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首页> 外文期刊>Wireless Communications Letters, IEEE >Video Multicast: Integrating Scalability of Soft Video Delivery Systems Into NOMA
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Video Multicast: Integrating Scalability of Soft Video Delivery Systems Into NOMA

机译：视频多播：将软视频传输系统的可伸缩性集成到NOMA中

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摘要

Non-orthogonal Multiple Access (NOMA) has aroused research interest for its potential use in future wireless video multicast. By exploring the power domain, multiple video layers are superposed to achieve video delivery scalability and efficiency in NOMA. However, the scalability of this approach is still limited despite adopting medium-grain quality scalable (MGS) video coding. In this letter, we propose a scalable multicast design inspired by soft video delivery systems. Soft video delivery systems cannot be directly applied in NOMA networks to improve the scalability because they cannot achieve errorless decoding when utilizing linear least square estimation (LLSE) at the decoder. If there is decoding error in the former layers, the successive interference cancellation (SIC) in NOMA will give rise to error propagation and huge performance loss. To solve this problem, we propose a design with digitalized base layer and soft encoded enhanced layer. The power allocation is formulated as a distortion minimization problem. The experimental results demonstrate that the proposed design has significant performance gain over SoftCast, SupCast and the traditional digital system.
机译：非正交多路访问（NOMA）由于其在未来的无线视频多播中的潜在用途而引起了研究兴趣。通过探索电源域，可以叠加多个视频层，以实现NOMA中视频交付的可扩展性和效率。但是，尽管采用了中等粒度质量可伸缩（MGS）视频编码，但此方法的可伸缩性仍然受到限制。在这封信中，我们提出了一种受软视频传输系统启发的可伸缩多播设计。软视频传送系统不能直接应用于NOMA网络以提高可伸缩性，因为当在解码器上利用线性最小二乘估计（LLSE）时，它们无法实现无差错解码。如果前一层存在解码错误，则NOMA中的连续干扰消除（SIC）将导致错误传播和巨大的性能损失。为了解决这个问题，我们提出了一种具有数字化基础层和软编码增强层的设计。功率分配被公式化为失真最小化问题。实验结果表明，与SoftCast，SupCast和传统数字系统相比，所提出的设计具有显着的性能提升。

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  • 来源
    《Wireless Communications Letters, IEEE》 |2019年第6期|1722-1726|共5页
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  • 作者单位

    Tongji Univ Coll Elect & Informat Engn Shanghai 201804 Peoples R China;

    Jinggangshan Univ Coll Elect & Informat Engn Jian 343009 Jiangxi Peoples R China;

    Tongji Univ Coll Elect & Informat Engn Minist Educ Embedded Syst & Serv Comp Key Lab Shanghai 201804 Peoples R China;

    Gannan Normal Univ Sch Math & Comp Sci Ganzhou 341000 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Soft video delivery; NOMA; wireless video transmission;

    机译：软视频传送;诺玛无线视频传输;

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