Journal ArticleDOI
Impulse response shortening for discrete multitone transceivers
Reads0
Chats0
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
More filters
Proceedings ArticleDOI
Adaptive Partial Update Channel Shortening in Impulsive Noise Environments
TL;DR: Adaptive partial update channel shortening algorithms in impulsive noise environments are proposed and have low computational complexity whilst retaining essentially identical performance to the sum-absolute autocorrelation minimization (SAAM) algorithm due to Nawaz and chambers.
Proceedings ArticleDOI
Subband interference suppression in channel shortening for OFDMA downlink systems
TL;DR: This paper first develops the minimum subband interference (MSI) filter which reduces the interference and noise enhancement within the subcarriers of interest, and presents the delay preselection method, which predetermines significant delay candidates on the basis of estimation results.
Proceedings ArticleDOI
DMT Time Domain Equalization Based on ARMA Models
TL;DR: A novel approach for the design of a time domain equalizer for a discrete multi tone (DMT) digital subscriber loop (DSL) modem and suggests a suitable algorithm based on Prony's method for finding appropriate minimum phase channel models which can be inverted to give equalizer blocks.
Proceedings ArticleDOI
QR-RLS based Adaptive channel shortening IIR-TEQ for OFDM Wireless LAN
TL;DR: QR-RLS based IIR adaptive channel TEQ(time domain equalizer) to make the OFDM systems robust for delay spreads exceeding the CP(cyclic prefix) is presented.
Journal Article
Performance Analysis of Per Tone Equalization in DMT-Based Systems
TL;DR: In this paper, the performance and complexity of the Per Tone Equalization (PERTEQ) algorithm is investigated and compared with that of other TEQ algorithms in the presence of additive white Gaussian noise and near end crosstalk.
References
More filters
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.
Related Papers (5)
Equalization for discrete multitone transceivers to maximize bit rate
Optimum finite-length equalization for multicarrier transceivers
Naofal Al-Dhahir,John M. Cioffi +1 more
Efficiently computed reduced-parameter input-aided MMSE equalizers for ML detection: a unified approach
Naofal Al-Dhahir,John M. Cioffi +1 more