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IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY 2021年 2卷 1123-1143页

作者： Cribbs, Michael R. Romero, Ric A. Ha, Tri T. Naval Postgrad Sch Dept Elect & Comp Engn Monterey CA 93943 USA

In this article, several extensions to an alternating space-time (ST) code (STC) physical layer security (PLS) scheme from the literature are proposed. These contributions include alternative orthogonal STCs as well as non-orthogonal and spatially-multiplexed (SM) STCs for improved bandwidth efficiency. Phase rotation (PR) algorithms are provided to build very large sets of unique alternative STCs for use with this scheme. Decoding methods are discussed for alternating non-orthogonal and SM STCs. Monte Carlo simulations are provided to compare bit error rate (BER) performance between different decoding methods. Secrecy system nomenclature is adapted to the alternative STCs and proposed algorithms. Information-theoretic security analysis including message and key equivocation is provided along with expected eavesdropper BER based on an assumed attack methodology. A comparison of security offered by the alternating STC PLS scheme with and without incorporation of proposed PR algorithms is performed. Substantially greater exhaustive key search attack complexity is achieved by using the PR algorithms proposed in this article.

关键词： Buildings Security Three-dimensional displays Bit error rate Signal processing algorithms Physical layer security Decoding Key equivocation key residue class message equivocation phase rotation physical layer security space-time coding

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A Novel space-time coding Alamouti Waveform Scheme for MIMO-SAR Implementation

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IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 2015年第2期12卷 229-233页

作者： He, Feng Dong, Zhen Liang, Diannong Natl Univ Def Technol Coll Elect Sci & Engn Changsha 410073 Hunan Peoples R China

This letter presents a novel extended space-time coding waveform scheme for multiple-input-multiple-output synthetic aperture radar implementation. The extensions include the fulfilling of the two Alamouti periods in one transmit duration minimizing the time-variant channel effect and the new form of the basic orthogonal waveforms. The main advantages of the proposed waveform scheme include ghost image prevention, cross-channel interference mutual cancelation, simultaneous transmission via orthogonal Tx channels, free selection of PRF, etc. The proposed techniques are verified by a simulation for the case of point-like targets.

关键词： Alamouti scheme digital beamforming (DBF) multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) short-term shift-orthogonal (STSO) waveform space-time coding

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A space-time coding scheme utilizing phase shifting antennas at RF frequencies

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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2005年第1期4卷 369-372页

作者： Messier, GG Sutinjo, A Hum, SV Okoniewski, M Univ Calgary Dept Elect & Comp Engn Calgary AB T2N 1N4 Canada

We introduce a new technique for performing space-time coding by using a phase shifting antenna feed network to manipulate the transmitted signal at RF frequencies. The advantage of this scheme is that it allows space-time coding to be implemented with only one transmit chain and amplifier. A code-division multiple-access (CDMA) system that can use this method of space-time coding is described. The antenna feed network is presented along with a modified version of the Alamouti code that is suitable for this application. Imperfections in the antenna phase shifting are quantified using an error vector magnitude (EVM) measure. System level CDMA simulations are also used to evaluate the overall performance of this "RF space-time coding" technique. The results indicate a performance improvement equivalent to conventional space-time codes.

关键词： code division multiple access (CDMA) dipole antennas error vector magnitude (EVM) phase shifting antenna feed network space-time coding

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A novel complex orthogonal design for space-time coding in sensor networks

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WIRELESS PERSONAL COMMUNICATIONS 2007年第4期43卷 1755-1759页

作者： Woo, Tai-Kuo Natl Def Management Coll Dept Informat Management Taipei Taiwan

In this paper, we propose a complex orthogonal design based on the theory of Finite projective plane. As most of the orthogonal designs incur low ratio of time diversity, the proposed complex orthogonal design has a relatively high ratio of time diversity. In addition, the proposed scheme has the following characteristics: (1) full spatial diversity (2) low rate (<= 1/3) (3) linear processing. We compare the proposed scheme with another complex design to show the tradeoffs. The proposed scheme can be of use for certain applications such as sensor networks and deep space exploration where there might be an imposed limit on the peak transmit power.

