A multi-carrier echo canceller based on symmetric decomposition

Author

Pisoni, Fabio ; Bonaventura, Marco

Author_Institution

ST Microelectronics, Agrate Brianza, Italy

fYear

2005

fDate

2-4 Nov. 2005

Firstpage

233

Lastpage

238

Abstract

Echo cancellation in DMT modems is a means to improve transmission performance. It consists in extending the downstream (DS) and upstream (UP) frequency bands so that they become adjacent or even overlap, and relaxing at the same time the existing filters. Modern cancellers make use of FIR filters that emulate the echo-path, and adaptive algorithms that estimate the correspondent coefficients. In this article, we start from the circulant decomposition canceller (CDC), an efficient algorithm recently developed for ADSL, and explore new kinds of decomposition, based on the diagonalization properties of the discrete cosine and sine transforms (DCT, DST).

Keywords

FIR filters; digital subscriber lines; discrete cosine transforms; echo suppression; modems; ADSL; FIR filters; circulant decomposition canceller; diagonalization properties; discrete cosine transforms; discrete sine transforms; downstream frequency bands; echo cancellation; multicarrier echo canceller; symmetric decomposition; upstream frequency bands; DSL; Data models; Digital modulation; Discrete Fourier transforms; Echo cancellers; Finite impulse response filter; Frequency; Microelectronics; Modems; OFDM modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Systems Design and Implementation, 2005. IEEE Workshop on

ISSN

1520-6130

Print_ISBN

0-7803-9333-3

Type

conf

DOI

10.1109/SIPS.2005.1579871

Filename

1579871