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Adaptively Grouped multilevel Space-Time Trellis Codes Combined with Beamforming and Component Code Selection

WIRELESS PERSONAL COMMUNICATIONS 2014年第4期77卷 2549-2563页

作者： Jain, Dharmvir Sharma, Sanjay Thapar Univ Dept Elect & Commun Engn Patiala Punjab India

The performance of adaptively grouped multilevel space-time trellis codes (AGMLSTTCs) is limited due to predefined component space-time trellis codes (STTCs) used in multilevel coding and lack of beamforming. In this paper, we present improvement in performance of AGMLSTTCs by combining beamforming and dynamic selection of component STTCs with AGMLSTTCs to design new codes henceforth referred to as weighted adaptively grouped multilevel dynamic space-time trellis codes. The channel state information at transmitter (CSI) is used to select a code set having different sets of generator sequences. The selected code set is used for generating dynamic STTCs (DSTTCs). The DSTTCs are used as component codes in multilevel coding. We use a single full-diversity DSTTC at some initial levels and multiple DSTTCs at some later levels. The single full diversity DSTTC at each initial level spans all transmit antennas and the DSTTC at each later level spans a group of transmit antennas. The CSI is further used to provide a beam forming scheme by properly weighting transmitted signals. Weights are selected that based on CSI at transmitter. The simulation results show that AGMLSTTCs combined with beamforming and DSTTCs provide significant improved error performance over grouped multilevel space-time trellis codes and AGMLSTTCs.

关键词： multilevel coding Dynamic space-time trellis code Rayleigh fading Adaptive antenna grouping Beamforming

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Extended space-time multilevel coded spatial modulation

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JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS 2013年第6期36卷 715-720页

作者： Ma, Shang-Chih Natl Taipei Univ Technol Dept Elect Engn Taipei 106 Taiwan

A new space-time coding scheme is drawn based upon the concepts of multilevel coding, space-time block coding (STBC), and spatial modulation (SM). In light of a STBC-SM scheme, an interblock-correlated multilevel code is combined in conjunction with set partitioning of the expanded transmission matrix set according to the coding gain distance criterion. The error performance of an example code is compared with the traditional STBC-SM scheme in computer simulation. Under the situation of the same spectral efficiency and space diversity order, the proposed scheme is superior as regards its bit error performance.

关键词： multilevel coding space-time codes spatial modulation

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multilevel ERROR-CONTROL CODES FOR DATA-STORAGE CHANNELS

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IEEE TRANSACTIONS ON INFORMATION THEORY 1991年第3期37卷 735-741页

作者： ABDELGHAFFAR, KAS HASSNER, M IBM CORP DIV RESALMADEN RES CTR650 HARRY RDSAN JOSECA 95120

In data storage devices, several types of errors may occur. This includes random errors as well as burst errors of different lengths. A class of error-control codes is presented, based on a multilevel coding architecture, that can correct several types of errors. The parameters of the multilevel codes can be adjusted to match the probability of each error type. The decoding algorithms of these codes allow for fast-error recovery since they are based on decoding algorithms of simpler codes. A class of multilevel codes is constructed, based on Reed-Solomon codes, whose redundancy is minimal.

关键词： ARCHITECTURE Data storage devices redundancy Reed-Solomon codes Building construction magnetic storage systems multilevel coding DEcoding Random error Codes

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Signal Shaping for Bit-Interleaved Coded Modulation on the AWGN Channel

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IEEE TRANSACTIONS ON COMMUNICATIONS 2010年第12期58卷 3428-3435页

作者： Cronie, Harm S. Ecole Polytech Fed Lausanne CH-1015 Lausanne Switzerland

In this paper a coded modulation method for the additive white Gaussian noise channel is presented which incorporates signal shaping. The scheme uses a modulation map to map bits to channel inputs. A modulation map is considered that has the advantage it is can easily be combined with binary error-correcting codes. The decoding strategy is a combination of bit-interleaved coded modulation and multistage decoding. The number of required decoding stages is only small compared to other multistage decoding schemes for coded modulation. It is shown that modulation maps can be designed with a constrained capacity limit very close to the capacity of the AWGN channel. When combined with low-density parity-check codes, simulation results show that a near-capacity performance is achieved for high spectral efficiencies.

关键词： Gaussian channels signal shaping modulation error detection coding bit-interleaved coded-modulation multilevel coding

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Determining and approaching achievable rates of binary intersymbol interference channels using multistage decoding

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IEEE TRANSACTIONS ON INFORMATION THEORY 2007年第4期53卷 1416-1429页

作者： Soriaga, Joseph B. Pfister, Henry D. Siegel, Paul H. Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA Texas A&M Univ Dept Elect & Comp Engn College Stn TX 77843 USA

By examining the achievable rates of a multistage decoding system on stationary ergodic channels, we derive lower bounds on the mutual information rate corresponding to independent and uniformly distributed (i.u.d.) inputs, also referred to as the i.u.d. information rate. For binary intersymbol interference (ISI) channels, we show that these bounds become tight as the number of decoding stages increases. Our analysis, which focuses on the marginal conditional output densities at each stage of decoding, provides an information rate corresponding to each stage. These rates underlie the design of multilevel coding schemes , based upon low-density parity-check (LDPC) codes and message passing, that in combination with multistage decoding approach the i.u.d. information rate for binary ISI channels. We give example constructions for channel models that have been commonly used in magnetic recording. These examples demonstrate that the technique is very effective even for a small number of decoding stages.

