[發明專利]LDPC碼字的交織和映射方法及解交織解映射方法

有效

• 申請號: 201410438396.8
• 申請日: 2014-08-29
• 公開（公告）號: CN105376014A
• 公開（公告）日: 2016-03-02
• 發明（設計）人: 張文軍;徐洪亮;何大治;郭序峰;趙杰;楊帆;堯勇仕;史毅俊;徐胤
• 申請（專利權）人: 上海數字電視國家工程研究中心有限公司
• 主分類號: H04L1/00
• 分類號: H04L1/00;H04L27/34
• 代理公司: 暫無信息
• 代理人: 暫無信息

1.一種LDPC碼字的交織映射方法，其特征在于，包括如下步驟：

將所述LDPC碼字中的校驗部分進行第一次比特交織以得到校驗比特流；

將所述LDPC碼字中的信息比特部分與所述校驗比特流拼接成第一次比特交織后的LDPC碼字；

將所述第一次比特交織后的LDPC碼字按預定長度分成連續的多個比特子塊，并按照相應的比特交換圖案變換所述比特子塊的排列順序以形成第二次比特交織后的LDPC碼字；

將所述第二次比特交織后的LDPC碼字按列順序寫入存儲空間并按行順序從該存儲空間內讀出，得到第三次比特交織后的LDPC碼字；

對所述第三次比特交織后的LDPC碼字依照相應的星座圖進行星座映射以得到符號流；其中，所述比特交換圖案和所述星座圖都與不同碼率的LDPC碼表相對應。

2.如權利要求1所述的LDPC碼字的交織映射方法，其特征在于，將所述LDPC碼字中的校驗部分進行第一次比特交織以得到校驗比特流包括：

將所述LDPC碼字中的校驗部分按列順序寫入存儲空間并按行順序從該存儲空間內讀出以得到校驗比特流。

3.如權利要求1所述的LDPC碼字的交織映射方法，其特征在于，所述預定長度為320比特。

4.如權利要求1所述的LDPC碼字的交織映射方法，其特征在于，

所述LDPC碼表中LDPC碼字的碼長為57600比特、碼率為5/6；

碼表為：

相應的比特交換圖案為：

1401417128816710114316001125573619924231334912228501181133034126197863181469339145128487511301328672139124177581371629180444094571351112389459510411115417129261342710423368315617255698741531615065851166614417114471216616362157974815276155136202521541164701053157710822961739214813153102109815910617414732767946138793517959100175149107151178821106816517090168125129115411581201311937816917638127121601037552161117141421693684643143

相應的星座圖為：

星座點復數符號00.046016-0.19928i10.04169-0.31873i20.0572-0.5009i30.1248-0.4458i40.16186-0.20686i50.1953-0.26857i60.3301-0.3896i70.244-0.4019i80.0794-0.8118i90.2342-0.7783i100.0689-0.6496i110.1934-0.6217i120.5135-0.6336i130.3795-0.7192i140.4174-0.513i150.3054-0.5754i160.062247-0.063157i170.37711-0.060045i

180.5724-0.0565i190.4995-0.1254i200.1901-0.072644i210.30737-0.13397i220.4187-0.3189i230.4342-0.2296i240.8377-0.087i250.8035-0.2531i260.6985-0.078i270.657-0.2093i280.6336-0.5265i290.734-0.4i300.5232-0.4192i310.6021-0.3168i320.171-1.5654i330.4862-1.4888i340.1173-1.3402i350.3546-1.294i361.0161-1.1857i370.7659-1.3596i380.8079-1.065i

390.5887-1.2003i400.0947-0.9738i410.2795-0.9338i420.1114-1.146i430.3287-1.0979i440.6125-0.7588i450.4536-0.8607i460.7204-0.8902i470.5336-1.0118i481.5611-0.1362i491.5001-0.4134i501.3345-0.1491i511.2695-0.4351i521.229-0.9646i531.3962-0.702i540.9999-0.8909i551.1576-0.6802i560.9854-0.0994i570.9486-0.2947i581.151-0.1088i591.111-0.3299i

600.7523-0.6302i610.868-0.4747i620.8846-0.7348i631.0176-0.5463i64-0.046016-0.19928i65-0.04169-0.31873i66-0.0572-0.5009i67-0.1248-0.4458i68-0.16186-0.20686i69-0.1953-0.26857i70-0.3301-0.3896i71-0.244-0.4019i72-0.0794-0.8118i73-0.2342-0.7783i74-0.0689-0.6496i75-0.1934-0.6217i76-0.5135-0.6336i77-0.3795-0.7192i78-0.4174-0.513i79-0.3054-0.5754i80-0.062247-0.063157i

