Combined trellis coding and DFE through Tomlinson precoding

Aman, Ahmad K.; Cupo, R.; Zervos, Nikolaos

doi:10.1109/49.93098

Cited by 30 publications

(13 citation statements)

References 13 publications

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“…Therefore, we can consider one of the components for the sake of simplicity in explanation. Denote the coded sequence by c(D) = c 0 + c 1 D −1 + · · · + c k D −k + · · · with c k ∈ {−1, +1}, the real signal of the outputs of the WMF, at time k, is expressed by [4] …”

Section: Turbo Decodingmentioning

confidence: 99%

“…For applications in which knowledge of the channel can be known by the transmitter, Tomlinson-Harashima (T-H) precoders [1]- [4] have been often used instead of decision-feedback equalizers (DFE) in the receiver in order to avoid performance degradation due to the well-known error propagation effects of the DFE. Turbo codes [5] can approach the Shannon's limit.…”

Section: Introductionmentioning

confidence: 99%

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Turbo decoding for precoded systems over multipath fading channels

Zhang

Le‐Ngoc

2004

J. Commun. Netw.

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A combined precoding and turbo decoding strategy for multi-path frequency-selective fading channels is presented. The precoder and multi-path fading channel are jointly modeled as a finite-state probabilistic channel to provide the multi-stage turbo decoder with its statistics information. Both a priori and a posteriori probabilities are used in the metric computation to improve the system performance. Structures of the combined turbo-encoder, interleaver, and precoder in the transmitter and two-stage turbo decoder in the receiver are described. Performance of the proposed scheme in fixed, Rician and Rayleigh multi-path fading channels are evaluated by simulation. The results indicate that the combined precoding and two-stage turbo decoding strategy provides a considerable performance improvement while maintaining the same inner structure of a conventional turbo decoder.

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Section: Turbo Decodingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Turbo decoding for precoded systems over multipath fading channels

Zhang

Le‐Ngoc

2004

J. Commun. Netw.

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“…The equalization in both the baseband and the QAM/CAP systems need not be carried out in the receiver but can be performed in the transmitter, the so-called precoding approach, if a feedback channel exists to relay the learned channel characteristics back from the receiver to the transmitter [9], [72], [77]. A qualitative comparison of receiver-side equalization, transmitter-side equalization (both for QAM, CAP, or PAM systems), and DMT will be given after introduction of the DMT technique in the next subsection.…”

Section: Lin Et Al: Video On Phone Lines: Technology and Applicationsmentioning

confidence: 99%

Video on phone lines: technology and applications

Lin

Chen²,

Hsing³

1995

Proc. IEEE

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“…Different alternatives have been proposed for the realization of an ADSL system. A multicarrier approach is outlined in [8], and the use of Tomlinson precoding combined with Trellis Coded Modulation is suggested in [91 and [12]. In [91 PAM and QAM modulation formats are investigated, whereas [12] focuses on Carrierless AM/PM modulation.…”

Section: Introductionmentioning

confidence: 99%

“…A multicarrier approach is outlined in [8], and the use of Tomlinson precoding combined with Trellis Coded Modulation is suggested in [91 and [12]. In [91 PAM and QAM modulation formats are investigated, whereas [12] focuses on Carrierless AM/PM modulation. Although the last two systems were proposed for HDSL services, they could be extended to realize ADSL services.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a QAM adaptive receiver for 1.6 Mbps digital subscriber line transmission

Daneshrad¹,

Samueli²

[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications

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The hymmehc Digital Subscriber L i e (ADSL) service attempts to provide 1.6 Mbps data transmission over a single twistedpair copper loop for distances up to 18 kft. In this paper we investigate the various system components necessary to realize s u d a system on a single integrated circuit (IC). Topics of discussion include: modulation format, adaptive equalization and its convergence, and system sensitivity to sampling phase enor. A comparison of conventional QAM and PAM modulation schemes is presented, followed by simulation results for a QAM based alldigital system. It is concluded that a QAM based system can meet the system objectives. The use of fractionally-spaced equalization and error prediction as means of improving SNR, and reducing the hardware complexity (fewer equalizer taps) are investigated for such a system. It is shown that with 6 T/Z-spaced feed-forward equalizer (FFE) taps, 8 decision-feedback equalizer (DIT) taps, and 2 error predictor taps. the proposed digital QAM system can achieve performance close to that of an ideal infinite length equalizer.

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Combined trellis coding and DFE through Tomlinson precoding

Cited by 30 publications

References 13 publications

Turbo decoding for precoded systems over multipath fading channels

Turbo decoding for precoded systems over multipath fading channels

Video on phone lines: technology and applications

Performance analysis of a QAM adaptive receiver for 1.6 Mbps digital subscriber line transmission

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