Shannon says

摘要

Ce shannon, pioneer of the information age, says that the ultimate information-carrying capacity of a band-limited communications channel varies in proportion to its bandwidth and also as a function of the SNR within the channel. Given signal power S, total-received-noise power N, and channel bandwidth B (hertz), Shannon's famous theorem (Reference 1) provides this upper boundary for the capacity C of a digital channel in bits per second: C= B log_2(1+(S/N))