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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Journal ArticleDOI
Zero-forcing frequency-domain equalization for generalized DMT transceivers with insufficient guard interval
TL;DR: It is shown that redundancy in the time domain can be traded off for redundancy inThe frequency domain resulting in a transceiver with a lower system latency time and the derived equalizer matrix is sparse, thus resulting inA low computational complexity.
Proceedings ArticleDOI
Exploiting symmetry in channel shortening equalizers
TL;DR: It is shown that finite length minimum mean squared error (MMSE) and maximum shortening SNR (MSSNR)TEQs are approximately symmetric, and infinite length MSSNR TEQs with a unit norm TEQ (UNT) constraint are exactly symmetric.
Patent
Bit-loading in multicarrier communication systems in the presence of an asymmetric, correlated Gaussian noise sources
TL;DR: In this article, a multi-tone receiver is used to measure a noise power level present in the system and to detect for an asymmetric Gaussian noise source in the background noise.
Optimal Time Domain Equalization Design for Maximizing Data Rate of Discrete Multi-Tone Systems
TL;DR: Atime domainTEQ filter bank (TEQFB) and single TEQ that demonstrate better data rates at the FEQ output than MBR, Min-ISI, and least-squares PTE methods with standard CIRs, transmit filters, and receive filters are proposed.
Proceedings ArticleDOI
Frequency domain equalization with tone grouping in DMT/ADSL-receivers
TL;DR: For a practical example, it is shown that combining tones into groups of 11 tones does not reduce the capacity significantly while this means a significant complexity saving during modem initialization.
References
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J.S. Chow,John M. Cioffi +1 more
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