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MIMO传输技术在卫星通信中的应用
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作者 肖潇 梁亚均 +1 位作者 王毅 王新荣 《卫星电视与宽带多媒体》 2023年第11期4-6,共3页
为解决卫星通信高速高质量数据传输要求,需要借助先进的通信传输技术实现对卫星通信的频谱利用率和系统容量进行提升。而MIMO(Multiple Input Multiple Output)传输技术是地面无线蜂窝网络中的一项技术,将其多天线技术与卫星通信系统两... 为解决卫星通信高速高质量数据传输要求,需要借助先进的通信传输技术实现对卫星通信的频谱利用率和系统容量进行提升。而MIMO(Multiple Input Multiple Output)传输技术是地面无线蜂窝网络中的一项技术,将其多天线技术与卫星通信系统两者进行有效结合,既可以实现对卫星通信的性能进行优化,改善交叉极化影响,还能够利用空间分集传输,实现对通信干扰的消除。基于此,本文对MIMO传输技术在卫星通信的单卫星系统双极化系统以及双卫星协作系统中应用分别进行了研究,然后通过仿真实验验证了MIMO传输技术在卫星通信中的可行性。实验结果表明,该传输技术的应用能够促进卫星通信传输性能得到提高,还可以消除卫星系统的干扰。 展开更多
关键词 mimo传输技术 卫星通信 卫星应用 通信技术 消除干扰 空间相关性
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分簇ad hoc网络协同MIMO传输策略 被引量:3
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作者 冯文江 赵伟 王东 《通信学报》 EI CSCD 北大核心 2012年第3期1-9,共9页
对协同MIMO传输所具有的潜力进行研究,提出一种适用于分簇ad hoc网络的传输策略,包括2个主要方面:其一是加权协同节点选择算法,该算法综合考虑节点间不对称的双向信道状态、节点剩余能量和节点连接度等因素,选择最优节点的集合构成协同M... 对协同MIMO传输所具有的潜力进行研究,提出一种适用于分簇ad hoc网络的传输策略,包括2个主要方面:其一是加权协同节点选择算法,该算法综合考虑节点间不对称的双向信道状态、节点剩余能量和节点连接度等因素,选择最优节点的集合构成协同MIMO系统;其二是虚拟节点之间虚拟链路的建立及维护机制。仿真表明,有节点选择的协同MIMO比SISO传输能获得更大的信道容量,比无节点选择的协同MIMO传输降低能耗约70%。 展开更多
关键词 协同mimo传输 信道状态信息 剩余能量 连接度
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LTE系统中混合MIMO传输模式的MMSE均衡器设计及其性能仿真 被引量:1
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作者 王会琦 马洪 《China Communications》 SCIE CSCD 2010年第5期154-160,共7页
本文在介绍LTE系统支持的各种MIMO传输模式基础上得出下行混合MIMO传输模式的接收信号模型,并且设计出了基于MMSE准则的均衡器来抑制这种混合干扰;为了提高系统仿真效率,本文还推导出了实际信道估计中,基于信道响应矩阵随机扰动的... 本文在介绍LTE系统支持的各种MIMO传输模式基础上得出下行混合MIMO传输模式的接收信号模型,并且设计出了基于MMSE准则的均衡器来抑制这种混合干扰;为了提高系统仿真效率,本文还推导出了实际信道估计中,基于信道响应矩阵随机扰动的信千噪比修正公式,并通过链路仿真和系统仿真对比给出修正因子曲线。最后的仿真还给出了混合MIIV10传输模式环境下,不同传输模式用户的误码率和吞吐量变化曲线,结果对实际LTE系统的性能分析有很大的参考价值。 展开更多
关键词 通信传输技术 混合mimo传输模式 MMSE均衡器 LTE OFDM
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面向超可靠低时延通信的有限块长MIMO传输理论与技术
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作者 沈弘 朱鹏程 +5 位作者 刘平川 孙羿 李至诚 张睿 许威 尤肖虎 《中国科学:信息科学》 CSCD 北大核心 2024年第5期1055-1077,共23页
超可靠低时延通信是5G及未来6G无线通信系统的重要组成部分.针对该类通信场景,如何从MIMO传输的角度实现时延和可靠性的最佳折中,是近年来备受关注的一项研究课题.由于现有基于长包假设的经典MIMO传输体系难以满足系统对于时延和可靠性... 超可靠低时延通信是5G及未来6G无线通信系统的重要组成部分.针对该类通信场景,如何从MIMO传输的角度实现时延和可靠性的最佳折中,是近年来备受关注的一项研究课题.由于现有基于长包假设的经典MIMO传输体系难以满足系统对于时延和可靠性的严苛要求,亟需研究更具挑战性的有限块长MIMO传输理论和技术.本文围绕有限块长MIMO信息论、发射机以及接收机设计的已有研究工作进行全面总结,并重点介绍二维空时信道编码以及MIMO一体化接收机等新型技术,为显著提升超可靠低时延通信的性能提供指导.另外,本文简要介绍了作者所在课题组搭建的MIMO超可靠低时延试验验证平台,为后续相关理论与算法的验证奠定试验基础. 展开更多
关键词 超可靠低时延通信 有限块长 mimo传输 二维空时信道编码 mimo一体化接收机
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MIMO无线传输技术综述 被引量:17
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作者 李忻 黄绣江 聂在平 《无线电工程》 2006年第8期42-47,共6页
MIMO无线传输技术是通信领域的一项重要技术突破,它能在不增加带宽与功率的情况下成倍地提高无线通信系统的容量和频谱效率,堪称新一代无线通信系统中的关键技术之一,近年来引起了人们的广泛关注与研究兴趣。回顾无线移动通信的发展历程... MIMO无线传输技术是通信领域的一项重要技术突破,它能在不增加带宽与功率的情况下成倍地提高无线通信系统的容量和频谱效率,堪称新一代无线通信系统中的关键技术之一,近年来引起了人们的广泛关注与研究兴趣。回顾无线移动通信的发展历程,概述天线分集技术与智能天线技术,剖析MIMO无线传输技术的原理与国内外研究现状:传统单天线系统向多天线系统演进、智能天线向多天线系统演进、MIMO无线传输技术的原理、MIMO系统中的分集与复用、MIMO无线信道建模、MIMO系统中的多天线设计等,为深入认识与进一步研究MIMO无线传输技术奠定基础。 展开更多
关键词 mimo传输技术 天线分集 智能天线 空间复用 信道建模 多天线设计
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大规模MIMO技术在未来5G通信系统中的展望
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作者 董健 周普成 《移动信息》 2015年第8期32-33,共2页
多输入多输出(MIMO)技术能够在不消耗额外资源的条件下成倍增加信道容量,已成为未来移动通信的核心技术之一,但同时MIMO系统仍有许多关键问题亟待解决。本文主要讨论了信道状态信息获取及多用户上下行无线传输技术等大规模MIMO传输关键... 多输入多输出(MIMO)技术能够在不消耗额外资源的条件下成倍增加信道容量,已成为未来移动通信的核心技术之一,但同时MIMO系统仍有许多关键问题亟待解决。本文主要讨论了信道状态信息获取及多用户上下行无线传输技术等大规模MIMO传输关键技术的研究进展,目的在于进一步挖掘MIMO的潜力,促进MIMO技术在未来移动通信中的应用。 展开更多
