中文说明：一个简单的直接扩展范围模型，建立了在MATLAB的M文件。在从10误差的出现（100）dB，从而论证了谱直接膨胀系统的可能性。模型构建图。
English Description：
A simple model of direct expansion range, built in Matlab M-file. The appearance of errors in it starts from -10 (-100) dB, thereby demonstrates the possibility of direct expansion systems of the spectrum. model builds charts. In telecommunications, direct-sequence spread spectrum (DSSS) is a spread spectrum Click the file on the left to start the preview,please ！The preview only provides 20% of the code snippets, the complete code needs to be downloaded Loading Report