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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Interference Cancellation for EDGE via Two-User
Abdulrauf Hafeez,Dennis Hui +1 more
TL;DR: Simulation results show that large performance gains are obtained with moderate receiver complexity in a dominant interferer-limited environ- ment, and joint demodulation for cancelling a dominant cochannel or adjacent-channel interferer is considered.
Proceedings ArticleDOI
Decision feedback sparsening filter design for belief propagation detectors
TL;DR: This work considers a generalization of channel shortening which is designed to reduce the effective channel to a small number of nonzero taps which do not need to be contiguous, and addresses the design aspects of decision feedback sparsening filters.
Distortion Compensation for Block Transmission System with Cyclic Prefix
Kazunori Hayashi,Hideaki Sakai +1 more
TL;DR: In this paper, a minimum mean-square-error (MMSE) metric is used to measure the mean square error of a MMSE metric and the MMSE scores are used.
Proceedings Article
Symbol-by-symbol adaptive null-space exploiting (SANE) channel truncation for fading OFDM channels
TL;DR: A symbol-by-symbol adaptive null-space exploiting CSP (SANE-CSP) scheme based on the NE-C SP structure, which is computationally inexpensive and has a block error rate performance 3 dB poorer than the decoding-delay optimised LMMSE, but with only 0.01% computational complexity.
Referenzdatenfreie Kanalschätzung für Multiträgerübertragung
TL;DR: In this paper, a Verfahren zur Steigerung der Konvergenzgeschwindigkeit bei einer referenzdaten-freien Kanalschatzung durch nachtragliche Filterung der Schatzwerte is presented.
References
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A discrete multitone transceiver system for HDSL applications
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Proceedings ArticleDOI
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J.S. Chow,John M. Cioffi +1 more
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Proceedings ArticleDOI
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