国产在线中文字幕亚洲,一区视频国产精品观看,欧美日韩国产高清片,久久久久久AV无码免费网站,亚洲无码一二三四五区,日韩无码www.,sese444

鎮ㄥソ锛屾杩庝締(l谩i)鍒扮董搴�(k霉)闆诲瓙甯傚牬(ch菐ng)缍�(w菐ng) 鐧婚寗 | 鍏嶈不(f猫i)娉ㄥ唺(c猫)

BCH纰�
闁辫畝锛�17731鏅�(sh铆)闁擄細2011-05-03 17:41:41

    BCH纰硷紙BCH code锛夛紝鏄惊鐠�(hu谩n)纰肩殑涓�鍊�(g猫)閲嶈瀛愰锛岀敤浜庣尘閷�(cu貌)锛岀壒鍒ラ仼鐢ㄤ簬闅ㄦ(j墨)宸尟(cu貌)鏍℃鐨勫惊鐠�(hu谩n)妾㈤(y脿n)纰笺�侭CH纰兼湁鍤�(y谩n)瀵嗙殑浠ｆ暩(sh霉)鐞嗚珫锛屾槸鐩墠鐮旂┒鏈�閫忓竟鐨勪竴椤炵⒓銆傚畠鐨勭敓鎴愬闋�(xi脿ng)寮忚垏鏈�灏忕⒓璺濅箣闁撴湁瀵嗗垏鐨勯棞(gu膩n)绯�锛屼汉鍊戝彲浠ユ牴鎿�(j霉)鎵�瑕佹眰鐨勭尘閷�(cu貌)鑳藉姏t寰堝鏄撴(g貌u)閫犲嚭BCH纰�锛屽畠鍊戠殑璀⒓鍣�涔熷鏄撳(sh铆)鐝�(xi脿n)锛屾槸绶氭�у垎绲勭⒓涓噳(y墨ng)鐢ㄦ渶鏅亶鐨勪竴椤炵⒓銆傜敱R. C. Bose銆丏. K. Chaudhuri鍜孉. Hocquenghem鍏卞悓鎻愬嚭銆�

姒傝堪

    BCH纰�鍙栬嚜 Bose銆丷ay-Chaudhuri 鑸� Hocquenghem 鐨勭府瀵�(xi臎)锛屾槸鑷�1959骞寸櫦(f膩)灞曡捣渚�(l谩i)鐨勪竴绋兘绯炬澶氫綅閷�(cu貌)瑾ょ殑寰挵(hu谩n)纰硷紝鏄法纰肩悊璜栧挨鍏舵槸绯鹃尟(cu貌)纰间腑鐮旂┒寰楁瘮杓冨鐨勪竴绋法纰兼柟娉�銆傜敤琛�(sh霉)瑾�(y菙)渚�(l谩i)瑾�(shu艒)锛孊CH 纰兼槸鐢ㄤ簬鏍℃澶氬��(g猫)闅ㄦ(j墨)閷�(cu貌)瑾ゆā寮忕殑澶氱礆(j铆)銆佸惊鐠�(hu谩n)銆侀尟(cu貌)瑾ゆ牎姝�銆佽畩闀�(zh菐ng)鏁�(sh霉)瀛楃法纰�銆侭CH 纰间篃鍙互鐢ㄤ簬璩�(zh矛)鏁�(sh霉)绱�(j铆)鎴栬�呰唱(zh矛)鏁�(sh霉)鐨勫啰绱�(j铆)鐨勫绱�(j铆)鐩哥Щ閸垫帶銆�11 绱�(j铆)鐨� BCH 纰煎凡缍�(j墨ng)鐢ㄤ簬琛ㄧず 10 閫�(j矛n)鍒舵暩(sh霉)澶栧姞涓�鍊�(g猫)绗﹁櫉(h脿o)浣�銆�

    BCH纰兼槸涓�椤為噸瑕佺殑绯鹃尟(cu貌)纰�锛屽畠鎶婁俊婧愬緟鐧�(f膩)鐨勪俊鎭簭鍒楁寜鍥哄畾鐨勎轰綅涓�绲勫妰鍒嗘垚娑堟伅绲�,鍐嶅皣姣忎竴娑堟伅绲勭崹(d煤)绔嬭畩鎻涙垚闀�(zh菐ng)鐐簄(n锛炍�)鐨勪簩閫�(j矛n)鍒舵暩(sh霉)瀛楃祫,绋辩偤纰煎瓧銆傚鏋滄秷鎭祫鐨勬暩(sh霉)鐩偤M(椤劧M鈮�2),鐢辨鎵�鐛插緱鐨凪鍊�(g猫)纰煎瓧鐨勫叏楂斾究绋辩偤纰奸暦(zh菐ng)鐐簄銆佷俊鎭暩(sh霉)鐩偤M鐨勫垎绲勭⒓,瑷樼偤n锛孧銆傛妸娑堟伅绲勮畩鎻涙垚纰煎瓧鐨勯亷(gu貌)绋嬬ū鐐虹法纰�锛屽叾閫嗛亷(gu貌)绋嬬ū鐐鸿纰�銆�

