现代防御技术 ›› 2018, Vol. 46 ›› Issue (5): 46-51.DOI: 10.3969/j.issn.1009-086x.2018.05.08

• 导航、制导与控制 • 上一篇    下一篇

宽频带级联数字下变频实现方法

欧春湘1, 杨嘉伟2   

  1. 1.北京遥感设备研究所,北京 100854;
    2.中国航天科工集团有限公司 第二研究院,北京 100854
  • 收稿日期:2017-09-28 修回日期:2018-01-18 出版日期:2018-10-30 发布日期:2020-11-25
  • 作者简介:欧春湘(1988-),女,江西赣州人。工程师,博士生,主要研究方向为基带信号处理。通信地址:100854 北京市142信箱205分箱 E-mail:ou_0330@163.com

Method of Wide Band Concatenated Digital Down Conversion

OU Chun-xiang1, YANG Jia-wei2   

  1. 1. Beijing Institute of Remote Sensing Equipment,Beijing 100854,China;
    2. The Second Research Academy of CASIC,Beijing 100854,China
  • Received:2017-09-28 Revised:2018-01-18 Online:2018-10-30 Published:2020-11-25

摘要: 在跳频通信系统中,接收机需要在取样带宽内实时地监测和复现当前的跳频频点,再对高频率的跳频信号进行下变频。针对快跳频、宽频带的跳频通信系统,提出了一种宽频带级联数字下变频方法,该方法包括信道化和复数下变频2个过程。信道化结构实现各分析信道的基带下变频,该过程相对独立,不参与频偏补偿,进而降低了级联数字下变频结构的反馈复杂度。复数下变频过程进一步将位于物理信道的信号搬至基带,该过程在低速率下完成若干固定频率的二次下变频,便于进行频偏补偿。通过仿真可知,该方法能够实时地实现数字下变频过程,该跳频通信系统在Eb/N0等于12 dB时误码率小于10-6

关键词: 信道化, 宽频带, 数字下变频, 跳频, 复数下变频, 误码率

Abstract: In the frequency hopping communication system, the receiver should supervise and copy the hopping frequency in the sample frequency band width timely to accomplish the digital down conversion. A method of wide band concatenated digital down conversion is proposed. The method includes two processes, channelization and the plurality down conversion. The channelization is independent and not related to the frequency offsets compensation so the whole system is less complex. The plurality down conversion is accomplished in low frequency and convenient for the frequency offsets compensation. The simulation result shows that the down conversion can be accomplished timely and the bit error rate is lower than 10-6 when the Eb/N0 equals to 12 dB.

Key words: channelization, wide band, digital down conversion, frequency hopping, plurality down conversion, bit error rate

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