载波 — 电信 — LexiconDream

〰️ 载波

一种通过调制传递信息的波形。

载波是一种通过调制来承载信息的波形。它是一种稳定的高频信号。载波本身不携带任何信息。但当它的振幅、频率或相位发生变化时，它就能承载数据。载波是载体，调制则是信息。

载波广泛应用于无线电、电视、Wi-Fi 和蜂窝网络。例如，一个广播电台以固定频率（比如 100.1 MHz）进行广播，这就是载波。音频信号调制载波，接收器调谐到载波频率并提取音频信号。如果没有载波，信号就无法有效地在空气中传播。

调制类型

载波必须足够强才能到达接收器。它们的频率必须在接收器可以调谐的范围内。它们不能干扰其他载波。载波是无线通信的基础，其他一切都建立在其上。

Comments (3)

Terry Wells September 1, 2026

AM and FM radio use carrier waves differently. AM varies the amplitude, FM varies the frequency. Once you get that it all makes sense.
Jasmine K. June 6, 2026

So the carrier wave itself doesn't carry information, it's the modulation that does? The definition could be clearer on that.
Ed Norton January 23, 2026

Old school radio tech but still fundamental to how wireless communication works today.