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MILCOM Military Communications Conference

作者： Kountouriotis, John Dandekar, Kapil R. Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

ISBN: (纸本)9781424481804

In this work we evaluate the performance impact of reconfigurable antennas in a multiple-input multiple-output ad-hoc network where the links are allowed to transmit at the same time and interfere with each other. To achieve this goal, we have used two Reconfigurable Circular Patch Antennas (RCPA) to take channel measurements in a 3-link topology. To quantify the performance, instead of using Shannon capacity, we restrict the links to use an integer number of bits per transmission, with constraints on an application-imposed BER, as well as total available power per link. As the focus of this paper is on ad-hoc networks, we present iterative algorithms that achieve antenna configuration selection as well as bit and power loading in a distributed manner. By using an integer number of bits as well as SINR-based BER constraints, we aim to provide a realistic evaluation of the performance impact of reconfigurable antennas in a MIMO ad-hoc network.

关键词： 3-link topology BER MIMO ad-hoc networks MIMO communication RCPA ad hoc networks antenna arrays distributed bit loading error statistics microstrip antennas multiple-input multiple-output reconfigurable circular patch antennas

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Channel Code Aided Decision-Directed Channel Estimation for MIMO OFDM/SDMA Systems Based on the "Expectation-Conditional Maximization Either" Algorithm

Channel Code Aided Decision-Directed Channel Estimation for ...

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IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Zhang, Jiankang Hanzo, Lajos Mu, Xiaomin Zhengzhou Univ Sch Informat Engn Zhengzhou Peoples R China Univ Southampton Sch ECS Southampton SO17 1BJ Hants England

ISBN: (纸本)9781424456383

In this paper, a Forward Error Coded (FEC) Decision-Directed (FEC-DD) channel estimation scheme is proposed for multiple-input multiple-output (MIMO) Orthogonal Frequency Division multiplexing/Space Division multiple Access (OFDM/SDMA) systems which is based on the Expectation-Conditional Maximization Either (ECME) algorithm. The proposed DD technique is combined with the Optimised Hierarchy Reduced Search Algorithm (OHRSA) based Multi-User Detector (MUD) and directly calculates the Maximization-Step (M-Step) by conditionally maximizing the logarithmic likelihood function of the "incomplete" data. We avoid the employment of matrix inversion, since only a single subcarrier's Frequency-Domain CHannel Transfer Function (FD-CHTF) is calculated at a time, since we assume that the other subcarriers' FD-CHTFs are the most recent estimates from the previous iteration of the proposed scheme. Our simulation results have demonstrated that the proposed scheme is capable of reducing the received power requirement by 4dB upon exploiting the error correction capability of a FEC decoder within the ECME loop.

关键词： multiple-input multiple-output Orthogonal Frequency Division multiplexing/Space Division multiple Access channel estimation Expectation-Conditinal Maximization Either

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ENVIRONMENTAL MONITORING WITH THE IMAGING MIMO RADARS MIRA-CLE AND MIRA-CLE X 30

ENVIRONMENTAL MONITORING WITH THE IMAGING MIMO RADARS MIRA-C...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Klare, Jens Saalmann, Olaf Wilden, Helmut Brenner, Andreas R. Fraunhofer Inst High Frequency Phys & Radar Tech D-53343 Wachtberg Germany

ISBN: (纸本)9781424495665

Several applications need imaging sensors for environmental monitoring which can continuously observe an area in a 24/7 mode independently from the weather and other atmospheric obscuration like dust and smoke. Imaging MIMO radar fulfills these requirements and enables the opportunity of low-cost and robust imaging systems by synthesizing many virtual antennas out of just a few real ones. MIRA-CLE is a fully configurable and expandable experimental MIMO radar in Ka-band while MIRA-CLE X works in X-band and is intended to be a low-cost experimental system for long range applications. This paper presents both MIMO radar systems and shows and discusses first imaging results of MIRA-CLE X.

