Zipper type VDSL system

Details Zipper type VDSL system Zipper type VDSL system

2005-03-01

2005-03-01

Phunkulh, Bob A. (Department: 2661)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000, C375S222000, C375S377000

Reexamination Certificate

active

06862261

ABSTRACT:
Disclosed is a zipper type Very high bit-rate Digital Subscriber Line (VDSL) system which comprises a transmitter including an inverse fast Fourier transformer for performing an inverse fast Fourier transform on input data, and a cyclic extension adder for adding a cyclic extension for each symbol to the data output from the inverse fast Fourier transformer and outputting the data to a transmission channel; and a receiver including a cyclic extension remover for removing the cyclic extension from the data received through the transmission channel, and a fast Fourier transformer for performing a fast Fourier transform on the data output from the cyclic extension remover. The cyclic extension adder copies a first predetermined number of data starting from the leading part of the input symbol data received from the inverse fast Fourier transformer into a first cyclic suffix for removing interference between symbols and maintaining orthogonality between sub-carriers; adds the first cyclic suffix to the end of the symbol data; copies a second predetermined number of data subsequent to the first predetermined number of data into a second cyclic suffix for maintaining orthogonality between upstream and downstream; and adds the second cyclic suffix to the end of the first cyclic suffix.

REFERENCES:
patent: 6181714 (2001-01-01), Isaksson et al.
patent: 6185251 (2001-02-01), Fertner
patent: 6307889 (2001-10-01), Chun
patent: 6320901 (2001-11-01), Arad et al.
patent: 6320903 (2001-11-01), Isaksson et al.
patent: 6408022 (2002-06-01), Fertner
patent: 6590893 (2003-07-01), Hwang et al.
patent: 6687307 (2004-02-01), Anikhindi et al.

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