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Chaos-Based Turbo Systems in Fading Channels

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS 2014年第2期61卷 530-541页

作者： Escribano, Francisco J. Wagemakers, Alexandre Sanjuan, Miguel A. F. Univ Alcala de Henares Dept Signal Theory & Commun Escuela Politecn Super Alcala De Henares 28805 Spain Univ Rey Juan Carlos Dept Phys Mostoles 28933 Spain

The growing demand for ubiquitous wireless communication services requires powerful coding and modulation schemes to counteract the signal degradation in the air interface, preferably without resorting to costly hardware. Previous work has demonstrated that chaos-based coded modulations could be robust in the flat fading channel. This paper illustrates that, as the flat fading channel quality degrades, parallel concatenated chaos-based coded modulations can provide better error performance than non-chaotic counterparts. Therefore, this joint coding and modulation approach may contribute to power saving in common adverse channel conditions. Moreover, it is shown that it is possible to manage its spectral efficiency while keeping its robustness under fading.

关键词： Chaos concatenated coding error analysis iterative decoding

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Twin-stack decoding of recursive systematic convolutional codes

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IEEE TRANSACTIONS ON COMMUNICATIONS 2001年第7期49卷 1158-1167页

作者： Sivasankaran, R McLaughlin, SW Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

In this paper, we present a method for soft-in/soft-out sequential decoding of recursive systematic convolutional codes, The proposed decoder, the twin stack decoder, is an extension of the well-known ZJ stack decoder, and it uses two stacks. The use of the two stacks lends itself to the generation of soft outputs, and the decoder is easily incorporated into the iterative "turbo" configuration. Under thresholded decoding, it is observed that the decoder is capable of achieving near-maximum a posteriori bit-error rate performance at moderate to high signal-to-noise ratios (SNRs), Also, in the iterative (turbo) configuration, at moderate SNRs (above 2.0 dB), the performance of the proposed decoder is within 1.5 dB of the BCJR algorithm for a 16-state, R = 1/3, recursive code, but this difference narrows progressively at higher SNRs, The complexity of the decoder asymptotically decreases (with SNR) as 1/(number of states), providing a good tradeoff between computational burden and performance. The proposed decoder is also within 1.0 dB of other well-known suboptimal soft-out decoding techniques.

关键词： concatenated coding sequential decoding soft-output decoding

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concatenated Coded Modulation for Optical Communications Systems

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IEEE PHOTONICS TECHNOLOGY LETTERS 2010年第16期22卷 1244-1246页

作者： Magarini, Maurizio Essiambre, Rene-Jean Basch, Bert E. Ashikhmin, Alexei Kramer, Gerhard van Wijngaarden, Adriaan J. de Lind Politecn Milan Dipartimento Elettron & Informaz I-20133 Milan Italy Alcatel Lucent Bell Labs Holmdel NJ 07733 USA Verizon Verizon Network & Technol Verizon Labs Waltham MA 02451 USA Alcatel Lucent Bell Labs Murray Hill NJ 07974 USA Bell Labs Alcatel Lucent Murray Hill NJ 07974 USA

The use of trellis-coded modulation (TCM) in combination with an outer block code is considered for next-generation 100-Gb/s optical transmission systems. Two block codes are employed as an outer code: a 16 times interleaved byte-oriented (255,239) Reed Solomon (RS) code and a code consisting of two interleaved extended three-error correcting Bose Chaudhuri Hocquenghem (BCH) (1020,988) codes. Simulations show that soft-decision decoding of a selected TCM inner code in combination with hard-decision decoding of the outer RS code achieves a net coding gain (NCG) of 8.42 dB at a bit-error rate of 10(-13). When the concatenated code based on the two interleaved BCH codes is used as the outer code, the NCG is 9.7 dB. The impact of quantization on the performance of the concatenated TCM scheme with the two interleaved BCH outer codes is evaluated, and it is shown that 4-bit quantization is sufficient to approach the "infinite precision" performance to within 0.15 dB.

