Protograph LDPC-Coded BICM-ID With Irregular CSK Mapping in Visible Light Communication Systems

Dai, Lin; Fang, Yi; Yang, Zhaojie; Chen, Pingping; Li, Yonghui

doi:10.1109/tvt.2021.3106053

Cited by 56 publications

(15 citation statements)

References 22 publications

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“…LDPC codes are state-of-the-art error correcting codes [12,13] and appear in several international communication standards. In 2017, two new LDPC codes were introduced in the CCSDS TC recommendation [5], with parameters (128, 64) and (512, 256), respectively.…”

Section: Ldpc Codesmentioning

confidence: 99%

Next generation earth-to-space telecommand coding and synchronization: ground system design, optimization and software implementation

Abello

Baldi

Carvalho

et al. 2021

J Wireless Com Network

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The Consultative Committee for Space Data Systems, followed by all national and international space agencies, has updated the Telecommand Coding and Synchronization sublayer to introduce new powerful low-density parity-check (LDPC) codes. Their large coding gains significantly improve the system performance and allow new Telecommand services and profiles with higher bit rates and volumes. In this paper, we focus on the Telecommand transmitter implementation in the Ground Station baseband segment. First, we discuss the most important blocks and we focus on the most critical one, i.e., the LDPC encoder. We present and analyze two techniques, one based on a Shift Register Adder Accumulator and the other on Winograd convolution both exploiting the block circulant nature of the LDPC matrix. We show that these techniques provide a significant complexity reduction with respect to the usual encoder mapping, thus allowing to obtain high uplink bit rates. We then discuss the choice of a proper hardware or software platform, and we show that a Central Processing Unit-based software solution is able to achieve the high bit rates requested by the new Telecommand applications. Finally, we present the results of a set of tests on the real-time software implementation of the new system, comparing the performance achievable with the different encoding options.

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Section: Ldpc Codesmentioning

confidence: 99%

Next generation earth-to-space telecommand coding and synchronization: ground system design, optimization and software implementation

Abello

Baldi

Carvalho

et al. 2021

J Wireless Com Network

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show abstract

“…Although multi-carrier DCSK (MC-DCSK) can eliminate the ISI component, the predefined subcarrier which is used to transmit the chaotic reference sequence will make the sacrifice of spectral efficiency [6]. Some scholars proposed that the transmission reliability of DCSK systems could be significantly improved by using error-correction codes, especially LDPC codes [7][8][9]. However, LDPC coding module will increase the complexity of the hardware and software system.…”

Section: Introductionmentioning

confidence: 99%

Phase‐index correlation delay shift keying modulation

Duan

Yang

2022

IET Communications

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High-data-rate phase-orthogonality correlation-delay-shift-keying (HPO-CDSK) transmits 2-bits orthogonal signal in parallel and achieve higher spectral efficiency in the category of non-coherent detection chaotic systems. However, the spectral efficiency gain mainly relies on the sacrifice of energy efficiency. The study of HPO-CDSK is extended and phase-index CDSK (PI-CDSK) is proposed. By virtue of index modulation (IM) technology in PI-CDSK, according to the index bit, the orthogonal phase is used to distinguish the active carrier which bears the information bit. Since two bits (including index bit and information bit) are borne in one carrier, compared with HPO-CDSK, PI-CDSK can achieve double energy efficiency gain. Moreover, PI-CDSK can decrease noise interference and eliminate the intra-signal interference (ISI) component in demodulation. Results show that, with the same energy efficiency, PI-CDSK has better bit-error rate (BER) performance than that of CDSK, DCSK and their improved schemes.

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“…It has many advantages such as high anti-electromagnetic interference, low cost, good safety, and a rich and license-free spectrum. Compared with the single carrier modulation schemes, the optical orthogonal frequency division multiplexing (O-OFDM), which has a higher spectral efficiency and system capacity, attracted more and more attention from scholars [3][4][5]. Combining the low-cost structure of intensity modulation and direct detection (IM/DD), the direct current-biased (DC) O-OFDM has been widely deployed in the VLC system to achieve a high-speed rate [6], where the Hermitian symmetry is adopted to provide the real-valued signal and the DC bias is used to ensure the non-negativity constraint of light-emitting diode (LED).…”

Section: Introductionmentioning

confidence: 99%

Study of the Performance of Deep Learning-Based Channel Equalization for Indoor Visible Light Communication Systems

et al. 2021

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The inherent impairments of visible light communication (VLC) in terms of nonlinearity of light-emitting diode (LED) and the optical multipath restrict bit error rate (BER) performance. In this paper, a model-driven deep learning (DL) equalization scheme is proposed to deal with the severe channel impairments. By imitating the block-by-block signal processing block in orthogonal frequency division multiplexing (OFDM) communication, the proposed scheme employs two subnets to replace the signal demodulation module in traditional system for learning the channel nonlinearity and the symbol de-mapping relationship from the training data. In addition, the conventional solution and algorithm are also incorporated into the system architecture to accelerate the convergence speed. After an efficient training, the distorted symbols can be implicitly equalized into the binary bits directly. The results demonstrate that the proposed scheme can address the overall channel impairments efficiently and can recover the original symbols with better BER performance. Moreover, it can still work robustly when the system is complicated by serious distortions and interference, which demonstrates the superiority and validity of the proposed scheme in channel equalization.

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Protograph LDPC-Coded BICM-ID With Irregular CSK Mapping in Visible Light Communication Systems

Cited by 56 publications

References 22 publications

Next generation earth-to-space telecommand coding and synchronization: ground system design, optimization and software implementation

Next generation earth-to-space telecommand coding and synchronization: ground system design, optimization and software implementation

Phase‐index correlation delay shift keying modulation

Study of the Performance of Deep Learning-Based Channel Equalization for Indoor Visible Light Communication Systems

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