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IEEE Global Communications Conference

作者： Yahia A. Eldemerdash Octavia A. Dobre Mohamed Marey George K. Karagiannidis Bruce Liao Faculty of Engineering and Applied Science Memorial University of Newfoundland Faculty of Electronic Engineering Menoufyia University Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Defence Research and Development Canada

ISBN: (纸本)9781479913510

This paper proposes a novel and efficient algorithm for space-time block code (STBC) classification, when a single antenna is employed at the receiver. The algorithm exploits the discriminating features provided by the discrete Fourier transform (DFT) of the fourth-order lag products (FOLPs) of the received signal. It does not require estimation of the channel, signal-to-noise ratio (SNR), and modulation of the transmitted signal, Computer simulations are conducted to evaluate the performance of the proposed algorithm. The results show the validity of the algorithm, its robustness to carrier frequency offset, and low sensitivity to timing offset.

关键词： Signal classification space-time block code (STBC) signal classification efficient algorithm discrete Fourier transform signal to noise ratios carrier frequency offset received signal low sensitivity algorithms Codes space time block coding Taxonomy

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Opportunistic space time Code for Four-relay Network

Opportunistic Space Time Code for Four-relay Network

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European Wireless 2013;19th European Wireless Conference

作者： Ammar M. Abu-Hudrouss Alister G. Burr Electrical Engineering Department Islamic University DepartmentofElectronics University of York

This paper investigates the use of opportunistic space time codes with a decode and forward protocol in cooperative networks. CRC code is applied on the message at the source. At each relay, only the correctly received message block is retransmitted. We demonstrate that this cooperative protocol prevents propagation of error and optimizes the diversity order depending on the channel status and available transmit power.

关键词： Distributed space time codes Virtual MIMO QOSTBC STBC space time block coding channel status Transmitter power DEcoding protocols

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A Modified Successive Interference Cancellation Algorithm for Hybrid Diversity/Spatial Multiplexing MIMO Schemes

A Modified Successive Interference Cancellation Algorithm fo...

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IEEE Vehicular Technology Conference

作者： Walter C. Freitas Carlos I. R. Bandeira Francisco M. C. Caldas Wilkinson T. F. Moura GTEL - Wireless Telecommunications Research Group Federal University of Ceará CP 6005 Campus do Pici 60455-760 Fortaleza Brazil

ISBN: (纸本)9781467363365

In this paper, we propose a modified successive interference cancellation algorithm and its performance is evaluated considering hybrid diversity/spatial multiplexing multiple input multiple output (MIMO) schemes. As consequence of this modification, the diversity layer of hybrid schemes is now able to achieve the full diversity and thereby improves performance considering bit error rate, while offering greater efficiency in bits per channel use (pcu) when compared with traditional space-time block code (STBC) using the same number of transmit antennas.

关键词： MIMO STBC diversity multiple input multiple output systems space time block coding transmitting antennas Interference cancellation MULTIPLEXOR Drill bits Bit error rate numerical invariant

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A Transform-and-Forward Scheme for Relay Networks

A Transform-and-Forward Scheme for Relay Networks

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IEEE Global Communications Conference

作者： Mohammud Z. Bocus Gillian Huang Justin P. Coon Toshiba Research Europe Limited Telecommunications Research Laboratory

ISBN: (纸本)9781479913510

We present a new means of implementing distributed space-time block codes (STBC) for wireless amplify-and-forward (AF) relay networks. In the proposed method, each source antenna transmits one column of an STBC matrix derived from a generalized complex orthogonal design (GCOD). Such designs were originally intended for single hop environments. At each relay antenna, a precoding matrix and a fixed gain amplification factor are applied before the resulting signal is forwarded to the next set of nodes. The precoding operation at the relays rearranges the elements of the received vector in such a way that the equivalent STBC code observed at the destination is quasi-orthogonal. The characteristics and one structure for the precoding matrices are proposed. Initially, a dual hop system is considered for convenience. We then demonstrate how the scheme can be readily extended to multihop networks. We refer to this type of relay system as the transform-and-forward scheme. Simulation results demonstrate the performance of the technique over an existing approach.

