Journal ArticleDOI
Impulse response shortening for discrete multitone transceivers
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TLDR
Various methods of determining the coefficients for this time-domain finite impulse response (FIR) filter are explored and an optimal shortening and a least-squares approach are developed for shortening the channel's impulse response.Abstract:
In discrete multitone (DMT) transceivers an intelligent guard time sequence, called a cyclic prefix (CP), is inserted between symbols to ensure that samples from one symbol do not interfere with the samples of another symbol. The length of the CP is determined by the length of the impulse response of the effective physical channel. Using a long CP reduces the throughput of the transceiver, To avoid using a long CP, a short time-domain finite impulse response (FIR) filter is used to shorten the effective channels impulse response. This paper explores various methods of determining the coefficients for this time-domain filter. An optimal shortening and a least-squares (LS) approach are developed for shortening the channel's impulse response. To provide a computationally efficient algorithm a variation of the LS approach is explored. In full-duplex transceivers the length of the effective echo path impacts the computational requirements of the transceiver. A new paradigm of joint shortening is introduced and three methods are developed to jointly shorten the channel and the echo impulse responses in order to reduce the length of the CP and reduce computational requirements for the echo canceller.read more
Citations
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Proceedings ArticleDOI
Channel shortening equalization for differential OFDM systems
Xiaoli Ma,L. Song,J. Kleider +2 more
TL;DR: In this article, the authors proposed a channel shortening filter for differential OFDM systems with unknown multipath channels with long delay spreads without introducing extra redundancy, their design shortens the length of the effective channel response and bypasses the channel estimation, thus improving bandwidth and power efficiency.
Journal ArticleDOI
DMT Transmission in SI POF With Minimax Channel Shortening Equalizer
TL;DR: It is shown that the performance of the DMT system in SI POF can be considerably improved by using a time-domain impulse response shortening equalizer, and a new method of calculating the equalizer's coefficients, which employs minimax optimization.
Proceedings ArticleDOI
Multicarrier channel shortening based on second-order output statistics
Teruyuki Miyajima,Zhi Ding +1 more
TL;DR: The paper presents two blind channel shortening algorithms exploiting the second-order statistics of the channel outputs using a shortening equalizer parameter vector chosen from a null-space that forces a length constraint on the effective channel impulse response.
Proceedings ArticleDOI
Convergence and Performance Issues for Autocorrelation Based Adaptive Channel Shortening
TL;DR: Borders on the signal to interference ratio performance of several blind channel shortening designs based on autocorrelation minimization are derived and a convergence result for adaptive versions of these blind designs is provided which can be coupled with the performance results to determine performance of the adaptive designs.
Journal ArticleDOI
Joint window and time domain equalizer design for bit rate maximization in DMT-receivers
TL;DR: A combined equalizer and windowing design procedure to maximize the achievable bit rate in DMT-based modems and it is shown that for the same achievablebit rate, equalizer taps can be exchanged for windowing coefficients to reduce complexity during data transmission.
References
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Journal ArticleDOI
A new look at the statistical model identification
TL;DR: In this article, a new estimate minimum information theoretical criterion estimate (MAICE) is introduced for the purpose of statistical identification, which is free from the ambiguities inherent in the application of conventional hypothesis testing procedure.
Journal ArticleDOI
A discrete multitone transceiver system for HDSL applications
TL;DR: A discrete multitone (DMT) transceiver design for high bit rate digital subscriber line (HDSL) access is presented and analyzed and is an excellent candidate for HDSL implementation.
Proceedings ArticleDOI
Equalizer training algorithms for multicarrier modulation systems
TL;DR: Several algorithms for designing the time-domain equalizer, which use adaptation in the frequency domain and windowing in the time domain in order to minimize the mean squared error of the equalized response, are described.
Proceedings ArticleDOI
A cost-effective maximum likelihood receiver for multicarrier systems
J.S. Chow,John M. Cioffi +1 more
TL;DR: Results indicate that near-optimum performance can be achieved by using the general optimum class of structures derived that includes the decision feedback equalizer and the lesser-known autoregressive moving average filters at a great computational reduction.
Proceedings ArticleDOI
Recursive ladder algorithms for ARMA modeling
TL;DR: In this paper, the extension of the all-pole (AR) exact least-squares ladder algorithms to the pole-zero (ARMA) case is presented, based on a general set of recursions obtained by a geometric approach.
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