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

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On the Secret Channel Capacity of MIMO System under Fading Environment

On the Secret Channel Capacity of MIMO System under Fading E...

引用

8th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Wang Jun Zhu Ge Yu Xiaochuan Xian Inst Space Radio Technol Sci & Technol Space Microwave Lab Xian 710100 Peoples R China

ISBN: (纸本)9781612846835;9781612846828

In this paper, the channel capacity of a multiple input multiple output (MIMO) broadcast system is investigated under correlated fading environment where there exists a transmitter, a legitimate receiver and an eavesdrop, each node equipped with multiple antennas. We derive the secret capacity and its upper bound of the MIMO broadcast channel in detail by using the Information theory and random matrices theory.

关键词： multiple-input multiple-output Secret Channel Capacity Spatial Correlation

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Multipath-Exploited Bistatic Sensing with LoS Blockage in MIMO-OFDM systems for 6G 59

Multipath-Exploited Bistatic Sensing with LoS Blockage in MI...

引用

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

作者： Wang, Xiaoyun Han, Lincong Xi, Rongyan Ma, Liang Lou, Mengting Jin, Jing Wang, Qixing Liu, Guangyi Wang, Jiangzhou China Mobile Commun Grp Corp Beijing Peoples R China China Mobile Res Inst Beijing Peoples R China Univ Kent Sch Engn Canterbury Kent England

ISBN: (纸本)9798350304060;9798350304053

Sensing is one of the key capabilities in the sixth generation (6G) networks. Multipath is a challenging problem for high-accuracy sensing. Although several solutions to multipath mitigation and exploitation have been proposed, few of them considered the line-of-sight (LoS) blockage in bistatic sensing, which is even more difficult. In this work, we explore the geometric relationship of the scatterer, the real target, as well as the "ghost target" and design an iterative sensing algorithm in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Besides the joint angle-of-departure (AoD), angle-of-arrival (AoA) estimation and the range estimation, the algorithm also contains the procedure of signal restoration and cancellation, considering the strong power difference between paths caused by multi-bounce reflection. Simulation results demonstrate the effectiveness of the designed algorithm and reveal the influence of the transmitted power as well as the target and scatterer's radar cross sections (RCSs).

关键词： 6G bistatic sensing multipath multiple-input multiple-output orthogonal frequency division multiplexing

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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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Outage Performance of Dual-Hop MIMO AF Relaying with multiple Interferences 3

Outage Performance of Dual-Hop MIMO AF Relaying with Multipl...

引用

IEEE 3rd International Conference on Signal and Image Processing (ICSIP)

作者： Wang, Yan Li, Min Army Engn Univ PLA Inst China Elect Syst Engn Corp Nanjing Jiangsu Peoples R China Inst China Elect Syst Engn Corp Beijing Peoples R China

ISBN: (纸本)9781538663967

In this paper, we investigate the outage performance of a general dual-hop multiple-input multiple-output (MIMO) amplify-and-forward (AF) relay network, where the source, relay and destination are all equipped with multiple antennas. By considering maximal-ratio-transmission (MRT) and maximal-ratio combining (MRC) for the transmitter and receiver, respectively, we first obtain the output signal-to-interference-plus-noise ratio (SINR) of the dual-hop AF relay system with multiple co-channel interferences (CCIs) and noise at the relay. Then, we derive closed-form expressions of the outage probability (OP) for both the fixed-gain and variable-gain multi-antenna relaying systems. Finally, computer simulations are carried out to validate the performance analysis. Our new analytical expressions not only provide a fast and efficient method to evaluate the outage performance of the system, but also enable us to gain valuable insights into the effects of key parameters on the performance of the dual-hop AF relaying system benefit from implementing multiple antennas at each of the three nodes in the relaying network.

关键词： amplify-and-forward relaying multiple-input multiple-output dual-hop system co-channel inteferences outage probability

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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 ...

引用

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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Channel Code Aided Decision-Directed Channel Estimation for MIMO OFDM/SDMA Systems Based on the "Expectation-Conditional Maximization Either" Algorithm

Channel Code Aided Decision-Directed Channel Estimation for ...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Zhang, Jiankang Hanzo, Lajos Mu, Xiaomin Zhengzhou Univ Sch Informat Engn Zhengzhou Peoples R China Univ Southampton Sch ECS Southampton SO17 1BJ Hants England

ISBN: (纸本)9781424456383

In this paper, a Forward Error Coded (FEC) Decision-Directed (FEC-DD) channel estimation scheme is proposed for multiple-input multiple-output (MIMO) Orthogonal Frequency Division multiplexing/Space Division multiple Access (OFDM/SDMA) systems which is based on the Expectation-Conditional Maximization Either (ECME) algorithm. The proposed DD technique is combined with the Optimised Hierarchy Reduced Search Algorithm (OHRSA) based Multi-User Detector (MUD) and directly calculates the Maximization-Step (M-Step) by conditionally maximizing the logarithmic likelihood function of the "incomplete" data. We avoid the employment of matrix inversion, since only a single subcarrier's Frequency-Domain CHannel Transfer Function (FD-CHTF) is calculated at a time, since we assume that the other subcarriers' FD-CHTFs are the most recent estimates from the previous iteration of the proposed scheme. Our simulation results have demonstrated that the proposed scheme is capable of reducing the received power requirement by 4dB upon exploiting the error correction capability of a FEC decoder within the ECME loop.