关键词： space-time coding orthogonal design finite projective plane

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A New Approach to space-time coding through Gram-Schmidt Procedure

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RECENT ADVANCES IN ELECTRICAL & ELECTRONIC ENGINEERING 2018年第4期11卷 484-486页

作者： Chimeh, Jahangir Dadkhah Iran Telecommun Res Ctr Commun Technol Dept POB 143995-5471 Tehran Iran

Background: Referring to space-time coding (STC) in wireless MIMO communication and Gram-Schmidt procedure, we introduce a new procedure in the symbol combiner of the receiver that detects the transmitted symbols straightforwardly and more easily than the heuristic procedure presented by Alamouti. Methods: To find this combiner, we firstly project the vector of symbols in a two-dimensional orthonormal basis, Cartesian coordinate system, and make the computation in this coordinates. Conclusion: Using the presented procedure, we obtain new capabilities to realize both the new combiner and a reasonable BER in the receiver.

关键词： space-time coding Gram-Schmidt wireless communication QPSK scheme MIMO system model MRCC

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Continuous Phase Modulation and space-time coding: A Candidate for Wireless Robotics

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WIRELESS PERSONAL COMMUNICATIONS 2012年第3期64卷 473-487页

作者： Deneire, Luc Lebrun, Jerome Lab I3S Sophia Antipolis France Univ Nice Sophia Antipolis CNRS F-06903 Sophia Antipolis France

The physical layer(s) of wireless robotics take advantage of current standards, like Bluetooth, Wifi, etc., each of them addressing a specific segment of wireless robotics. Wireless robotics has a wide range of needs, comprising low power, robustness and high data rate when video is used as well as the opportunity to use a large number of transceivers. To cover these needs and take benefit from these opportunities, we propose a new physical layer, based on continuous phase modulation (CPM) and space-time coding. CPM, already used in some standards like GSM and Bluetooth, enables the development of low power devices, but presents a low spectral efficiency. space-time coding on the other hand yields high spectral efficiency as well as enhanced robustness against the wireless channel. Moreover, space-time coding can take benefit of the large number of transceivers using cooperative communications. In this paper, after analysing the opportunities given by wireless robotics as well as its specific needs, we propose a new physical layer based on L-2-orthogonality for non-linear space-time codes. L-2-orthogonality of our codes is ensured by a bank of phase correction functions, maintaining phase continuity, but at the same time enabling low complexity decoding. We show that the code achieves full diversity and has full rate, for any number of transmit/receive antennas and any CPM parameter.

关键词： space-time coding Continuous phase modulation Physical layer

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Wireless Robotics: Generalization of an Efficient Approach with Multi-h CPM Signaling and L2-Orthogonal space-time coding

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WIRELESS PERSONAL COMMUNICATIONS 2013年第3期70卷 1183-1198页

作者： Hisojo, Miguel Angel Lebrun, Jerome Deneire, Luc Univ Nice Sophia Antipolis CNRS F-06903 Sophia Antipolis France

Wireless Robotics has become an important research topic in the last two decades. The need of controlling a robot to perform tasks remotely has significantly increased with the number of applications in fields like medicine and military, among many others. Taking advantage of current standards like Bluetooth and Wifi, Wireless Robotics calls for low power consumption components, robustness and high data rate through the wireless channel. This call can be fulfilled with a reliable signaling format, satisfying the needs of low power consumption and high spectral efficiency. Besides, continuous phase modulation (CPM) has gained increasing attention due to its favorable trade-off between power and bandwidth efficiency. Multi-h CPM recently appeared as a generalization of single-h schemes so as to further decrease the need for bandwidth expansion over the wireless channel. Despite the interesting characteristics of CPM, the decoding of the received signal is particularly difficult in a multi-path wireless environment with no diversity. To provide some level of diversity, several authors have proposed to combine CPM with space-time block coding. A new family of codes for CPM, based on -orthogonality was recently introduced in Hesse et al. (IEEE Trans Commun 59(11): 3158-3166, 2011). These full rate codes achieve full diversity and a low decoding complexity. In this paper, we detail a non trivial extension of these -orthogonal space-time codes using multi-h signaling schemes. These new codes still achieve full diversity but a better spectral compactness by utilizing the available communication bandwidth more efficiently. Also, the decoding complexity is greatly decreased by using only one correlation filter bank for the detection of all transmitted signals.

