| 软件无线电中的多频段信号带通采样 |
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| 引用本文： | 池琛,张彧,杨知行.软件无线电中的多频段信号带通采样[J].清华大学学报(自然科学版),2009(8). |
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| 作者姓名： | 池琛 张彧 杨知行 |
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| 作者单位： | 清华大学电子工程系微波与数字通信技术国家重点实验室; |
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| 基金项目： | 国家“八六三”高技术项目(2007AA01Z2b6) |
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| 摘 要： | 针对软件无线电(SDR)技术中的多频段信号带通均匀采样技术,提出了一种能够高效、准确地求解最小采样频率的方法。该方法从理论上可能的最小采样频率出发,根据采样后频谱不发生混叠的3种约束条件来确定可变的频率步长,搜索可用的最小频率。在求解过程中同时考虑到采样后频谱之间的保护带宽。具体的工程算例表明采用该方法能够快速准确地计算出最小采样频率。与其他方法相比,该方法计算复杂度较低,能够避免频谱倒置的情况,并且可以兼顾频谱间的保护间隔。
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| 关 键 词： | 软件无线电 带通均匀采样 多频段信号 保护带宽 |
Bandpass sampling of multiband signals in software defined radio |
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| CHI Chen,ZHANG Yu,YANG Zhixing.Bandpass sampling of multiband signals in software defined radio[J].Journal of Tsinghua University(Science and Technology),2009(8). |
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| Authors: | CHI Chen ZHANG Yu YANG Zhixing |
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| Institution: | State Key Laboratory of Microwave and Digital Communication;Department of Electronic Engineering;Tsinghua University;Beijing 100084;China |
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| Abstract: | An efficient method is presented to find the minimum valid sampling frequency for bandpass sampling of multiband signals in software defined radio(SDR) technology.The method starts with the theoretically minimum frequency and searches for the minimum valid sampling frequency using variable step sizes subject to three non-aliasing constraints.The guard-bands between the downconverted signal spectra are analyzed to determine the minimum sampling frequency.An example illustrates that the minimum valid frequenc... |
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| Keywords: | software defined radio uniform bandpass sampling multiband signals guard-bands |
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