28 GHz Band Direct RF Undersampling Broadband Receiver for Ka-Band HTS On-Board Unit
28 GHz Band Direct RF Undersampling Broadband Receiver for Ka-Band HTS On-Board Unit
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适用于 Ka 频段 HTS 板载单元的 28 GHz 频段直接射频欠采样宽带接收器
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
N. Suematsu
中科院分区：
文献类型：
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作者：
Tomoyuki Furuichi;Yang Gui;M. Motoyoshi;S. Kameda;N. Suematsu
直接射频欠采样是实现高温超导机载装置小型化的有效技术。理论上可以实现采样频率fs/2的一半的接收带宽。但是，如果它将接收带宽扩展到fs/2，则抗混叠滤波器的滚降部分会严重影响折叠噪声。在本文中，我们提出了一种新的宽带折叠噪声模型，考虑了抗混叠滤波器的滚降部分。基于该模型，设计并评估了28ghz频段直接射频欠采样宽带接收机。因此，接收带宽达到fs/2的94%。
Direct RF undersampling is an effective technique for miniaturization of HTS on-board unit. It can realize a reception bandwidth up to half of the sampling frequency fs/2 theoretically. However, if it expands reception bandwidth until fs/2, roll-off part of an anti-aliasing filter effects seriously on folding noise. In this paper, we propose a new folding noise model for broadband considering a roll-off part of an anti-aliasing filter. Based on the proposed model, 28 GHz band direct RF undersampling broadband receiver is designed and evaluated. As a result, the reception bandwidth is achieved 94% of fs/2.