Probabilistic Shaping for Asymmetric Channels and Low-Density Parity-Check Codes

Wiegart, Thomas; Wang, Linfang; Lentner, Diego; Wesel, Richard D.

doi:10.1109/istc57237.2023.10273531

2023 12th International Symposium on Topics in Coding (ISTC) 2023

DOI: 10.1109/istc57237.2023.10273531

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Probabilistic Shaping for Asymmetric Channels and Low-Density Parity-Check Codes

Thomas Wiegart,

Linfang Wang,

Diego Lentner

et al.

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2024

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“…Figure 3. Average rate in(18) for an IM/DD system: OOK transmission over AWGN, fast fading, and block fading channels; see text for parameters' values.…”

mentioning

confidence: 99%

An Information-Theoretic Comparison Between Coherent and IM/DD Transmissions for Free Space Optical Communications

Zahr,

Colavolpe,

Foggi

et al. 2024

IEEE J. Select. Areas Commun.

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We investigate the performance of free-space optical communication systems in the presence of atmospheric turbulence to assess the advantages that a coherent communication system can bring with respect to a conventional intensity modulation and direct detection (IM/DD) system. The perspective is an information-theoretic one, hence we evaluate the mutual information and the corresponding outage probability of both channels, with various traditional symbol constellations, as a pragmatic approximation to the capacity, or to the outage capacity, of those channels. In addition, we analyze non-uniform symbol constellations to evaluate the possible shaping gain that can be achieved under different channel conditions. We propose a method to quantify the gain that the coherent solution can achieve, in terms of signal-to-noise ratio (SNR), so that it can be compared, on a techno-economical basis, against the higher cost that it implies.

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“…Figure 3. Average rate in(18) for an IM/DD system: OOK transmission over AWGN, fast fading, and block fading channels; see text for parameters' values.…”

mentioning

confidence: 99%

An Information-Theoretic Comparison Between Coherent and IM/DD Transmissions for Free Space Optical Communications

Zahr,

Colavolpe,

Foggi

et al. 2024

IEEE J. Select. Areas Commun.

View full text Add to dashboard Cite

show abstract

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Probabilistic Shaping for Asymmetric Channels and Low-Density Parity-Check Codes

Cited by 1 publication

References 17 publications

An Information-Theoretic Comparison Between Coherent and IM/DD Transmissions for Free Space Optical Communications

An Information-Theoretic Comparison Between Coherent and IM/DD Transmissions for Free Space Optical Communications

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