Solution for error propagation in a NOMA-based VLC network: symmetric superposition coding

Li, Haoyue; Huang, Zhitong; Xiao, Yu; Zhan, Shuang; Ji, Yuefeng

doi:10.1364/oe.25.029856

Cited by 39 publications

(23 citation statements)

References 11 publications

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“…Since only the bit-to-symbol mapping is scrambled after CCT and the inverse CCT process can always be successfully performed as long as users have the correct keys, it is believed that error propagation of SIC decoding only affects the demodulation of QAM symbols, which has no effect on the decryption (i.e., inverse CCT) process. For simplicity and without loss of generality, we consider perfect SIC in this work, considering that the error propagation effect can be efficiently eliminated by using symmetric superposition coding [12] or constellation partitioning coding [13].…”

Section: System Modelmentioning

confidence: 99%

“…Due to its high spectral efficiency, NOMA has also been applied for capacity improvement in multi-user VLC systems [7][8][9]. So far, efforts have been made to improve the performance of NOMA VLC systems, for example, the optimization of user grouping and power allocation [10], the combination of NOMA with orthogonal frequency division multiplexing access (OFDMA) [11], the mitigation of error propagation in NOMA [12,13], the application of NOMA in MIMO-VLC systems [14], etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Secure and private NOMA VLC using OFDM with two-level chaotic encryption

Yang¹,

Chen²,

Zhang³

et al. 2018

Opt. Express

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In this paper, we propose and demonstrate a secure and private non-orthogonal multiple access (NOMA) based visible light communication (VLC) system. Orthogonal frequency division multiplexing (OFDM) modulation is applied in the system and a two-level chaotic encryption scheme is further implemented, which can guarantee both the security of legitimate users against eavesdroppers and the privacy among all the legitimate users. An experimental demonstration with two legitimate users and one eavesdropper successfully verifies the feasibility of the proposed secure and private NOMA VLC system. To the best of our knowledge, it is the first time that simultaneous security and privacy improvement is considered for NOMA VLC systems.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Secure and private NOMA VLC using OFDM with two-level chaotic encryption

Yang¹,

Chen²,

Zhang³

et al. 2018

Opt. Express

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show abstract

“…However, in traditional SIC, the proceeding error decision of the high power user will cause the deterioration of the subsequent detection performance. To solve this problem, a symmetric superposition coding (SSC) and symmetric SIC (SSIC) decoding scheme are proposed to overcome the error propagation (EP) problem for downlink NOMA-based VLC network [21]. Based on [21], a bandwidth compression-symmetrical coding NOMA (BC-SCNOMA) system is proposed in [22], which benefits the BER performance of low power users.…”

Section: Introductionmentioning

confidence: 99%

The Performance Analysis of Downlink NOMA in LEO Satellite Communication System

2020

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Non-orthogonal multiple access (NOMA) has the potential to provide higher throughput than conventional orthogonal multiple access (OMA), which has been considered as a key technology for 5G. NOMA in satellite communication system can provide anytime, anywhere access with improved spectral efficiency and system capacity because of its ubiquitous coverage. However, the characteristics of the satellite channels are different from that of the terrestrial network, i.e., huge time delay and Doppler shift. In this paper, different from the existing works, which mainly focus on the performance of NOMA in static terrestrial base stations and Geostationary orbit (GEO) scenarios, we investigate the performance analysis of downlink NOMA in dynamic low earth orbit (LEO) satellite communication system with Doppler shift considered. We combine NOMA and orthogonal frequency division multiplexing (OFDM) for better spectral efficiency. Our channel model includes both small scale model and large scale model. For simplify, we only consider two users in one spot beam. Besides, we express the performance analysis of downlink NOMA in LEO satellite communication system, like ergodic capacity, outage probability (OP) and mutual information. However, in traditional NOMA scheme, the proceeding error decision of the high power user will cause the deterioration of the subsequent detection performance. Therefore, a symmetrical coding (SC) scheme for different modulation mode is proposed for low power users to get better performance. Finally, simulation results validate the performance of the NOMA scheme is better than that of the OMA scheme. The proposed SC scheme can achieve a prominent increase performance contrasted to the traditional NOMA scheme. INDEX TERMS LEO satellite communication system, NOMA, ergodic capacity, outage probability, mutual information, symmetrical coding scheme. AIJUN LIU (Member, IEEE) received the B.S. degree in microwave communications and the M.S. and Ph.D. degrees in communications engineering and information systems from the College of Communications Engineering, Army Engineer

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“…The error propagation issue is particularly severe for VLC since it generally suffers from the high-frequency fading [17]. Some works focusing on eliminating the error propagation have been investigated in NOMA-VLC system [18,19]. In [18], symmetric superposition coding (SSC) and symmetric SIC decoding are proposed in downlink NOMA system, which can eliminate 90% demodulation errors caused by error propagation.…”

Section: Introductionmentioning

confidence: 99%

“…Some works focusing on eliminating the error propagation have been investigated in NOMA-VLC system [18,19]. In [18], symmetric superposition coding (SSC) and symmetric SIC decoding are proposed in downlink NOMA system, which can eliminate 90% demodulation errors caused by error propagation. In [19], a novel NOMA scheme based on constellation partitioning coding (CPC) and uneven constellation de-mapping (UCD) for downlink VLC is proposed.…”

Section: Introductionmentioning

confidence: 99%

Performance-enhanced NOMA-VLC using subcarrier pairwise coding

Shi

Hong

et al. 2019

Optics Communications

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To alleviate the error propagation issue of non-orthogonal multiple access (NOMA) based visible light communication (VLC) systems, we propose and experimentally demonstrate the subcarrier pairwise coding (PWC) based NOMA-VLC. Without extra coding overhead, the computation-efficient subcarrier PWC can significantly improve the overall system performance by pairing the subcarriers of high signal-to-noise ratios (SNRs) with those of low SNRs. Under different transmitted baud rate from 150 MSa/s to 225 MSa/s, the bit error rate (BER) performance with and without PWC is investigated in a NOMA-VLC system. Experimental results show that with the optimized power ratio between the NOMA users, up to 3.3-dB Q 2-factor improvement can be achieved by the proposed scheme.

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Solution for error propagation in a NOMA-based VLC network: symmetric superposition coding

Cited by 39 publications

References 11 publications

Secure and private NOMA VLC using OFDM with two-level chaotic encryption

Secure and private NOMA VLC using OFDM with two-level chaotic encryption

The Performance Analysis of Downlink NOMA in LEO Satellite Communication System

Performance-enhanced NOMA-VLC using subcarrier pairwise coding

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