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

共 896 条记录，以下是661-670 订阅

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Near-Optimal Power Allocation with PSO Algorithm for MIMO Cognitive Networks using multiple AF Two-Way Relays

Near-Optimal Power Allocation with PSO Algorithm for MIMO Co...

引用

IEEE International Conference on Communications (ICC)

作者： Alsharoa, Ahmad Ghazzai, Hakim Alouini, Mohamed-Slim KAUST Comp Elect & Math Sci Engn CEMSE Div Thuwal Makkah Province Saudi Arabia

ISBN: (纸本)9781479920037

In this paper, the problem of power allocation for a multiple-input multiple-output two-way system is investigated in underlay Cognitive Radio (CR) set-up. In the CR underlay mode, secondary users are allowed to exploit the spectrum allocated to primary users in an opportunistic manner by respecting a tolerated temperature limit. The secondary networks employ an amplify-and-forward two-way relaying technique in order to maximize the sum rate under power budget and interference constraints. In this context, we formulate an optimization problem that is solved in two steps. First, we derive a closed-form expression of the optimal power allocated to terminals. Then, we employ a strong optimization tool based on particle swarm optimization algorithm to find the power allocated to secondary relays. Simulation results demonstrate the efficiency of the proposed solution and analyze the impact of some system parameters on the achieved performance.

关键词： multiple-input multiple-output two-way cognitive radio particle swarm optimization

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Image reconstruction and compressive sensing in MIMO radar

Image reconstruction and compressive sensing in MIMO radar

引用

Conference on Radar Sensor Technology XVIII

作者： Sun, Bing Lopez, Juan Qiao, Zhijun Univ Texas Pan Amer Dept Math 1201 West Univ Dr Edinburg TX 78539 USA Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China Univ Texas Pan Amer Dept Math Edinburg TX 78539 USA

ISBN: (纸本)9781628410143

multiple-input multiple-output (MIMO) radar utilizes the flexible configuration of transmitting and receiving antennas to construct images of target scenes. Because of the target scenes' sparsity, the compressive sensing (CS) technique can be used to realize a feasible reconstruction of the target scenes from undersampling data. This paper presents the signal model of MIMO radar and derive the corresponding CS measurement matrix, which shows success of the CS technique. Also the basis pursuit method and total-variation minimization method are adopted for different scenes' recovery. Numerical simulations are provided to illustrate the validity of reconstruction for one dimensional and two dimensional scenes.

关键词： multiple-input multiple-output compressive sensing basis pursuit total-variation minimization

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A Simple Decision-Feedback Block Differential Detection Scheme for DSTBC 79

A Simple Decision-Feedback Block Differential Detection Sche...

引用

IEEE 79th Vehicular Technology Conference (VTC-Spring)

作者： Kubo, Hiroshi Ritsumeikan Univ Fac Sci & Engn Dept Elect & Comp Engn Kusatsu Siga 5258577 Japan

ISBN: (纸本)9781479944828

For differential space-time block coding (DSTBC), this paper proposes a simple decision-feedback block differential detection (DFBDD) scheme with small computational complexity, in order to improve tracking capability on fast time-varying fading channels. Decisions can be derived directly without computation of metrics in the proposed DFBDD. It can also employ higher-order channel prediction, which needs neither complex trellis search algorithms nor complex channel prediction recursive algorithms. Finally, computer simulation results confirm that the proposed DFBDD with higher-order channel prediction has higher tracking capability at low computational complexity than the conventional block differential detection without channel prediction.

关键词： multiple-input multiple-output differential space-time coding decision-feedback higher-order channel prediction fast time-varying fading

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A Novel Interference Alignment Scheme for Two-Cell MIMO Downlink Channels

A Novel Interference Alignment Scheme for Two-Cell MIMO Down...

