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检索条件"主题词=Multi-input Multi-Output"

共 194 条记录，以下是121-130 订阅

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SER Approximation for Orthogonal STBC over Nakagami-m Fading Channels 7

SER Approximation for Orthogonal STBC over Nakagami-<i>m</i>...

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7th International Conference on Information and Communication Systems (ICICS)

作者： Khodeir, Mahmoud A. Khatalin, Sari Jordan Univ Sci & Technol Dept Elect Engn POB 3030 Irbid Jordan

ISBN: (纸本)9781467386142

In this study, approximate symbol probability of error (i.e., symbol error rate) formulas are derived for both of the M-ary phase shift keying and M-ary quadrature amplitude modulation constellations schemes. These formulas are obtained over slow, flat, and independent and identically distributed Nakagami-m fading channels, where the orthogonal space-time block codes is utilized. This approach reduces the complexity and instability of using integrals or hyper-geometric infinite series forms to evaluate exact symbol error rate formulas. Numerical examples are presented to illustrate the new results.

关键词： Nakagami-m channel Maximal ratio combining Orthogonal space time block code Symbol error rate Bit error rate multi-input multi-output

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An Overview of Different Topologies of multi-Port DC/DC Converters for DC Renewable Energy Source Applications 13

An Overview of Different Topologies of Multi-Port DC/DC Conv...

引用

13th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)

作者： Babaei, Ebrahim Abbasi, Okhtay Sakhavati, Simin Univ Tabriz Fac Elect & Comp Engn Tabriz Iran

ISBN: (纸本)9781467397490

DC/DC converters are widely used in different applications such as renewable energy sources, hybrid electrical vehicles, and portable electronic devices. Recently, many researches have been done on dc/dc converters to increase the reliability and modularity and reduce the cost of these converters. The multi-port dc/dc converter is one of the common converters that widely used in dc renewable energy sources. The multi-port dc/dc converters are divided into single-input multi-output, multi-input single-output, and multi-input multi-output converters. The multi-input multi-output dc/dc converters can combine the different types of dc voltage sources with different V-I characteristics in input side and generate different levels of dc voltages at the output side. The main aim of using these converters is reducing the cost and number of power electronic components and increasing the reliability and efficiency of the overall system. Until now, different topologies of multi-port dc/dc converters have been presented. In this paper, some of the multi-port dc/dc converters are overviewed. Moreover, their advantages and disadvantages are investigated.

关键词： dc-dc converter multi-port dc/dc converter multi-input multi-output renewable energy sources

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Implementation of a High-throughput and Area-efficient MIMO Detector Based on Modified Dijkstra's Search

Implementation of a High-throughput and Area-efficient MIMO ...

引用

IEEE Global Telecommunications Conference (GLOBECOM 09)

作者： Kim, Tae-Hwan Park, In-Cheol Korea Adv Inst Sci & Technol Dept EE Taejon 305701 South Korea

ISBN: (纸本)9781424441471

This paper presents a VLSI implementation of a high-throughput and area-efficient MIMO detector. We propose a modified Dijkstra's algorithm and a pre-calculation technique to improve the throughput by allowing overlapped processing. In addition, we propose a simple approximation of L-2-norm to reduce the computational complexity without degrading the error performance noticeably. A MIMO detector based on the proposed algorithm is implemented using a 0.18-mu m CMOS technology, which occupies 0.49 mm(2) with 25.1K equivalent gates and shows a throughput of over 300 Mbps.

关键词： multi-input multi-output maximum-likelihood (ML) detection sphere decoding very large scale integration (VLSI) wireless communications

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Flexible frequency-band reallocation MIMO networks for real signals

Flexible frequency-band reallocation MIMO networks for real ...

