sum product meaning in English

和积

The nation is concerned now that history ambient condition , outcome sum product settles , and and be a real environment , conditional more important one kind of refraction reporting
摘要民族关系是历史环境、条件的产物和积淀，更是现实环境、条件的一种折射。
( 3 ) combined with probability statistic knowledge , introduce the basic theory of message passing algorithm ; analyse the classical decoding algorithm of ldpc codes , including sum product algorithm which based on probability and llr , and min sum algorithm . ( 4 ) research message passing process on the tree ; according spa , turn the flooding schedule to serial schedule based on c - nodes and v - nodes , namely serial algorithm and , analyse de and complexity ; simulations show that the both serial algorithms could improve decoding performance , improve convergence property , reduce complexity
( 4 )研究了和积译码算法在树上的消息传递过程;在ldpc码经典译码算法基础上,将洪水消息传递机制转换成基于校验节点的串行消息传递机制和基于变量节点的消息传递机制,分别对应串行译码算法和串行译码算法,并对密度进化和译码复杂度等方面进行分析;仿真结果表明,两种串行译码算法都使译码性能得到明显提高,改善了消息收敛特性,降低了译码复杂度。