实现用SDRAM运行nios，同时用SRAM保存摄像头数据，这个有中文注释，看得明白，单径或多径瑞利衰落信道仿真。- Implemented with SDRAM run nios, while saving camera data SRAM, The Chinese have a comment, understand it, Single path or multipath Rayleigh fading channel simulation.