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µç×ÓÐÅÏ¢¹¤³Ì±ÏÒµÂÛÎÄ·¶ÎÄ Ä¿Â¼ ÕªÒªI ABSTRACTII µÚ1Õ Ð÷ÂÛ- 1 - 1.1 ¿ÎÌâÉè¼Æ±³¾°ÒâÒå- 1 - 1.2 ¿ª·¢»·¾³¼°Éè¼Æ¹¤¾ß- 2 - 1.2.1 ¿ª·¢»·¾³½éÉÜ- 2 - 1.2.2 FPGA¼°ÆäÉè¼Æ·½·¨- 3 - µÚ2Õ ѭ»·ÂëÒëÂëÔ­Àí- 6 - 2.1 ÏßÐÔ·Ö×éÂëµÄ»ù±¾¸ÅÄî- 6 - 2.2 Ñ­»·ÂëµÄ»ù±¾¸ÅÄî- 6 - 2.2.1 Ñ­»·ÂëµÄ¶àÏîʽÃèÊö- 6 - 2.2.2 Ñ­»·ÂëµÄ¾ØÕóÃèÊö- 7 - 2.2.3 Ñ­»·ººÃ÷Âë- 8 - 2.3Ñ­»·ÂëµÄÒëÂëÔ­Àí- 8 - µÚ3Õ ´óÊýÂß¼­ÒëÂëÆ÷µÄ×ÜÌåÉè¼Æ- 11 - 3.1 ´óÊýÂß¼­ÒëÂëÔ­Àí- 11 - 3.2 ¢òÐͶþ²½´óÊýÂß¼­ÒëÂëÆ÷Ô­Àí- 13 - 3.3 ¢òÐͶþ²½´óÊýÂß¼­ÒëÂëÆ÷¹¤×÷²½Öè·ÖÎö- 14 - µÚ4Õ ´óÊýÂß¼­ÒëÂëÆ÷µÄµç·Éè¼Æ- 16 - 4.1 ÒëÂëµç·Öпª¹ØµÄÉè¼Æ- 16 - 4.2 ÕûÌåµç·ʵÏÖ¼°Ê±Ðò·ÖÎö- 17 - 4.2.1 µç·±àÒ뼰ʱÐòÊä³ö- 17 - 4.2.2 Êý¾ÝÑéÖ¤- 18 - 4.3 ÒëÂëµç·µÄÍêÉÆ- 19 - 4.4 ÒëÂëµç·µÄÁ¬ÐøÒëÂë- 21 - 4.5 ±¾ÕÂС½á- 21 - µÚ5Õ ½áÂÛ- 22 - ÖÂл- 23 - ²Î¿¼ÎÄÏ×- 24 - ÕªÒª ±¾ÎĽéÉÜÁËÒ»ÖÖ´óÊýÂß¼­ÒëÂë·¨¡ª¡ª×¼Õý½»¶þ²½´óÊýÂß¼­ÒëÂë·¨¡£Ëü¿Ë·þÁË´óÊýÂß¼­ÒëÂë·¨´æÔڵĶÔÂëµÄÒªÇó¹ýÓÚÑϸñ,ÒÔ¼°Ó¦Ó÷¶Î§Ð¡µÄȱµã¡£ÎÄÖиø³öÁËÂëµÄ×¼Õý½»µÄ¶¨Òå,¸ø³öÁË×¼Õý½»¶þ²½´óÊýÂß¼­ÒëÂëµÄ»ù±¾Ë¼Ï롢ͨÓâòÐÍ×¼Õý½»¶þ²½´óÊýÂß¼­ÒëÂëÆ÷µÄ¿òͼºÍÒëÂë·½·¨,²¢ÒÔ(7,4)Ñ­»·ÂëΪÀýÌÖÂÛÁËÕâÖÖÒëÂë·½·¨,½á¹û±íÃ÷,ÕâÖÖÒëÂë·½·¨ÍØ¿íÁË´óÊýÂß¼­ÒëÂë·¨µÄÓ¦Ó÷¶Î§,¶ÔÊý×Ö´«ÊäÓÐʵÓÃÒâÒå¡£ Ó봫ͳµÄÒëÂëËã·¨Ïà±È£¬¸ÃËã·¨¾ßÓÐÒëÂëËٶȿ졢Ӳ¼þʵÏÖ¸´ÔӶȵ͵ÈÓŵ㣬´Ó¶øʹµÃ¸ÃÒëÂëÆ÷¾ßÓÐËٶȿ졢ÐÔÄÜÎȶ¨µÈÌص㡣 ¹Ø¼ü´Ê£ºÒëÂ룬ÃÅÏÞÒëÂ룬´óÊýÂß¼­ÒëÂë ABSTRACT This paper presents a threshold decoding algorithm which is called as a quasi-orthognal two-step majority-logic decoding algorithm. The algorithm overcomes the threshold decoding algorithm shortcoming-too strict requirement for codes and narrow scope of application. The paper gives the definition of the quasi-orthognal and a basic idea of quasi-orthognal two-step majority-logic decoding, as well as block diagrams for type-¢òdecoders and decoding processes. Combine with(7,4) circulate code for the example discussed this kind of to translate the code method, the result enunciation, this kind of application that translated the code method to open widely big few logicses to translate the code method, the logarithms word delivers practical meaning. With the traditional algorithm, the algorithm is fast decoding and hardware complexity several advantages, thus enabling the decoder is fast, stable performance characteristics. Keywords£ºDecoding, Threshold decoder, Majority-logic decoding
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