引用

6th International Conference on Ubiquitous and Future Networks (ICUFN)

作者： Guo, Shuaishuai Zhang, Haixia Yuan, Dongfeng Zhao, Feng Shandong Univ Sch Informat Sci & Engn Jinan 250100 Shandong Peoples R China Guilin Univ Elect Technol Sch Informat Sci & Engn Gui Lin Guang Xi Peoples R China

ISBN: (纸本)9781479934942

In this work, we propose a novel interference alignment (IA) scheme for two-cell MIMO downlink channels. With this scheme the interference will be aligned to the same directions with the desired signals when the transmitters are sending out the same symbols, otherwise, the interference will be aligned to the orthogonal directions of the desired signals as the traditional IA scheme does. As a result, it outperforms the traditional IA schemes in terms of capacity and mutual information, which is verified by simulation results. Numerical results also show that the mutual information improvement will decrease as the modulation level goes high.

关键词： Interference Alignment multiple-input multiple-output sum capacity mutual information interference channel

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Capacity Maximization in Wireless MIMO Networks with Receiver-Side Interference Suppression 14

Capacity Maximization in Wireless MIMO Networks with Receive...

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15th ACM International Symposium on Mobile Ad Hoc Networking and Computing

作者： Wan, Peng-Jun Xu, Boliu Frieder, Ophir Ji, Sai Wang, Baowei Xu, Xiaohua IIT Dept Comp Sci Chicago IL 60616 USA Georgetown Univ Dept Comp Sci Washington DC 20057 USA Nanjing Univ IST Coll Comp & Software Nanjing 210044 Jiangsu Peoples R China Univ Toledo EECS Dept Toledo OH 43606 USA

ISBN: (纸本)9781450326209

multiple-input multiple-output (MIMO) technology provides a means of boosting network capacity without requiring additional spectrum. It has received widespread attention over the past decade from both industry and academic researchers,no w forming a key component of nearly all emerging wireless standards. Despite the huge promise and considerable attention,a rigorous algorithm-theoretic framework for maximizing network capacity in multihop wireless MIMO networks is missing in the state of the art. The existing algorithms and protocols for maximizing network capacity in multihop wireless MIMO networks are purely heuristic without any provable performance guarantees. In this paper we conduct a comprehensive algorithm study for maximizing network capacity in multihop wireless MIMO networks with receiver-side interference suppression,including the full characterization of NP-hardness and APX-hardness, the polynomial time approximation schemes,and the practical approximation algorithms with provable performance guarantees.

关键词： Capacity multiple-input multiple-output stream scheduling

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Manipulating MIMO Propagation Environment Using Tunable Passive Repeater

Manipulating MIMO Propagation Environment Using Tunable Pass...

引用

Asia-Pacific Microwave Conference Proceedings

作者： Honma, Naoki Takahashi, Yuta Tsunekawa, Yoshitaka Iwate Univ Ueda Fac Engn Morioka Iwate 0208551 Japan

ISBN: (纸本)9784902339314

A multiple-input-multiple-output (MIMO) channel manipulation using tunable passive repeater is presented in this paper. The passive repeater has multiple antennas and each of them has a phase-shifter function. The MIMO channel capacity is maximized by controlling all elements individually in the passive repeater. The effectiveness of the proposed passive repeater is evaluated numerically and experimentally. From these results, it is found that the MIMO channel capacity can be improved by about 40 % due to the tunability of the passive repeater.

关键词： Passive repeater multiple-input multiple-output capacity

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Evolution Process of a Wideband Dual Polarized MIMO antenna System for Wireless Access Point Applications 7

Evolution Process of a Wideband Dual Polarized MIMO antenna ...

引用

7th International Symposium on Telecommunications (IST)

作者： Moradikordalivand, A. Rahman, T. A. Evizal Fadoul, M. M. Univ Teknol Malaysia Fac Elect Engn Wireless Commun Ctr Skudai 81310 Johor Malaysia

ISBN: (纸本)9781479953592

In this Paper evolution process of a wideband multiple-input multiple-output (MIMO) antenna system applicable for indoor wireless Access Point (WAP) is presented. The MIMO antenna system consists of two common element microstrip-fed monopole antennas with dual polarization. Due to the physically common integration of the MIMO antenna system, maintaining a high level of isolation between the antennas is a difficult design challenge. Here, a new parasitic element is introduced in order to improve the performance of the isolation between the ports. The proposed MIMO antenna system is simulated and optimized using CST Microwave Studio. The designed antenna system was fabricated and measurement was conducted to compare the simulation and measurement results. The simulated and measured -15 dB coupling coefficient is 23% (2.3 to 2.9 GHz) to cover WiFi 2.4 GHz and long term evolution (LTE) 2.6GHz applications.

