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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Patent
Methods and apparatuses of measuring impulse noise parameters in multi-carrier communication systems
TL;DR: In this article, a method and apparatus for measuring and tracking the impulse noise parameters in a communication system is described, the method includes estimating one or more parameters of the impulse noises, the parameters including a period, an offset and duration of the noise.
Proceedings ArticleDOI
ADSL per-tone/per-group optimal equalizer and windowing design
TL;DR: An overview of existing and new techniques to maximize the achievable bit rate of discrete multi tone (DMT) based modems and methods focused on equalization and/or mitigation of narrowband interference using receiver windowing.
Dissertation
Maximizing data rate of discrete multitone systems using time domain equalization design
Patent
Time domain equalizer and method
TL;DR: In this paper, a tone error minimization from a starting point of a single-tone equalizer is used to determine the time domain equalizer for discrete multitone systems by minimizing the tone error.
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Apparatus and method for synchronizing sampling frequency and carrier frequency in a multi-carrier communication system
Fong-Ching Huang,Der-Zheng Liu +1 more
TL;DR: In this article, an apparatus and method for synchronizing sampling frequencies of a receiver and a transmitter of a multi-carrier communication system is provided, where the receiver includes an estimator for estimating a frequency offset by employing an additional angle rotation of a received signal in frequency domain.
References
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J.S. Chow,John M. Cioffi +1 more
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