关键词： STBC GCOD precoding matrices space time block coding Relay networks relay prediction coding Scheme Relay systems

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Feedback-based multi-layered STBC system for MIMO multi-cellular networks with cochannel interference

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2012年第6期12卷 492-502页

作者： Wang, Jui Teng Natl Chi Nan Univ Grad Inst Commun Engn Puli Nantou Taiwan

A feedback-based multi-layered STBC (MLSTBC) system, which is adapted to cochannel interference, is proposed. This system can adjust its transmitter configuration so that the largest throughput for the given SINR is obtained, also, it can use joint beamforming and power control to minimize cochannel interference so that the throughput requirement is satisfied. We propose an iterative algorithm to realize joint beamforming and power control for the feedback-based MLSTBC system, and in this algorithm, we derive the required SINR and the corresponding transmitter configuration for attaining the throughput requirement. Some properties and simulation results are presented, they show that the proposed algorithm helps the feedback-based MLSTBC system increase the probability of the success in meeting the throughput requirement, also they show that the feedback-based MLSTBC system results in larger throughput than MLSTBC (with fixed transmitter configuration), STBC, and V-BLAST. Copyright (C) 2010 John Wiley & Sons, Ltd.

关键词： multilayers Power control Cochannel interference space time block coding V-BLAST Throughput SINR

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On Combined Beamforming and OSTBC over the Cognitive Radio S-Channel with Partial CSI

On Combined Beamforming and OSTBC over the Cognitive Radio S...

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7th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM)

作者： Stathakis, Efthymios Skoglund, Mikael Rasmussen, Lars K. KTH Royal Inst Technol Sch Elect Engn Stockholm Sweden

ISBN: (纸本)9781936968558

A pair of secondary (cognitive, unlicensed) users is communicating in the presence of multiple primary (licensed) user pairs. The cognitive transceiver is implementing beamforming and orthogonal space-time block coding in the presence of external interference, induced by the primary system transmission, that has to be properly handled. Moreover, the cognitive link nodes, both the transmitter and the receiver, are supplied with different levels of network side information (NSI), i.e. primary messages and partial channel side information (CSI). We investigate how this side information can be taken into account in the cognitive system design and how interference affects the behaviour of the beamforming solution. Through numerical simulations, we illustrate the impact of partial CSI on system performance and discuss its implications on the feasibility of cognitive systems.

关键词： Beamforming space time block coding transmitter receivers external disturbance cognitive function Cognitive radio System performance side information

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Generalized Distributive Law for ML Decoding of STBCs: Further Results 2012

Generalized Distributive Law for ML Decoding of STBCs: Furth...

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IEEE International Symposium on Information Theory

作者： Natarajan, Lakshmi Prasad Rajan, B. Sundar IISc Dept ECE Bangalore 560012 Karnataka India

ISBN: (纸本)9781467325790

The problem of designing good space-time block Codes (STBCs) with low maximum-likelihood (ML) decoding complexity has gathered much attention in the literature. All the known low ML decoding complexity techniques utilize the same approach of exploiting either the multigroup decodable or the fast-decodable (conditionally multigroup decodable) structure of a code. We refer to this well known technique of decoding STBCs as Conditional ML (CML) decoding. In [1], we introduced a framework to construct ML decoders for STBCs based on the Generalized Distributive Law (GDL) and the Factor-graph based Sum-Product Algorithm, and showed that for two specific families of STBCs, the Toepltiz codes and the Overlapped Alamouti Codes (OACs), the GDL based ML decoders have strictly less complexity than the CML decoders. In this paper, we introduce a 'traceback' step to the GDL decoding algorithm of STBCs, which enables roughly 4 times reduction in the complexity of the GDL decoders proposed in [1]. Utilizing this complexity reduction from 'traceback', we then show that for any STBC (not just the Toeplitz and Overlapped Alamouti Codes), the GDL decoding complexity is strictly less than the CML decoding complexity. For instance, for any STBC obtained from Cyclic Division Algebras that is not multigroup or conditionally multigroup decodable, the GDL decoder provides approximately 12 times reduction in complexity compared to the CML decoder. Similarly, for the Golden code, which is conditionally multigroup decodable, the GDL decoder is only about half as complex as the CML decoder.

关键词： Distributivity Computer Programming Languages DEcoding division algebra Codes Complexity decoders space time block coding

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An Alternate View of Transmit Diversity for the Collocated MIMO System

An Alternate View of Transmit Diversity for the Collocated M...

