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
A weighted frequency-domain least squares approach for equalization in discrete multitone systems
Bo Wang,Tulay Adali +1 more
TL;DR: The definition of the frequency-domain TEQ design criterion allows for the introduction of a weighting function to control the spectral shape of the TEQ, and facilitates important extensions particularly useful for the DMT system.
Journal ArticleDOI
New Results with Blind Time Domain Equalization for OFDM System
Time-domain equalizer design for discrete mijltitone systems
TL;DR: In this article, the frequency-domain least squares cost function was extended to the time domain to minimize the least square cost function defined in the frequency domain, and a new learning algorithm was proposed to shorten the channel impulse response.
Proceedings ArticleDOI
Rake Performance after Channel Shortening by Decay Factor Optimization in UWB Channels
TL;DR: Simulation results show that the proposed algorithm improves the performance of the Rake receiver in dense multipath UWB channels and considerably reduces its structure complexity.
References
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