The digital television terrestrial broadcasting (DTTB) system is one of the most important wireless broadcasting systems, but its indoor coverage performance is not satisfactory enough. The visible light communication (VLC) system works well for indoor scenarios and becomes a quite appealing technology that can realize indoor wireless communications. In this paper, we propose a hybrid system called the radio-optics hybrid single frequency network (SFN) with wide and reliable coverage for DTTB. The current SFN structure of DTTB is maintained, while the optical signal within visible wavelength is adopted to achieve seamless connection between outdoor and indoor. Based on the identical intermediate frequency, the hybrid receiver with antennas and photodiodes can not only receive radio and optical signals individually or simultaneously, but also combine the received signals from different transmitters in the analog/digital domain with various combination methods. The feasibility of the radio-optics hybrid system is verified by the experiment implemented in the laboratory. Furthermore, the proposed hybrid system has great potential to improve other extended applications of DTTB, including positioning, interactivity, scalable video coding, etc.

中文翻译：

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用于 DTTB 的无线电光学混合单频网络：原理、技术和实践

数字电视地面广播（DTTB）系统是最重要的无线广播系统之一，但其室内覆盖性能还不够理想。可见光通信（VLC）系统适用于室内场景，成为实现室内无线通信的一项颇具吸引力的技术。在本文中，我们提出了一种称为无线电光混合单频网络 (SFN) 的混合系统，它具有广泛而可靠的 DTTB 覆盖范围。保持现有DTTB的SFN结构，同时采用可见光波长范围内的光信号，实现室外与室内的无缝连接。基于相同的中频，带有天线和光电二极管的混合接收机不仅可以单独或同时接收无线电和光信号，还可以将来自不同发射机的接收信号在模拟/数字域中使用各种组合方法进行组合。通过实验室实施的实验验证了无线电光学混合系统的可行性。此外，所提出的混合系统在改进 DTTB 的其他扩展应用方面具有巨大潜力，包括定位、交互性、可伸缩视频编码等。