Spatially Adaptive TV Broadcast System: Hardware in the Loop Operational Analysis
Spatially Adaptive TV Broadcast System: Hardware in the Loop Operational Analysis
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DOI：
10.1109/tbc.2017.2665706
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发表时间：
2018-03
影响因子：
4.5
通讯作者：
P. Bagot;M. Beach;A. Nix;J. McGeehan;J. Boyer
中科院分区：
文献类型：
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作者：
P. Bagot;M. Beach;A. Nix;J. McGeehan;J. Boyer
当数字电视系统的操作远远超过操作阈值时，由于数字电视的硬故障特征，对用户或广播公司都没有明显的优势。在数字网络中，该阈值可能会因传播介质和用户接收设备的变化而变化，从而需要足以覆盖所有传播和设备变化的发射功率裕度。因此，如果系统能够自适应地调整到略高于阈值运行，那么就可以节省大量的能源。通过半实物分析对空间自适应系统进行评估；使用信道仿真器对阵列增益和衰落条件进行物理建模，并构建反馈节点，允许根据评估用户反馈来操纵广播功率。对这种系统在英国数字地面电视(DTT)网络上的效果进行了评估，其优点突出了可获得高达2.1分贝的潜在功率节约。这相当于每年减少3300万至5800万千瓦时的电力，节省350万至610万GB(440万至760万美元)，并减少1370万至2400万二氧化碳的排放。因此，本文以英国为例说明了DTT网络的潜在节能效果。
When a digital TV system is operating far in excess of the operational threshold, there is no discernible advantage to either the user or broadcaster due to the hard failure characteristics of digital TV. In a digital network, this threshold can vary due to changes in the propagation medium and user receiving equipment, necessitating a transmit power margin sufficient to cover all propagation and equipment variations. Hence if the system could be adaptively tuned to operate at just above the threshold, then significant energy savings could be made. A spatially adaptive system was evaluated through hardware-in-the-loop analysis; here a channel emulator was used to physically model array gain and fading conditions, and feedback nodes were constructed allowing broadcast powers to be manipulated based on evaluating user feedback. The effects of such a system on the U.K. Digital terrestrial television (DTT) network were evaluated and the advantages highlighted potential power savings of up to 2.1 dB being obtainable. This equates to an electricity reduction of between 33 million and 58 million kWh per year, saving between £3.5 million and £6.1 million ($4.4 million and $7.6 million) and reducing carbon emissions by between 13.7 million and 24 million CO2e. This paper thus illustrates the potential energy savings for a DTT network, using the U.K. as a worked example.