通信原理：带宽及传输速率

Question

Assume that an analogue musical signal has amplitude varying between -4 V and
4 V and average signal power 8 W. It is sampled at rate 44.1 kHz, quantised into
65536 levels, modulated by PCM and transmitted in real time through an optical
fibre of channel bandwidth 16 kHz.

a) What is the transmission rate? How many Megabytes of data can be
transmitted in 5 minutes?

b)Assume that the channel contains additive white Gaussian noise (AWGN)
only. What is the maximum allowable single-sided power spectral density
(N0) of the AWGN to achieve reliable communication through the channel?

Answer 1

您好，宽带和传输速率是不同的概念。宽带是通道传输信息的能力，而传输速率是单位时间内在通道中传输的信息量。宽带表示频带宽度。宽带也表示通信线路所能传送数据的能力，即在单位时间内从网络中的某一点到另一点所能通过的“最高数据率”。数据传输速率是指每秒钟传送的二进制脉冲的信息量，单位通常是bit/s，是衡量单位时间内选录传输的二进制位的数量，衡量的是线路传送信息的能力。谢谢。