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

共 889 条记录，以下是481-490 订阅

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Performance Analysis of Flip OFDM in Spatially Modulated MUP MIMO VLC Systems 2

Performance Analysis of Flip OFDM in Spatially Modulated MUP...

引用

2nd IEEE International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET)

作者： Srinatha, N. Jeyachitra, R. K. Natl Inst Technol Dept ECE Tiruchirappalli India

ISBN: (纸本)9781509044429

In this paper, we propose a Flip-optical orthogonal frequency division multiplexing (Flip-OOFDM) multi-user precoded (MUP) multiple-input multiple-output (MIMO) spatial modulation (SM) aided visible light communication (VLC) system. The Unipolar OFDM techniques can be used to efficiently make up the frequency selective channel distortion in a unipolar communication systems. This DC offset optical OFDM (DCO-OFDM) which is one of the conventional methods of unipolar OFDM initially recommended to the optical communications. The Flip-OFDM is other possible method that was recommended in the patent, but its full capacity and the performance has not been examined in the literature. Here, by analyzing and comparing the DCO-OFDM and Flip-OFDM in the proposed model, we show that Flip-OFDM provides high data rates and have better Bit Error Rate (BER) than DCO-OFDM.

关键词： Multi-user precoder visible light communication multiple-input multiple-output optical orthogonal frequency division multiplexing spatial modulation

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802.11ac WLAN MIMO Radio-over-Fiber Distributed-Antenna System for In-Building Networks based on Multicore Fiber 11

802.11ac WLAN MIMO Radio-over-Fiber Distributed-Antenna Syst...

引用

Photonics West OPTO Conference on Broadband Access Communication Technologies XI

作者： Morant, Maria Llorente, Roberto Univ Politecn Valencia Nanophoton Technol Ctr Camino Vera S-N E-46022 Valencia Spain

ISBN: (纸本)9781510606975;9781510606982

In this work we propose and evaluate experimentally the performance of IEEE 802.11ac WLAN standard signals in radio-over-fiber (RoF) distributed-antenna systems based on multicore fiber (MCF) for in-building WLAN connectivity. The RoF performance of WLAN signals with different bandwidth is investigated considering up to IEEE 802.11ac maximum of 160 MHz per user. We evaluate experimentally the performance of WLAN signals employing different modulation and coding schemes achieving bitrates from 78 Mbps to 1404 Mbps per user in distances up to 300 m in a 4-core MCF. The performance of the wireless standard multiple-input multiple-output (MIMO) processing algorithms included in WLAN signals applied to the RoF transmission in MCF optical systems is also evaluated. The impact on the quality of the signal from one of the cores in the MIMO processing is investigated and compared with the results achieved with single-input single-output (SISO) transmission in each core. We measured the error vector magnitude (EVM) and the OFDM data burst information of the received WLAN signals after RoF transmission for different distributed-antenna systems with uni-and bi-directional MCF communication. Finally, we compare the received EVM of a single-antenna system (SISO arrangement) with WLAN systems using two antennas (2x2 MIMO) and four antennas (4x4 MIMO).

关键词： Radio-over-fiber multi-core fiber multiple-input multiple-output MIMO processing orthogonal frequency division multiplexing (OFDM) wireless local area network (WLAN)

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Near-ML Lattice Reduction-aided Detection Scheme for Low Complexity MIMO-OFDM Systems 40

Near-ML Lattice Reduction-aided Detection Scheme for Low Com...

引用

40th International Conference on Telecommunications and Signal Processing (TSP)

作者： Lee, Hyukyeon Kim, Hyunsub Kim, Jaeseok Yonsei Univ Dept Elect & Elect Engn Seoul 03722 South Korea

ISBN: (纸本)9781509039821

In this paper, we propose a novel lattice reduction (LR) algorithm for the low-complexity multiple- input multiple-output (MIMO) detection with near-maximum-likelihood (ML) performance. The proposed LR algorithm is designed considering both the hardware complexity and the power consumption. First, a modified column traverse strategy is proposed to reduce the worst-case complexity (hardware complexity). Also, in order to reduce the average complexity (power consumption), we focus on the joint optimization by employing the early termination (ET) criterion in the context of MIMO detection, whereas the conventional approaches are based exclusively on channel characteristics. In order to make it possible for the LR-aided fixed-complexity sphere detector (FSD) to perform the partial detection, the LR process is thoroughly modified so that the ET criterion is able to be employed. Furthermore, we perform the joint optimization of these two approaches. The experimental results demonstrate that the worst-case and average complexity is reduced considerably maintaining the near-ML BER performance at the BER of 10(-5).

关键词： column traverse strategy detection early termination lattice reduction multiple-input multiple-output

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Bit-Interleaved Coded Modulation for Phase Shift Keying on the Hypersphere

Bit-Interleaved Coded Modulation for Phase Shift Keying on t...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Rachinger, Christoph Mueller, Ralf R. Huber, Johannes B. Univ Erlangen Nueremberg Erlangen Germany

ISBN: (纸本)9781509040964

We analyze the performance of Bit-Interleaved Coded Modulation (BICM) for MIMO systems employing Phase Shift Keying on the Hypersphere (PSKH), an extension of conventional PSK to higher dimensions. Because the quality of BICM relies on the bit-mapping between coded bits and signal points, PSKH constellations with superior distance properties and capacities might have poor power efficiency. In this paper, we analyze these losses in power efficiency and propose a new method to generate PSKH constellations, i.e., spherical codes, together with a BICM optimized bit-mapping. It turns out that for one bit per real dimension, individual QPSK per antenna is optimal, whereas for other constellation sizes notable gains can be achieved.

