Pulse shaping with zipper: spectral compatibility and asynchrony
1998 (English)Report (Other academic)
We have investigated what the effects of adding pulse shaping and windowing to a Zipper-VDSL system would be. By adding short, pulse-shaped wings to the DMT symbol and accepting the, say, 3 % efficiency loss, the spectral sidelobes of the DMT-symbol are reduced. This provides several attractive features including the following: · The pulse shaping in the transmitter reduces the out of band power of the DMT-signal. · The spectral compatibility with other systems such as ADSL and CAP-VDSL is enhanced. · It becomes feasible to use Zipper-VDSL in a time-asynchronous mode, where a VTU-R only synchronizes itself to its VTU-O, while the VTU-R / VTU-O pair may be asynchronous to all other transceiver pairs. · The pulse shaping gives some increase in the depth of spectral notches, for HAM-bands etc. The windowing is a part of a powerful RFI-ingress suppressing method as proposed by John Bingham, Amati.
Place, publisher, year, edition, pages
OceanSide Publications, 1998. , 6 p.
, ANSI Technical Report, T1E1.4/98-041
Research subject Signal Processing
IdentifiersURN: urn:nbn:se:ltu:diva-23985Local ID: 9352def0-e08b-11dc-9e29-000ea68e967bOAI: oai:DiVA.org:ltu-23985DiVA: diva2:997035
Godkänd; 1998; Bibliografisk uppgift: Standards project: T1E1.4: VDSL; 20080221 (ysko)2016-09-292016-09-29Bibliographically approved