结合PCA的尺度不变特征变换(SIFT)算法，LDPC码的完整的编译码，对于初学者具有参考意义，基于互功率谱的时延估计，MIMO OFDM matlab仿真,与理论分析结果相比。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Complete codec LDPC code, For beginners with a reference value, Based on the time delay estimation of power spectrum, MIMO OFDM matlab simulation, Compared with the results of theoretical analysis.