关键词： Wireless Robotics space-time coding Continuous phase modulation L2-Orthogonal design Multi-h CPM Diversity Decoding complexity

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space-time coding for the Advanced Range Telemetry Continuous Phase Modulation

Space-Time Coding for the Advanced Range Telemetry Continuou...

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作者： Leatham, Robert L. Brigham Young University

学位级别：M.Sc.

Aeronautical telemetry systems that transmit the same signal through multiple antennas from the flight vehicle suffer from severe link dropouts when the signals destructively interfere one with another at receiver. The underlying issue is a transmit array with element spacing far greater than the wavelength producing a transmit antenna pattern with significant and deep nulls. Recently, space-time coding techniques have been proven to resolve the issue for systems using linear modulations and shaped-offset quadrature shift keying (SOQPSK) modulation, a non-linear continuous phase modulation (CPM). This thesis examines application of space-time coding techniques to resolve the self-interference issue for another CPM modulation, the advanced range telemetry (ARTM) CPM. It is shown in this thesis among the two branches of space-time coding, space-time block coding (STBC) and space-time trellis coding (STTC), only the latter offers a solution for a full rate, low complexity, no hardware modification implementation. Various candidate STTCs are identified via simulation using the pair-wise error probability as a performance metric. One STTC is identified with trivial implementation costs and an error performance that is a function of code length.

关键词： Aeronautical telemetry space-time coding ARTM CPM

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An Efficient space-time coding Scheme Using List-based Decoding

An Efficient Space-Time Coding Scheme Using List-based Decod...

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9th IEEE Malaysia International Conference on Communications

作者： Nguyen, Huan X. Glasgow Caledonian Univ Sch Engn & Comp Glasgow G4 0BA Lanark Scotland

ISBN: (纸本)9781424455324

In this paper, we first consider a layered groupwise space-time block coding (GSTBC) scheme for multiple antennas communication systems. A novel list-based decoder for the GSTBC in multiple input single output (MISO) cases is then proposed. The error floor problem associated with the single receive antenna is resolved and, as a result, a near maximum likelihood (ML) performance is obtained. Our proposed scheme can be easily applied to the case of large number of transmit antennas while keeping a reasonably low complexity at the receiver.

关键词： MIMO systems single-antenna receiver space-time coding successive interference cancellation list-based decoding

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On the Performance of Distributed space-time coding with Selection Relaying and Beamforming for Two-Path Successive Relay Network

On the Performance of Distributed Space-Time Coding with Sel...

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5th IEEE International Black Sea Conference on Communications and Networking (IEEE BlackSeaCom)

作者： Gilan, Mahsa Shirzadian Olfat, Ali Univ Tehran Sch Elect & Comp Engn Signal Proc & Commun Syst Lab Tehran Iran

ISBN: (纸本)9781509050499

Two-path successive relaying is used as a method of transmission for recovering the bandwidth loss of conventional relay networks. In this paper, a new beamforming method is employed alongside the proposed distributed space-time coding (DSTC) transmission scheme in a two-path successive relay network which enjoys SNR-based selection relaying protocol. A closed-form expression for the end-to-end bit error rate (BER) of the system is derived. Regardless of the fading in inter-relay channel, the proposed scheme ensures that full rate and full diversity can be attained in the presence of decoding errors at the relay nodes. Simulation results, show a significant power saving about 2.5 dB at BER (10(-4)) in comparison to other conventional methods.

关键词： Adaptive threshold cooperative beamforming diversity space-time coding successive relaying.

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