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Multimedia Relay Resource Allocation for Energy Efficient Wireless Networks: High-Layer Content Prioritization With Low-Layer Diversity Cooperation

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2017年第11期66卷 10394-10405页

作者： Wang, Qin Wang, Wei Sohraby, Kazem San Diego State Univ Dept Comp Sci San Diego CA 92182 USA New York Inst Technol Sch Engn & Comp Sci New York NY 10023 USA

With the popularity of versatile mobile multimedia applications and the pressing need to reduce energy consumption in future wireless networks, new challenges have been posed to maintain adequate coverage, quality of service, and reliability for big-scale multimedia traffic. Specifically, in this paper we introduce a cooperative multimedia relay framework and investigate premium-regular-diversity-based multimedia resource allocation treatment approaches. We also comparatively study five generic wireless multimedia relay scenarios including direct transmission, single relay, multiple pure relays, relay cooperation with space-time coding, and relay coordination with distributed beamforming. The key contribution of the new relay resource allocation framework is that packet importance priority diversity at the application layer is jointly considered with spatial diversity and relay coordination protocols at lower layers. Premium packets and regular packets of multimedia streams are adaptively allocated to relay nodes, and transmission resources are optimally allocated with regards to energy budget. Extensive simulation results demonstrate that the proposed resource allocation paradigm using multirelay coordination has significant video quality enhancement and energy saving potentials to support future big-data wireless multimedia traffic.

关键词： Distributed beamforming multimedia transmission relay cooperative MIMO space-time coding

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Distance spectrum analysis of space-time trellis-coded modulations in quasi-static Rayleigh-Fading channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2003年第12期49卷 3335-3344页

作者： Aktas, D Fitz, MP Univ Melbourne Dept Elect & Elect Engn Melbourne Vic 3010 Australia Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

In this correspondence, we propose an algorithm for computing the distance spectrum of a space-time trellis code achieving maximal diversity gain in quasi-static fading channels. We further present a state reduction technique for trellis codes that can reduce the complexity of the distance spectrum computation. We provide numerical results supporting the empirical evidence that a truncated union bound obtained from the distance spectrum provides an accurate characterization of the relative performance ordering of different space-time trellis codes and, therefore, it offers a tool for better space-time trellis code design.

关键词： distance spectrum performance analysis space-time coding state reduction union bound

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Low complexity receiver structures for space-time coded multiple-access systems

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EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING 2002年第3期2002卷 275-288页

作者： Jayaweera, SK Poor, HV Princeton Univ Dept Elect Engn Princeton NJ 08544 USA

Multiuser detection for space-time coded synchronous multiple-access systems in the presence of independent Rayleigh fading is considered. Under the assumption of quasi-static fading, it is shown that optimal (full diversity-achieving) space-time codes designed for single-user channels, can still provide full diversity in the multiuser channel. The joint optimal maximum likelihood multiuser detector, which can be implemented with a Viterbi-type algorithm, is derived for Such space-time coded systems. Low complexity, partitioned detector structures that separate the multiuser detection and space-time decoding into two stages are also developed. Both linear and nonlinear multiuser detection schemes are considered for the first stage of these partitioned space-time multiuser receivers. Simulation results show that these latter methods achieve performance competitive with the single-user bound for space-time coded systems.

关键词： multiuser detection space-time coding iterative detection

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Differential space-code modulation for interference suppression

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2001年第8期49卷 1786-1795页

作者： Liu, JH Li, J Li, HB Larsson, EG Univ Florida Dept Elect & Comp Engn Gainesville FL 32611 USA Stevens Inst Technol Dept Elect & Comp Engn Hoboken NJ 07030 USA

space-time coding has been receiving much attention recently due to its potentials offered by fully exploiting the spatial and temporal diversities of multiple transmit and receive antennas, A differential space-time modulation (DSTM) scheme was recently proposed for demodulation without channel state information, which is attractive in fast fading channels where accurate channel estimates are difficult to obtain. However, this technique is sensitive to interference and is likely to deteriorate or even break down in a wireless environment, where interference (including intentional and unintentional jamming) signals exist. We propose a new coding and modulation scheme, referred to as the differential space-code modulation (DSCM), which is interference resistant, Our focus is on single-user communications, We show that DSCM outperforms DSTM significantly when interference is present. This advantage is achieved at the cost of a lower data rate or a wider bandwidth or a combination of both. To alleviate this problem, a high-rate DSCM (HR-DSCM) scheme is also presented, which increases the data rate considerably at the cost of a slightly higher bit-error rate (BER), while still maintaining the interference suppression capability.

关键词： interference suppression smart antennas space-time coding spread spectrum wireless communications

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Multistratum-permutation codes for MIMO communication

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2003年第5期21卷 774-782页

作者： Stege, M Fettweis, G Tech Univ Dresden Vodafone Chair Mobile Commun Syst D-01062 Dresden Germany

Multiple-input-multiple-output. (MIMO) systems offer much capacity gain over single antenna approaches. The recently proposed multistratum space-time code (MSSTC) is such a MIMO-scheme among many others. In this paper, a generalization of the multistratum idea is presented and leads to the new family of multistratum-permutation codes. It is shown, that this scheme can achieve a higher link capacity than the MSSTC or Vertical-Bell Labs Layered space-time (V-BLAST). Scheme examples are presented for a 4 x 4 antenna system transmitting four data streams in parallel. They also show a promising performance for successive interference cancellation (SIC) receiver algorithms with a realistic complexity.

