Bit allocation

from Wikipedia, the free encyclopedia

The bit allocation (also bit allocation is) the allocation of individual bits to modulation channels at certain modulation method , the plurality of channels next to each other use ( QAM , DMT , OFDM ). The reason for this is the different quality of the individual channels (frequencies), for example due to external interference such as line crosstalk . The relationship between the useful signal and interference ( signal-to-noise ratio SNR) is determined for each channel . The better this ratio, the more densely a channel is used; if the ratio is worse, a channel is used less intensively or not at all.

Typically that is bit allocation for ADSL used here the channels are measured during initialization and thereby determine the utilization of the channels.

literature

  • Udo Zölzer: Digital audio signal processing. 2nd edition, BG Teubner Verlag, Stuttgart 1997, ISBN 978-3-322-96770-1 .
  • Martin Werner: communications engineering. An introduction to all courses, 8th edition, Springer Fachmedien, Wiesbaden 2017, ISBN 978-3-8348-2580-3 .
  • Martin Meyer: communication technology. Concepts of modern communication, Friedrich Vieweg & Sohn Verlag, Wiesbaden 1999, ISBN 978-3-322-93895-4 .
  • Peter Adam Höher: Basics of digital information transfer. 2nd edition, Springer Fachmedien, Wiesbaden 2013, ISBN 978-3-8348-1784-6 .

Web links