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

共 889 条记录，以下是631-640 订阅

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Real-Time Single Channel Over-the-Air Data Acquisition for Digital Predistortion of 5G Massive MIMO Wireless Transmitters

Real-Time Single Channel Over-the-Air Data Acquisition for D...

引用

6th IEEE MTT-S International Wireless Symposium (IWS) part of China Microwave Week

作者： Wang, Xiaoyu Yu, Chao Li, Yue Hong, Wei Zhu, Anding Univ Coll Dublin RF & Microwave Res Grp Dublin Ireland Southeast Univ State Key Lab Millimeter Wave Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781728107165

In this paper, a single channel over-the-air (OTA) data acquisition approach for real-time calibration of digital predistorter in multiple-input multiple-output transmitters is proposed. By using the data acquired from the far-field OTA tests, the output of each power amplifier (PA) can be virtually reconstructed and thus the linearization reference at the main beam direction can be accurately estimated. Digital predistortion (DPD) can therefore be effectively constructed without direct measurement at PA output. Experimental results demonstrate that the proposed scheme can accurately estimate far-field main beam data and the proposed DPD can achieve excellent linearization performance.

关键词： 5G beam-forming over-the-air digital predistortion multiple-input multiple-output millimeter wave power amplifier

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Experimental MIMO VLC Systems Using Tricolor LED Transmitters and Receivers

Experimental MIMO VLC Systems Using Tricolor LED Transmitter...

引用

36th IEEE Global Communications Conference (IEEE GLOBECOM)

作者： Li, Shangbin Huang, Boyang Xu, Zhengyuan Univ Sci & Technol China Chinese Acad Sci Key Lab Wireless Opt Commun Hefei 230027 Anhui Peoples R China Tsinghua Univ Shenzhen Grad Sch Shenzhen 518055 Peoples R China

ISBN: (纸本)9781538639207

This paper shows experimental systems using R/G/B LEDs as both the emitters and narrowband filterless photodetectors to realize multiple-input multiple-output (MIMO) visible light communications. Among 9 tested color-pair links from R/G/B LEDs to R/G/B LEDs, the R-R link and B-G link exhibit the best quality. With a 2 x 2 MIMO setup, the implemented OOK system can achieve a data rate of 40kbps and 20 kbps under half duplex and full duplex designs respectively, without any amplifying and equalizing circuits. When LEDs are used as photodetectors, the measured LED impedance spectrum versus frequency implies that the performance of the LED-to-LED communication link can be significantly improved via an impedance matching amplifying and equalization circuit. Capabilities of simultaneous transmission and reception by an LED without electronic switching are experimentally observed. This feature enables continuous full duplex communication and offers an advantage over time division multiplexing.

关键词： Terms LED receiver full duplex VLC multiple-input multiple-output

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Optimal Phase Control for Joint Transmission and Reception with Beamforming

Optimal Phase Control for Joint Transmission and Reception w...

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33rd IEEE International Performance, Computing, and Communications Conference (IPCCC)

作者： Kim, Seonghyun Lee, Hojae Kwon, Beom Lee, Inwoong Lee, Sanghoon Yonsei Univ Dept Elect & Elect Engn Seoul 120749 South Korea

ISBN: (纸本)9781479975754

In this paper, we propose a joint transmission and reception with phase control for beamforming in a multi-cell environment. For generated transmit weight vectors of multiple base stations (BSs), a mobile station (MS) calculates phases to maximize an achievable rate with low rate feedback. By using the phases, the multiple transmit weight vectors are coordinated to improve the signal to noise ratio (SNR). In order to find optimal phases, we present a phase control method for the effective channel via geometrical approach.

关键词： multiple-input multiple-output joint transmission and reception phase control

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The performance of space shift keying for free-space optical communications over turbulent channels 9

The performance of space shift keying for free-space optical...

引用

Conference on Broadband Access Communication Technologies IX

作者： Abaza, Mohamed Mesleh, Raed Mansour, Ali Aggoune, El-Hadi M. Univ Tabuk Dept Elect Engn Tabuk 71491 Saudi Arabia Univ Tabuk SNCS Res Ctr Tabuk 71491 Saudi Arabia ENSTA Bretagne Lab STICC F-29806 Brest 9 France

ISBN: (纸本)9781628414776

This paper evaluates the performance of space shift keying (SSK) free-space optical communication (FSO) over moderate and strong turbulent channels. It has been shown previously that repetition codes (RCs) using intensity modulation with direct detection techniques are superior to SSK system for a spectral efficiency of 1 bit/s/Hz. It is shown in this study that SSK outperforms RCs using M-ary pulse amplitude modulation for spectral efficiencies of 3 bits/s/Hz or larger. Analytical expressions for the bit error rate for the SSK system under study are derived and extensive simulation results corroborate the correctness of the conducted analysis.

