是学习PCA特征提取的很好的学习资料，搭建OFDM通信系统的框架，实现用SDRAM运行nios，同时用SRAM保存摄像头数据。- Is a good learning materials to learn PCA feature extraction, Build a fr a mework OFDM communication system, Implemented with SDRAM run nios, while saving camera data SRAM.