应用科技
應用科技
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YING YONG KE JI
2015年
1期
41-44
,共4页
喷泉码%LT码%串行置信传播算法%短小环%半随机生成法
噴泉碼%LT碼%串行置信傳播算法%短小環%半隨機生成法
분천마%LT마%천행치신전파산법%단소배%반수궤생성법
fountain code%LT code%serial belief propagation algorithm%short ring%semi-random generation method
分析了喷泉码中LT码的生成原理及影响译码性能的因素，生成矩阵中的短小环是影响编译码性能的主要因素，其中，长度为4的短小环对编译码的性能影响最大。提出了一种半随机生成法去除长度为4的短小环的方法。仿真结果表明：去除长度为4的短小环之后，明显改善了喷泉码的性能，降低了译码复杂度，提高了系统性能。
分析瞭噴泉碼中LT碼的生成原理及影響譯碼性能的因素，生成矩陣中的短小環是影響編譯碼性能的主要因素，其中，長度為4的短小環對編譯碼的性能影響最大。提齣瞭一種半隨機生成法去除長度為4的短小環的方法。倣真結果錶明：去除長度為4的短小環之後，明顯改善瞭噴泉碼的性能，降低瞭譯碼複雜度，提高瞭繫統性能。
분석료분천마중LT마적생성원리급영향역마성능적인소，생성구진중적단소배시영향편역마성능적주요인소，기중，장도위4적단소배대편역마적성능영향최대。제출료일충반수궤생성법거제장도위4적단소배적방법。방진결과표명：거제장도위4적단소배지후，명현개선료분천마적성능，강저료역마복잡도，제고료계통성능。
The generation principle and factors affecting decoding performance of LT codes in a fountain code were analyzed, and it was found the short ring of the generator matrix is a major factor affecting the performance of the encoding and decoding, among which a short ring whose length is 4 has the biggest impact on encoding and deco?ding performance. This article presents a semi?random generation method for removing the short ring with a length of 4. Simulation results show that the removal of the short ring with a length of 4 significantly improves the performance of the fountain codes, reduces the decoding complexity and improves the system performance.
