Low-Complexity Soft-Decision Viterbi Algorithm for IM/DD 56-Gb/s PAM-4 System

Rha, Hae Young; Moon, Sang Heup; Kang, Hyung Seok; Lee, Seung-Woo; Hwang, In-Ki; Lee, Joon Ki

doi:10.1109/lpt.2019.2893380

Cited by 7 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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

2022

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Furthermore, a simple equalizer is indispensable in the PAM-8 transmission to mitigate the inter symbol interference (ISI) [27]. Generally, feed-forward equalizer (FFE) is effective Mingyi Gao, Senior Member, IEEE, Mengli Liu, Junchi Ke and Bowen Chen MLSE algorithm with the soft decision was proposed for PAM-4 signal transmission [35]. Unfortunately, the computational complexity of MLSE is overwhelming and increases exponentially with the channel memory length.…”

Section: Introductionmentioning

confidence: 99%

Probabilistically Shaped PAM-8 Transmission With Simplified Volterra Equalizer

Gao

Liu

et al. 2022

IEEE Photonics J.

View full text Add to dashboard Cite

Intensity-modulation direct-detection (IM/DD) probabilistically shaped (PS) 8-level pulse-amplitude modulation (PAM) signal is promising for high-speed intra-data-center networks. However, the challenges of a PS-PAM-8 transmission system are complicated distribution matcher (DM) and nonlinear equalizer. In this work, we propose a simple PS-PAM-8 transmission system, where the probabilistic amplitude shaping (PAS) encoder consists of an energy-level-assigned (ELA)-based DM and a low-density parity-check (LDPC) encoder. In the ELA-based DM, a simple lookup table is designed to realize an approximate bilateral Maxwell-Boltzmann distribution by assigning energy levels to various symbols. Consequently, the DM encoded bits are used as the amplitude bits, and DM label bits and LDPC check bits are designated as sign bits to implement PAS encoding. In addition, a simplified Volterra equalizer (SVE) is introduced to eliminate the inter-symbol interference and improve the receiver sensitivity of PS-PAM-8 signal, where the SVE only includes the 2-order kernel to reduce its complexity. We experimentally demonstrated the proposed PS-PAM-8 scheme and verified its outperformance over uniform PAM-8 signal in the back-to-back and 2-km standard single mode fiber (SSMF) transmission. Compared to the conventional linear equalizer, the SVE contributes approximate 1-dB improvement of the receiver sensitivity in the PS-PAM-8 2-km SSMF transmission, for the error-free performance of post forward error correction bit error ratio.

show abstract

On Performance Limits for Spectrally Efficient Optical Transmission Techniques in Short-Haul Metro/Access Links

Foggi

2020

J. Lightwave Technol.

View full text Add to dashboard Cite

Low-Complexity Soft-Decision Viterbi Algorithm for IM/DD 56-Gb/s PAM-4 System

Cited by 7 publications

References 12 publications

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

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

Probabilistically Shaped PAM-8 Transmission With Simplified Volterra Equalizer

On Performance Limits for Spectrally Efficient Optical Transmission Techniques in Short-Haul Metro/Access Links

Contact Info

Product

Resources

About