Title :
Data rate enhancement of VDSL via termination impedance matching
Author :
Schwan, Martin A K ; LoCicero, Joseph L.
Author_Institution :
Zebra Technol. Inc, Vernon Hills, IL, USA
Abstract :
Impedance mismatch due to bridge taps is a data rate limiting factor in DSL systems including VDSL. Three impedance matching approaches are investigated for VDSL transmission through twisted-pair subscriber lines. Mathematical modelling of heterogeneous twisted-pair transmission lines is discussed and forms the basis for termination impedance dependent received signal-to-noise ratio computations. Several subscriber line and bridge tap lengths are examined. Results indicate improvements in channel capacity up to 40% for cables with bridge taps that produce detrimental in-band frequency s.
Keywords :
channel capacity; digital subscriber lines; impedance matching; twisted pair cables; VDSL; bridge taps; channel capacity; data rate enhancement; heterogeneous twisted-pair lines; in-band frequency s; signal-to-noise ratio computations; subscriber line; termination impedance matching; twisted-pair subscriber lines; Background noise; Bridges; Circuits; Crosstalk; DSL; Frequency; Impedance matching; Quadrature amplitude modulation; Signal to noise ratio; Transmitters;
Conference_Titel :
Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on
Print_ISBN :
0-7803-7523-8
DOI :
10.1109/MWSCAS.2002.1187089
