This paper analyzes a typical implementation structure of implementing broadband compressive sampling, i. e., modulated wideband converter.Based on the principle of modulated wideband converter,it puts forward the design method of deterministic measurement matrix by using high-speed pseudo sequence as wideband mixed modulated waveform of modulated wideband converter. The four-channel high-speed pseudo random sequence is designed and implemented based on FPGA. The sampling and reconstruction for wideband sparse signals are performed combining with analog mixer, lowpass filter, low-speed A/D converter, digital processing platform and signal reconstruction. The main advantages of FPGA implementation are of easily generating pseudo random sequence, simply implementing structure and flexibly setting parameters.The software simulation and the hardware testing results prove the correct-ness and feasibility of the proposed method.%分析了实现宽带压缩采样的一种典型结构——调制宽带转换器, 根据调制宽带转换器的原理, 设计了将高速伪随机序列用作调制宽带转换器的宽带混频调制波形的框图, 并通过FPGA的设计实现了四通道高速伪随机序列. 结合模拟混频器、 低通滤波器、 低速模数转换器、 数字处理平台以及信号重构算法实现对宽带稀疏信号进行采样和重构操作. 这种产生高速伪随机序列的方法, 可以根据需要, 选择合适的混频调制波形.
展开▼
