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

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MIMO Receiver with Reduced Number of RF Chains Based on 4D Array and Software Defined Radio 27

MIMO Receiver with Reduced Number of RF Chains Based on 4D A...

引用

27th European Signal Processing Conference (EUSIPCO)

作者： Bogdan, Grzegorz Godziszewski, Konrad Yashchyshyn, Yevhen Warsaw Univ Technol Warsaw Poland

ISBN: (纸本)9789082797039

multiple-input multiple-output (MIMO) technique is expected to be extensively used in future wireless systems to increase capacity of wireless channels. Nevertheless, the capacity gain comes with a cost. In particular, multiple analog radio frequency (RF) chains are required at both the transmitter and the receiver, thereby leading to a higher implementation cost, more power consumption, and lower energy efficiency. This paper presents a receiver with only one RF chain for 2x2 MIMO transmission system. Proposed design is based on a time modulated antenna array (TMAA) with beam-steering functionality and a wideband software defined radio (SDR). Spatial streams were created by demultiplexing spectral components (sidebands) generated by periodical ON/OFF switching Number of RF chains was reduced from 2 to 1 while maintaining sufficiently low correlation of spatial streams, which is required to perform MIMO transmission. Feasibility of proposed technique is evaluated by means of experimental verification.

关键词： antenna array adaptive antenna 4D array time modulated antenna array beam-steering multiple-input multiple-output

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On the Finite Constellation Sum Rates for ZF and CI Precoding

On the Finite Constellation Sum Rates for ZF and CI Precodin...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Salem, Abdelhamid Masouros, Christos UCL Dept Elect & Elect Engn London England

ISBN: (纸本)9781538676462

This paper analyzes the performance of multi-user multiple-input multiple-output (MU-MIMO) systems, with a finite phase-shift keying (PSK) input alphabet. The achievable sum rate is investigated for two precoding techniques, namely: 1) zero forcing (ZF) precoding, 2) constructive interference (CI) precoding. In light of this, new analytical expressions for the average sum rate are derived in the two scenarios, and Monte Carlo simulations are provided throughout to confirm the analysis. Furthermore, based on the derived expressions, a power allocation scheme that can ensure fairness among the users is also investigated. The results in this paper demonstrate that, the CI strictly outperforms the ZF scheme, and the performance gap between the considered schemes depends essentially on the system parameters.

关键词： Finite constellation signaling zero forcing constructive interference multiple-input multiple-output

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Few-mode Fiber Transmission with Inline Few-Mode Erbium-Doped Fiber Amplifier

Few-mode Fiber Transmission with Inline Few-Mode Erbium-Dope...

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Conference on Next-Generation Optical Communication - Components, Sub-Systems, and Systems II

作者： Ip, Ezra Li, Ming-Jun Bennett, Kevin Bickham, Scott Huang, Yue-Kai Tanaka, Akihiro Mateo, Eduardo Hu, Junqiang Wang, Ting Korolev, Andrey Koreshkov, Konstantin Wood, William Linares, Jesus Montero, Carlos Moreno, Vincente Prieto, Xesus Yano, Yutaka Aono, Yoshiaki Tajima, Tsutomo Fukuchi, Kiyoshi NEC Labs Amer 4 Independence Way Princeton NJ 08540 USA Corning Inc Corning NY 14831 USA Univ Santiago de Compostela Santiago De Compostela Spain NEC Corp Ltd Tokyo Japan

ISBN: (纸本)9780819494160

We demonstrate wavelength-division multiplexed (WDM) and mode-division multiplexed (MDM) transmission over a fiber recirculating loop comprising of a 25-km span of low differential mode group dispersion (DMGD) few-mode fiber carrying the LP01 and LP11 mode groups, and an inline few-mode erbium-doped fiber amplifier (FM-EDFA) providing low mode-dependent gain (MDG) per span. We successfully transmitted a 10 lambda x 6 x 28-Gbaud QPSK signal over a distance of 700 km.

