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【多选题】
关于平稳随机过程的自相关函数,说法正确的是()。A.
自相关函数在时延等于 0 时的取值代表随机过程的平均功率。
B.
自相关函数在时延等于无穷大时的取值代表随机过程的直流功率。
C.
自相关函数和功率谱密度互为叶变换对。
D.
自相关函数的上界是随机过程的平均功率。
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