关键词： concatenated coding forward-error correction (FEC) optical communications quantization trellis-coded modulation (TCM)

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A search for good convolutional codes to be used in the construction of turbo codes

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IEEE TRANSACTIONS ON COMMUNICATIONS 1998年第9期46卷 1101-1105页

作者： Benedetto, S Garello, R Montorsi, G Politecn Torino Dipartimento Elettron I-10129 Turin Italy

Recursive systematic convolutional encoders have been shown to play a crucial role in the design of turbo codes, We recall some properties of binary convolutional encoders and apply them to a search for good constituent convolutional codes of turbo codes. Tables of the ''best" recursive systematic convolutional encoders found are presented for various rates, together with the average bit-error probability performances of some turbo codes using them.

关键词： concatenated coding convolutional codes encoders turbo codes

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Turbo-Like Structures for Chaos Encoding and Decoding

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IEEE TRANSACTIONS ON COMMUNICATIONS 2009年第3期57卷 597-601页

作者： Escribano, Francisco J. Kozic, Slobodan Lopez, Luis Sanjuan, Miguel A. F. Hasler, Martin Univ Alcala de Henares Dept Signal Theory & Commun Alcala De Henares 28805 Spain Ecole Polytech Fed Lausanne Sch Comp & Commun Sci I&C CH-1015 Lausanne Switzerland Univ Rey Juan Carlos Dept Sistemas Telemat & Computac Mostoles 28933 Spain Univ Rey Juan Carlos Dept Fis Mostoles 28933 Spain

In this paper, we explain how to build a turbo-like structure with binary inputs and chaotic outputs for efficient coding and decoding in additive white Gaussian noise (AWGN). We analyze the convergence of the decoding algorithm, the performance in the error floor region and explain minimum distance properties of the resulting codes.

关键词： Channel coding chaos concatenated coding modulation coding error analysis

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Space-frequency-time turbo coded modulation

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IEEE COMMUNICATIONS LETTERS 2001年第12期5卷 480-482页

作者： Tujkovic, D Juntti, M Latva-aho, M Univ Oulu Ctr Wireless Commun Oulu Finland

A new bandwidth and power efficient signaling scheme is proposed that achieves high data rates over wideband radio channels exploiting the bandwidth efficient OFDM modulation, multiple transmit and receive antennas and large frequency selectivity offered in typical low mobility indoor environments. Owing to its maximum transmit diversity gain and large coding gain, space-frequency-time turbo coded modulation strongly outperforms other space-frequency-time coding schemes recently proposed in literature. A simple way of combining space-frequency-time coding with OFDM delay diversity for cost effective exploitation of more than two transmit antennas is also proposed in this paper.

关键词： concatenated coding diversity methods trellis-coded modulation

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Channel Modeling and Signal Processing for Probe Storage Channels

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2010年第2期28卷 143-157页

作者： Pozidis, Haralampos Cherubini, Giovanni Pantazi, Angeliki Sebastian, Abu Eleftheriou, Evangelos IBM Res Zurich Storage Technol Dept CH-8803 Ruschlikon Switzerland

Probe-storage devices employ large arrays of probes to write/read data in parallel in some storage medium, and combine ultra-high density, low access times, and low power consumption. A particular probe-storage technique utilizes thermomechanical means to store and retrieve information in thin polymer films. In this paper, a system-level channel model for the thermomechanical probe-storage channel is presented. Each of the components of the proposed model is derived by extensive characterization of experimentally obtained readback signals from probe recording tests. Moreover, detection techniques that are actually utilized in a probe-storage prototype implementation are described, followed by coding techniques for added reliability in the presence of particles or other impurities of the storage medium. In addition to low-complexity coding constructs, a concatenated coding scheme with an outer LDPC and inner modulation code is considered, in order to establish a benchmark for overall system performance. A novel methodology for joint decoding of outer LDPC and inner (d,k) modulation codes is developed. Furthermore, an optimal soft decoder for the modulation code is proposed, based on a modification of the decoder metrics to accurately account for the probe storage channel output statistics. Experimental results are used throughout the paper to validate the channel model and identify its relevant parameters, as well as to verify the system performance obtained by simulations.

