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Partially systematic rate-compatible punctured SCCCs

IEEE COMMUNICATIONS LETTERS 2004年第4期8卷 241-243页

作者： Babich, F Montorsi, G Vatta, F Univ Trieste DEEI I-34127 Trieste Italy Politecn Torino Dipartimento Elettr I-10129 Turin Italy

In this letter, we propose and compare some new rate-compatible serially concatenated convolutional code (SCCC) families. To obtain them, inner coded bits only are punctured. However, and this is the novelty proposed in the letter, the puncturing is not limited to inner parity bits, but extended also to inner systematic bits, thus obtaining high rate SCCCs (i.e., beyond the outer code irate). The two main applications of this technique are its use in hybrid Automatic-Repeat-reQuest/Forward-Error Correction (ARQ/FEC) schemes and to achieve unequal error protection (UEP) of an information sequence.

关键词： concatenated coding punctured codes serial concatenation

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Turbo decoding for high-rate concatenated parity-check codes on PRML channels

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IEEE TRANSACTIONS ON MAGNETICS 2000年第5期36卷 2173-2175页

作者： Sawaguchi, H Wolf, JK Hitachi Ltd Cent Res Lab Kokubunji Tokyo 1858601 Japan Univ Calif San Diego Ctr Magnet Recording Res La Jolla CA 92093 USA

A simple turbo decoding scheme is proposed for partial-response (PR) channels by using high-rate parity-check codes as an outer error-correction code (ECC), The use of the simple parity codes enables a simplified and high-speed implementation of the a posterior probability (APP) decoder. Its key feature is an iterative decoding step for the parallel concatenation of two parity-check outer codes connected via an interleaver, The parity iterative decoding can provide the high-rate parity-check outer codes with superior correction capability for random error-events, so it can help to reduce the decoding latency, The combination of the serial turbo decoding for a modified E-2 PR ((MEPR)-P-2) channel and the parity iterative decoding demonstrated a coding gain of 4-5 dB at a bit error rate of 1.0E-5 for a coding rate of 8/9.

关键词： concatenated coding turbo iterative decoding parity-check code partial response signaling

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Iterative multiuser detection/decoding for turbo coded CDMA systems

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IEEE COMMUNICATIONS LETTERS 2001年第3期5卷 104-106页

作者： Damnjanovic, AD Vojcic, BR Ericsson Wireless Commun Inc CDMA Syst San Diego CA 92121 USA George Washington Univ Dept Elect & Comp Engn Washington DC 20052 USA

In this letter, we propose a novel scheme for iterative multiuser detection and turbo decoding. The multiuser detector and single-user turbo decoders are coupled such that after each turbo decoding iteration the extrinsic information of the interfering users is passed to the multiuser detector, and after each multiuser iteration, updated a posteriori probabilities are passed to the single-user turbo decoders as the soft input metrics. In synchronous systems, the proposed detector approaches the multiuser capacity limit within 1 dB in the low signal-to-noise ratio region.

关键词： code division multiaccess concatenated coding iterative methods multiuser channels

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Turbo decoding for partial response channels with colored noise

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IEEE TRANSACTIONS ON MAGNETICS 1999年第5期35卷 2322-2324页

作者： Souvignier, T Wolf, JK Dati, A Univ Calif San Diego Ctr Magnet Recording Res La Jolla CA 92093 USA

Recent work on the application of turbo decoding techniques to partial response channels has focused on additive white Gaussian noise channel models, Simulations using these ideal partial response channel models show gains exceeding 5 dB over uncoded systems at bit error rates of 10(-5). Since the APP detectors of the turbo decoder assume uncorrelated Gaussian noise, the performance on more realistic channel models, using correlated noise, was unknown. In this work, we replace the white noise partial response channel model with the more realistic equalized Lorentzian channel model. Simulation results of the turbo decoding system with both channel models will be presented.

关键词： concatenated coding iterative methods partial response signaling

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Performance of Underground Cables That Use OFDM Systems for Broadband Power-Line Communications

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IEEE TRANSACTIONS ON POWER DELIVERY 2009年第4期24卷 1889-1897页

作者： Anatory, Justinian Theethayi, Nelson Thottappillil, Rajeev Univ Dodoma Coll Informat & Virtual Educ Sch Virtual Educ Dodoma Tanzania Uppsala Univ Div Elect SE-75121 Uppsala Sweden Royal Inst Technol Div Electromagnet Engn SE-10044 Stockholm Sweden

Power-line networks are proposed for broadband data transmission. The presence of multipaths within the broadband power-line communication (BPLC) system, due to stochastic changes in the network load impedances, branches, etc. pose a real challenge as it affects network performance. This paper attempts to investigate the performance of an orthogonal frequency-division multiplexing (OFDM)-based BPLC system that uses underground cables. It is found that when a branch is added in the link between the sending and receiving end, there is an average of 4-dB power loss. In addition, when the terminal impedances of the branches that are connected to the link between the transmitting and receiving end vary from line characteristic impedance to low-impedance values, the power loss (signal-to-noise ratio) is about 0.35 dB/Omega. On the contrary, for an increase in the terminal impedances by 100 Omega above line characteristic impedance, the power loss is 0.23 dB/Omega. When the branch terminal impedances are close to short or open circuits, OFDM techniques show degraded performance. This situation is also observed when the number of branches increases. It is shown that to overcome degraded network performance, the concatenated Reed-Solomon codes/interleaved Viterbi methods can be used, which could be used for an efficient design of the BPLC system that uses OFDM techniques.