甯歌(ji脿n)绋

    1銆佹垐闆风⒓锛圙olay锛�

    锛�23锛�12锛夌⒓鏄竴鍊�(g猫)鐗规畩鐨勯潪鏈師BCH纰硷紝绋辩偤鎴堥浄纰�锛屽畠鐨勬渶灏忕⒓璺�7锛岃兘绯炬3鍊�(g猫)閷�(cu貌)瑾わ紝鍏剁敓鎴愬闋�(xi脿ng)寮忕偤銆傚畠涔熸槸鐩墠鐐烘鐧�(f膩)鐝�(xi脿n)鐨勮兘绯炬澶氬��(g猫)閷�(cu貌)瑾ょ殑瀹屽倷纰笺��

    2銆佹摯(ku貌)灞曞舰寮�

    瀵�(sh铆)闅涙噳(y墨ng)鐢ㄤ腑锛岀偤浜嗗緱鍒板伓鏁�(sh霉)纰奸暦(zh菐ng)锛屽苟澧炲姞妾㈤尟(cu貌)鑳藉姏锛屽彲浠ュ湪BCH纰肩殑鐢熸垚澶氶爡(xi脿ng)寮忎腑涔楧+1锛屽緸鑰屽緱鍒帮紙n+1锛宬+1锛夋摯(ku貌)灞旴CH纰�銆傛摯(ku貌)灞旴CH纰肩浉鐣�(d膩ng)浜庡皣鍘熸湁BCH纰煎啀鍔犱笂涓�浣嶇殑鍋舵牎椹�(y脿n)锛屽畠涓嶅啀鏈夊惊鐠�(hu谩n)鎬�銆�

    3銆佺府鐭舰寮�

    骞句箮鎵�浠ョ殑寰挵(hu谩n)纰奸兘瀛樺湪瀹冨彟涓�绋府鐭舰寮忋�傚(sh铆)闅涙噳(y墨ng)鐢ㄤ腑锛屽彲鑳介渶瑕佷笉鍚岀殑纰奸暦(zh菐ng)涓嶆槸鎴栧畠鐨勫洜瀛�锛屾垜鍊戝彲浠ュ緸纰间腑鎸戝嚭鍓峴浣嶇偤0鐨勭⒓绲勬(g貌u)鎴愭柊鐨勭⒓锛岄�欑ó纰肩殑鐩�(ji膩n)鐫ｄ綅鏁�(sh霉)涓嶈畩锛屽洜姝ょ尘閷�(cu貌)鑳藉姏淇濇寔涓嶈畩锛屼絾鏄矑(m茅i)鏈変簡寰挵(hu谩n)鎬�銆�

妲�(g貌u)寤�

    BCH 纰间娇鐢ㄦ湁闄愬煙涓婄殑鍩熻珫鑸囧闋�(xi脿ng)寮忋�傜偤浜嗘娓�(c猫)閷�(cu貌)瑾ゅ彲浠ユ(g貌u)寤轰竴鍊�(g猫)妾㈡脯(c猫)澶氶爡(xi脿ng)寮�锛岄�欐ǎ鎺ユ敹绔氨鍙互妾㈡脯(c猫)鏄惁鏈夐尟(cu貌)瑾ょ櫦(f膩)鐢�銆�

    瑕佹(g貌u)寤轰竴鍊�(g猫)鑳藉妾㈡脯(c猫)銆佹牎姝ｅ叐鍊�(g猫)閷�(cu貌)瑾ょ殑 BCH 纰�锛屾垜鍊戣浣跨敤鏈夐檺鍩� GF(16) 鎴栬�� Z2[x]锛�<x4 + x + 1>銆傚鏋� 伪 鏄� m1(x) = x4 + x + 1 鐨勪竴鍊�(g猫)鏍�锛岄偅涔� m1 灏辨槸 伪 鐨勬サ灏忓闋�(xi脿ng)寮忥紝閫欐槸鍥�?y脿n)?/FONT>

    m1(x) = (x - 伪)(x - 伪2)(x - 伪4)(x - 伪8)=x4 + x + 1銆�

    濡傛灉瑕佹(g貌u)寤轰竴鍊�(g猫)鑳藉绯炬涓�鍊�(g猫)閷�(cu貌)瑾ょ殑 BCH 纰�锛岄偅涔堝氨浣跨敤 m1(x)锛岄�欏��(g猫)浠ｇ⒓灏辨槸鎵�鏈夋豢瓒�

    C(x) 鈮� 0锛坢od m1(x)锛変笖鏍圭偤 伪, 伪2, 伪4, 伪8 鐨勫闋�(xi脿ng)寮� C(x)銆�

瑙ｇ⒓

    BCH 鐨勮В纰奸亷(gu貌)绋嬪彲浠ュ垎鐐轰互涓嬪洓姝�

    1銆佽▓(j矛)绠楁帴鏀跺埌鐨勫悜閲� R 鐨� 2t 浼撮毃鐭╅櫍

    2銆佽▓(j矛)绠楅尟(cu貌)瑾ゅ畾浣嶅闋�(xi脿ng)寮�

    3銆佽В澶氶爡(xi脿ng)寮�锛屽緱鍒伴尟(cu貌)瑾や綅缃�

    4銆佸鏋滀笉鏄簩閫�(j矛n)鍒� BCH 纰�锛屽氨瑷�(j矛)绠楅尟(cu貌)瑾や綅缃殑瑾ゅ樊鍊�

缍韩(k霉)闆诲瓙閫�锛岄浕瀛愮煡璀�(sh铆)锛屼竴鏌ョ櫨閫�锛�

宸叉敹閷勮姊�168615鍊�(g猫)