基于FPGA的多速率信号发送器的设计

Design of Multi Rate Signal Transmitter Based on FPGA

针对传统多速率信号发送器信号的非线性失真大、可调性差等问题,文中提出了一种基于FPGA与DAC5682的新型的设计方案;方案中着重介绍了DAC5682数模转换模块的实现方式以及多速率信号处理算法的实现;DAC模块可以同时实现4通道的数模转换,采样率可以达到1Gsps;同时,为了验证FPGA算法设计的可靠性,文中首先通过MATLAB平台对算法进行了仿真建模分析;然后通过硬件描述语言将算法移植到FPGA电路上,在modelsim中实现了综合后仿真;最后给出了仿真波形;通过仿真验证,发送器具有良好的滤波效果,并可根据实际需求灵活的对基带频率以及变换后的混频模块进行相应的变换和升级;通过FPGA+DAC的设计,简化了系统结构,还能较为高效的实现系统中的各项技术指标;该系统可以广泛应用与移动通信系统中。

Aiming at the problem that the traditional multi rate signal is nonlinear distortion, and the adjustable difference, a new design scheme based on FPGA and DAC5682 is proposed. Program focuses on the implementation DAC5682 digital-analog converter module and multi-rate signal processing algorithms. DAC module can achieve 4-channel digital-analog conversion, the sampling rate can reach 1Gsps. Meanwhile, in order to verify the reliability of FPGA algorithm design, paper first platform through MATLAB algorithm for the simulation modeling and analysis; Then the algorithm is transplanted to the FPGA circuit through the hardware description language, and the simulation is realized in Modelsim; Finally, the simulation waveforms are given. Through simulation, the transmitter has a good filtering effect, and the flexibility of the baseband frequency and transformed mixing modules to transform and upgrade based on actual demand. Through the design of FPGAd-DAC, the structure of the system is simplified, it can also be more efficlent implementation of the technical indicators in the sys- tem. The system can be widely used in mobile communication systems.