闲来无事 : 香农极限带宽计算公式

2008/08/24

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

$C \approx 0.332 \cdot B \cdot \mathrm{SNR (in \ dB)}$

where

$\mathrm{SNR (in \ dB)} = 10\log_{10}{S \over N}$

$C \approx 1.44 \cdot B \cdot {S \over N}$

In this low-SNR approximation, capacity is independent of bandwidth if the noise is white, of spectral density

N 0

watts per hertz, in which case the total noise power is $B \cdot N_0$ .

$C \approx 1.44 \cdot {S \over N_0}$

闲来无事