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5th International Symposium on Image and Signal Processing and Analysis

作者： Eghbali, Amir Johansson, Hakan Loewenborg, Per Linkoping Univ Dept Elect Engn Div Elect Syst SE-58183 Linkoping Sweden

ISBN: (纸本)9789531841160

In this paper, a low-complexity approach to implement a class of flexible frequency-band reallocation (FFBR) multi-input multi-output (MIMO) networks, which use variable oversampled complex-modulated filter banks, is introduced. Two alternatives in processing real signals using real input/output and complex input/output FFBR networks (or simply, real and complex FFBR networks, respectively) are considered. It is shown that to process each sample, the real case requires less number of real operations compared to its complex counterpart. Furthermore, the real case has a smaller growth rate in the number of real operations with respect to the prototype filter order. In addition, the real FFBR network eliminates the need for two Hilbert transformers whereas in the complex FFBR case, to achieve high efficiency in FBR, there is a need for high-order Hilbert transformers.

关键词： flexible frequency-band reallocation multi-input multi-output discrete Fourier transform discrete Hilbert transformer complexity

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multi-cell and multi-user Detection in Uplink for MIMO Systems

Multi-cell and Multi-user Detection in Uplink for MIMO Syste...

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IEEE International Conference on Wireless Communications, Networking and Information Security (WCNIS)

作者： Chen, Jinyuan Lu, Jingyang Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100088 Peoples R China

ISBN: (纸本)9781424458516

In MIMO system, the inter-antenna interference and intra-cell interference are usually mitigated by local processing of own base station, however, inter-cell interference (ICI) is hard to be reduced effectively by the works of single cell. This paper proposes a multi-cell and multi-user detection algorithm to combat the ICI in uplink. The proposed algorithm can be implemented with the helps of multiuser detector and backhaul, as the former one is used to detect different signals from different cells and the latter one is used for sharing data information between neighboring cells. Simulation results show that the performances of proposed algorithm have great improvements in comparison to single-cell single-user detection, and have desirable gains comparing with single-cell multi-user detection.

关键词： multi-input multi-output probabilistic data association inter-cell interference multi-cell detection

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A NONLINEAR CONTROL APPROACH TO INCREASE POWER OSCILLATIONS DAMPING BY SSSC

A NONLINEAR CONTROL APPROACH TO INCREASE POWER OSCILLATIONS ...

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International Conference on Computer and Electrical Engineering

作者： Li Juan Dong Sheng Zhou Xingfu NE Dianli Univ Dept Elect Engn Jilin Peoples R China

ISBN: (纸本)9780769535043

Static Synchronous series compensator (SSSC) is a facts device that can compensate the reactive power of the line and improve the power oscillation damping The excitation control is a conventional and significant control for the power system stability This paper presents a new coordinated control scheme between SSSC and the excitation system of generator. First, three-order nonlinear model of generator and SSSC are established respectively. Then the direct feedback linearization method is used to make the nonlinear model linearized. Finally, the paper applies the optimal control theory to design the coordination controller. The proposed coordination controller shows good performance in damping out power oscillation and has a stronger robustness The MATLAB simulation results verify the validity of the offered coordinated control scheme.

关键词： power oscillation damping SSSC direct feedback linearization (DFL) multi-input multi-output optimal control theory

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Adaptive Modulation for Maximizing Practicable Sum Capacity in MU-MISO Downlink 80

Adaptive Modulation for Maximizing Practicable Sum Capacity ...

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80th IEEE Vehicular Technology Conference (VTC Fall)

作者： Banani, S. Alireza Chen, Zhuo Collings, Iain Vaughan, Rodney Univ Toronto Dept Elect & Comp Engn Toronto ON Canada CSIRO ICT Ctr Wireless & Networking Technol Lab Sydney NSW Australia Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781479944491

This paper addresses adaptive modulation and power allocation for maximizing the practicable sum capacity (sum of the uncoded throughputs of the users) of a multiuser multiple-input single-output (MU-MISO) system. Since the optimal solution, dirty paper encoding (DPC), is complicated to implement, we use the simpler linear precoding based on signal-to-leakage-plus-noise ratio (SLNR). For different choices of constellation sizes, the maximum practicable sum capacities and their corresponding optimal power allocations are obtained via individual non-convex optimization. The best constellation sizes for each user are then identified through a search for the highest maximized practicable sum capacity. Simulations demonstrate the significant performance improvement from this approach compared to existing power allocation schemes. Finally, a selection procedure between different constellation sets is presented to obtain the highest practicable sum capacity while maintaining the instantaneous BER of each user below a target value. This approach allows management of the trade-off between the capacity and error performances.

