一种宽带零中频接收前端设计与性能测试

发布时间：2018-07-13 21:04

【摘要】：本文主要利用软件无线电技术设计一种可重配置宽带零中频接收前端，通过SPI配置寄存器的方式改变接收前端的工作模式，根据具体需求设置工作频点、采样率、带宽和通道增益等参数，最后对该接收前端进行性能测试。首先，分析了接收机基本架构和工作原理，重点讨论了超外差接收机和零中频接收机两种架构的组成、性能和优缺点。接着，详细介绍了零中频接收前端的设计流程。首先介绍宽带零中频接收前端总体结构，然后设计SPI接口程序并完成对单个寄存器的读写，再根据具体需求分模块对接收前端进行配置并设计整个配置程序，最后对接收信号进行IQ解析和功率谱分析证明设计满足要求。最后，对零中频接收前端进行性能测试。需要测试的性能指标分为两类：常规指标和非线性指标，其中非线性指标包括输入三阶交调截点IIP3、无杂散动态范围SFDR、误差矢量幅度EVM和互补累计分布函数CCDF。每个性能指标测试时首先分析指标的含义，然后给出相应测试方法，，最后对得到的结果进行分析。所有指标测试完成后将测试结果与标称值进行对比得出结论。
[Abstract]:This paper mainly uses the software radio technology to design a reconfigurable wideband zero-if receiving front end, changes the working mode of the receiving front end by SPI configuration register, sets the working frequency and sampling rate according to the specific requirements. The bandwidth and channel gain are used to test the performance of the receiver. Firstly, the basic architecture and working principle of the receiver are analyzed, and the composition, performance, advantages and disadvantages of the superheterodyne receiver and the zero if receiver are discussed. Then, the design flow of zero if receiver front end is introduced in detail. This paper first introduces the overall structure of the wideband zero-if receiving front end, then designs the SPI interface program and completes the reading and writing of a single register, then configures the receiving front end by modules according to the specific requirements and designs the whole configuration program. Finally, IQ analysis and power spectrum analysis of the received signal show that the design meets the requirements. Finally, the performance of zero if receiver front end is tested. The performance indexes to be tested can be divided into two categories: conventional indexes and nonlinear indexes, including input third-order intersecting cut-off point IIP3, non-spurious dynamic range SFDR, error vector amplitude EVM and complementary cumulative distribution function (CCDF). In each performance index test, the meaning of the index is analyzed first, then the corresponding test method is given. Finally, the results obtained are analyzed. The test results are compared with the nominal values after the completion of all indicators.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN851

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