Eight-state trellis-coded optical modulation with signal constellations of four-dimensional M-ary quadrature-amplitude modulation

Ishimura, Shota; Kikuchi, K.

doi:10.1364/oe.23.006692

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…In the typical 8 or 16 coding, the digital signals are obtained by controlling the phase and amplitude modulations, as used in phase-shift keying (PSK)30 and quadrature amplitude modulation (QAM)31. In the polarized-controlled SPPAM, the modulated signals can be encoded with the polarization states such that the allowable symbols may increase beyond the sub-wavelength optical applications.…”

Section: Discussionmentioning

confidence: 99%

Miniature Surface Plasmon Polariton Amplitude Modulator by Beat Frequency and Polarization Control

Chang

Lin

et al. 2016

Sci Rep

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The miniaturization of modulators keeps pace for the compact devices in optical applications. Here, we present a miniature surface plasmon polariton amplitude modulator (SPPAM) by directing and interfering surface plasmon polaritons on a nanofabricated chip. Our results show that this SPPAM enables two kinds of modulations. The first kind of modulation is controlled by encoding angular-frequency difference from a Zeeman laser, with a beat frequency of 1.66 MHz; the second of modulation is validated by periodically varying the polarization states from a polarization generator, with rotation frequencies of 0.5–10 k Hz. In addition, the normalized extinction ratio of our plasmonic structure reaches 100. Such miniaturized beat-frequency and polarization-controlled amplitude modulators open an avenue for the exploration of ultrasensitive nanosensors, nanocircuits, and other integrated nanophotonic devices.

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Section: Discussionmentioning

confidence: 99%

Miniature Surface Plasmon Polariton Amplitude Modulator by Beat Frequency and Polarization Control

Chang

Lin

et al. 2016

Sci Rep

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“…A widespread realization of MLSD is achieved using the trellis or Viterbi decoder. For more efficient decoding, a specific designed trellis can be employed for both sides of transmission, i.e., as encoder and decoder [22][23][24]. The TCM serves then as an amplitude modulation.…”

Section: Trellis-coded Modulationmentioning

confidence: 99%

“…It has been employed to enhance OOK-based system in [21], and in [11] trellis-coded modulation was proposed in hybrid with color keying (CSK). Trellis-or Viterbi-based coding is also found in researches on fiber optic [22][23][24] and free space optic [25], specifically for signal detection.…”

Section: Introductionmentioning

confidence: 99%

Performance of signal detection with trellis code for downlink non-orthogonal multiple access visible light communication

2022

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This paper examines the implementation of multi-level amplitude modulation enforced by trellis coding in a downlink non-orthogonal multiple access channel for visible light communication (VLC). The non-orthogonal transmission is applied using superposition coding and successive interference cancellation with the support of a trellis decoder. The VLC is addressed by a channel model according to Lambert. Two levels of maximum likelihood signal detection are observed and compared, each for corresponding 4 and 8 trellis-coded modulation (TCM). The power ratio allotment is examined to investigate the system performance in the bit error rate. The simulation showed that a threshold of power ratio is needed to ensure good performance of signal detection. Further simulation with successive detection had shown effective results for up to three users.

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“…• Trellis-coded modulation (TCM) [37], [40]: joint design of convolutional coding and modulation format via set partitioning etc. Concatenation with turbo decoding may be needed to approach capacity.…”

Section: B Coded Modulationmentioning

confidence: 99%

Iteration-Aware LDPC Code Design for Low-Power Optical Communications

Koike‐Akino

Millar

Kojima

et al. 2016

J. Lightwave Technol.

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Recent low-density parity-check (LDPC) codes have shown capacity-approaching performance for various communications systems. However, their promising performance cannot always be obtained due to practical constraints such as finite codeword length, finite iteration, finite memory, and finite precision. In this paper, we focus on a practical design method of highperformance LDPC codes under a constraint of finite-iteration decoding for low-power optical communications. We introduce an iteration-aware LDPC code design approach, which is based on decoding trajectory in extrinsic information transfer (EXIT) chart analysis. It is demonstrated that an LDPC code designed by the conventional curve-fitting method exhibits nearly 2 dB of penalty when the maximum number of iterations is limited. The results suggest that the LDPC code should be adaptively changed, e.g., when the number of decoding iterations is decreased to save power consumption. We also extend our design method to a multiobjective optimization concept by taking average degrees into account, so that the threshold and the computational complexity are minimized at the same time. The proposed Pareto-optimal codes can achieve additional 2 dB gain or 50% complexity reduction at maximum, in low-power decoding scenarios.

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Eight-state trellis-coded optical modulation with signal constellations of four-dimensional M-ary quadrature-amplitude modulation

Cited by 20 publications

References 9 publications

Miniature Surface Plasmon Polariton Amplitude Modulator by Beat Frequency and Polarization Control

Miniature Surface Plasmon Polariton Amplitude Modulator by Beat Frequency and Polarization Control

Performance of signal detection with trellis code for downlink non-orthogonal multiple access visible light communication

Iteration-Aware LDPC Code Design for Low-Power Optical Communications

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