中文说明：
对（7，4）循环码的误码率进行了matlab的仿真，通过对比两条曲线，直观对比出未经过信道编码和经过信道编码的误码率比较。
English Description：
The bit error rate of (7,4) cyclic code is simulated by MATLAB. By comparing the two curves, the comparison of bit error rate without channel coding and that after channel coding is intuitively compared