Underwater optical wireless communication (UOWC) is of great interest to the academic and industry community. In this article, we propose a low-complexity effective joint transmitter-side digital signal processing (DSP) including geometric shaping, time-domain tone reservation (TR), clipping. The peak-to-average power ratio reduction performance implementation complexity proposed TR are extensively analyzed. We then develop real-time 2.2-Gb/s system, which optimized for its shaping clipping...

In this paper, an offset QAM/OFDM combined with non-orthogonal multiple access (OQAM/OFDM-NOMA) modulation technique is proposed and experimentally demonstrated in a multi-user asynchronous multi-cell visible light communication (VLC) system. OQAM/OFDM-NOMA can effectively improve system capacity flexibility owing to non-requirement of cyclic prefix (CP) flexible power allocation strategies. We evaluate the performance comparison between conventional OFDM-NOMA VLC Each cell consists...

Probabilistically shaped orthogonal frequency-division multiplexing (PS-OFDM) signal is proposed and experimentally demonstrated in a low-cost intensity-modulation direct-detection (IM-DD) system for optical access networks. The concatenation of constant composition distribution matcher (CCDM) low-density parity-check (LDPC) code sequentially implements probabilistic amplitude shaping (PAS) channel coding. Thanks to the precoding scheme, all data subcarriers can be treated equally by one...

In this letter, probabilistic amplitude shaping (PAS) is performed in the case of orthogonal frequency division multiplexing (OFDM) by combining with circulant matrix transform (OCT) precoding. Thanks to precoding method, one optimized distribution globally implemented across 240 subcarriers merely matcher (DM). The proposed scheme for OFDM experimentally demonstrated a 64-ary quadrature modulation (QAM) W-band radio-over-fiber (RoF) system using direct-detection (DD), 20-km single-mode...

Recently, a metric called energy dispersion index (EDI) was proposed to qualitatively indicate the nonlinear interference (NLI) induced by correlated symbols during optical transmission. In this paper, we propose new shaper architecture decrease EDI of transmitted and thus, increase signal-to-noise ratio (SNR). We call list-encoding constant-composition distribution matcher (L-CCDM). L-CCDM consists an additional selecting module, which is compatible with standard probabilistic amplitude...

A bit-interleaved polar-coded modulation (BIPCM) scheme based on orthogonal circulant matrix transform (OCT) precoding is proposed and experimentally demonstrated in an frequency-division multiplexing (OFDM) visible light communication system. It exhibits the advantages of high reliability, low latency, computational complexity. To overcome fading effect a mapped bit-level, employs Monte Carlo method to jointly design polar code concatenated with 256-ary quadrature-amplitude modulation. In...

In the paper, bit-interleaved polar-coded modulation discrete multi-tone (DMT) (BIPCM-DMT) with 256-QAM enabled by constant amplitude zero auto-correlation (CAZAC) precoding is proposed and experimentally demonstrated in a low-cost intensity-modulation direct-detection (IM-DD) system. order to conquer fading effect on mapped bit-levels, two types of interleaver including quadratic polynomial permutation (QPP) random are compared optimize system performance. However, for BIPCM-DMT system,...

The stationary statistical properties of independent, identically distributed (i.i.d.) input symbols provide insights on the induced nonlinear interference (NLI) during fiber transmission. For example, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">kurtosis</i> is known to predict modulation format-dependent NLI. These can be used in design probabilistic amplitude shaping (PAS), which relies an shaper for increasing spectral efficiencies...

The deployment of non-binary pulse amplitude modulation (PAM) and soft decision (SD)-forward error correction (FEC) in future intensity-modulation (IM)/direct-detection (DD) links is inevitable.However, high-speed IM/DD suffer from inter-symbol interference (ISI) due to bandwidth-limited hardware.Traditional approaches mitigate the effects ISI are filters trellis-based algorithms targeting symbol-wise maximum a posteriori (MAP) detection.The former approach includes decision-feedback...

A spectral efficient light emitting diode (LED)-based visible communication (VLC) system adopting polar-coded 128 quadrature-amplitude modulations (QAM) orthogonal frequency division multiplexing (OFDM) is experimentally demonstrated. To overcome fading in the VLC system, an encoder-subcarrier mapping method proposed. The experimental results show that, at a sampling rate of AWG with 150 MSa/s, it can realize error-free transmission high-spectral efficiency (SE) up to 5.77 bit/s/Hz using...

A metric called exponentially-weighted energy dispersion index (EEDI) is proposed to explain the blocklength-dependent effective signal-to-noise ratio (SNR) in probabilistically shaped fiber-optic systems. EEDI better than (EDI) at capturing dependency of SNR on blocklength for long-distance transmission.

A new inter-frame polar coded modulation scheme is proposed and experimentally demonstrated in an infrared light communication (ILC) system. The utilizes the Monte Carlo (MC) method to jointly design code with 16-ary quadrature-amplitude (16QAM) orthogonal frequency-division multiplexing (OFDM). indoor transmission of 9.6 Gbit/s 16QAM OFDM signal achieved over a 3.2 km single-mode fiber 0.8 m free space. experiment results show that employing length 1024 cyclic redundancy check aided...

We study the effective SNR behavior of various enumerative amplitude shaping algorithms. show that their relative can be explained via temporal autocor-relation function or energy dispersion index.

The deployment of non-binary pulse amplitude modulation (PAM) and soft decision (SD)-forward error correction (FEC) in future intensity-modulation (IM)/direct-detection (DD) links is inevitable. However, high-speed IM/DD suffer from inter-symbol interference (ISI) due to bandwidth-limited hardware. Traditional approaches mitigate the effects ISI are filters trellis-based algorithms targeting symbol-wise maximum a posteriori (MAP) detection. former approach includes decision-feedback...

An architecture enabled by DFE is proposed to achieve reduced-state trellis-based algorithms for data center applications. Performance evaluation using PAM-4 IM/DD experimental shows that the penalty due state pruning below 0.5 dB, while a complexity reduction up 57% achieved.

A DFT-spread combined with pre-compensation scheme is proposed in 64QAM MB-OFDM UWBoF system. By using it, the simulation results show that transmission performance of system improves by 3.3dB compared to without and pre-compensation.

Some low-complexity LDPC decoders suffer from error floors. We apply iteration-dependent weights to the degree-3 variable nodes solve this problem. When 802.3ca EPON code is considered, an floor decrease of more than 3 orders magnitude achieved.