关键词： Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm coset codes density evolution finite-state channels information rates intersymbol interference (ISI) channels low-density parity-check (LDPC) codes magnetic recording multilevel coding multistage decoding

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On the spectrum sf distances of a multilevel code, decoded by a multistage decoder

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IEEE TRANSACTIONS ON INFORMATION THEORY 1997年第5期43卷 1736-1740页

作者： Herzberg, H Laboratory of Chromatography DEPg.Fac.Quimica Universidad Nacional Autonoma de Mexico Circuito interior Cd Universitaria/CP 04510 Mexico D.F.Mexico

In this correspondence we are concerned with the error rates contributed by component codes in a multilevel code, decoded by a multistage decoder. These error rates are required for estimating the performance of the structure, but more importantly, they can serve as a design tool for achieving high coding gain. The latter objective can be reached by approaching a balance among these error rates, For evaluating the error rate contributed by a component code, it is essential to calculate the corresponding spectrum of Euclidean distances. A method for computing this spectrum is developed in this correspondence. The method is general and applicable to any signal constellation, and convolutional as well as block component codes. The error coefficient, available in the literature for some multilevel codes with an infinite size signal constellation, is shown to be significantly different from that of a practical finite constellation. Note that the complete spectrum is essential when codewords (of a component code) with Hamming distance beyond the minimum distance affect the error rate (see, e.g,, Turbo codes).

关键词： multilevel coding multistage decoding spectrum of Euclidean distances

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High-efficiency reconciliation for continuous variable quantum key distribution

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JAPANESE JOURNAL OF APPLIED PHYSICS 2017年第4期56卷 044401页

作者： Bai, Zengliang Yang, Shenshen Li, Yongmin Shanxi Univ Inst Optoelect State Key Lab Quantum Opt & Quantum Opt Devices Taiyuan 030006 Peoples R China Shanxi Univ Collaborat Innovat Ctr Extreme Opt Taiyuan 030006 Peoples R China

Quantum key distribution (QKD) is the most mature application of quantum information technology. Information reconciliation is a crucial step in QKD and significantly affects the final secret key rates shared between two legitimate parties. We analyze and compare various construction methods of low-density parity-check (LDPC) codes and design high-performance irregular LDPC codes with a block length of 10(6). Starting from these good codes and exploiting the slice reconciliation technique based on multilevel coding and multistage decoding, we realize high-efficiency Gaussian key reconciliation with efficiency higher than 95% for signal-to-noise ratios above 1. Our demonstrated method can be readily applied in continuous variable QKD. (C) 2017 The Japan Society of Applied Physics

关键词： Quantum cryptography Construction methods signal to noise ratios Quantum key distribution multilevel coding Variable low density parity check codes

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Conditional Entropy-Based Construction of multilevel Polar-Coded Modulation With Probabilistic Shaping

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IEEE COMMUNICATIONS LETTERS 2023年第5期27卷 1262-1266页

作者： Wu, Bolin Niu, Kai Dai, Jincheng Beijing Univ Posts & Telecommun Key Lab Universal Wireless Commun Minist Educ Beijing 100876 Peoples R China

Code construction is a critical issue for polar-coded systems to ensure competitive performance. In this letter, we propose a conditional entropy-based method to construct multilevel polar-coded modulation (MLC-PCM) with probabilistic shaping. More specifically, we allocate the bit positions in accordance with their conditional entropies induced by channel and source polarization. We show that a surrogate channel can be used to determine the frozen set in each component polar code efficiently. The remaining positions are assigned to the information and shaping bits by the source Bhattacharyya parameter, where the shaping bits are used to achieve non-uniform channel inputs. Approximate bounds are also derived to evaluate the decoding error probability of the probabilistically shaped MLC-PCM.

关键词： Codes Probabilistic logic Modulation Decoding Symbols Entropy AWGN channels Polar codes coded modulation multilevel coding probabilistic shaping code construction

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multilevel Concatenated Space-Time Block Codes

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2010年第10期E93A卷 1845-1847页

作者： Ma, Shang-Chih Natl Taipei Univ Technol Dept Elect Engn Taipei Taiwan

An alternative design for constructing multilevel space-time codes is proposed. For a given space-time block code, we combine several component codes in conjunction with set partitioning of the expanded signal constellation according to the coding gain distance criterion. The error performance of an example code is compared with a traditional multilevel space-time code in computer simulation.

关键词： multilevel coding set partitioning space-time block codes

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Noncoherent Block-Coded TAPSK

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IEEE TRANSACTIONS ON COMMUNICATIONS 2009年第11期57卷 3195-3198页

作者： Wei, Ruey-Yi Gu, Shi-Shan Sue, Tzu-Ching Natl Cent Univ Dept Commun Engn Jhongli Taiwan

In this letter, we propose three noncoherent block-coded twisted amplitude and phase shift keying (NBC-TAPSK) schemes which are derived from noncoherent block-coded MPSK. We also propose a new noncoherent detector and a corresponding noncoherent distance for nonconstant-energy signals over the additive white Gaussian noise (AWGN) channel. At high data rates, NBC-8TAPSK has the best bit error performance among all noncoherent schemes.

关键词： Noncoherent detection block-coded modulation multilevel coding

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