关键词： Microstrip-fed antenna multiple-input multiple-output SCFC technique dual polarized

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Performance of wireless networks in highly reflective rooms with variable absorption

Performance of wireless networks in highly reflective rooms ...

引用

作者： Intini, Anibal L. Naval Postgraduate School

学位级别：硕士

Wireless communications provide opportunities to extend the reach of command and control assets to military members separated from traditional wired networks. Indoor wireless systems are already used in a variety of applications, including office, residential, and even military environments. However, highly radio frequency (RF)-reflective rooms, such as internal shipboard compartments, well decks, and amphibious combat vehicles, represent extreme conditions for the use of these systems. While wireless communications under such extreme conditions are very difficult or even impossible due to reflected waves, changes in the environment, such as objects or human bodies moving in and out of the room, produce signal power absorption randomly. The purpose of this thesis is to find an optimized solution for the use of wireless local-area-network devices to provide acceptable throughput in the presence of reflected RF-energy and variable power absorption within reflective compartments. This thesis analyzes the performance of the standard IEEE 802.11ac in reflective environments by testing new available commercial wireless devices in order to provide online access to information and applications from such rooms.

关键词： Wireless Networks Wireless Local Area Networks WLAN WiFi Radiowave Propagation IEEE802.11ac Orthogonal Frequency Division multiplexing OFDM multiple-input multiple-output MIMO Savant Simulation. Major rules will grow employment

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Multi-User MIMO-OFDM for Indoor Visible Light Communication Systems

Multi-User MIMO-OFDM for Indoor Visible Light Communication ...

引用

IEEE Global Conference on Signal and Information Processing

作者： Qi Wangi Zhaocheng Wang Chen Qian Jinguo Quan Linglong Dai Tsinghua National Laboratory for Information Science and Technology (TNList) Department of Electronic Engineering Tsinghua University Beijing 100084 China Division of Information Science & Technology Shenzhen Graduate School Tsinghua University Shenzhen 518055 China

ISBN: (纸本)9781479975921

In this paper, we investigate an indoor multiuser visible light communication system employing multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM). For each subcarrier in OFDM, the corresponding precoding matrix is calculated in the frequency domain to eliminate multi-user interference. The distances of the multiple transmitter-receiver links are different, which results in various temporal delays and phase differences in the frequency domain. Phase information is firstly considered, whereby complex instead of real channel matrices are used for precoding, which reduces the channel correlation and achieves better performance. Moreover, two DC bias and scaling factor calculation schemes are proposed, and their performances are compared with zero forcing and minimum mean-squared error (MMSE) precoding techniques.

关键词： Visible light communication multiple-input multiple-output orthogonal frequency-division multiplexing multi-user precoding

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Low Complexity Complex Matrix Inversion Method for MIMO Communication Systems

Low Complexity Complex Matrix Inversion Method for MIMO Comm...

引用

International Conference on Wireless Communications and Signal Processing

作者： Denggao Yu Zhaohua Lu Shiwen He Bo Wu Yongming Huang Luxi Yang School of Information Science and Engineering Southeast University Zhongxing Telecom Equipment

ISBN: (纸本)9781467376884

In multiple-input multiple-output (MIMO) communication systems, complex matrix inversion is a very computationally demanding operation. Especially when the number of antennas increases, i.e., in a massive MIMO system, the complexity of matrix inversion becomes very high. Motivated by this observation, a new low complexity complex matrix inversion method, called SDF-SGR (Square root and Division Free Squared Givens' Rotations) based algorithm, is designed for MIMO channels. Square root operation is avoided in the whole algorithm, and division operation is replaced by shift operation during the Givens' rotations phase. Besides, since the scale factor z, involved in the traditional SGR, has little influence on the whole algorithm, it is removed in this SDF-SGR algorithm. Considering a 4×4 complex matrix inversion, the SDF-SGR based algorithm could reduce the multiplication operations by 13.07% compared with the traditional SGR algorithm, and the division operation is reduced by almost 52.94%.

关键词： Matrix inversion Low complexity multiple-input multiple-output Givens' rotations

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