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检索条件"主题词=multiple-input-multiple-output"

共 162 条记录，以下是111-120 订阅

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A comparison of MIMO antenna efficiency measurements performed in Anechoic Chamber and Reverberation Chamber 85

A comparison of MIMO antenna efficiency measurements perform...

引用

85th ARFTG Microwave Measurement Conference

作者： Loh, Tian-Hong Qi, Wanquan Natl Phys Lab Hampton Rd Teddington TW11 0LW Middx England Beijing Inst Radio Metrol & Measurement Beijing Peoples R China

ISBN: (纸本)9781479988877

multiple-input-multiple-output (MIMO) antenna will play a key role in the development of fifth generation (5G) wireless mobile communication systems due to their performance-enhancement capability in multipath environment. Antenna radiation efficiency is an important parameter for MIMO antenna system. In this paper, we present a comparison of MIMO antenna efficiency measurements performed in Anechoic Chamber (AC) and Reverberation Chamber (RC) at the UK National Physical Laboratory. Two commercial available directional dual polarized full LTE band MIMO antennas were measured both in AC and RC between 1 GHz and 3 GHz.

关键词： multiple-input-multiple-output Radiation Pattern Antenna Gain Antenna Radiation Efficiency Anechoic Chamber Reverberation Chamber

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Mutual Coupling Effect of Antenna Array Communications Systems for Portable Medical Devices

Mutual Coupling Effect of Antenna Array Communications Syste...

引用

4th IEEE Conference on Industrial Electronics and Applications

作者： Zhang, T. T. Ser, W. Nanyang Technol Univ Ctr Signal Proc Singapore 639798 Singapore

ISBN: (纸本)9781424427994

With the advancement made in low power BSN (Body, Sensor Network) technology, wearable and portable biomedical devices are fast emerging as the next generation healthcare monitoring and/or medical diagnostic tools. For effective real time healthcare monitoring and/or telemedicine applications, the wearable or portable devices have to be equipped with transceiver electronics to facilitate data transfer between the medical devices and the user (e.g. doctors). One crucial design of such electronics is to have a robust and small communications system. It is well known that antenna array communication systems are capable of providing a high capacity in a mobile environment. However, the use of such systems for the biomedical applications described above leads to mutual coupling effect. This paper investigates the mutual coupling effect and its effect on system capacity. An expression to describe the effect of mutual coupling for channel capacity in wideband antenna array system is derived. Simulation result shows the impact of coupling effect on channel capacity in the wideband antenna array system.

关键词： Capacity multiple-input-multiple-output mutual coupling (MC) spatial correlation (SC) array antennas

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MAX-MAXIMUM LIKELIHOOD DETECTION AND PERFORMANCE ANALYSIS FOR MIMO DECODE-AND-FORWARD RELAYING SYSTEMS

MAX-MAXIMUM LIKELIHOOD DETECTION AND PERFORMANCE ANALYSIS FO...

引用

IEEE International Conference on Computing, Communications and IoT Applications (IEEE ComComAp)

作者： Zhou, Zhenhua Zhang, Shengli Shenzhen Univ Coll Elect & Informat Engn Shenzhen Peoples R China

ISBN: (纸本)9781728119731

In this paper, we focus on the detection in the cooperative multiple-input-multiple-output systems with decode-and-forward relaying. To avoid the computational difficulty in the exhaustive search of the statistically optimal maximum likelihood detection, we develop the max-maximum likelihood detection (max-MLD) scheme for the one-way relaying network, which is based on the max-log approximation. The solution to the max-MLD is found with the use of the branch-and-bound algorithm. Then, the performance of the max-MLD is evaluated in terms of the symbol error rate. The simulation results demonstrate the superiority of the proposed detection scheme in comparison with other schemes.

关键词： multiple-input-multiple-output decode-and-forward relaying max-maximum likelihood detection branch-and-bound algorithm symbol error rate

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8-Port Quad-band MIMO Antenna with an Isolation Enhancement Technique for Sub-6 GHz 5G Applications 17

8-Port Quad-band MIMO Antenna with an Isolation Enhancement ...