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International Symposium on Information Theory and its Applications (ISITA)

作者： Muralidharan, Vijayvaradharaj T. Rajan, B. Sundar IISc Dept ECE Bangalore 560012 Karnataka India

ISBN: (纸本)9784885522673

We present an alternate view of transmit diversity for the Multiple Input Multiple Output (MIMO) system with collocated antennas in terms of certain subspaces determined by the signal set used. For a MIMO system with n(t) antennas at the transmitter, with spatial multiplexing, deep fades are shown to occur when all the rows of the channel fade coefficient matrix fall in a finite number of n(t) - 1 dimensional vector subspaces of C-nt referred as the singular fade subspaces, which depend on the signal set used. It is the presence of these harmful singular fade subspaces which results in a transmit diversity order 1 for a MIMO system with spatial multiplexing. For a space time block Code (STBC), the singular fade subspaces depend on the design matrix of the STBC as well as the signal set used. Full transmit diversity STBCs ensure a transmit diversity order of n(t) for a signal set, by totally removing all the n(t) - 1 dimensional singular fade subspaces which were present for the MIMO spatial multiplexing system. In general, for an STBC over a signal set, if there exists a singular fade subspace of dimension d, where 0 <= d < n(t), there would exist a pair-wise error event whose transmit diversity order is n(t) - d. The notion of singular fade subspaces is extremely helpful for the design of network coding schemes in a wireless two-way relaying scenario, in which two end nodes exchange bi-directional information with the help of a relay.

关键词： multiple input multiple output systems diversity reception Subspace space time block coding space division multiplexing Singular design matrix Signal Devices Network design

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An Adaptive Conditional Zero-Forcing Decoder with Full-diversity, Least Complexity and Essentially-ML Performance for STBCs

An Adaptive Conditional Zero-Forcing Decoder with Full-diver...

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International Symposium on Information Theory and its Applications (ISITA)

作者： Natarajan, Lakshmi Prasad Rajan, B. Sundar IISc Dept ECE Bangalore 560012 Karnataka India

ISBN: (纸本)9784885522673

A low complexity decoding technique with an essentially-ML performance for the Golden code and the 3 antenna Perfect code was introduced by Sirianunpiboon, Howard & Calderbank. Though no theoretical analysis of the decoder was given, the simulations showed that this decoding technique has almost maximum-likelihood (ML) performance. Inspired by this technique, in this paper we introduce two new low complexity decoders for space-time block Codes (STBCs) - the Adaptive Conditional Zero-Forcing (ACZF) decoder and the ACZF decoder with successive interference cancellation (ACZF-SIC), which include as a special case the decoding technique of Sirianunpiboon et al. We show that both ACZF and ACZF-SIC decoders are capable of achieving full-diversity under Rayleigh fading, and we give sufficient conditions for an STBC to give full-diversity with these decoders. We then show that the Golden code, the 3 and 4 antenna Perfect codes, the 3 antenna Threaded Algebraic space-time code and the 4 antenna rate 2 code of Srinath & Rajan are all full-diversity ACZF/ACZF-SIC decodable with complexity strictly less than that of their ML decoders. Simulations show that the proposed decoding method performs identical to ML decoding for all these five codes. These STBCs along with the proposed decoding algorithm outperform all known codes in terms of both decoding complexity and error performance for N-t <= 4 transmit antennas. We further provide a lower bound on the complexity of full-diversity ACZF/ACZF-SIC decoding. The proposed decoders for all the five codes listed above achieve this lower bound and hence are optimal in terms of minimizing the ACZF/ACZF-SIC decoding complexity.

关键词： decoders DEcoding space time block coding Codes Computer Programming Languages Complexity decoding algorithm ANTENNA antennae simulating error performance

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Power-efficient relay selection in cooperative networks using decentralized distributed space-time block coding

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EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2008年第unknown期2008卷 362809-1-362809-10-0页

作者： Zhang, Lu Cimini, Leonard J., Jr. Univ Delaware Dept Elect & Comp Engn Newark DE 19716 USA

Distributed space-time block coding (Dis-STBC) achieves diversity through cooperative transmission among geographically dispersed nodes. In this paper, we present a power-efficient relay-selection strategy for decentralized Dis-STBC in a selective decode-and-forward cooperative network. In particular, for a two-stage network, each decoded node broadcasts a small amount of information with limited power. This node then utilizes its own and its neighbors' information to decide whether or not to act as a relay for the source information. In this way, only part of the decoded set will act as relays. Further, by applying the idea of this relay-selection strategy to each relaying hop in a multihop network, a power-efficient hop-by-hop routing strategy is formulated. The outage analyses and simulations are presented to illustrate the advantage of these strategies. Copyright (c) 2008 L. Zhang and L. J. Cimini Jr.. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

关键词： Information source relay wireless multi-hop networks space time block coding Distribute block codes Decentralized

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