自适应干扰抵消系统中射频模块关键技术研究

发布时间：2019-01-02 13:14

【摘要】：随着社会科技的进步,无线通信技术越来越广泛的应用在社会的各个领域。无线信道内信号的传输越来越拥挤,相互之间的电磁干扰也越来越强烈。尤其是在几十MHz到几百MHz的频段,信道绝对带宽相对与微波来说很窄,但大量的无线通信设备工作在这个频段,这进一步加剧了各信号之间的相互干扰。在跳频通信中采用自适应干扰和噪声抵消技术是解决此电磁兼容问题的一种有效方法,这在国内外多种干扰抵消装置中得到了充分的证明。首先本文介绍了自适应干扰抵消系统的研究背景和意义,国内外自适应干扰抵消系统研究进展以及自适应干扰抵消系统的整体概述,并对自适应滤波器进行相关介绍,自适应干扰抵消系统是自适应滤波器的一种具体应用。对带状线定向耦合器在各频段下的应用可行性进行分析,主要从三个方面入手：首先对器件小型化进行研究,通过折叠带状线并且采用不平衡式的交叉级联的方式减小器件体积,通过提高介电常数减小带线的电长度,改变介质板与两侧基板的厚度来控制器件的耦合度,通过仿真验证器件实施可行性；其次,对器件相位平衡度进行深入研究,提出一种解决交叉级联带状线定向耦合器相位平衡度的方法,经验证圆满的解决了高频段相位偏移问题；最后,提出一种减小四分之一波长带状线耦合器输入驻波比的方法,通过对各级四分之一波长连接线处采用渐变线的方式减小信号反射,提高器件功率容量,并对以后可能的改进方案进行分析,即完全采用渐变线的形式设计超宽带带状线耦合器。本文通过仿真0.7CHz～2.7GHz超宽带带状线耦合器来验证上述三个观点。对电调衰减器各模块电路进行分析,设计并实现一种超宽带大功率电调衰减器电路,并对衰减器实物的衰减幅频特性与相频特性进行测试。
[Abstract]:With the progress of social science and technology, wireless communication technology is more and more widely used in various fields of society. The transmission of signals in wireless channels is becoming more and more crowded, and the electromagnetic interference between each other is becoming more and more intense. Especially in the frequency band of dozens of MHz to several hundred MHz, the absolute bandwidth of the channel is relatively narrow to that of microwave, but a large number of wireless communication devices work in this band, which further intensifies the mutual interference between the signals. Adaptive interference and noise cancellation technology is an effective method to solve this EMC problem in frequency hopping communication, which has been fully proved in many kinds of interference cancellation devices at home and abroad. Firstly, this paper introduces the research background and significance of adaptive interference cancellation system, the research progress of adaptive interference cancellation system at home and abroad, and the overall overview of adaptive interference cancellation system, and introduces the adaptive filter. Adaptive interference cancellation system is a specific application of adaptive filter. The feasibility of the application of the strip line directional coupler in each frequency band is analyzed, which is mainly from three aspects: firstly, the miniaturization of the device is studied. The coupling degree of the device is controlled by folding strip lines and adopting unbalanced cross cascade to reduce the volume of the device, and by increasing the dielectric constant to reduce the electric length of the band line and changing the thickness between the dielectric plate and the two sides of the substrate, the coupling degree of the device is controlled by changing the thickness of the dielectric plate and the two sides of the substrate. The feasibility of device implementation is verified by simulation. Secondly, the phase balance of the device is studied in depth, and a method to solve the phase balance of cross-cascade banded line directional coupler is proposed, which is proved to be a satisfactory solution to the problem of phase offset in high frequency band. Finally, a method of reducing the input standing wave ratio of 1/4 wavelength band line coupler is proposed. The signal reflection is reduced by using the gradual change line at the 1/4 wavelength connecting line at all levels, and the power capacity of the device is improved. The possible improvement scheme is analyzed, that is, the UWB strip coupler is designed in the form of gradient line. This paper verifies the above three viewpoints by simulating 0.7CHz~2.7GHz UWB strip coupler. This paper analyzes the various modules of the electrically modulated attenuator, designs and implements an ultra-wideband and high-power electric attenuator circuit, and tests the attenuation amplitude-frequency and phase-frequency characteristics of the attenuator.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN972

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