关键词： Bell Labs Layered space-time (BLAST) capacity eigenstructure multiple-input multiple-output (MIMO) systems multistratum code smart antennas space-time coding

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Closed-Form Channel Estimation for MIMO space-time Coded Systems Using a Fourth-Order Tensor-Based Receiver

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CIRCUITS SYSTEMS AND SIGNAL PROCESSING 2018年第3期37卷 1343-1357页

作者： de Araujo, Gilderlan T. de Almeida, Andre L. F. Univ Fed Ceara GTEL Wireless Telecom Res Grp Campus Pici S-NB 722 BR-60455760 Fortaleza Ceara Brazil

In this short paper, a new tensor-based receiver based on the fourth-order PARATUCK2 model combined with a structured PARAFAC model is formulated to solve the problem of channel estimation in a MIMO system. The proposed receiver is based on a modified space-time coding scheme that incorporates a formatting filter. Such a formatting filter is formed by a precoding matrix and a mapping matrix that load the coded signals to transmit antennas. The proposed receiver is divided into two steps. In the first step, closed-form channel estimation is performed by means of Kronecker and Khatri-Rao factorizations that rely on the singular value decomposition and the eigenvalue decomposition, respectively. In the second step, the transmitted symbols are linearly decoded from the estimated channel by exploiting the proposed space-time coding structure. Simulation results are presented to evaluate the performance of our tensor-based receiver in terms of NMSE and BER, demonstrating an improved performance compared to competing schemes.

关键词： space-time coding PARAFAC PARATUCK Channel estimation MIMO systems

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A Systematic Study of coding Performance in a MIMO-STBC-OFDM Link

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IETE JOURNAL OF RESEARCH 2015年第1期61卷 56-64页

作者： Chandrasekaran, Parvathi Balasubramanyam, Ramesh Raman Res Inst Astron & Astrophys Grp Bangalore 560080 Karnataka India

MIMO-STBC-OFDM systems mitigate inter symbol interference and frequency-selective fading caused by multi-path propagation in modern high-data-rate wireless communication. Error correction codes use redundancy to correct errors that still occur. No systematic analysis of their performance using a common link configuration is found in the literature. We fill this gap in this simulation study using a common MIMO-STBC-OFDM communication link, transferring data at a symbol rate of 100 Mbps. We find that (a) for all code rates, low-density parity-check code performs best with BPSK and to an extent with QPSK and (b) 1/2-rate convolutional code works well for all symbol mapping schemes.

关键词： Channel coding MIMO systems OFDM space-time coding

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Complex field coded MIMO systems: performance, rate, and trade-offs

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2002年第7期2卷 693-717页

作者： Ma, XL Giannakis, GB Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

The quest for reliable high-rate wireless links motivates fading-resilient and bandwidth-efficient communication systems capable of capitalizing on available forms of diversity. This tutorial focuses on linear complex field (LCF) coding-a powerful tool that complements the traditional Galois field (GF) coding, in enabling diversity transmissions over single- and multi-antenna fading channels. Performance and capacity analyses are provided, along with systematic guidelines for constructing LCF encoders, and options available to the designer for selecting LCF decoders. Emphasis is placed on high-performance and high-rate designs, and the emerging performance-rate-complexity trade-offs. Copyright (C) 2002 John Wiley Sons, Ltd.

关键词： complex field coding space-time coding diversity capacity complexity

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Adaptive transmit antenna selection with pragmatic space-time trellis codes

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2006年第7期5卷 1706-1715页

作者： Yuan, Jinhong Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

We consider the problem of selecting a subset of transmit antennas in MIMO systems to minimize error probability when only partial channel information is available at the transmitter. An upper bound for error probability of space-time coded transmit antenna selection scheme conditioned on the channel state information is presented. Based on the performance analysis, a criterion of selecting a subset of available transmit antennas to minimize the upper bound on the PEP is proposed. In contrast to other transmit antenna selection schemes for uncoded transmission or with a fixed number of antennas within the selection subset in the literature, the proposed scheme can adaptively select both a variable number of transmit antennas and their corresponding space-time codes for transmission. Furthermore, we present pragmatic space-time trellis coding schemes for slow Rayleigh fading channels. The principal advantage of the schemes is that a single encoder and decoder can be used for systems with a variable number of transmit antennas. The performance of the pragmatic space-time codes with adaptive antenna selection and the effect of the imperfect channel estimation on performance are evaluated by simulations. It is shown that the adaptive selection offers considerable antenna selection gain relative to the antenna selection system with a fixed number of antennas within the selection subset.

关键词： space-time coding trellis codes diversity fading channels mobile communications

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Joint prefiltering and MLSE equalization of space-time-coded transmissions over frequency-selective channels

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2002年第1期51卷 144-154页

作者： Younis, W Al-Dhahir, N Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA AT&T Labs Res Shannon Lab Florham Pk NJ 07932 USA

The problem of designing a front-end prefilter to improve the performance and/or reduce the complexity of maximum likelihood sequence estimation equalization of space-time-coded signals is addressed in this paper. The front-end prefilter performs channel shortening without excessive noise enhancement and is constrained to be a finite impulse response filter for practical implementation. Transmission scenarios emphasized assume two transmit antennas (with delay diversity or space-time trellis coding) and either one or two receive antennas. Extensions to more antennas are straightforward. Various design parameters (such as number of prefilter taps, number of equalizer states, and decision delay) are optimized using Monte Carlo simulations in a typical urban EDGE environment.

关键词： equalization intersymbol interference prefilter space-time coding

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