基于FPGA+COM Express的基带数字信号处理平台设计

针对卫星信号分离系统运算量大,实时性要求高的特点,设计了一种基于FPGA+COM Express的基带数字处理平台。通过对系统需求的分析,构建系统的硬件架构,将系统分为运算模块、网络接口模块、 A/D电路、D/A电路、电源变换电路和时钟管理电路等部分,然后根据各部分的具体需求确定主要芯片的选择和电路的具体设计。根据系统特点,将系统运算分为两类,将数据运算量大,实时性要求高但结构简单的部分用FPGA实现,将数据量少但控制结构复杂、实时性要求低的部分用COM Express实现。经测试,该平台能够满足卫星信号分离系统的运算需求和实时性要求。该方案可作为通用数字基带处理平台,能够灵活实现常用的基带数字信号处理系统所需的信号采集、运算、控制和输出,具有设计灵活多样,开发简单易行,研发周期短等优点。

The Design of FPGA+COM Express-based on Baseband Signal Processing Platform

In view of the large computational complexity and high real-time requirement of the satellite signal split system, a baseband signal processing platform was designed based on FPGA+COM Express architecture. Through the analysis of system requirements, build the hardware architecture of the system, divides the system into operation module, network interface module, A/D circuit, D/A circuit, power conversion circuit and clock management circuit part, and then determine the main chip according to the specific needs of each part of the circuit selection and specific design. According to the characteristics of the system, the system operation will be divided into two categories, the data of computation and high real-time requirements but simple structure parts using FPGA, the amount of data but less control of complex structure, low real-time requirements by COM Express. Tests were performed on the platform, and results showed that, the platform met operation and real-time requirements for the satellite signal split system. This design scheme can realize all of the signal process flexibility such as signal quantization and operation and control and output for the baseband signal processing platform. This design scheme can be used as a general baseband signal processing platform, which has a short period to design and has advantages on flexibility and easy to design.