Filtering elements to meet requirements on power spectral density ( 99 - 429 )

This contribution addresses filtering requirements to meet the ETSI and ANSI specifications on transmit signal power spectral density (PSD) for VDSL systems employing multicarrier modulation techniques. It is shown that the specifications can be met with simple fixed filtering elements. Conformance with the various PSD masks is achieved by proper adjustment of the digital gains at the input of each subchannel. Such filter design is generally difficult for QAM systems unless they have a sufficient number of subchannels. __________________________________________________________________________________ NOTICE This contribution has been prepared to assist Standards Committee T1 Telecommunications. This document is offered to the Committee as a basis for discussion and is not a binding on any of the companies listed as authors. The requirements are subject to change after further study. The authors specifically reserve the right to add to, amend, or withdraw the statements contained herein. 08/20/99 2 T1E1.4/99-429 Filtering elements to meet requirements on power spectral density (99-429) G. Cherubini E. Eleftheriou S. Oelcer IBM Zurich Research Lab. Phone: +41-1-724 84 80 Fax: +41-1-724 89 55 [email protected] [email protected] [email protected] J. Cioffi Dept. EE Stanford University Stanford, CA 94305. Phone: +1-650 723 2525 Fax: +1-650-723 8473 [email protected] M. Sorbara Globespan Tech., 1E-23 100 Schulz Dr. Red Bank, NJ 07701 P: 1-732-345-7535 F: 1-732-345-7598 [email protected]