预调制多陪集采样系统
TN911; 目前,压缩采样系统主要有随机解调器、调制宽带转换器和多陪集采样3种,其中,多陪集采样的系统框架简单、重构成功率高,但用硬件实现时面临两个难题,一是低速模数转换器(ADC)的输入模拟带宽存在上限,二是难以实现各通道上的精准时延.借鉴调制宽带转换器在采样前先对输入信号进行预调制的思想,将预调制与多陪集采样结合,提出了预调制多陪集采样系统.采样前,在采样系统各通道上,由随机序列发生器产生周期单脉冲序列,对输入信号进行频谱调制以降低采样前信号的模拟带宽;然后,调制信号由低速ADC进行采样,且各通道上的低速ADC与随机序列发生器列共用同一个控制时钟;最后,采用多信号分类算法(MUSIC)算...
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| Published in | 电子技术应用 Vol. 48; no. 4; pp. 48 - 52 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Chinese |
| Published |
云南大学信息学院,云南昆明650500
2022
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| Subjects | |
| Online Access | Get full text |
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| Abstract | TN911; 目前,压缩采样系统主要有随机解调器、调制宽带转换器和多陪集采样3种,其中,多陪集采样的系统框架简单、重构成功率高,但用硬件实现时面临两个难题,一是低速模数转换器(ADC)的输入模拟带宽存在上限,二是难以实现各通道上的精准时延.借鉴调制宽带转换器在采样前先对输入信号进行预调制的思想,将预调制与多陪集采样结合,提出了预调制多陪集采样系统.采样前,在采样系统各通道上,由随机序列发生器产生周期单脉冲序列,对输入信号进行频谱调制以降低采样前信号的模拟带宽;然后,调制信号由低速ADC进行采样,且各通道上的低速ADC与随机序列发生器列共用同一个控制时钟;最后,采用多信号分类算法(MUSIC)算法近乎无失真地重构出输入信号.仿真实验结果表明,当以15％的奈奎斯特采样速率对输入信号进行压缩采样时,重构信号的均方误差仅为10-5量级.这验证了该采样系统的可行性,有效解决了多陪集采样系统的两个难题. |
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| AbstractList | TN911; 目前,压缩采样系统主要有随机解调器、调制宽带转换器和多陪集采样3种,其中,多陪集采样的系统框架简单、重构成功率高,但用硬件实现时面临两个难题,一是低速模数转换器(ADC)的输入模拟带宽存在上限,二是难以实现各通道上的精准时延.借鉴调制宽带转换器在采样前先对输入信号进行预调制的思想,将预调制与多陪集采样结合,提出了预调制多陪集采样系统.采样前,在采样系统各通道上,由随机序列发生器产生周期单脉冲序列,对输入信号进行频谱调制以降低采样前信号的模拟带宽;然后,调制信号由低速ADC进行采样,且各通道上的低速ADC与随机序列发生器列共用同一个控制时钟;最后,采用多信号分类算法(MUSIC)算法近乎无失真地重构出输入信号.仿真实验结果表明,当以15％的奈奎斯特采样速率对输入信号进行压缩采样时,重构信号的均方误差仅为10-5量级.这验证了该采样系统的可行性,有效解决了多陪集采样系统的两个难题. |
| Author | 柏正尧 黄振 |
| AuthorAffiliation | 云南大学信息学院,云南昆明650500 |
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| Author_FL | Huang Zhen Bai Zhengyao |
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| Author_xml | – sequence: 1 fullname: 黄振 – sequence: 2 fullname: 柏正尧 |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| Keywords | 压缩感知;多陪集采样;预调制;MUSIC算法;调制宽带转换器 |
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