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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TL;DR: This document would like to discuss in detail the current state of the research into Frequency Domain EQualizer, and some of the technologies used in it.
Journal ArticleDOI
Channel Shortening: Inter-Block Interference Suppression in OFDM Transmission@@@-OFDM伝送におけるブロック間干渉抑圧-
Decision Directed and Constant Modulus Algorithms Derived and Evaluated for Multicarrier Systems
TL;DR: Results are presented showing that MCDD and MCCM perform worse than a MC-Trained (MCT) approach, but better than both Multicarrier Equalization by Restoration of Redundancy (MERRY) and Carrier Nulling Algorithm (CNA).
Patent
Method and apparatus for removing crosstalk and other interference in communications systems
TL;DR: In this article, an approach for estimating and removing crosstalk and other interference in a communications receiver is described. But the approach is not suitable for the case of wireless networks, where the receiver samples the received signal at a rate N times the required sampling rate, and splits the signal into N separate observation sequences.
Proceedings ArticleDOI
SINR maximization approach for partial equalization in OFDM systems
TL;DR: Computer simulations show that when the CIR interval is longer than the CP interval, the TEQ designed based on the MSINR method improves the performance of the OFDM system significantly in comparison with the system without an equalizer.
References
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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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