1、1235选择重发ARQ系统9接收数据有错码组有错码组214365759810 11131412发送数据9958521436710 1113 1412重发码组重发码组NAK9ACK1NAK5ACK5ACK967k个信息位r个监督位an-1an-2.arar-1an-2.a0t码长 n=k+r分组码的结构8(0,0,0)(0,0,1)(1,0,1)(1,0,0)(1,1,0)(0,1,0)(0,1,1)(1,1,1)a2a0a1910 ed0123BA汉明距离ed0码距等于3的两个码组120 tdBtA汉明距离012345td0码距等于5的两个码组10AB1tt汉明距离e码距等于(e+t+1)的两
2、个码组)(10teted1110-610-510-410-310-210-1编码后Eb/n0(dB)编码和误码率关系PeCDEAB2PSK1210-610-510-410-310-210-1编码后Eb/n0(dB)编码和误码率关系PeCDEAB2PSK13BsssbRnPTnPnTPnE0000)/1(10-610-510-410-310-210-1编码后Eb/n0(dB)编码和误码率关系PeCDEAB2PSK14)(/00dBnEnEGcbubdB150021aaann1021aaann16jnjnjppCnjP)1(),()!(!jnjnCnj2/1222)1(njjnjnjuppCP2/
3、)1(1222)1(njjnjnjuppCP172/1222)1(njjnjnjuppCP82443242204442242212424210666126)1(6)1()1()1(ppppppppppCppCppCPjjjju1811na12na11a10a21na22na21a20amna1mna2ma1ma01nc2nc1c0cnmnmnk)1()1(190021aaann021aaaSnn021aaaSnn20021aaaSnn1212rknrr或211212rknrr或24561aaaaS13562aaaaS03463aaaaS22000034613562456aaaaaaaaaaaa
4、346035614562aaaaaaaaaaaa2324561aaaaS13562aaaaS03463aaaaS2410 ed120 td1212rrrnk25000034613562456aaaaaaaaaaaa010011010010101100010111012345601234560123456aaaaaaaaaaaaaaaaaaaaa26010011010010101100010111012345601234560123456aaaaaaaaaaaaaaaaaaaaa0001011001110101011101000123456aaaaaaa271011001110101011101
5、00HrPIH001101101011011001110A=a6 a5 a4 a3 a2 a1 a0 0=000283456012101111011110aaaaaaa346035614562aaaaaaaaaaaaQ34563456012011101110111aaaaaaaaaaa290110001101001011001001111000QGkI IG34560123456aaaaaaaaaaaA300121aaaaAnn0121bbbbBnnB A=E(模2)0121eeeeEnniiiiiababe当当,1,031323334012211)(axaxaxaxTnnnn11010011
6、)(25623456xxxxxxxxxxT35npnpQnm,36)()()()(xRxQxNxF）（模)()()(xNxRxF）（模)1(133xx）（模)1(113224xxxxx37）（模)1()()(nixxTxTx012211)(axaxaxaxTnnnn)()(1102211011112211xTaxaxaxaxaxaxaxaxaxaxTxininininniniinininninni1)(256xxxxT）（模)1()(723535893xxxxxxxxxxTx38G34560123456aaaaaaaaaaaA0110001101001011001001111000QGkI I
7、3940)()()()()(21xgxxgxgxxgxxkkG41)()()()(2xgxxgxgxxG001011101011101011100)(xG)()()()()()()()()()(452645262456456xgaxaxaxgaxxgaxgxaxgxxgxgxaaaxaaaxTG42）（模)1()()(nixxTxTx1)()(1)(nnkxxTxQxxTx)()1()(xTxxTxnk43)()1()(xTxxTxnk)()(1xhxxgxkn)1)(1)(1(13237xxxxxx1)1)(1(2423xxxxxx1)1)(1(2343xxxxxx44)()()()()(x
8、gxrxQxgxmxkn11)1(1)()(24222456xxxxxxxxxxxxgxmxkn1011110111110111110000045)(/)()()(/)(xgxrxQxgxR)(/)()()(/)(xgxrxQxgxR464748492PSK汉明码(7,4)t=1 汉明码(31,26)t=1扩展戈莱码(24,12)t=3BCH码(127,64)t=10Eb/n0 (dB)Pe505152编码输出每次输入k比特1k1k1k1k 1 k2k3kNk 12nNk级移存器n个模2加法器每输入k比特旋转1周53123b3b1输入b2编码输出c2c1c3321331211bbbcbbcbc
9、54000111001110011100010101000111001110011100010101c1c2c3000100111011001101110010c1c2c3111000001110c1c2c3信息位 1 1 0 1ba起点信息位000111c1c2c3abcdabcdabcdabcd上半部下半部10a状态 b3b2 a 0 0 b 0 1 c 1 0 d 1 1abcdabcdcdab01100155321331211bbbcbbcbc123b3b1输入b2编码输出c2c1c3abcd00011110111001001110000156110110110110011011011
10、010010010101101101001001001001abcdabcd000000000000000111111111111111100100100abcd000111101110010011100001abcdabcd1100100011111005758110110110110011011011010010010101101101001001001001abcdabcd0000000000000001111111111111111001001005960序号路径原幸存路径的距离新增路径段新增距离总距离幸存否？1abca+a3aa25否2abdc+a1ca23是3abca+b3ab14
11、否4abdc+b1cb12是5abcb+c4bc37否6abdd+c4dc15是7abcb+d4bd04是8abdd+d4dd26否61abcd011010010101001abcd11110010011011062110011010010101101001001abcdabcd000 111100100000 01101100110163110011010010101101001001abcdabcd000 111100100000 011011001110011010010101101001001abcdabcd000 111100100000 0110110011016465内编码器(n
12、,k)调制器信道解制器内解码器(n,k)外解码器(N,K)外编码器(N,K)输入输出66RSCC交织器RSCCbibic1ic2iDDbibici67a11a12a1ma21a22a2man1an2anm68xxx1234xxx1234x x x 1 xxx1xxx x x x(a)第14比特输入时的状态xx2567834x5678x x 2 5 x2x51xx x x x(b)第58比特输入时的状态x369362951x x x x 9101112101112784x 3 6 9(c)第912比特输入时的状态101376954 3 2 1 14151611128131415164710134 7 10 13(d)第1316比特输入时的状态交织器解交织器69信噪比(dB)20解码后的误码率交织器容量 10010-110-210-310-410-510-610-770
