LDPC-Coded CAP with Spatial Diversity for UVLC Systems over Generalized-Gamma Fading Channel

Jiang, Hongyan; Qiu, Hongbing; He, Ning; Zhao, Zhong-Qiu; Popoola, Wasiu O.; Ahmad, Zahir; Rajbhandari, Sujan

doi:10.3390/s20123378

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…The initial LLR of OOK is given by 2yI − I 2 /N 0 , where I is a constant corresponding to the fixed threshold value. PPM is a special case of (M, w) MPPM (i.e., w = 1), whose initial LLR is obtained by (17). As reported in other work, the uncoded OOK with a fixed threshold shows a high error floor in the turbulence channel [45].…”

Section: Resultsmentioning

confidence: 77%

“…In the simplification from ( 16) to (17), the absolute value of LLR is changed while its sign (plus or minus), which depends on the largest received slots and decides the bit, keeps the same due to monotonicity. Therefore, the simplification satisfies the requirement of the iterative soft decision but does not need CSI.…”

Section: Llr Calculationmentioning

confidence: 99%

“…Several turbulence mitigation techniques, such as channel coding [17], multi-hop relaying transmission [18], aperture averaging [19], and spatial diversity [20], were studied. Spatial diversity with linear combining at the receiver, such as equal gain combining (EGC) and maximum ratio combining (MRC), can effectively alleviate fading impairments.…”

Section: Introductionmentioning

confidence: 99%

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The BER Performance of the LDPC-Coded MPPM over Turbulence UWOC Channels

Jiang

Liao

et al. 2022

Photonics

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Turbulence-induced fading is a critical performance degrading factor for underwater wireless optical communication (UWOC) systems. In this paper, we propose a quasi-cyclic (QC) low-density parity-check (LDPC) code with multiple-pulse-position modulation (MPPM) to overcome turbulence-induced fading. MPPM is adopted as a compromise between the low-power efficiency of on–off keying (OOK) and the low bandwidth efficiency of pulse position modulation (PPM). The bit error rate (BER) performance of LDPC-coded MPPM over turbulence UWOC channels is investigated. The log-likelihood ratio (LLR) of MPPM is derived, and a simplified approximation is used for iterative decoding. Subsequently, the closed-form expression of the BER, without forward error correction (FEC) code, is obtained for the generalized-gamma (GG) fading model. Finally, Monte-Carlo (MC) simulation results are provided to demonstrate the correctness of the derived closed-form expressions and the effectiveness of the LDPC code with simplified LLR to improve the BER performance for different MPPM formats over fading channels.

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Section: Resultsmentioning

confidence: 77%

Section: Llr Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The BER Performance of the LDPC-Coded MPPM over Turbulence UWOC Channels

Jiang

Liao

et al. 2022

Photonics

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“…The last three papers are devoted to applications of VLC within underwater optical communications (UWOC) and vehicular communications. H. Jiang et al [20], in the paper on "LDPC-Coded CAP with Spatial Diversity for underwater visible-light communication (UVLC) Systems over Generalized-Gamma Fading Channel", propose a low-density parity-check (LDPC)-coded CAP modulation with spatial diversity, to mitigate turbulence-induced fading in a UVLC channel. Authors derive an approximated bit-error rate (BER) for the CAP modulation scheme, with a spatial diversity and equal-gain combination.…”

mentioning

confidence: 99%