现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
23期
75-79
,共5页
低密度奇偶校验码%二维网格法%码字校验矩阵%斜率集筛选
低密度奇偶校驗碼%二維網格法%碼字校驗矩陣%斜率集篩選
저밀도기우교험마%이유망격법%마자교험구진%사솔집사선
LDPC%2D lattice%codon check matrix%slope set selection
提出了一种基于二维网格法的低密度奇偶校验码(LDPC)构造方法。该方法对斜率集进行更加严格的筛选,利用一组特殊的数列作为斜率子集,该数列中不存在任何三项元素公差相等和任何四项元素公差相等或者成两倍的情况,从而排除线段构成三角形和四边形的可能,突破原有围长8的限制,得到围长为10的LDPC码字,显著提升了误码性能。采用该方法得到的码字校验矩阵具有准循环特性,能保证较低的编译码复杂度。Matlab仿真结果表明,该码在瀑布区域具有良好的性能,同时具有较好的错误平层特性。
提齣瞭一種基于二維網格法的低密度奇偶校驗碼(LDPC)構造方法。該方法對斜率集進行更加嚴格的篩選,利用一組特殊的數列作為斜率子集,該數列中不存在任何三項元素公差相等和任何四項元素公差相等或者成兩倍的情況,從而排除線段構成三角形和四邊形的可能,突破原有圍長8的限製,得到圍長為10的LDPC碼字,顯著提升瞭誤碼性能。採用該方法得到的碼字校驗矩陣具有準循環特性,能保證較低的編譯碼複雜度。Matlab倣真結果錶明,該碼在瀑佈區域具有良好的性能,同時具有較好的錯誤平層特性。
제출료일충기우이유망격법적저밀도기우교험마(LDPC)구조방법。해방법대사솔집진행경가엄격적사선,이용일조특수적수렬작위사솔자집,해수렬중불존재임하삼항원소공차상등화임하사항원소공차상등혹자성량배적정황,종이배제선단구성삼각형화사변형적가능,돌파원유위장8적한제,득도위장위10적LDPC마자,현저제승료오마성능。채용해방법득도적마자교험구진구유준순배특성,능보증교저적편역마복잡도。Matlab방진결과표명,해마재폭포구역구유량호적성능,동시구유교호적착오평층특성。
A LDPC construction method based on 2D lattice method is proposed in this paper. With the method,a strict se?lection of slope sets is carried out to avoid the possibility of forming triangle and quadrangle in configuration. As a result,girth?ten LDPC was accomplished to improve performance significantly instead of girth?eight one known as before. Besides,the resul?ting parity?check matrix has the feature of quasi?cyclic permutation,so that encoding and decoding of these codes can be effi?ciently implemented by using simple shift?registers. The result of simulation with Matlab shows that the proposed code performs excellent in the waterfall region and has good error floor property.