关键词： multiple-input multiple-output Orthogonal Frequency Division multiplexing/Space Division multiple Access channel estimation Expectation-Conditinal Maximization Either

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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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Reconfigurable Antennas and Distributed Bit Loading for MIMO Ad-Hoc Networks

Reconfigurable Antennas and Distributed Bit Loading for MIMO...

引用

MILCOM Military Communications Conference

作者： Kountouriotis, John Dandekar, Kapil R. Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

ISBN: (纸本)9781424481804

In this work we evaluate the performance impact of reconfigurable antennas in a multiple-input multiple-output ad-hoc network where the links are allowed to transmit at the same time and interfere with each other. To achieve this goal, we have used two Reconfigurable Circular Patch Antennas (RCPA) to take channel measurements in a 3-link topology. To quantify the performance, instead of using Shannon capacity, we restrict the links to use an integer number of bits per transmission, with constraints on an application-imposed BER, as well as total available power per link. As the focus of this paper is on ad-hoc networks, we present iterative algorithms that achieve antenna configuration selection as well as bit and power loading in a distributed manner. By using an integer number of bits as well as SINR-based BER constraints, we aim to provide a realistic evaluation of the performance impact of reconfigurable antennas in a MIMO ad-hoc network.

关键词： 3-link topology BER MIMO ad-hoc networks MIMO communication RCPA ad hoc networks antenna arrays distributed bit loading error statistics microstrip antennas multiple-input multiple-output reconfigurable circular patch antennas

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Space-time spreading for MIMO CDMA-based systems over fast-fading channels

Space-time spreading for MIMO CDMA-based systems over fast-f...

引用

International Conference on Wireless Networks, Communications and Mobile Computing

作者： Hamouda, W Concordia Univ Dept Elect & Comp Engn Montreal PQ HEG 1M8 Canada

ISBN: (纸本)0780393058

In this paper, a transmit diversity scheme based on space-time spreading for code-division multiple-access (CDMA) systems in fast-fading channels is introduced. The proposed transmit diversity scheme employs orthogonal Walsh spreading codes to exploit the time diversity introduced by the channel, and hence achieves two-fold of the diversity order obtained using conventional space-time spreading schemes. A generalization of the proposed coding scheme to systems with different antenna configurations is also discussed. For slowly-fading channels, we show that the proposed transmit diversity scheme reduces to that of conventional transmit diversity schemes with no performance degradation. For nonorthogonal spreading codes, we propose a receiver structure that employs an interference cancellation scheme to compensate for signal interference. Our results show a large performance improvement when using such an interference cancellation scheme relative to the conventional matched filter receiver.

关键词： multiple-input multiple-output space-time block codes flat-fading channels fast-fading direct-sequence code-division multiple access

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Experimental Evaluation of Open-Loop Precoding MIMO Using the Testbed Targeted at IMT-Advanced System

Experimental Evaluation of Open-Loop Precoding MIMO Using th...

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19th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Hatakawa, Yasuyuki Miyazaki, Noriaki Suzuki, Toshinori KDDI R&D Labs Inc Saitama Japan

ISBN: (纸本)9781424426430

This paper presents an experimental evaluation of open-loop precoding MIMO (multiple input multiple output) using a testbed targeted at IMT-Advanced systems. Open-loop MIMO is realized by applying Rotational OFDM (R-OFDM), that is previously proposed by authors, to MIMO transmission. MIMO R-OFDM is more robust with respect to correlated channels than conventional open-loop MIMO-OFDM, because it optimizes the distances between the constellation points using simple phase rotation. The angle of phase rotation depends on the modulation orders and coding rate, hence the receiver does not need to feed the CSI (Channel State Information) back to the transmitter. In this paper, MIMO R-OFDM is implemented in a testbed targeted at IMT-Advanced systems, it is then evaluated experimentally and by computer simulations. The results of the evaluation reveal that MIMO R-OFDM is effective in correlated channels, and the gain in terms of the CIR (Carrier to Interference Ratio) with respect to conventional MIMO OFDM to achieve PER (Packet Error Rate) = 0.01 is about 1.5 dB when MIMO R-OFDM is used in correlated channels.

关键词： Correlated Channel Experimental Evaluation multiple-input multiple-output IMT-Advanced

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