关键词： Space-division multiplexing mode-multiplexing few-mode fiber multiple-input multiple-output erbium-doped fiber amplifier recirculating loop wavelength-division multiplexing

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Performance Analysis of Sub-optimal Transmit and Receive Antenna Selection Strategies in Single Relay Based DF Cooperative MIMO Networks

Performance Analysis of Sub-optimal Transmit and Receive Ant...

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20th National Conference on Communications (NCC)

作者： Krishna, Vemuri Sai Bhatnagar, Manav R. Indian Inst Technol Delhi Bharti Sch Telecomm Tech & Mgmt New Delhi 110016 India Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

ISBN: (纸本)9781479923618

In this paper, we analyze the performance of two sub-optimal antenna selection strategies for single relay based selective decode-and-forward (DF) cooperative multiple-input multiple-output (MIMO) systems. We assume that the source-relay, relay-destination, and the source-destination channels follow the Rayleigh fading. We derive the closed-form expressions and the upper bounds of the symbol error rate (SER) for selective DF cooperative MIMO systems employing M-ary phase shift keying in both the antenna selection strategies. From the derived SER upper bounds, we extract the diversity orders of the system in both the selection strategies. The optimal power allocation for the source and relay is derived in both the selection strategies, which minimize the SER of DF cooperative MIMO system.

关键词： Antenna selection cooperative relay networks decode-and-forward relaying multiple-input multiple-output M-ary phase-shift keying

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Advanced Wireless Mobile Collaborative Sensing Network for Tactical and Strategic Missions 16

Advanced Wireless Mobile Collaborative Sensing Network for T...

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Conference on Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security, Defense, and Law Enforcement Applications XVI

作者： Xu, Hao Univ Nevada Dept Elect & Biomed Engn Reno NV 89557 USA

ISBN: (数字)9781510608702

ISBN: (纸本)9781510608696;9781510608702

In this paper, an advanced wireless mobile collaborative sensing network will be developed. Through properly combining wireless sensor network, emerging mobile robots and multi-antenna sensing/communication techniques, we could demonstrate superiority of developed sensing network. To be concrete, heterogeneous mobile robots including unmanned aerial vehicle (UAV) and unmanned ground vehicle (UGV) are equipped with multi-model sensors and wireless transceiver antennas. Through real-time collaborative formation control, multiple mobile robots can team the best formation that can provide most accurate sensing results. Also, formatting multiple mobile robots can also construct a multiple-input multiple-output (MIMO) communication system that can provide a reliable and high performance communication network.

关键词： unmanned aerial vehicle wireless mobile collaborative sensing network multiple-input multiple-output

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A Full Rate, New Families of General Complex Orthogonal Space-Time Block Code for 6 and 8-Antennas

A Full Rate, New Families of General Complex Orthogonal Spac...

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31st National Radio Science Conference (NRSC)

作者： Khaled, Adel M. Ghuniem, Atef M. Soliman, Heba Y. Suez Univ Fac Engn Suez Egypt Suez Canal Univ Fac Engn Ismailia Egypt Port Said Univ Fac Engn Port Said Egypt

ISBN: (纸本)9781479938209

Space-time block codes (STBCs) from orthogonal designs have attracted considerable attention due to their fast maximum-likelihood (ML) decoding and full diversity. A full rate (R=1) is achieved for 3 and 4 antennas using "triple QPSK" for complex (STBCs). This paper proposes a family of new space-time block codes (STBC) for 6 transmit antennas that achieves full rate. This paper also proposes a modified QPSK constellation scheme that can achieve the full rate for both 6 and 8 transmit antennas.

关键词： multiple-input multiple-output MIMO Space-Time Block Code STBC complex orthogonal designs Modified QPSK

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Codebook Design for Air-to-Air Communication Systems Operating in the UAM Corridor 59

Codebook Design for Air-to-Air Communication Systems Operati...

