM-based AF relayed OWC system has been studied for various channel adaptive transmission schemes.…”

Section: Introductionmentioning

confidence: 99%

“…The AF relay simply amplifies and forwards the incoming signal towards the destination whereas the DF relay decodes the incoming signal and then retransmits the decoded version towards the destination. The performance analysis of relay assisted OWC systems employing different system models (serial and/or parallel) has been done in [2]- [9]. The authors in [2] studied the outage probability of serial and parallel relaying transmission schemes employing both type of relays over weak turbulence regimes.…”

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confidence: 99%

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Ergodic Capacity of SIM-Based DF Relayed Optical Wireless Communication Systems

Aggarwal

Garg

Puri

2015

IEEE Photon. Technol. Lett.

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In this letter, we consider a dual-hop, subcarrier intensity modulation (SIM) based relayed optical wireless communication system under the combined influence of atmospheric turbulence and pointing error impairments. The turbulenceinduced fading is modeled by independent but not necessarily identically distributed (i.n.i.d.) Gamma-Gamma fading statistics with misalignment fading. The relaying protocol followed by the relay is decode and forward (DF). We first, derive the statistics of instantaneous signal to noise ratio (SNR) at the destination, followed by the novel and exact analytical expressions for ergodic capacity of the system in terms of mathematically tractable Meijer's G-function and extended generalized bivariate Meijer's G-function (EGBMGF).keywords: Ergodic capacity, extended generalized bivariate Meijer's G-function (EGBMGF), Gamma-Gamma distribution, pointing errors. I. INTRODUCTIONWith the increasing demand for high data rate capacity, the optical wireless communication (OWC) systems are gaining considerable research interest in recent times. However, the performance of these systems is vulnerable to adverse channel conditions which occur mainly due to atmospheric turbulenceinduced fading and pointing errors [1]. In case the source is not in line-of-sight (LOS) with the destination or the distance between the two is large enough to communicate, the relay-assisted communication can be employed to mitigate the adverse effects of atmospheric turbulence [2].In literature, we study two type of relays i.e. amplify and forward (AF) and decode and forward (DF). The AF relay simply amplifies and forwards the incoming signal towards the destination whereas the DF relay decodes the incoming signal and then retransmits the decoded version towards the destination. The performance analysis of relay assisted OWC systems employing different system models (serial and/or parallel) has been done in [2]- [9]. The authors in [2] studied the outage probability of serial and parallel relaying transmission schemes employing both type of relays over weak turbulence regimes. The outage and error performance of AF relayed OWC systems have been studied in [3] over moderate to strong turbulence regimes.Another important issue of concern with OWC systems is pointing errors, which occur as a result of misalignment between source and destination transceivers due to sway of highrise buildings with dynamic wind loads, thermal expansions

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Section: Statistical Characterization a System Modelmentioning

confidence: 99%

Section: B Channel Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Ergodic Capacity of SIM-Based DF Relayed Optical Wireless Communication Systems

Aggarwal

Garg

Puri

2015

IEEE Photon. Technol. Lett.

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“…Throughout the years, the end-to-end SNR has been upper bounded by the minimum SNR among the sublinks [32] and harmonic mean of the each link SNR [33]. Few research work have been reported focusing on variable gain FSO relay systems over Gamma-Gamma with pointing errors [4], [34], [35].…”

Section: Introductionmentioning

confidence: 99%