Broadband communication

This article covers the telecommunications term broadband . For Internet access with high transmission speeds, see Broadband Internet Access .

The term broadband communications (even broadband , English broadband ) describes in the communications engineering a transmission channel whose magnitude frequency response is not constant and in which thus it to signal distortion occurs. In contrast to narrowband channels , broadband channels require channel equalization with adaptive filters in order to compensate for the signal distortions.

In the case of digital data transmission, broadband transmission is specified using the symbol rate . Each transmitted symbol requires a certain symbol duration for transmission . If the symbol duration is significantly shorter than the transmission time on the transmission channel, there is broadband communication: ${\displaystyle T_{\mathrm {s} }}$ ${\displaystyle \tau _{\mathrm {max} }}$

${\displaystyle T_{\mathrm {s} }\ll \tau _{\mathrm {max} }}$

Because of the distortion in the channel, undesired intersymbol interference can occur.

It is essential that the definition of the term broadband is not tied to specific numerical values ​​of a certain bandwidth , but is based on the respective marginal circumstances, such as the physical parameters of a radio link.

literature

• Karl-Dirk Kammeyer , Martin Bossert : message transmission . 5th edition. Vieweg + Teubner, Wiesbaden 2011, ISBN 978-3-834-80896-7 .