关键词： bit-interleaved coded modulation multiple-input multiple-output coded modulation spherical codes

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Outage Probability Performance Using Space Projection Algorithm in FD-MIMO Relay

Outage Probability Performance Using Space Projection Algori...

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Mediterranean Microwave Symposium (MMS)

作者： Rahman, Kazi Mustafizur Hakem, Nadir UQAT LRTCS Val Dor PQ Canada

ISBN: (纸本)9781538655757

This paper investigates the performance of Full-Duplex (FD) multiple-input multiple-output (MIMO) relays in an indoor wireless communication system. The FD-MIMO system use Amplify-and-Forward (AF) approach to reduce interferences around relay and increase throughput capacity between both ends of the link. At the relay level, a major issue is to minimize the self-interference (SI) generated by a simultaneous receiving and transmitting of the same signal. To address SI interferences, we proposed a space projection algorithm (SPA) involving Null-space projection (NSP) and subspace projection (SP) algorithms. The simulation results reveal that the proposed SPA minimized the loop interferences and boosted up the link capacity.

关键词： Full-Duplex Amplify and forward (AF) Self-interference multiple-input multiple-output Space projection algorithm Null space projection Sub space projection

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SAR Video Generation of MIMO Video SAR with Beat Frequency Division FMCW 11

SAR Video Generation of MIMO Video SAR with Beat Frequency D...

引用

11th International Conference on Signal Processing and Communication Systems (ICSPCS)

作者： Kim, Seok Yonsei Univ Sch Integrated Technol Seoul 21983 South Korea Hanwha Syst Inc Yongin 17121 Gyeonggi Do South Korea

ISBN: (纸本)9781538628874

In this paper, we present a method for generating synthetic aperture radar (SAR) video from multiple-input multiple-output (MIMO) video synthetic aperture radar (ViSAR) systems, which are suitable for operation in unmanned aerial vehicle (UAV) environments. This technique allows the analysis of stationary targets and moving targets in the SAR video. ViSAR systems are advantageous for detecting slowly moving targets since they have higher frame rates than conventional SAR systems. The MIMO ViSAR system is based on a frequency-modulated continuous wave (FMCW) SAR structure that is combined with multiple-input multiple-output (MIMO) technology, and multi-channel azimuth processing techniques. The results of analyses are presented, and their validity is verified using numerical simulations.

关键词： synthetic aperture radar video video synthetic aperture radar multiple-input multiple-output multi-channel azimuth processing frequency-modulated continuous waveform beat frequency division

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A near-ML Performance Hybrid Dijkstra and Firefly algorithm for Large MIMO Detection 8

A near-ML Performance Hybrid Dijkstra and Firefly algorithm ...

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8th International Conference on Computing, Communication and Networking Technologies (ICCCNT)

作者： Datta, Arijit Bhatia, Vimal Indian Inst Technol Discipline Elect Engn Indore 453552 Madhya Pradesh India

ISBN: (纸本)9781509030385

To meet the ever growing demand of high data rates, employing large number of antennas at the transmitter and receiver is a key feature of future advanced wireless systems. multiple-input multiple-output (MIMO) systems can provide high data rates with high spectral efficiency and have opened a new gateway in wireless systems. However, design of an efficient, robust and non-erroneous detection algorithm is a huge challenge in MIMO systems. In this paper, a hybrid algorithm has been proposed for large scale MIMO detection. The proposed algorithm is motivated by the popular firefly algorithm and dijkstra's shortest path algorithm. Simulation results reveal that the proposed hybrid algorithm outperforms the conventional zero forcing, minimum mean square error and successive interference cancellation based MIMO detection techniques in terms of bit error rate (BER) performance and achieves near maximum likelihood BER performance. This makes the proposed algorithm an appropriate candidate for reliable detection in large-MIMO systems.

关键词： Firefly algorithm Dijkstra's Shortest Path Algorithm multiple-input multiple-output Zero forcing Successive Interference Cancellation QR Decomposition Maximum likelihood

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Feasibility Demonstration of Space-Division-multiplexed Transmission of IEEE 802.11n/ac-Complaint MIMO Signals over OM3 Multimode Fiber

Feasibility Demonstration of Space-Division-Multiplexed Tran...

引用

International Topical Meeting on Microwave Photonics (MWP)

作者： Lei, Yi Li, Jianqiang Wu, Rui Wan, Zhiquan Fan, Yuting Yin, Feifei Dai, Yitang Xu, Kun Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

Using commercial IEEE 802.11n/ac access points, the feasibility of 3x3 space-division-multiplexed MIMO transmission over a single OM3 multimode fiber is experimentally demonstrated. More than two-fold multiplexing gai... 详细信息

ISBN: (纸本)9781538607626

关键词： multiple-input multiple-output Radio-over-fiber Space-division-multiplexing Multimode fiber

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

Advanced Wireless Mobile Collaborative Sensing Network for T...

引用

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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