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59th Annual IEEE International Conference on Communications (IEEE ICC)

作者： Kim, Keunwoo Song, Jiho Lee, Jong-Ho Hyun, Seong-Hwan Kim, Seong-Cheol Seoul Natl Univ Sch Elect Engn Seoul 08826 South Korea Inst New Media Commun Seoul 08826 South Korea Hanyang Univ Dept Elect & Elect Engn ERICA Ansan 15588 South Korea Soongsil Univ Sch Elect Engn Seoul 06978 South Korea

ISBN: (纸本)9798350304060;9798350304053

Urban air mobility (UAM) is a subset of advanced air mobility which is provisioned to reduce traffic congestion in and around urban areas. Unlike traditional transportation, UAM operates in the airspace, which brings safety issues. Thus, ensuring robust, high-rate data transmission is a prime concern to prevent collisions and share information among UAMs. With its wide bandwidth, millimeter wave communications are regarded as a promising solution for feasible air-to-air (A2A) communications for UAMs. To compensate for the large path loss at millimeter wave bands, the use of codebook based multiple-input multiple-output signal processing has been studied due to its quality performance with low complexity. Most of existing codebooks exploit codewords producing beam patterns with equal beamwidth. However, for better communication within the UAM corridor, it is essential to design a codebook which considers the unique topology of the UAM corridor. To deal with this issue, we have developed a codebook customized for A2A communications by exploiting the spatial characteristics of the UAM corridor. Furthermore, we propose a weighting-based beamwidth allocation method, which can enhance the efficiency of data transmission. Simulation results show that the proposed codebook exhibits lower outage probability and higher spectral efficiency than conventional codebooks.

关键词： air-to-air communications codebook design multiple-input multiple-output urban air mobility

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

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

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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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Event-Triggered Prescribed Performance Control for Multi-input Multi-output Nonlinear Systems 3

Event-Triggered Prescribed Performance Control for Multi-Inp...

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3rd Conference on Fully Actuated System Theory and Applications (FASTA)

作者： Cui, En-Yuan Zhang, Jin-Xi Northeastern Univ State Key Lab Synthet Automat Proc Ind Shenyang 110819 Peoples R China

ISBN: (纸本)9798350373707;9798350373691

This research addresses the tracking control problem for a class of multi-input multi-output networked systems characterized by unknown nonlinear functions, mismatched disturbances, event-triggered inputs, and input coupling. A novel prescribed performance control strategy and actuator update protocol are proposed to address this challenge. In contrast to existing results, our approach requires the transmission of a binary signal (0 or 1) to the actuator. This not only reduces the quantity of data transmission but also minimizes the number of transmitted bits, thereby saving communication costs. Furthermore, irrespective of the unknown nonlinearities, disturbances, and measurement errors, the proposed method ensures both transient and steady-state performance in output tracking. Simulation results are provided to validate the established theoretical conclusions.

关键词： Event-triggered control multiple-input multiple-output nonlinear systems prescribed performance control

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Portable Doppler/FSK/FMCW Radar Systems for Life Activity Sensing and Human Localization 14

Portable Doppler/FSK/FMCW Radar Systems for Life Activity Se...

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14th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)

作者： Li, Changzhi Wang, Jing Rodriguez, Daniel Mishra, Ashish Peng, Zhengyu Li, Yiran Texas Tech Univ Elect & Comp Engn Dept Lubbock TX 79409 USA

ISBN: (纸本)9781728108780

This paper presents recent progress on portable Doppler, frequency-shift keying (FSK) and frequency-modulated continuous-wave (FMCW) radar systems for life activity sensing and human localization. It starts from a software-based calibration technology that significantly improves the accuracy and reliability of millimeter-wave interferometry radar front-end for physiological motion and vocal vibration detection. Then, the operation principle and unique features of FSK and FMCW radar, such as RF/digital beamforming, for human-aware sensing and localization will be presented. To reject clutter noise, which is a common challenge for practical deployment of short-range radar system, intermodulation radar technique will be discussed. Then, machine learning will be presented as an efficient approach to make the radar system smart for automatic classification and decision making. Finally, challenges for biomedical radar systems and future development directions will be discussed.

关键词： Biomedical Radar Doppler FSK FMCW multiple-input multiple-output Millimeter-wave Beamforming

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