计网实验LAB1-Coding-on-error-dectecting-algorithms(C++).doc

计算机通信与网络实验 课程实验报告实验一 : LAB1 Coding on error dectecting algorithms(C+)实验名称：LAB1 Coding on error dectectingalgorithms(C)1.实验内容1. Cyclic redundancy checkUsing the polynomials below to encode random generated data stream (40-100bits). Show the FEC, and encoded data frame. CRC-4 x4+x+1 ITU G.704CRC-16 x16+x15+x2+1 IBM SDLCCRC-32 x32+x26+x23+.+x2+x+1ZIP, RAR, IEEE 802 LAN/FDDI, IEEE 1394, PPP-FCSFor the error patter listed below, what the conclusion does the receiver get? Can the receiver findthe errors?Case Error patternNo error 00000000One error 1000.000Two errors 100.001Random errors Random error pattern2.Parity checkUsing even or odd parity check on random generated data stream (8-20bits).Show encoded data frame.For the error patter listed below, what the conclusion does the receiver get? Can the receiver find the errors?CaseError patternNo error00000000One error1000.000Two errors100.0012.实验结果一、二、3.实验程序一、#include #include #include stdlib.hunsigned int char2int(char *str) unsigned int count=0, ret=0; for(count = 0; countstrlen(str);count+) ret = ret1; if(0 != strcount) ret+=1; return ret;unsigned int getR(char *str) unsigned int c =0 ; int ret = strlen(str)-1; for(c=0;c 1; return c;void CRC(char *scode, char *p, char*g )unsigned int iP = char2int(p);unsigned int iG = char2int(g);unsigned int r= getR(g);unsigned int code = iP = getRi(iG);) yx = yx (iG(getRi(yx) - getRi(iG);code += yx;itoa(code,scode,2);void main()char data8= , bds8=,code16=;printf(数据：);scanf(%s, data);printf(表达式：);scanf(%s, bds);CRC(code,data,bds);printf(编码：%s,code);二、#include #include void fun(char *s) int i=0; int sum=0; for(i=0;i200;i+) sum=sum+si; if(sum+1)%2=0) printf(+1通过偶校验); if(sum+0)%2!=0) printf(+0通过奇校验); if(sum+1)%2=1) printf(+1通过奇校验); if(sum+0)%2=0) printf(+0通过偶校验); int main() printf(输入二进制码：n); char