通信原理--第十章

1、123 停止等待停止等待ARQ系統(tǒng)系統(tǒng)接收數(shù)據(jù)接收數(shù)據(jù)ACKACKNAKACKACKNAKACK1233455t發(fā)送數(shù)據(jù)發(fā)送數(shù)據(jù)12334556t有錯(cuò)碼組有錯(cuò)碼組有錯(cuò)碼組有錯(cuò)碼組拉后拉后ARQ系統(tǒng)系統(tǒng)214365798接收數(shù)據(jù)接收數(shù)據(jù)有錯(cuò)碼組有錯(cuò)碼組有錯(cuò)碼組有錯(cuò)碼組910 1110 11 12576ACK1NAK5NAK9ACK55769521436798發(fā)送數(shù)據(jù)發(fā)送數(shù)據(jù)10 1110 11 12重發(fā)碼組重發(fā)碼組重發(fā)碼組重發(fā)碼組4選擇重發(fā)選擇重發(fā)ARQ系統(tǒng)系統(tǒng)9接收數(shù)據(jù)接收數(shù)據(jù)有錯(cuò)碼組有錯(cuò)碼組有錯(cuò)碼組有錯(cuò)碼組214365759810 11131412發(fā)送數(shù)據(jù)發(fā)送數(shù)據(jù)9958521436710

2、1113 1412重發(fā)碼組重發(fā)碼組重發(fā)碼組重發(fā)碼組NAK9ACK1NAK5ACK5ACK956(0,0,0)(0,0,1)(1,0,1)(1,0,0)(1,1,0)(0,1,0)(0,1,1)(1,1,1)a2a0a1710 ed0123BA漢明距離漢明距離ed0碼距等于碼距等于3的兩個(gè)碼組的兩個(gè)碼組120 tdBtA漢明距離漢明距離012345td0碼距等于碼距等于5的兩個(gè)碼組的兩個(gè)碼組8AB1tt漢明距離漢明距離e碼距等于碼距等于(e+t+1)的兩個(gè)碼組的兩個(gè)碼組)(10teted9信息位信息位監(jiān)督位監(jiān)督位晴晴000云云011陰陰101雨雨110k個(gè)信息位個(gè)信息位r個(gè)監(jiān)督位個(gè)監(jiān)督位an-1

3、an-2.arar-1an-2.a0t碼長(zhǎng)碼長(zhǎng) n = k + r1010-610-510-410-310-210-1編碼后編碼后Eb/n0 (dB)編碼和誤碼率關(guān)系編碼和誤碼率關(guān)系Pe CDE A B2PSK1110-610-510-410-310-210-1編碼后編碼后Eb/n0 (dB)編碼和誤碼率關(guān)系編碼和誤碼率關(guān)系Pe CDE A B2PSK12BsssbRnPTnPnTPnE0000)/1 (10-610-510-410-310-210-1編碼后編碼后Eb/n0 (dB)編碼和誤碼率關(guān)系編碼和誤碼率關(guān)系Pe CDE A B2PSK13)(/00dBnEnEGcbubdB140021

4、aaann1021aaann1511na12na11a10a21na22na21a20amna1mna2ma1ma01nc2nc1c0cnmnmnk)1()1(160021aaann021aaaSnn021aaaSnn171212rknrr或18S1 S2 S3錯(cuò)碼位置錯(cuò)碼位置S1 S2 S3錯(cuò)碼位置錯(cuò)碼位置001a0101a4010a1110a5100a2111a6011a3000無(wú)錯(cuò)碼無(wú)錯(cuò)碼1212rknrr或24561aaaaS13562aaaaS03463aaaaS19000034613562456aaaaaaaaaaaa346035614562aaaaaaaaaaaa信息信息位位a6

5、 a5 a4 a3監(jiān)督監(jiān)督位位a2 a1 a0信息信息位位a6 a5 a4 a3監(jiān)督監(jiān)督位位a2 a1 a000000001000111000101110011000010101101001000111101011001010011011000010101101110101001100111110100011100011111112024561aaaaS13562aaaaS03463aaaaSS1 S2 S3錯(cuò)碼位置錯(cuò)碼位置S1 S2 S3錯(cuò)碼位置錯(cuò)碼位置001a0101a4010a1110a5100a2111a6011a3000無(wú)錯(cuò)碼無(wú)錯(cuò)碼2110 ed120 td1212rrrnk2200

6、0034613562456aaaaaaaaaaaa010011010010101100010111012345601234560123456aaaaaaaaaaaaaaaaaaaaa23010011010010101100010111012345601234560123456aaaaaaaaaaaaaaaaaaaaa0001011001110101011101000123456aaaaaaa24101100111010101110100HrPIH001101101011011001110A = a6 a5 a4 a3 a2 a1 a0 0 = 000253456012101111011110a

7、aaaaaa346035614562aaaaaaaaaaaaQ34563456012011101110111aaaaaaaaaaa260110001101001011001001111000QGkI IG34560123456aaaaaaaaaaaA270121aaaaAnn0121bbbbBnnB A = E (模2)0121eeeeEnniiiiiababe當(dāng)當(dāng), 1, 0282930碼組編碼組編號(hào)號(hào)信息位信息位監(jiān)督位監(jiān)督位碼組編碼組編號(hào)號(hào)信息位信息位監(jiān)督位監(jiān)督位A6a5a4a3a2a1a0a6a5a4A3a2a1a0100000005100101120010111610111003010

