Ku波段超宽带射频接收关键技术研究

发布时间：2018-03-16 16:00

本文选题：Ku波段　切入点：超外差接收机　出处：《东南大学》2017年硕士论文　论文类型：学位论文

【摘要】：移动通信技术的迅速发展对带宽和信息传输速率提出了更高的要求。更高的带宽需要更高的载波频率,因此Ku波段可以作为下一代移动通信载波频率的良好选择之一。载波频段的升高、带宽的增加,给高性能射频系统的设计带来了不小的挑战。基于上述背景,本课题研制了用于宽带通信的高性能Ku波段超宽带射频接收机。本文的主要工作是:1.确定了 Ku波段超宽带射频接收机总体方案。分析比较了几种常见射频接收机结构,结合课题要求,选用了超外差结构。根据射频频率14GHz、系统带宽1GHz等要求,结合现有滤波器的性能指标,确定了变频方案和1.6GHz的中频频率,实现了宽频带与结构复杂性、性能与成本的平衡。对射频接收机进行了指标分析评估和链路仿真,确定了具体电路方案以及实现方式。2.在系统方案下完成了射频接收机的关键模块性能指标的评估测试和电路设计。制作了射频滤波器、下变频和解调等模块的测试版,调试、评估和比较了多款器件的实际性能,优化了接收机射频系统的电路方案,完成了原理图设计。3.完成了 Ku波段射频接收机的实物制作和测试,设计了射频接收机的版图和屏蔽结构。接收机最终实测增益79dB、1GHz带宽内的增益平坦度为3.8dB、噪声系数小于4.2dB、800MHz带内QPSK调制下的EVM小于31.9%,技术指标达到了系统要求。本文研制的射频接收机具有良好的射频性能,已投入实际应用中。
[Abstract]:The rapid development of mobile communication technology puts forward higher requirements for bandwidth and information transmission rate. Higher bandwidth requires higher carrier frequency. Therefore, Ku-band can be used as a good choice for the next generation mobile communication carrier frequency. The rise of carrier band and the increase of bandwidth bring a great challenge to the design of high performance RF system. A high performance Ku-band ultra-wideband radio frequency receiver for broadband communication is developed in this paper. The main work of this paper is to determine the overall scheme of Ku-band ultra-wideband radio frequency receiver. According to the requirements of the RF frequency 14GHz and the system bandwidth 1GHz, combined with the performance index of the existing filter, the frequency conversion scheme and the 1.6GHz intermediate frequency are determined. The broadband and structural complexity are realized. Performance and cost balance. Index analysis, evaluation and link simulation of RF receiver are carried out. Under the system scheme, the evaluation, test and circuit design of the key modules of RF receiver are completed. The test version of RF filter, downconversion and demodulation module is made and debugged. The practical performance of many kinds of devices is evaluated and compared, the circuit scheme of receiver RF system is optimized, and the schematic design .3.The physical fabrication and test of Ku-band RF receiver are completed. The layout and shielding structure of the RF receiver are designed. The gain flatness of the receiver is 3.8 dB in the measured gain of 79dBU 1GHz bandwidth, and the EVM of the receiver with the noise coefficient less than 4.2 dB ~ 800MHz is less than 31.9b under the modulation of the QPSK modulation in the band. The technical specifications meet the requirements of the system. The RF receiver developed has good RF performance. It has been put into practical application.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5;TN851

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