关键词： multiple-input multiple-output free-space optical communications space shift keying repetition codes pulse amplitude modulation negative-exponential channel log-normal channel

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A Novel Algorithm for MIMO Signal Classification Using Higher-Order Cumulants

A Novel Algorithm for MIMO Signal Classification Using Highe...

引用

IEEE Radio and Wireless Symposium (RWS)

作者： Muehlhaus, Michael S. Oner, Menguc Dobre, Octavia A. Jaekel, Holger U. Jondral, Friedrich K. Karlsruhe Inst Technol D-76021 Karlsruhe Germany Isik Univ Sile Turkey Memorial Univ St John NF Canada

ISBN: (纸本)9781467329323;9781467329293

Automatic modulation classification (AMC) of unknown communications signals is employed in both commercial and military applications, such as cognitive radio, spectrum surveillance, and electronic warfare. Most of the AMC methods proposed in the literature are developed for systems with a single transmit antenna. In this paper, an AMC algorithm for multiple-input multiple-output (MIMO) signals is proposed, which is based on higher-order cumulants. The use of cumulants with different orders, as well as their combinations as feature vectors are investigated. The ideal case of a priori knowledge of the channel state information (CSI) is considered, along with a setting of practical relevance, where the channel matrix is blindly estimated through independent component analysis. The performance of the proposed algorithm with different features is evaluated through simulations and compared with that of the average likelihood ratio test (ALRT).

关键词： Automatic modulation classification multiple-input multiple-output independent component analysis blind source separation higher-order cumulants

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A Blocker-Tolerant mm-Wave MIMO Receiver with Spatial Notch Filtering Using Non-Reciprocal Phase-Shifters for 5G Applications

A Blocker-Tolerant mm-Wave MIMO Receiver with Spatial Notch ...

引用

IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

作者： Mohin, Shahabeddin Araei, Soroush Barzgari, Mohammad Reiskarimian, Negar MIT 77 Massachusetts Ave Cambridge MA 02139 USA

ISBN: (纸本)9798350359480;9798350359473

This work reports a highly-linear blocker-tolerant mm-wave MIMO receiver front-end for 5G and beyond-5G applications. The proposed architecture enhances the RX linearity performance by establishing a mm-wave spatial notch filter (SNF) at the LNA output. The SNF incorporates a low-loss non-reciprocal phase-shifter architecture that can be turned off in the absence of spatial blockers. A 27-31GHz four-element MIMO receiver prototype is implemented in a 45nm SOI technology and exhibits an in-notch IP1dB of -7.8dBm with up to 41dB spatial blocker rejection. Through significant cancellation of co-channel wideband blockers, the RX achieves an EVM of -32.6dB, while receiving a wideband 256-QAM 100MS/s desired signal.

关键词： 5G blocker-tolerant digital beamforming mm-wave multiple-input multiple-output MIMO nonreciprocal phase-shifter spatial notch filter

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Range Performance Evaluation of IEEE 802.11n Devices

Range Performance Evaluation of IEEE 802.11n Devices

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： Gaonkar, Pradnya Tandur, Deepaknath Rafiq, Gulzaib ABB Corp Res Ctr Bangalore Karnataka India

ISBN: (纸本)9781479978007

The IEEE 802.11n standard utilizes multiple-input multiple-output (MIMO) technology in order to improve the throughput as well as the transmission range of the communication link. In this paper, the range performance evaluation of IEEE 802.11n standard compliant devices based on different configuration parameters, such as modulation and coding schemes, antenna numbers, and various available MIMO operational modes, is presented. The range improvement provided by IEEE 802.11n MIMO modes over the single-input single-output (SISO) system configuration is highlighted. The improved range reduces the number of required Wi-Fi devices in an area for a given reliability factor, such as the packet error rate (PER). Conversely, the reliability of a link can be improved for a given transmission range. Availability of such performance benchmark figures under different channel conditions allow the commissioning engineer to optimally design the network before the actual deployment. As a result, the overall installation/maintenance cost can be significantly reduced. The obtained results are applicable to both the traditional star as well as mesh topology networks.

