摘要
本文通过q对元n长码的方差的分析 ,通过定义函数δ(xi,yi) ,给出了q元n长码的方差的下界 同时当码字数为 2k - 1 (k∈N)时 。
In this paper,by using the variance,we study q-ary code C with length n and number of codewords M.By the definition of function δ(x i,y i),We give the lower bound of the variance for q-ary code C with length n.At the same time,when the numbers of code are 2k-1(k∈N), the lower bound can be touched.
