Orthogonal LMS algorithms for fast line echo canceler training

Details Orthogonal LMS algorithms for fast line echo canceler training Orthogonal LMS algorithms for fast line echo canceler training

1997-03-31

1999-06-01

Hsu, Alpus H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

370286, 370292, 379410, H04B 323, H04M 908

Patent

active

059094265

ABSTRACT:
An echo canceler for calculating an echo impulse response during a training sequence, wherein a sequence of data samples is selected such that a full rank data correlation matrix comprised of such data samples is diagonal at the Nth iteration. The echo canceler estimates the echo impulse response based on such data samples and an echo generated during the training sequence using a normalized least means square algorithm, wherein the length of the data sequence to sound the echo channel is N. This normalized LMS algorithm, wherein the data sequence is specifically selected, converges toward an echo impulse response much faster than standard LMS algorithms, while having a computational complexity comparable to that of the standard LMS algorithm.

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IEEE article, entitled Polyphase Codes With Good Periodic Correlation Properties by David C. Chu.
Chapter 9 entitled, "Echo Cancellation" from Data Communications Principles by Richard D. Gitlin, Jeremiah F. Hayes, and Stephen B. Weinstein.
Rohrs, U. et al., CAZAC Code Tracking Loop, COMSIG 90, Johannesburg, pp. 142-146, 1990.

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