Theoretical and practical limits of next-generation high-speed digital subscriber loops

Author

Shalash, Ahmed F. ; Takatori, Hiroshi

Author_Institution

ADC Telecommun. Inc., Minneapolis, MN, USA

Volume

48

Issue

9

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

1447

Lastpage

1450

Abstract

For the single-pair HDSL (HDSL2), the concept of having different upstream and downstream power spectral densities is highlighted. The signal-to-noise ratio (SNR) at the input of the central office HDSL terminal unit (HTU-C) can be enhanced by boosting the power output of the remote user HDSL terminal unit (HTU-R). Further improvement in performance can be achieved by reducing the HTU-C NEXT interference. Two techniques are proposed to reach this goal. The first approach is to reduce the HTU-C transmitter power in the downstream direction for shorter reach cables. The second approach is borrowed from the analog frequency-modulation preemphasis/deemphasis frequency tilting in the upstream direction. Combining the three techniques leads to at least 6-dB SNR margin improvement for the full reach carrier serving area loops

Keywords

digital subscriber lines; interference suppression; 6 dB; HDSL2; HTU-C NEXT interference; HTU-C transmitter power; HTU-R; analog frequency-modulation preemphasis/deemphasis frequency tilting; central office HDSL terminal unit; downstream power spectral densities; full reach carrier serving area loops; next-generation high-speed digital subscriber loops; power output; remote user HDSL terminal unit; signal-to-noise ratio; single-pair HDSL; stream power spectral densities; Cables; Central office; Channel capacity; Crosstalk; DSL; Delay; Frequency; Signal to noise ratio; Subscriber loops; Transmitters;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.870007

Filename

870007