Article

Frequency Domain Echo Canceller for DMT-Based Systems

IEEE Signal Processing Letters (impact factor: 1.39). 01/2012; DOI:10.1109/LSP.2011.2170679 pp.713 - 716
Source: IEEE Xplore

ABSTRACT This letter addresses echo cancellation for digital subscriber line (DSL) communications with discrete multitone (DMT) modulation. The described adaptive echo canceller operates entirely in the frequency domain. The method allows estimation and subtraction of an echo signal impaired by intercarrier and intersymbol interference present when the impulse response of the echo channel is longer than the cyclic prefix. Implementation aspects for symmetric and asymmetric DMT-based systems are described together with ways to lower the computational complexity. Finally, computer simulation results are presented that validates the proposed method.

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Keywords

asymmetric DMT-based systems
 
computational complexity
 
cyclic prefix
 
digital subscriber line
 
discrete multitone
 
DSL
 
echo signal
 
impulse response
 
intersymbol interference present
 
letter addresses echo cancellation
 
proposed method
 
symmetric