적응 다단 시스템 식별 알고리듬을 이용한 새로운 반향제거기
New Echo Canceller using Adaptive Cascaded System Identification Algorithm
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초록
In this paper, I present a new echo canceller using the adaptive cascade systemidentification (CSI) method, which a system response is divided into several responses sothat each response is adaptively estimated and combined. Echo cancellation is required for adual-duplex 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 highlinearity and total echo return loss in excess of 70 dB. Especially, for a fickle response, if theresponse is estimated by an adaptive filter, the filter needs more taps and the performanceis decreased. But the response is divided into several responses, the computationcomplexities are decreased and the performance is increased. For the stage constant n, whichrepresents the number of stages, if the response is not divided (n=1), the computationcomplexity of multiply is 2N² . And if the response is divided into two responses (n=2), thecomputation complexity of multiply is N² . Also, if n=3, the computation complexity is 2/3N² . Therefore, it is known that the computation complexity is decreased as n is increased. Finally, this proposed method is verified through simulation of echo canceller for digitalsubscriber line (DSL) application.
Abstract
In this paper, I present a new echo canceller using the adaptive cascade systemidentification (CSI) method, which a system response is divided into several responses sothat each response is adaptively estimated and combined. Echo cancellation is required for adual-duplex 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 highlinearity and total echo return loss in excess of 70 dB. Especially, for a fickle response, if theresponse is estimated by an adaptive filter, the filter needs more taps and the performanceis decreased. But the response is divided into several responses, the computationcomplexities are decreased and the performance is increased. For the stage constant n, whichrepresents the number of stages, if the response is not divided (n=1), the computationcomplexity of multiply is 2N² . And if the response is divided into two responses (n=2), thecomputation complexity of multiply is N² . Also, if n=3, the computation complexity is 2/3N² . Therefore, it is known that the computation complexity is decreased as n is increased. Finally, this proposed method is verified through simulation of echo canceller for digitalsubscriber line (DSL) application.
참고문헌 (10)
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