引用

17th European Conference on Antennas and Propagation (EuCAP)

作者： Alam, Tanjir Cheffena, Michael Rajo-Iglesias, Eva Norwegian Univ Sci & Technol NTNU Fac Engn N-2815 Gjovik Norway Univ Carlos III Madrid Dept Signal Theory & Commun Madrid 28911 Spain

ISBN: (纸本)9788831299077

In this paper, an eight-port quad-band multiple-input-multiple-output (MIMO) antenna system with an isolation enhancement technique is presented. The proposed isolation technique is used to improve the isolation between the ports with higher mutual coupling. This technique can also be repeatedly applied between other ports to improve the isolation without affecting the impedance bandwidth and other transmission coefficients. Each radiating element of the proposed system is excited using an offset-fed coaxial port. The multiple radiating elements are placed in a double-folded symmetry fashion to reduce the number of different parameters in the global S-parameter matrix. The designed quad-band 8-port MIMO antenna system is printed on Rogers RO4350B (epsilon(r)=3.55, tan delta=0.004) substrate with dimensions of 120x70x1.52 mm(3). The proposed MIMO antenna system's frequency bands lie in 5G n77, n78, n79, and n46 sub-6 GHz bands. The simulated and measured parameters are in good agreement.

关键词： 5G 8-port isolation multi-band multiple-input-multiple-output MIMO multi-port sub-6 GHz

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An Upper Bound for the Envelope Correlation Coefficient of Antenna Clusters 18

An Upper Bound for the Envelope Correlation Coefficient of A...

引用

18th European Conference on Antennas and Propagation (EuCAP)

作者： Neuman, Vojtech Capek, Miloslav Jelinek, Lukas Czech Tech Univ Dept Elect Field Fac Elect Engn Prague Czech Republic

ISBN: (纸本)9788831299091;9798350394436

A method for finding the upper bound on the envelope correlation coefficient for an arbitrary number of antenna clusters is introduced. In the described case, the envelope correlation coefficient depends on applied feeding. The theory shows a matrix description of the problem, which overcomes the need for repeated evaluations of far-field integration for different feeding vectors. This work further presents a formula for finding the highest possible value of the envelope correlation coefficient when the feeding of one antenna cluster is fixed and only the feeding weights of the second cluster can be manipulated. The proposed theory is shown in a simple example of six parallel dipoles divided into three antenna clusters.

关键词： Antennas electromagnetics feeding optimization multiple-input-multiple-output mutual coupling convex optimization

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An adaptive inverse controller for online somatosensory microstimulation optimization

An adaptive inverse controller for online somatosensory micr...

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5th International IEEE Engineering-in-Medicine-and-Biology-Society (EMBS) Conference on Neural Engineering (NER)

作者： Li, Lin Brockmeier, Austin Francis, Joseph T. Sanchez, Justin C. Principe, Jose C. Univ Florida Dept Elect Engn Gainesville FL 32611 USA SUNY Downstate Biomed Engn Robert F Furchgott Ctr Neural & Behav Sci Brooklyn NY USA NYU Poly Brooklyn NY USA Miami Univ Dept Biomed Engn Miami Beach FL USA Univ Florida Dept Elect Engn& Biomed Engn Gainesville FL 32611 USA

ISBN: (纸本)9781424441419

Precise control of neural circuits via microstimulation is an indispensable but challenging objective in neuro-engineering. The effect of electrical stimulation is imprecise and has a spatio-temporal blurring. At the neuron level, the effects are obfuscated by the complexity of neural dynamics. This paper proposes an online multiple-input-multiple-output (MIMO) adaptive inverse controller for somatosensory microstimulation. The control of the target firing pattern is achieved by including an adaptive controller before the stimulator whose transfer function is always adjusted to be the inverse of the neural circuit transfer function. In this paper a synthetic neural circuit is built from LIF neurons to model the neural circuit. Considering a Poisson model for the target spike train, we identify the LIF neural model using a Generalized Linear Model (GLM) fitted with a maximum likelihood (ML) criterion. The controller architecture becomes the inverse of the GLM and its parameters are periodically adjusted to ensure that the input to the LIF model approximates the target spike time response. In synthetic data, the results show that this control scheme successfully determines the impulse timing and amplitude of the desired stimuli and drives the dynamic neural circuit output to follow the target firing pattern. With the simulated model, the method is able to preserve the temporal precision of neural spike trains.

