Rateless Coding on Experimental Temporally Correlated FSO Channels

Anguita, Jaime A.; Neifeld, Mark A.; Hildner, B.; Vasić, Bane

doi:10.1109/jlt.2010.2040136

Cited by 59 publications

(50 citation statements)

References 42 publications

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“…By using this approach, it is not possible to obtain a time resolution that is less than one correlation time, i.e., the time in which the amplitude of normalized covariance function is equal to 0.5 [25]. In order to improve the resolution, a time correlation between the irradiance samples has to be introduced.…”

Section: Theoretical Background For Data Analysismentioning

confidence: 99%

See 1 more Smart Citation

Indoor free space optics link under the weak turbulence regime: measurements and model validation

Pernice¹,

Andò²,

Cardinale³

et al. 2015

IET Communications

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Institution of Engineering and Technology (IET)Pernice Abstract:In this paper, we present the measurements performed on a free space optics (FSO) communications link using an indoor atmospheric chamber. In particular, we have generated several different optical turbulence conditions, demonstrating how even the weak turbulence regime can strongly affect the FSO link performance. We have carried out an in-depth analysis of the data collected during the measurements, and calculated the turbulence strength (i.e. scintillation index and Rytov variance) and the important performance metrics (i.e., the Q-factor and bit error rate) to evaluate the FSO link quality.Moreover, we have tested, for the first time, an appositely developed temporally-correlated Gamma-Gamma channel model to generate the temporal irradiance fluctuations observed at the receiver. This has been accomplished by using a complete analysis tool that enables us to fully simulate the experimental FSO link. Finally, we compare the generated time-series with the collected experimental data, showing a good agreement and thus proving the effectiveness of our model.

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Section: Theoretical Background For Data Analysismentioning

confidence: 99%

“…In the literature, such information is mainly obtained from the measurements, thus limiting the analysis for given experimental conditions [25,26].…”

Section: Introductionmentioning

confidence: 99%

Indoor free space optics link under the weak turbulence regime: measurements and model validation

Pernice¹,

Andò²,

Cardinale³

et al. 2015

IET Communications

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show abstract

“…In general, the overall transmission delay can be expected to exceed 100 ms and therefore it is not practical to implement FEC-interleaving schemes for delay-critical data. Latency can be alleviated by introducing rate-compatible (or rateless) coding into the error correction scheme [181]. A key aspect of rateless coding is that the receiver is capable of decoding the original information, with high probability, even if only part of the original information is available.…”

Section: Fade Mitigation Techniquesmentioning

confidence: 99%

A review of communication-oriented optical wireless systems

Borah

Boucouvalas

Davis

et al. 2012

J Wireless Com Network

183

104

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This article presents an overview of optical wireless (OW) communication systems that operate both in the short-(personal and indoor systems) and the long-range (outdoor and hybrid) regimes. Each of these areas is discussed in terms of (a) key requirements, (b) their application framework, (c) major impairments and applicable mitigation techniques, and (d) current and/or future trends. Personal communication systems are discussed within the context of point-to-point ultra-high speed data transfer. The most relevant application framework and related standards are presented, including the next generation Giga-IR standard that extends personal communication speeds to over 1 Gb/s. As far as indoor systems are concerned, emphasis is given on modeling the dispersive nature of indoor OW channels, on the limitations that dispersion imposes on user mobility and dispersion mitigation techniques. Visible light communication systems, which provide both illumination and communication over visible or hybrid visible/ infrared LEDs, are presented as the most important representative of future indoor OW systems. The discussion on outdoor systems focuses on the impact of atmospheric effects on the optical channel and associated mitigation techniques that extend the realizable link lengths and transfer rates. Currently, outdoor OW is commercially available at 10 Gb/s Ethernet speeds for Metro networks and Local-Area-Network interconnections and speeds are expected to increase as faster and more reliable optical components become available. This article concludes with hybrid optical wireless/radio-frequency (OW/RF) systems that employ an additional RF link to improve the overall system reliability. Emphasis is given on cooperation techniques between the reliable RF subsystem and the broadband OW system.

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“…The selection of coding scheme to combat such channel conditions has been a challenging research issue. Coding schemes that have already been proposed are coded multi-input multi-output (MIMO) [3] and rate-less coding [2] as well as adaptive coded modulation [4]. Low-density parity-check (LDPC) codes are advocated in [3].…”

Section: Introductionmentioning

confidence: 99%

“…In MIMO, more than one source and receiver are installed to provide spatial diversity for better resilience against turbulence. Raptor codes (concatenation of an inner code with an outer fountain code such as Luby transform (LT)) have been shown to provide significant tolerance to atmospheric turbulence [2]. In [4], adaptation of modulation and code has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Adaptive coded modulation for FSO links

Fatima

Muhammad

Leitgeb

2012

2012 8th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP)

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The terrestrial free space optical (FSO) link promises a number of advantages in terms of higher data rates and license free bandwidth, but is challenged by atmospheric propagation conditions. Designing a system for the worst channel conditions leads to an inadequate use of resources while opting for a system design based on clear sky conditions lacks reliability.The key idea behind this work is to adapt the system design in terms of modulation order and code rate according to the channel conditions for obtaining high data rates as well as reliability. The adaptation is based on an estimate of received signal strength through a low rate RF feedback path. Modulation schemes and coding techniques are adapted at the transmitter based on the signal estimate.-PAM and -PPM have been studied along with LDPC codes with different code rates to select an appropriate combination of modulation and code rate based on channel conditions. 16-PPM with LDPC code rate 2/3 has been selected in this work for slightly adverse channel condition providing an overall gain of 13 dB compared to 2-PPM (the equivalent of IM/DD) and 8-PAM with LDPC code rate 2/3 if channel is in good state.

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Rateless Coding on Experimental Temporally Correlated FSO Channels

Cited by 59 publications

References 42 publications

Indoor free space optics link under the weak turbulence regime: measurements and model validation

Indoor free space optics link under the weak turbulence regime: measurements and model validation

A review of communication-oriented optical wireless systems

Adaptive coded modulation for FSO links

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