Journal ArticleDOI
Measurement of echo path response
V. Kanchan,E. Gibson +1 more
TLDR
A method is presented to measure the echo path response using pseudonoise sequences and the autocorrelation properties of these sequences are shown to reduce the error in measurement.Abstract:
A method is presented to measure the echo path response using pseudonoise sequences. The autocorrelation properties of these sequences are shown to reduce the error in measurement. The optimal choice of taps to achieve echo cancellation is evaluated. This scheme is compared to the LMS adaptive algorithm. The LMS algorithm can achieve the same level of cancellation with proper choice of mu . However, the number of iterations required has not been considered. The optimum choice of taps is evaluated. >read more
Citations
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Patent
Fast training echo canceller
Fuyun Ling,Guozhu Long +1 more
TL;DR: In this paper, an echo cancellation modem with a fast training echo cancellation was proposed, in which the echo cancellation coefficients were computed by taking correlations between a complex, periodic training signal sequence and a real component of the corresponding echo signal.
Journal ArticleDOI
Fast initialization of data-driven Nyquist in-band echo cancellers
TL;DR: It is shown that the fast training method can also provide the parameters for the fast initialization of the phase roll compensator in the echo canceller, and thus complete theFast training of the entire echo cancellers in a significantly reduced training time.
Proceedings ArticleDOI
Correlation-based fast training of data-driven Nyquist in-band echo cancellers
Fuyun Ling,G. Long +1 more
TL;DR: A novel echo canceller fast training scheme for data-driven 'Nyquist' in-band echo cancellers is presented, which simultaneously estimates the near and far echo canceer coefficients by sending a special periodic training sequence and correlating a segment of the sequence with the real echo samples of the sequences.
Proceedings ArticleDOI
A new complex system identification method and its application to echo canceller fast initialization
G. Long,Fuyun Ling +1 more
TL;DR: A method is proposed for estimating the impulse response of a complex system based on its complex input and only the real part of its output and it is shown that using these techniques, fast and accurate estimation can be achieved efficiently.
Journal ArticleDOI
Fast initialization of Nyquist echo cancelers using circular convolution technique
Minho Cheong,Yong-Hwan Lee +1 more
TL;DR: A method for fast initialization of the echo canceler by using a circular convolution technique that enables the use of real-valued training signals instead of complex-valued ones, resulting in significant reduction of the initialization time as well as the implementation complexity.
References
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Book ChapterDOI
Stationary and nonstationary learning characteristics of the LMS adaptive filter
TL;DR: It is shown that for stationary inputs the LMS adaptive algorithm, based on the method of steepest descent, approaches the theoretical limit of efficiency in terms of misadjustment and speed of adaptation when the eigenvalues of the input correlation matrix are equal or close in value.
Journal ArticleDOI
Adaptive equalization
TL;DR: In this article, the authors give an overview of the current state of the art in adaptive equalization and discuss the convergence and steady-state properties of least mean square (LMS) adaptation algorithms.
Adaptive equalization
TL;DR: This tutorial paper gives an overview of the current state of the art in adaptive equalization and discusses the convergence and steady-state properties of least mean-square (LMS) adaptation algorithms, including digital precision considerations, and three classes of rapidly converging adaptive equalizer algorithms.
Journal ArticleDOI
The spectrum of clipped noise
J. H. Van Vleck,David Middleton +1 more
TL;DR: In this paper, the authors calculate the intensity spectrum to be expected for clipped (also called "limited") noise, where the limiting amplitude is very small compared to the rms amplitude before clipping.
Journal ArticleDOI
Periodic sequences with optimal properties for channel estimation and fast start-up equalization
TL;DR: The problems of fast channel estimation and fast start-up equalization in synchronous digital communication systems are considered from the viewpoint of the optimization of the training sequence to be transmitted.