关键词： Channel modeling probe storage intersymbol interference jitter electronics noise medium noise noise shaping run-length-limited (RLL) codes low-density parity-check (LDPC) codes concatenated coding soft-decision decoding forward-backward algorithm

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Iterative demodulation and decoding of frequency-hopped PSK in partial-band jamming

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2005年第5期23卷 1026-1033页

作者： Phoel, WG MIT Lincoln Lab Lexington MA 02420 USA

This paper considers the problem of developing and utilizing side information in a frequency-hopped communication system using phase-shift keying (PSK) and operating in an environment with partial-band jamming. Two aspects of side information are studied. The first deals with estimating the unknown random carrier phase that varies from hop to hop. The second aspect is the detection of jamming signals. We use a serially concatenated convolutional code structure with differential M-ary PSK as the inner code. The iterative receiver uses an expanded trellis in the inner decoder to resolve the phase ambiguity and is augmented by a ratio-threshold test for detecting jammer energy. Performance is compared for different dwell interval lengths and both log-APP and max-log-APP decoding algorithms. This paper also considers the effect of different thresholds on the false alarm and detection probabilities of the ratio-threshold test.

关键词： concatenated coding frequency-hop communications iterative decoding partial-band interference phase-shift keying

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Communicating Over Filter-and-Forward Relay Networks With Channel Output Feedback

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2016年第5期64卷 1117-1131页

作者： Agrawal, Mayur Love, David J. Balakrishnan, Venkataramanan WorldQuant Res India Private Ltd Mumbai 400076 MH India Purdue Univ Sch Elect & Comp Engn W Lafayette IN 47907 USA

Relay networks aid in increasing the rate of communication from source to destination. However, the capacity of even a three-terminal relay channel is an open problem. In this paper, we propose a new lower bound for the capacity of the three-terminal relay channel with destination-to-source feedback in the presence of noise with memory. Our lower bound improves on the existing bounds in the literature. We then extend our lower bound to general relay network configurations using an arbitrary number of filter-and-forward relay nodes. Such network configurations are common in many multihop communication systems where the intermediate nodes can only perform minimal processing due to limited computational power. Simulation results show that significant improvements in the achievable rate can be obtained through our approach. We next derive a coding strategy (optimized using post processed signal-to-noise ratio as a criterion) for the three-terminal relay channel with noisy channel output feedback for two transmissions. This coding scheme can be used in conjunction with open-loop codes for applications like automatic repeat request (ARQ) or hybrid-ARQ.

关键词： Channel output feedback concatenated coding correlated noise linear coding relay networks relays

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concatenated trellis coded modulation for quasi-static fading channels

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2007年第9期6卷 3220-3228页

作者： Nagaraj, Santosh Bell, Mark R. San Diego State Univ Dept Elect & Comp Engn San Diego CA 92182 USA Purdue Univ Dept Elect & Comp Engn W Lafayette IN 47907 USA

In this paper, we present a novel concatenated trellis coded modulation (CTCM) scheme for limited diversity order fading channels. Examples for such channels include those encountered in indoor wireless networks like IEEE 802.11. It is first shown that when the diversity order afforded by the channel is fixed, bit interleaved coded modulation (BICM) is no longer the best way to encode. We then develop CTCM, which is superior to both BICM and conventional TCM of similar complexities. Unlike conventional TCM where convolutional codes are designed over modulated signal sets, CTCM has TCM concatenated to short length inner codes. Each trellis branch in the TCM now corresponds to a short block-code. We discuss design of good inner codes that allow for simple decoders. CTCM design incorporates useful features of both BICM and conventional TCM. Code design is explained with examples. Simulation results and information theoretic supporting the arguments are shown.

关键词： concatenated coding frequency division multiplexing trellis coded modulation

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