Broadcasting and broadband network is moving towards integration and LTE-based 5G terrestrial broadcast is now researched in Release 16 in Third Generation Partnership Project (3GPP) standardization meetings. However, the work scope of LTE-based 5G terrestrial broadcast focuses on specifying new numerologies and some minor improvement on cell acquisition subframe, which is insufficient. In this paper, limitations in coding and modulation schemes of LTE-based 5G terrestrial broadcast system, e.g., Turbo codes and Quadrature Amplitude Modulation (QAM), are detailedly analyzed. To further enhance the spectrum efficiency of LTE-based 5G terrestrial broadcast system, LDPC (Low Density Parity Check) codes from 5G new radio (NR) standard and newly designed non-uniform constellations (NUCs) are adopted in this paper to replace Turbo codes and QAM respectively. Extensive simulations and complexity analysis show that the proposed LDPC coding and NUC modulation scheme, either standalone or combined, can provide significant performance gain over Additive White Gaussian Noise (AWGN) and Tapped Delayline (TDL) channels, without additional complexity. To summarize, this paper investigates the weakness of the coding and modulation schemes in current systems and provides potential alternatives for the enhanced future broadcast in 3GPP standard.

中文翻译：

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基于 LTE 的 5G 地面广播系统的编码和调制方案的增强

广播和宽带网络正在走向集成，基于 LTE 的 5G 地面广播现在正在第三代合作伙伴计划 (3GPP) 标准化会议的第 16 版中进行研究。然而，基于LTE的5G地面广播的工作范围侧重于指定新的数字学和对小区捕获子帧的一些小改进，这是不够的。在本文中，详细分析了基于 LTE 的 5G 地面广播系统的编码和调制方案的局限性，例如 Turbo 码和正交调幅 (QAM)。为进一步提升基于 LTE 的 5G 地面广播系统的频谱效率，本文采用来自 5G 新无线电 (NR) 标准的 LDPC（低密度奇偶校验）码和新设计的非均匀星座（NUC）分别代替 Turbo 码和 QAM。广泛的模拟和复杂性分析表明，所提出的 LDPC 编码和 NUC 调制方案，无论是独立的还是组合的，都可以提供比加性高斯白噪声 (AWGN) 和抽头延迟线 (TDL) 信道显着的性能增益，而不会增加复杂性。总而言之，本文研究了当前系统中编码和调制方案的弱点，并为 3GPP 标准中增强的未来广播提供了潜在的替代方案。与加性高斯白噪声 (AWGN) 和抽头延迟线 (TDL) 通道相比，可以提供显着的性能增益，而不会增加复杂性。总而言之，本文研究了当前系统中编码和调制方案的弱点，并为 3GPP 标准中增强的未来广播提供了潜在的替代方案。与加性高斯白噪声 (AWGN) 和抽头延迟线 (TDL) 通道相比，可以提供显着的性能增益，而不会增加复杂性。总而言之，本文研究了当前系统中编码和调制方案的弱点，并为 3GPP 标准中增强的未来广播提供了潜在的替代方案。