8、111071100101401110018111001031012211)(axaxaxaxTnnnn11010011)(25623456xxxxxxxxxxT32npnpQnm,33)()()()(xRxQxNxF）（模)()()(xNxRxF）（模) 1(133xx）（模) 1(113224xxxxx34）（模) 1()()(nixxTxTx012211)(axaxaxaxTnnnn)()(1102211011112211xTaxaxaxaxaxaxaxaxaxaxTxininininniniinininninni1)(256xxxxT）（模) 1()(723535893xxxxxxxxx

9、xTx35G34560123456aaaaaaaaaaaA0110001101001011001001111000QGkI I3637)()()()()(21xgxxgxgxxgxxkkG碼組編號(hào)碼組編號(hào)信息位信息位監(jiān)督位監(jiān)督位碼組編號(hào)碼組編號(hào)信息位信息位監(jiān)督位監(jiān)督位A6a5a4a3a2a1a0a6a5a4A3a2a1a0100000005100101120010111610111003010111071100101401110018111001038)()()()(2xgxxgxgxxG001011101011101011100)(xG)()()()()()()()()()(45264526

10、2456456xgaxaxaxgaxxgaxgxaxgxxgxgxaaaxaaaxTG39）（模) 1()()(nixxTxTx1)()(1)(nnkxxTxQxxTx)() 1()(xTxxTxnk40)() 1()(xTxxTxnk)()(1xhxxgxkn) 1)(1)(1(13237xxxxxx1) 1)(1(2423xxxxxx1) 1)(1(2343xxxxxx41)()()()()(xgxrxQxgxmxkn11) 1(1)()(24222456xxxxxxxxxxxxgxmxkn1011110111110111110000042)(/)()()(/)(xgxrxQxgxR)(/

11、 )()()(/ )(xgxrxQxgxR4344nktg(x)nktg(x)1721233341912122221223247271663534351456647133476565732453404652444307335710761354300067171777353745462PSK漢明碼漢明碼(7, 4) t=1 漢明碼漢明碼(31, 26) t=1擴(kuò)展戈萊碼擴(kuò)展戈萊碼(24, 12) t=3BCH碼碼(127, 64) t=10Eb / n0 (dB)Pe474849編碼輸出編碼輸出每次輸入每次輸入k比特比特1k1k1k1k 1 k2k3kNk 12nNk級(jí)級(jí)移存器移存器n個(gè)模個(gè)模2

12、加法器加法器每輸入每輸入k比特比特旋轉(zhuǎn)旋轉(zhuǎn)1周周50123b3b1輸入輸入b2編碼輸出編碼輸出c2c1c3321331211bbbcbbcbcb11101000b3b200011110011000c1c2 c3111110010100001011000狀態(tài)狀態(tài)abdcbca51000111001110011100010101000111001110011100010101c1c2c3000100111011001101110010c1c2c3111000001110c1c2c3信息位信息位 1 1 0 1ba起點(diǎn)起點(diǎn)信息位信息位000111c1c2c3abcdabcdabcdabcd上上半半部

13、部下下半半部部10a狀態(tài)狀態(tài) b3b2 a 0 0 b 0 1 c 1 0 d 1 1abcdabcdcdab01100152前一狀態(tài)前一狀態(tài)b3 b2當(dāng)前輸入當(dāng)前輸入 b1輸出輸出c1c2c3下一狀態(tài)下一狀態(tài)b3 b2a (00)01000111a (00)b (01)b (01)01001110c (10)d (11)c (10)01011100a (00)b (01)d (11)01010101c (10)d (11)321331211bbbcbbcbc123b3b1輸入輸入b2編碼輸出編碼輸出c2c1c3abcd0001111011100100111000015311011011011

14、0011011011010010010101101101001001001001abcdabcd000000000000000111111111111111100100100abcd000111101110010011100001abcdabcd1100100011111005455110110110110011011011010010010101101101001001001001abcdabcd00000000000000011111111111111110010010056序序號(hào)號(hào)路徑路徑對(duì)應(yīng)序列對(duì)應(yīng)序列漢明距離漢明距離幸存否？幸存否？1aaaa000 000 0005否否2abca11

15、1 001 0113是是3aaab000 000 1116否否4abcb111 001 1004是是5aabc000 111 0017否否6abdc111 110 0101是是7aabd000 111 1106否否8abdd111 110 1014是是57序號(hào)序號(hào)路徑路徑原幸存路徑的原幸存路徑的距離距離新增新增路徑段路徑段新增距離新增距離總距離總距離幸存否？幸存否？1abca+a3aa25否否2abdc+a1ca23是是3abca+b3ab14否否4abdc+b1cb12是是5abcb+c4bc37否否6abdd+c4dc15是是7abcb+d4bd04是是8abdd+d4dd26否否58ab

16、cd011010010101001abcd11110010011011059110011010010101101001001abcdabcd000 111100100000 01101100110160110011010010101101001001abcdabcd000 111100100000 011011001110011010010101101001001abcdabcd000 111100100000 0110110011016162內(nèi)編內(nèi)編碼器碼器(n, k)調(diào)調(diào)制制器器信信道道解解制制器器內(nèi)解內(nèi)解碼器碼器(n, k)外解外解碼器碼器(N, K)外編外編碼器碼器(N, K)輸輸入入輸輸出出63RSCC交織器交織器RSCCbibic1ic2iDDbibici64a11a12a1ma21a22a2man1an2anm65xxx1234xxx1234x x x 1 xxx1xxx x x x (a) 第第14比特輸入時(shí)的狀態(tài)比特輸入時(shí)的狀態(tài)xx2567834x5678x x 2 5 x2x51xx x x x