Switch-and-stay and switch-and-examine dual diversity for high-speed free-space optics links

Moradi, Hassan; Refai, Hazem H.; LoPresti, Peter G.

doi:10.1049/iet-opt.2011.0007

Cited by 27 publications

(13 citation statements)

References 18 publications

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“…Substituting Equation (20) into Equation (21), and substituting the results into Equation (16), the exact closed-form expression for the average BER of BPPM signals is obtained. Although the derived exact BER expression can be numerically evaluated through commercially available mathematics software, for example, Mathematica.…”

Section: Average Bermentioning

confidence: 99%

“…Optical preamplifiers increase receiver sensitivity and therefore can provide more link margin to protect optical signals against turbulence-induced fading. Moreover, due to the low absorption characteristics of atmosphere in the 1550 nm wavelength band, erbium-doped fiber amplifiers (EDFA), which have obtained commercial success in fiber-optic communications field, can be involved in FSO systems along with other available devices for this wavelength band [20].…”

Section: Introductionmentioning

confidence: 99%

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Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma–gamma atmospheric turbulence channels

Zhao¹,

Han²,

Yi³

2013

Journal of Modern Optics

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Journal of Modern Optics (2013): Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma-gamma atmospheric turbulence channels, Journal of Modern Optics,The error performance was investigated of free-space optical (FSO) systems that use optical preamplifiers and diversity reception in turbulent atmosphere with gamma-gamma distribution. More specifically, assuming that the dominant sources of the receiver noises are the background light and amplifier spontaneous emission noises, we develop an exact bit-error-rate (BER) expression for binary pulse position modulation (BPPM) by a moment-generating function (MGF) derivative-based method. To gain more insight, we also derive a closed-form asymptotic BER expression for BPPM at high received optical power, by which we obtain the diversity and coding gains of the considered systems. Our analytical results lead to the observations that the attained diversity gain only changes with the gamma-gamma distribution parameters and the number of spatial modes collected by the receiver, while independent on the number of temporal modes passed by the optical preamplifiers. We verify the analytical results by Monte Carlo simulations.

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Section: Average Bermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma–gamma atmospheric turbulence channels

Zhao¹,

Han²,

Yi³

2013

Journal of Modern Optics

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“…In SSC, once the existing received SNR drops below a certain threshold level, the combiner switches to the next branch, regardless of SNR for the new branch even if it is less than the original branch. In SSC and SEC diversity schemes there is no need for continual monitoring of all receiving signals, thus leading to a much simplified receiver design compared to SelC at the cost of inferior performance [10,33].…”

Section: Partial Correlation In Turbulences At Channelsmentioning

confidence: 99%

Route diversity analyses for free-space optical wireless links within turbulent scenarios

Zvánovec¹,

Pérez²,

Ghassemlooy³

et al. 2013

Opt. Express

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Free-Space Optical (FSO) communications link performance is highly affected when propagating through the time-spatially variable turbulent environment. In order to improve signal reception, several mitigation techniques have been proposed and analytically investigated. This paper presents experimental results for the route diversity technique evaluations for a specific case when several diversity links intersects a common turbulent area and concurrently each passing regions with different turbulence flows.

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“…Hence, the number of estimations in switched combining is less than that in SC since estimating all diversity antennas is not necessary for switched combining. Several schemes of switched combining such as switch-and-stay combining (SSC), switch-and-examine combining (SEC), and switch-and-examine combining with post-examining selection (SECps) have been presented [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…In SSC, no improvements can be achieved with more than two branches [10]. SEC [11][12][13][14][15][16] has been investigated to make use of additional diversity branches when the number of diversity antennas is greater than two. In SEC, the receiver examines the SNR of the next branch and switches again only if this SNR is unacceptable.…”

Section: Introductionmentioning

confidence: 99%

Multiple Antenna Selection Schemes with a RF Reconfigurable Power Combiner

Fan

Jin

Geng

et al. 2015

Wireless Pers Commun

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In this letter, we propose multiple antenna selection (MAS) for switch-andexamine combining, switch-and-examine combining with post-examining selection (SECps) and selection combining (SC), respectively. The performances of these diversity combining schemes can all be improved by MAS with one RF chain. In practice, MAS is implemented by using a RF reconfigurable power combiner instead of RF switch in frontend, which keeps one RF chain and makes full use of the signals from different diversity antennas. The signals in MAS are not only from each separated antenna but also from their combinations because the RF reconfigurable power combiner can work as a RF switch as well as a RF power combiner under different control conditions. Hence, more selections can be obtained and stronger signal-to-noise ratio may be provided in MAS schemes. In addition, with the appropriate switching threshold, MAS-SECps can provide the same performance as MAS-SC while requiring less estimations.

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Switch-and-stay and switch-and-examine dual diversity for high-speed free-space optics links

Cited by 27 publications

References 18 publications

Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma–gamma atmospheric turbulence channels

Error performance analysis for FSO systems with diversity reception and optical preamplification over gamma–gamma atmospheric turbulence channels

Route diversity analyses for free-space optical wireless links within turbulent scenarios

Multiple Antenna Selection Schemes with a RF Reconfigurable Power Combiner

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