Probabilistically shaped coded modulation for IM/DD system

He, Zonglong; Bo, Tianwai; Kim, Hoon

doi:10.1364/oe.27.012126

Cited by 45 publications

(19 citation statements)

References 6 publications

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“…In this section, Monte Carlo simulations and numerical results are depicted to evaluate the performance of the proposed SpaDCoM schemes. The uniform signaling, M -PAM capacity, capacity bounds in [5, (1)] and [3, (3)], and coded modulation scheme in [23] are used as benchmarks for the performance. In all numerical results, the optimal distribution for the proposed scheme is obtained according to the procedures in Section V. The back-off rate, required input parameter for Algorithm 2, is set as R backoff = 0.05.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…8 In Fig. 5, the performance of the proposed scheme is compared with both uniform signaling and pairwise coded modulation [23], in terms of the frame error rate (FER) using Monte Carlo simulation. The transmission rates of the schemes are kept constant at 1.5 bpcu.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The corresponding values for uniform signaling are p = [1/4, 1/4, 1/4, 1/4], ∆ u 2P/(M − 1), and c = 3/4, respectively. As an additional benchmark, the performance of the CM scheme in [23] is shown. The FEC rate and the pairwise distribution, i.e., two consecutive symbols have the same probability, are adjusted to yield the target rate and power.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…At the receiver, MSD is required, leading to error propagation and long latency due to the successive decoding of bit levels [22]. 1 In [23], a sub-optimal coded modulation scheme for IM/DD channels is proposed with unipolar M -PAM. In this approach, only the even-indexed symbols are freely probabilistically shaped, while the probability of the odd-indexed symbols is forced to equal the probability of the preceding even symbol.…”

Section: A Related Workmentioning

confidence: 99%

“…SNR, CSDT(g) = 1.5 bpcu SpaDCoM BMD, R = 1.5 bpcu Min. SNR, I∆(u|g) = 1.5 bpcu Pairwise Coded Modulation[23] Uniform BMD, R = 1.5 bpcu…”

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confidence: 99%

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Adaptive Coded Modulation for IM/DD Free-Space Optical Backhauling: A Probabilistic Shaping Approach

Elzanaty

Alouini

2020

IEEE Trans. Commun.

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In this paper, we propose a practical adaptive coding modulation scheme to approach the capacity of free-space optical (FSO) channels with intensity modulation/direct detection based on probabilistic shaping. The encoder efficiently adapts the transmission rate to the signal-to-noise ratio, accounting for the fading induced by the atmospheric turbulence. The transponder can support an arbitrarily large number of transmission modes using a low complexity channel encoder with a small set of supported rates. Hence, it can provide a solution for FSO backhauling in terrestrial and satellite communication systems to achieve higher spectral efficiency. We propose two algorithms to determine the capacity and capacity-achieving distribution of the scheme with unipolar M-ary pulse amplitude modulation (M-PAM) signaling. Then, the signal constellation is probabilistically shaped according to the optimal distribution, and the shaped signal is channel encoded by an efficient binary forward error correction scheme. Extensive numerical results and simulations are provided to evaluate the performance. The proposed scheme yields a rate close to the tightest lower bound on the capacity of FSO channels. For instance, the coded modulator operates within 0.2 dB from the M-PAM capacity, and it outperforms uniform signaling with more than 1.7 dB, at a transmission rate of 3 bits per channel use.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%