81-0.37711-0.060045i82-0.5724-0.0565i83-0.4995-0.1254i84-0.1901-0.072644i85-0.30737-0.13397i86-0.4187-0.3189i87-0.4342-0.2296i88-0.8377-0.087i89-0.8035-0.2531i90-0.6985-0.078i91-0.657-0.2093i92-0.6336-0.5265i93-0.734-0.4i94-0.5232-0.4192i95-0.6021-0.3168i96-0.171-1.5654i97-0.4862-1.4888i98-0.1173-1.3402i99-0.3546-1.294i100-1.0161-1.1857i101-0.7659-1.3596i

102-0.8079-1.065i103-0.5887-1.2003i104-0.0947-0.9738i105-0.2795-0.9338i106-0.1114-1.146i107-0.3287-1.0979i108-0.6125-0.7588i109-0.4536-0.8607i110-0.7204-0.8902i111-0.5336-1.0118i112-1.5611-0.1362i113-1.5001-0.4134i114-1.3345-0.1491i115-1.2695-0.4351i116-1.229-0.9646i117-1.3962-0.702i118-0.9999-0.8909i119-1.1576-0.6802i120-0.9854-0.0994i121-0.9486-0.2947i122-1.151-0.1088i

123-1.111-0.3299i124-0.7523-0.6302i125-0.868-0.4747i126-0.8846-0.7348i127-1.0176-0.5463i1280.046016+0.19928i1290.04169+0.31873i1300.0572+0.5009i1310.1248+0.4458i1320.16186+0.20686i1330.1953+0.26857i1340.3301+0.3896i1350.244+0.4019i1360.0794+0.8118i1370.2342+0.7783i1380.0689+0.6496i1390.1934+0.6217i1400.5135+0.6336i1410.3795+0.7192i1420.4174+0.513i1430.3054+0.5754i

1440.062247+0.063157i1450.37711+0.060045i1460.5724+0.0565i1470.4995+0.1254i1480.1901+0.072644i1490.30737+0.13397i1500.4187+0.3189i1510.4342+0.2296i1520.8377+0.087i1530.8035+0.2531i1540.6985+0.078i1550.657+0.2093i1560.6336+0.5265i1570.734+0.4i1580.5232+0.4192i1590.6021+0.3168i1600.171+1.5654i1610.4862+1.4888i1620.1173+1.3402i1630.3546+1.294i1641.0161+1.1857i

1650.7659+1.3596i1660.8079+1.065i1670.5887+1.2003i1680.0947+0.9738i1690.2795+0.9338i1700.1114+1.146i1710.3287+1.0979i1720.6125+0.7588i1730.4536+0.8607i1740.7204+0.8902i1750.5336+1.0118i1761.5611+0.1362i1771.5001+0.4134i1781.3345+0.1491i1791.2695+0.4351i1801.229+0.9646i1811.3962+0.702i1820.9999+0.8909i1831.1576+0.6802i1840.9854+0.0994i1850.9486+0.2947i

1861.151+0.1088i1871.111+0.3299i1880.7523+0.6302i1890.868+0.4747i1900.8846+0.7348i1911.0176+0.5463i192-0.046016+0.19928i193-0.04169+0.31873i194-0.0572+0.5009i195-0.1248+0.4458i196-0.16186+0.20686i197-0.1953+0.26857i198-0.3301+0.3896i199-0.244+0.4019i200-0.0794+0.8118i201-0.2342+0.7783i202-0.0689+0.6496i203-0.1934+0.6217i204-0.5135+0.6336i205-0.3795+0.7192i206-0.4174+0.513i

207-0.3054+0.5754i208-0.062247+0.063157i209-0.37711+0.060045i210-0.5724+0.0565i211-0.4995+0.1254i212-0.1901+0.072644i213-0.30737+0.13397i214-0.4187+0.3189i215-0.4342+0.2296i216-0.8377+0.087i217-0.8035+0.2531i218-0.6985+0.078i219-0.657+0.2093i220-0.6336+0.5265i221-0.734+0.4i222-0.5232+0.4192i223-0.6021+0.3168i224-0.171+1.5654i225-0.4862+1.4888i226-0.1173+1.3402i227-0.3546+1.294i

228-1.0161+1.1857i229-0.7659+1.3596i230-0.8079+1.065i231-0.5887+1.2003i232-0.0947+0.9738i233-0.2795+0.9338i234-0.1114+1.146i235-0.3287+1.0979i236-0.6125+0.7588i237-0.4536+0.8607i238-0.7204+0.8902i239-0.5336+1.0118i240-1.5611+0.1362i241-1.5001+0.4134i242-1.3345+0.1491i243-1.2695+0.4351i244-1.229+0.9646i245-1.3962+0.702i246-0.9999+0.8909i247-1.1576+0.6802i248-0.9854+0.0994i

249-0.9486+0.2947i250-1.151+0.1088i251-1.111+0.3299i252-0.7523+0.6302i253-0.868+0.4747i254-0.8846+0.7348i255-1.0176+0.5463i