关键词： IEEE 802.11n WLAN multiple-input multiple-output (MIMO) link budget over the air tests (OTA) space-time block coding (STBC) spatial division multiplexing (SDM) transmitter beamforming (TxBF) Maximal Ratio Combining (MRC) communication range packet error rate (PER) reliability performance evaluation

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An optimized Interference Alignment Algorithm Based on Dynamic Power Allocation for MIMO System 11

An optimized Interference Alignment Algorithm Based on Dynam...

引用

11th International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Liu, Yun Yuan, Hongwei Li, Ning Zhai, Lijun China Elect Technol Grp Corp CETC54 Res Inst 54 Beijing Res & Dev Ctr Beijing 100070 Peoples R China China Elect Technol Grp Corp CETC54 Res Inst 54 CETC Key Lab Aerosp Informat Applicat Beijing 100070 Peoples R China

ISBN: (纸本)9781509047437

High density small cells with large number of simultaneously connected devices will be controlled by the macro cell in the future 5G wireless standards. In this context, interference management becomes critical in achieving high spectral efficiency. An approach called interference alignment (IA) technique has shown great promise in many theoretical studies. However, the performance improvement brought by IA in the MIMO interference network has not been investigated well when combined with power allocation. In this paper, we propose a joint IA and power allocation algorithm that designed to find the interference mitigation solution and allocate power among different data streams of the users with less computational cost. The proposed algorithm combines the maximum of total system signal interference noise ratio (Max-SINR) criterion and the maximum chord distance of channel matrix criterion not only maximize the distances between the interference subspace and the signal spanned, but also further reduce the interference between users by power allocation. Further, the algorithm in this paper which does not use iterative to get the precoding matrix or the mitigation matrix minimizes the complexity of the whole system and has better engineering applicability. Finally, simulation results show that the proposed method outperforms other known interference alignment algorithms in terms of throughput and the energy efficiency, which also accord with the green communications.

关键词： Green Communications multiple-input multiple-output Interference Alignment power allocation Massive multiple-input multiple-output

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Adaptive Iterative Learning Control for a Class of MIMO Discrete-Time Nonlinear Systems 11

Adaptive Iterative Learning Control for a Class of MIMO Disc...

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11th International Conference on Computer Science & Education (ICCSE)

作者： Liu, Baobin Zhou, Wei Jiangsu Vocat Inst Commerce Sch Engn & Technol Nanjing Jiangsu Peoples R China Jiangsu Vocat Inst Commerce Sch Informat Technol Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781509022182

An adaptive iterative learning control (AILC) is proposed to release the requirement of repetitiveness for a class of multiple-input multiple-output nonlinear systems. Based on high-order internal model, the time-iteration-varying law of parametric uncertainty is expressed. Furthermore, reference trajectory and initial state are varying from iteration to iteration randomly. The asymptotic convergence of the proposed AILC method has been proved through rigorous derivation. Simulation results show that the proposed algorithm can achieve the control target well.

关键词： Adaptive iterative learning control non-repetitive uncertainty nonlinear systems multiple-input multiple-output discrete-time system

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High Isolation Dual-Polarized Dielectric Resonator Antenna for MIMO LTE Applications

High Isolation Dual-Polarized Dielectric Resonator Antenna f...

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IEEE International Conference on Electro/Information Technology (EIT)

作者： Khan, Aftab Ahmad Jamaluddin, Mohd Haizal Qureshi, Muhammad Bilal Ali, S. M. Owais Jawad, Muhammad COMSATS Inst Informat Technol Dept Elect Engn Abbottabad Kpk Pakistan Univ Teknol Malaysia Fac Elect Engn Wireless Commun Ctr WCC Johar Bahru Malaysia COMSATS Inst Informat Technol Dept Elect Engn Lahore Punjab Pakistan

ISBN: (纸本)9781538653982

In this paper high isolation dual-polarized Dielectric Resonator Antenna (DRA) for multiple-input multiple-output (MIMO) Long Term Evolution (LTE) applications is designed and fabricated. High isolation more than 50 dB is achieved through Quasi-orthogonal modes at 2.6 GHz with hybrid feeding mechanism. Port 1 and port 2 excite TEX and TEY modes through microstrip feed line and coaxial probe, respectively. The proposed design is analyzed for distinct ground planes which demonstrate negligible effect on gain and S-parameters. Simulated and measured results reveal that the proposed design is appropriate for MIMO LTE terminals.

关键词： multiple-input multiple-output isolation dielectric resonator antenna modes

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