具体仿真步骤参考:http://www.cnblogs.com/woshitianma/archive/2013/01/17/2865220.html 和 http://wenku.baidu.com/link?url=w4GXxAqgqQBAh-n_ZXR2EWFcQyqWSw6oQWBBvVzRffv0q2Cg5uxTOCWadHzd-m8QwKadrVYTUzaePk6kHFG3xNAq2TioMa74t8uBVeLYPP_