香农极限 带宽计算公式

今天在西西河看到了 有人讲香农公式 http://www.ccthere.com/article/696151
不禁要感慨这人太牛了。给我们呈现了一种物理学中简单的美~~~

具体来说

• If S/N >> 1, then

where

• Similarly, if S/N <<>

In this low-SNR approximation, capacity is independent of bandwidth if the noise is white, of spectral density N₀ watts per hertz, in which case the total noise power is .