基于PCI接口的数字中频接收机优化设计

【作者】 李茂；

【导师】 张怀武；

【作者基本信息】 电子科技大学 ， 电子信息材料与元器件， 2007， 硕士

【摘要】 随着软件无线电技术的迅速发展,无论是通信系统还是雷达系统,都希望能够构建基于软件无线电技术的中频接收机系统,从而可通过软件来定义硬件平台的功能,大大提高系统的灵活性。基于软件无线电技术的中频数字接收机的研究正逐渐成为现代雷达系统设计的重要组成部分。本课题结合项目要求,设计实现了一种基于PCI总线结构的数字中频接收机。本文研究了几种数字化正交接收机数学模型,分析了各自特点,并根据课题要求选择了多相滤波结构作为理论依据,进而对其进行优化设计,推导出了一种在某种条件下的最优化设计数学模型。优化方案采用先抽取,后低通滤波,再混频的结构,对滤波器组进行复用,有效降低了系统的资源消耗,提高了系统性能。在算法模型确定之后,接下来就需要选择合适的硬件平台,实现所需要的数字化接收机。本课题采用自上而下的设计方法,进行系统的设计与规划,确定了系统的工作时钟与工作方式,以及各个模块的功能、时序和接口方式。使用Verilog语言,在ISE+ModelSim的平台上,参照完整的FPGA/CPLD程序设计流程,进行各个模块的设计与仿真。然后利用ISE将各个模块连接起来,完成整个系统的FPGA程序设计、实现、仿真及时序分析,并最终将其转换为可下载的文件形式。为了满足信号处理、数据传输的要求,同时增强其通用性,接下来利用PCI总线实现数据传输接口,开发了设备驱动程序和控制界面软件,实现了数据传输和控制。最后根据测试结果对接收机的性能进行了分析。本课题采用Xilinx公司的ISE结合Mentor公司的ModelSim进行程序的设计与仿真,数字接收机部分选择Xilinx公司Spartan-3系列的XC3S400作为目标芯片,PCI总线接口部分选择了PLX公司的PCI9054专用芯片,最终实现了课题的要求。更多还原

【Abstract】 With the fast development of Software Radio technology, the digital receiver systems are coming to play a major role whether in the communication systems or in the radar systems. It is expected to be designed based on the Software Radio technology in order to define the function of the hardware by the software, which can greatly improve the facility and the reliability of the systems. This subject has completed the research and development of a digital IF receiver based on PCI bus, associating with the project requirements.This subject has analyzed several models of the digital receiver, and compared their characteristics. It chose the poly-phase filter structure as the theoretical basis, and put forward an optimum design of mathematic model. It adopted the structure of decimate-filter-mix, and duplicated the filter bank, so reduced system resource efficiently, and improved the performance.The next step was to select the suitable hardware platform, and to realize the needed digital receiver. This subject has adopted the Top-down design flow to perform system designing and budgeting, setting the system clock and its running mode. The function, timing and interface mode of each module were also set. Verilog HDL was used to design and simulate each module in ISE and ModelSim, referring to the standard FPGA/CPLD design flow. ISE was used to connect each module, and complete the FPGA program design, implementation, simulation and timing analyze of the whole system. Finally design file was converted to a downloadable format.In order to meet the signal processing、data transfer requirement, and also make the system general, PCI bus interface have been designed, the device driver program and user application program have been developed. Finally the system test has been performed , the system performance through the results have been analyzed.This subject used ISE from Xilinx and ModelSim from Mentor Graphics to perform the design and simulation of FPGA programs; selected the Spartan-3 series FPGA (XC3S400) from Xilinx as the target device in the digital receiver, and selected the PCI9054 from PLX to implement PCI bus. It achieved the design objectives finally.更多还原