关键词： Branched network broadband communication concatenated coding convolution codes impulse noise interleaved coding multipath channels orthogonal frequency-division multiplexing (OFDM) power-line communication Reed-Solomon codes

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Performance of timing recovery methods in turbo coded magnetic recording channels

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IEEE TRANSACTIONS ON MAGNETICS 2000年第5期36卷 2187-2189页

作者： Yuan, YF Kurtas, E Kumar, BVKV Carnegie Mellon Univ DSSC Pittsburgh PA 15213 USA Seagate Technol Pittsburgh PA 15203 USA

Turbo codes, with potential 4 to 5 dB coding gain over the conventional Viterbi detection schemes, are good candidates for the next generation detection/decoding schemes for magnetic recording systems. In this paper, timing recovery is included in the evaluation of Turbo codes. Three timing recovery methods, namely voltage control oscillator (VCO) method, interpolated timing recovery (ITR) method and adaptive filter timing recovery (AFTR) method are examined for two turbo decoder architectures, full turbo and serial turbo. Bit error rate (BER) results from simulations suggest that full turbo decoder is more robust than the serial turbo decoder. For serial turbo decoder, error floor is seen earlier in VCO and ITR methods than AFTR method. Using s-random interleaver seems to be able to remove such error floor.

关键词： adaptive filter concatenated coding partial response signaling timing recovery turbo codes

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A truncated best-path algorithm

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IEEE TRANSACTIONS ON COMMUNICATIONS 1998年第5期46卷 568-572页

作者： Kwan, D Kallel, S Narrowband Telecommun Res Inc Burnaby BC Canada Univ British Columbia Dept Elect Engn Vancouver BC V6T 1Z4 Canada

A variant of the best-path (BP) algorithm that can be used for deducing a posteriori symbol probabilities for input sequences of unlimited length is proposed. Decoders using the proposed algorithm have fixed memory requirements and fixed decoding delays regardless of the length of the transmitted sequence. This is made possible by utilizing the Viterbi algorithm's ability to self-initialize itself and by segmenting the decoding process.

关键词： concatenated coding convolutional codes MAP estimation maximum-likelihood decoding soft-output decoding trellis codes Viterbi decoding

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Performance evaluation of concatenated codes with inner trellis codes and outer Reed-Solomon code

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IEEE TRANSACTIONS ON COMMUNICATIONS 2001年第4期49卷 565-570页

作者： Valadon, CGF Tafazolli, R Evans, BG TTPCom Ltd Royston SG8 6EE Herts England Univ Surrey Ctr Commun Syst Res Guildford GU2 5XH Surrey England

This letter presents a new method for the performance evaluation of concatenated coding schemes with inner convolutional code or trellis-coded modulation and outer Reed-Solomon code.

关键词： concatenated coding convolutional codes error analysis forward error correction Markov processes Reed-Solomon codes trellis-coded modulation

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Turbo decoding for partial response channels using spinstand data

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IEEE TRANSACTIONS ON MAGNETICS 2000年第5期36卷 2167-2169页

作者： Souvignier, T Keirn, Z Xu, C Texas Instruments Inc Longmont CO 80503 USA

The partial response channel can be viewed as a rate-1 encoder in which the output alphabet differs from the input alphabet. in serially concatenated coding schemes, the partial response channel can serve as the inner encoder, Recent works on the application of turbo decoding techniques to partial response channels have used channel models to investigate system performance. While the models provided some insight into the performance of turbo decoding techniques, performance in a real system, with electronic and signal-dependent media noise, remained unknown. This paper will demonstrate the performance of turbo decoding techniques using real and modeled spinstand data. A simple serial concatenation system will be presented that uses as its outer code a single convolutional code and as its inner code the partial response channel. Significant gains will be shown over QMTR coded systems.

关键词： codes concatenated coding error correction iterative methods partial response signaling turbo codes

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Constrained Turbo Product and Block-Convolutional Codes in Wireless Applications

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2017年第5期66卷 4491-4495页

作者： Hu, Yuan Fonseka, John P. Bo, Yu Dowling, Eric M. Torlak, Murat Univ Texas Dallas Dept Elect Engn Richardson TX 75080 USA Trellis Phase Commun LP Plano TX 75670 USA

Constrained interleavers are used in constrained turbo product codes (CTPCs) and constrained turbo block-convolutional (CTBC) codes. The constrained interleaver delivers an interleaver gain close to uniform interleaving while also increasing the minimum Hamming distance. In this study, new and improved single row(SR) versions of the previous codes, called SR-CTPCs and SR-CTBC codes, are introduced that have higher interleaver gain, better performance, and much more flexible frame sizes as needed in wireless applications. Compared with the WiMax and the long-term evolution standards, it is demonstrated that SR-CTPC and SR-CTBC codes perform better than those currently used in the wireless standards.

关键词： concatenated coding modulation coding

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