说明：  简单的扩频程序，可以理解码分多址的基本原理，程序采用pn码实现扩频，是简单的扩频程序
(简单的扩频程序，可以理解码分多址的基本原理，程序采用pn码实现扩频，是简单的扩频程序 In brief expand repeatedly procedure, can comprehend that the code divides the basic principle of many addresses, the procedure adopts a pn code realization to expand repeatedly, is in brief expand repeatedly procedure)