修正后非相关的阴影标准差较相关时变大，而且随着相关系数和干扰源个数的增加而增大。
The modified standard deviation is generally larger than the original one and increases with the correlation coefficient between lognormal interferers and with the number of interferers.
导出了相应的标准差修正公式。
导出了相应的标准差修正公式。
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