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
Efficient implementation of time domain equalizer for DMT/OFDM systems
Jian Dang,Zaichen Zhang +1 more
TL;DR: This paper proposes an efficient implementation of time domain equalizer for discrete multitone and orthogonal frequency division multiplexing systems by properly using fast Fourier transform modules.
Proceedings ArticleDOI
Time domain equalization for DMT transceivers: a new result
Wen-Rong Wu,Chun-Fang Lee +1 more
TL;DR: This paper analyzes the TEQ-filtered noise in detail and derives the correct noise power calculation formulae and proposes a new TEQ design method outperforming existing ones.
Proceedings ArticleDOI
Low complexity adaptation for channel shortening equalizers
Avinash Mohan,K.V.S Hari +1 more
TL;DR: The proposed adaptation techniques are shown to perform admirably well for small changes in channels for OFDM systems, and provide excellent approximations to the new TEQ weights.
Patent
Digital receiver for a signal generated with discrete multi-tone modulation
TL;DR: In this article, a digital receiver for a signal generated with discrete multi-tone modulation, having an analog-digital converter to which the signal generated by the signal generator is fed, in addition to a time domain equalizer mounted downstream from the analog digital converter, is described.
Proceedings ArticleDOI
Joint I/Q imbalances and CFOs compensation for multiuser wireless networks in the presence of IBI
TL;DR: The proposed receiver performs first blind C-MMOE channel shortening of all the user channels, without requiring a priori knowledge of the channel impulse responses to be shortened, or compensation of the CFOs and transmitter I/Q imbalances.
References
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A discrete multitone transceiver system for HDSL applications
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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.
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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.
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Recursive ladder algorithms for ARMA modeling
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