关键词： MIMO multiple-input multiple-output MIMO radar MIMO SAR Imaging radar

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Non-Regenerative Multi-Hop MIMO Relays Using MMSE-DFE Technique

Non-Regenerative Multi-Hop MIMO Relays Using MMSE-DFE Techni...

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IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Rong, Yue Curtin Univ Technol Dept Elect & Comp Engn Bentley WA 6102 Australia

ISBN: (纸本)9781424456383

In this paper, we study multi-hop non-regenerative multiple-input multiple-output (MIMO) relay communications with any number of hops. We design the optimal source precoding matrix and the optimal relay amplifying matrices for such relay network where a nonlinear decision feedback equalizer (DFE) based on the minimal mean-squared error (MMSE) criterion is used at the destination node. We show that when the composite objective function is Schur-convex, the MMSE-DFE receiver together with the optimal source and relay matrices enable an arbitrary number of source symbols to be transmitted at one time, and yield a significantly improved performance compared with non-regenerative MIMO relay systems using linear receivers at the destination.

关键词： MIMO communication MMSE-DFE technique Schur-convex decision feedback equalisers decision feedback equalizer least mean squares methods minimal mean-squared error multi-hop MIMO relays multiple-input multiple-output optimal source relay matrices

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MIMO Maximum Likelihood Soft Demodulation Based on Dimension Reduction

MIMO Maximum Likelihood Soft Demodulation Based on Dimension...

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IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Lee, Jungwon Choi, Ji-Woong Lou, Hui-Ling Samsung Elect Mobile Solut Lab 4921 Directors Pl San Diego CA 92121 USA Marvell Semicond Inc Santa Clara CA USA

ISBN: (纸本)9781424456383

This paper proposes a dimension reduction maximum likelihood (ML) soft demodulator for multiple-input multiple-output (MIMO) system. The proposed dimension reduction soft demodulator reduces the dimension of the search space for minimum Euclidean distance calculation by exploiting ML hard detection algorithms and can achieve significantly lower complexity than existing optimal soft demodulators based on exhaustive or near-exhaustive search. The dimension reduction can be realized through the use of optimum MIMO hard detectors such as a sphere decoder, resulting in optimal performance. It can also be implemented using suboptimum low-complexity MIMO hard detectors such as various conventional MIMO equalizers, further reducing the complexity with slight performance degradation.

关键词： MIMO communication MIMO equalizers MIMO maximum likelihood soft demodulation ML hard detection algorithms demodulation dimension reduction soft demodulator maximum likelihood detection minimum Euclidean distance calculation multiple-input multiple-output

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Quantum evolutionary complex sphere decoder algorithm for MIMO systems

Quantum evolutionary complex sphere decoder algorithm for MI...

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6th International Conference on Wireless Communications, Networking and Mobile Computing (WICOM)

作者： Ni Liangfang Du Sidan Anhui Univ Technol Sch Elect Engn & Informat Hudong Rd 59 Maanshan Anhui Peoples R China Nanjing Univ Dept Elect Sci & Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781424437092

Quantum evolutionary complex sphere decoder algorithm (QECSDA) is proposed. A brief analysis is then given to the theoretical basis and practical performance of signal detection in multiple-input multiple-output communication systems using QECSDA. The emulation results have shown that the proposed algorithm outperforms not only the zero-forcing (ZF) detector but also the ordered successive cancellation (OSIC) detector in both a symmetrical system and an asymmetrical system.

