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http://dx.doi.org/10.17662/ksdim.2014.10.3.119

Enhanced Adaptive Multi-stage Echo Canceller for High Speed Communications  

Kwon, Oh Sang (고려사이버대학교 전기전자공학과)
Publication Information
Journal of Korea Society of Digital Industry and Information Management / v.10, no.3, 2014 , pp. 119-125 More about this Journal
Abstract
Echo cancellation is required for a dual-duplex high speed communication such as digital subscriber line(DSL), in order to allow each individual loop to operate in a full duplex fashion. Echo cancellation was one of the most difficult aspects of DSL design, requiring high linearity and total echo return loss in excess of 70 dB. For a long and rapidly changing echo response, if the echo is cancelled by an adaptive echo canceller, the echo canceller needs more taps and its performance is decreased. But if the response is divided into several responses, which response is estimated by a adaptive digital filter and combined, the computation complexities are decreased and the performance is increased. Therefore, the adaptive multi-stage echo canceller is proposed to decrease the computation complexity and increase the performance of echo return loss, in which the echo canceller is composed of several stage echo canceller estimating each divided echo response. Through computer simulations, this multi-stage echo canceller is verified to have merits for high speed communications such as DSL application.
Keywords
Multi Stage; Echo Response; Echo Return Loss; Computation Complexity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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