关键词： Adaptation model Control systems Data models GLM Generalized Linear Model Integrated circuit modeling LIF neural model MIMO MIMO Neurons Poisson equation Poisson model Timing adaptive control adaptive inverse controller bioelectric potentials electrical stimulation impulse timing maximum likelihood criterion maximum likelihood estimation multiple-input-multiple-output neural circuits neural dynamics neural nets neuro-engineering neurophysiology online somatosensory microstimulation physiological models somatosensory phenomena spatiotemporal blurring spike train target firing pattern

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A Distributed Power Control Scheme for Cellular Network Assisted D2D Communications

A Distributed Power Control Scheme for Cellular Network Assi...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Fodor, Gabor Reider, Norbert Ericsson Res SE-16480 Stockholm Sweden Ericsson Res H-1117 Budapest Hungary

ISBN: (纸本)9781424492688

Device-to-device (D2D) communications underlaying a cellular infrastructure has recently been proposed as a means of increasing the resource utilization, improving the user throughput and extending the battery lifetime of user equipments. In this paper we propose a new distributed power control algorithm that iteratively determines the signal-to-noise-and-interference-ratio (SINR) targets in a mixed cellular and D2D environment and allocates transmit powers such that the overall power consumption is minimized subject to a sum-rate constraint. The performance of the distributed power control algorithm is benchmarked with respect to the optimal SINR target setting that we obtain using the Augmented Lagrangian Penalty Function (ALPF) method. The proposed scheme shows consistently near optimum performance both in a single-input-multiple-output (SIMO) and a multiple-input-multiple-output (MIMO) setting.

关键词： ALPF method D2D communication Interference Loading MIMO MIMO MIMO communication OFDM Power control Receivers SIMO SINR target Signal to noise ratio augmented lagrangian penalty function method cellular network cellular radio device-to-device communication distributed power control scheme iterative methods multiple-input-multiple-output power consumption power control powers transmission allocation resource utilization signal-to-noise-and-interference-ratio target single-input-multiple-output sum-rate constraint telecommunication control user equipment battery lifetime

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Coordinated Multicell Precoding for Weighted Sum Rate Maximization with Per-Cell EE Constraints 80

Coordinated Multicell Precoding for Weighted Sum Rate Maximi...

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80th IEEE Vehicular Technology Conference (VTC Fall)

作者： He, Shiwen Huang, Yongming Wang, Jiaheng Wang, Haiming Jin, Shi Yang, Luxi Southeast Univ Sch Informat Sci & Engn Nanjing 210096 Jiangsu Peoples R China Southeast Univ State Key Lab Millimeter Waves Dept Radio Engn Nanjing 210096 Jiangsu Peoples R China

ISBN: (纸本)9781479944491

Spectral efficiency (SE) and energy efficiency (EE) are both essential in future wireless communications. To improve the system performance on these two metrics, in this paper we consider the weighted sum rate maximization (WSRMax) problem subject to per-cell EE constraints and per-BS transmit power constraints in multicell multiuser downlink systems. This problem is difficult in its original form due to the introduction of new EE constraints. We first reveal that the original problem can be transformed into an equivalent parameterized polynomial form by introducing some auxiliary variables. By exploiting the concavity property with respect to each variable in the equivalent problem, an efficient block coordinate ascent algorithm is then proposed with guaranteed convergence property. Numerical results show that compared with the conventional WSRMax algorithm, in addition to fulfilling the EE requirement of each cell, our algorithm achieves a better system EE performance at the cost of a slight sum rate performance loss at a certain region and offers a new insight on the SE-EE tradeoff in wireless communication systems.

关键词： Weighted Sum Rate Maximization Per-Cell EE Constraints multiple-input-multiple-output

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Correlation Analysis of MIMO Subchannels in LOS Environments

Correlation Analysis of MIMO Subchannels in LOS Environments

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11th International Conference on Advanced Communication Technology

作者： Kim, Jongho Yoon, Young-Keun Elect & Telecommun Res Inst Radio Technol Res Dept Taejon South Korea

multiple-input-multiple-output system has the potential solution to achieve very high capacity. We present the measurement results under line-of-sight conditions. As results, the correlation between subchannels decrea... 详细信息

ISBN: (纸本)9788955191387

关键词： multiple-input-multiple-output line-of-sight correlation sounder

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On Full-Duplex Communication in Cooperative Cognitive Radio Networks

On Full-Duplex Communication in Cooperative Cognitive Radio ...

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International Conference on Computational Science and Computational Intelligence (CSIC)

作者： Lee, Seungwon Park, Sangwoo Song, Iickho Zhang, Yalei Nguyen, Mai T. P. Korea Adv Inst Sci & Technol Daejeon 34141 South Korea

ISBN: (纸本)9781509055104

Taking a full-duplex (FD) technique into account, a design of cooperative cognitive radio networks (CCRN) is addressed. The FD communication in the CCRN is enabled by employing simultaneous transmitting and receiving antennas for the secondary users. From the preliminary results via numerical evaluation, it is expected that the proposed FD multiple-input-multiple-output CCRN framework can provide a performance gain over the conventional CCRN frameworks.

关键词： Beamforming spectrum sharing full-duplex multiple-input-multiple-output simultaneous transmission and reception

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