关键词： Quntum evolution complex sphere decoder ML detection multiple-input multiple-output

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A new layered space-time detection algorithm for frequency selective fading multiple-input multiple-output channels based on particle filter

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CHINESE PHYSICS 2006年第11期15卷 2481-2488页

作者： Du Zheng-Cong Tang Bin Liu Li-Xin Univ Elect Sci & Technol China Coll Elect Engn Chengdu 610054 Peoples R China Panzhihua Univ Panzhihua 617000 Peoples R China

In this paper, a new observation equation of non-Gaussian frequency selective fading Bell Labs layered space time (BLAST) architecture system is proposed, which is used for frequency selective fading channels and non-Gaussian noise in an application environment of BLAST system. With othogonal matrix triangularization (QR decomposition) of the channel matrix, the static observation equation of frequency selective fading BLAST system is transformed into a dynamic state space model, and then the particle filter is used for space-time layered detection. Making the full use of the finite alphabet of the digital modulation communication signal, the optimal proposal distribution can be chosen to produce particle and update the weight. Incorporated with current method of reducing error propagation, a new space-time layered detection algorithm is proposed. Simulation result shows the validity of the proposed algorithm.

关键词： particle filter multiple-input multiple-output layered space-time structure frequency selective fading channels

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On the Degrees of Freedom Regions of Two-User MIMO Z and Full Interference Channels with Reconfigurable Antennas

On the Degrees of Freedom Regions of Two-User MIMO Z and Ful...

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IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Ke, Lei Wang, Zhengdao Iowa State Univ Dept ECE Ames IA 50011 USA

ISBN: (纸本)9781424456383

We study the degrees of freedom (DoF) regions of two-user multiple-input multiple-output (MIMO) Z and full interference channels in this paper. We assume that the receivers always have perfect channel state information. We derive the DoF region of Z interference channel with channel state information at transmitter (CSIT). For full interference channel without CSIT, the DoF region has been obtained in previous work except for a special case M-1 < N-1 < min(M-2, N-2), where M-i and N-i are the number of transmit and receive antennas of user i, respectively. We show that for this case the DoF regions of the Z and full interference channels are the same. We establish the achievability based on the assumption of transmitter antenna mode switching. A systematic way of constructing the DoF-achieving nulling and beamforming matrices is presented in this paper.

关键词： Degrees of freedom region Z interference channel interference channel multiple-input multiple-output

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A new layered space-time detection algorithm for frequency selective fading multiple-input multiple-output channels based on particle filter

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Chinese Physics B 2006年第11期15卷 2481-2488页

作者：杜正聪唐斌刘立新 College of Electronic Engineering University of Electronics Science and Technology of China Chengdu 610054 China Panzhihua University Panzhihua 617000 China

In this paper, a new observation equation of non-Gaussian frequency selective fading Bell Labs layered space time （BLAST） architecture system is proposed, which is used for frequency selective fading channels and non-Gaussian noise in an application environment of BLAST system. With othogonal matrix triangularization （QR decomposition） of the channel matrix, the static observation equation of frequency selective fading BLAST system is transformed into a dynamic state space model, and then the particle filter is used for space-time layered detection. Making the full use of the finite alphabet of the digital modulation communication signal, the optimal proposal distribution can be chosen to produce particle and update the weight. Incorporated with current method of reducing error propagation, a new space-time layered detection algorithm is proposed. Simulation result shows the validity of the proposed algorithm.

关键词： particle filter multiple-input multiple-output layered space-time structure frequency selective fading channels

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Subspace-based Blind Channel Estimation for MIMO-CPSC Systems with Repetition Scheme

Subspace-based Blind Channel Estimation for MIMO-CPSC System...

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2010 3rd IEEE International Conference on Computer Science and Information Technology—ICCSIT 2010

作者： Hao Lihong,Li Guangjun,Guo Zhiyong School of Communication & Information Engineering University of Electronic Science and Technology of China Chengdu,China

multiple-input multiple-output(MIMO) technology can be used in cyclic prefix single carrier(CPSC) systems to improve communication quality and *** paper proposes a blind channel estimation method for MIMO-CPSC systems with repetition *** algorithm makes use of the redundancy introduced by the repetition scheme at the transmitter to identify the channel based on a subspace ***,the proposed method obtains accurate channel estimation with fewer received *** numerical results are provided to illustrate the effectiveness of the proposed blind channel estimation method.

关键词： multiple-input multiple-output blind channel estimation cyclic prefix single carrier subspace repetition

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