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中文摘要：
传统的数字下变频结构只能处理特定频点一定带宽的带通信号，无法满足频段宽带卫星通信中任意带通信号的高效数字下变频。分析了多通道数字下变频高效的原因，提出了一种针对非固定频点的宽带数字下变频高效结构；该结构将本振信号作用于多相滤波器组中，实现了非固定频点带通信号的高效数字下变频。仿真证明，该方案可以有效的实现非固定频点带通信号的高效数字下变频。
英文摘要：
The traditional efficient architecture for wideband digital down conversion can only handle band pass signal on features points and wideband, without realizing high efficiency digital down conver- sion under arbitrary band pass signal. Based on the theory of traditional multi-channel digital down con- version, the fundamental reason for high efficiency is analyzed and efficient architecture for wideband dig- ital down conversion with unfixed frequency point is put forward. With local signal acting on the filter, this structure realizes high efficiency digital down conversion under the circumstance of unfixed frequency point and band pass signal. The simulation shows that this scheme can effectively realize high efficiency digital down conversion under the circumstance of unfixed frequency point and band pass signal.
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