关键词： adaptive modulation multiuser multi-input multi-output power allocation practicable capacity sum capacity

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Achieving Gaussian Vector Broadcast Channel Capacity with Scalar Lattices

Achieving Gaussian Vector Broadcast Channel Capacity with Sc...

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IEEE International Symposium on Information Theory (ISIT)

作者： Sener, M. Yusuf Kramer, Gerhard Shamai (Shitz), Shlomo Boehnket, Ronald Xu, Wen Tech Univ Munich Sch Computat Informat & Technol D-80333 Munich Germany Huawei Technol Duesseldorf GmbH Munich Res Ctr D-80992 Munich Germany Technion Israel Inst Technol Dept Elect & Comp Engn IL-3200003 Haifa Israel

ISBN: (纸本)9798350382853;9798350382846

A coding scheme with scalar lattices is applied to K-receiver, Gaussian, vector broadcast channels with K independent messages, one for each receiver. The method decomposes each receiver channel into parallel scalar channels with known interference and applies dirty paper coding with a modulo interval, amplitude shift keying (ASK), and probabilistic shaping to each scalar channel. The achievable rate tuples include all points inside the capacity region by choosing truncated Gaussian shaping, large ASK alphabets, and large modulo intervals.

关键词： Broadcast channel capacity dirty paper coding multi-input multi-output lattices

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multivariable Fractional Order PI Autotuning Method for Heterogeneous Dynamic Systems

Multivariable Fractional Order PI Autotuning Method for Hete...

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3rd IFAC Conference on Advances in Proportional-Integral-Derivative Control (PID)

作者： Cajo, Ricardo Muresan, Cristina I. Ionescu, Clara M. De Keyser, Robin Plaza, Douglas Univ Ghent Fac Engn & Architecture Res Grp Dynam Syst & Control Technol Pk 914 B-9052 Zwijnaarde Belgium ESPOL Escuela Super Politecn Litoral Grp Invest Automatizac & Control Ind Campus Gustavo Galindo Km 30-5 Via Perimetral Guayaquil Ecuador Tech Univ Cluj Napoca Dept Automat Memorandumului St 28 Cluj Napoca Romania

In this paper the application of robust Fractional Order Proportional-Integral (FO-PI) autotuning control strategy is presented and applied to heterogeneous dynamic systems using decentralized control. The automatic tuning of controller gains is based on a single sine test, with user defined robustness margins guaranteed. Its performance is compared against two other fractional order controllers based on PI gain-crossover autotuning method and Internal Model Control (IMC). The closed loop control simulations applied on the heterogeneous dynamic systems indicate that the proposed method performs properly. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： multi-input multi-output KC autotuner Fractional order PI controller Fractional order IMC controller Decentralized control Heterogeneous Dynamic System

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Model-Free Adaptive Control of MIMO Nonlinear Systems With Prescribed Tracking Performance 14

Model-Free Adaptive Control of MIMO Nonlinear Systems With P...

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14th Asian Control Conference (ASCC)

作者： Ding, Wei Zhang, Jin-Xi Changshu Inst Technol Fac Elect Engn & Automat Changshu Peoples R China Northeastern Univ State Key Lab Synthet Automat Proc Ind Shenyang Peoples R China

ISBN: (纸本)9798331540845;9789887581598

This paper investigates the problem of model-free tracking control of a class of multi-input multi-output nonlinear systems with inputs coupling and external disturbances. A novel directly adaptive prescribed performance controller with the constraint transformation and the Nussbaum gain technique is developed. It guarantees that the system outputs track the reference signals with the prescribed rate, overshoot and accuracy. The controller depends on information of neither the multiplicative and additive system nonlinearities nor the external disturbances. Even so, no neural networks, fuzzy logic systems or disturbance observers are employed, yielding a simple control algorithm. The simulation results verify the effectiveness of the proposed control scheme.

关键词： Adaptive control model-free multi-input multi-output nonlinear systems prescribed performance

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