关键词 mimo传输技术 多用户上下行无线传输技术
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A Cooperative MIMO Transmission Scheme for Cluster-based Wireless Sensor Networks 被引量:3
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作者 Ding Jie Liu Danpu Wu Huari 《China Communications》 SCIE CSCD 2010年第5期14-22,共9页
Wireless sensor network is becoming more and more popular in recent years, but energy- constrained characteristic of sensor nodes is one of the critical issues that we must consider in system design. In this paper, a ... Wireless sensor network is becoming more and more popular in recent years, but energy- constrained characteristic of sensor nodes is one of the critical issues that we must consider in system design. In this paper, a cluster-based virtual VBLAST transmission scheme is proposed to achieve energy savings for energy-constrained wireless sensor networks. In the proposed scheme, instead of using cluster member as cooperative nodes, multiple cluster heads cooperate to form virtual antenna array so that V-BLAST based virtual MIMO transmission can be implemented. Based on the communication energy consumption model, a way to optimize the parameters for the scheme is given. In addition, detailed simulation is performed to evaluate the performance of the proposed scheme for both densely and sparsely deployed sensor networks. Theoretical analysis and simulation results verify the energy efficiency of the proposed scheme. 展开更多
关键词 energy efficiency virtual mimo VBLAST CLUSTER wireless sensor networks
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Rayleigh Quotient Based Interference Alignment Spectrum Sharing in MIMO Cognitive Radio Networks 被引量:1
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作者 RONG MEI 《China Communications》 SCIE CSCD 2015年第6期96-105,共10页
An interference alignment(IA)spectrum sharing method based on Rayleigh quotient is proposed for distributed multi-user multi-antenna cognitive radio(CR) networks.The interference from cognitive users(CUs)to the primar... An interference alignment(IA)spectrum sharing method based on Rayleigh quotient is proposed for distributed multi-user multi-antenna cognitive radio(CR) networks.The interference from cognitive users(CUs)to the primary(PR) system is constrained through the Rayleigh quotients of channel matrices to deal with the absence of PR users(PUs) in the IA process.As a result,the IA scheme can be applied in CR networks without harmful interference to PUs.Compared with existing IA based spectrum sharing methods,the proposed method is more general because of breaking the restriction that CUs can only transmit on the idle sub-channels of the PR system.Moreover,in comparison to other four spectrum sharing methods applicable in general scene,the proposed method leads to improved performance of achievable sum rate of the CR system as well as guarantees the transmission of PUs. 展开更多
关键词 cognitive radio spectrum sharing Rayleigh quotient interference alignment mimo
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A Limited Feedback Transmission Scheme Based on MS Compensation in the 3D MIMO System
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作者 HAN Dongsheng YANG Wei +1 位作者 PENG Yuefeng ZHU Yuan 《China Communications》 SCIE CSCD 2014年第A02期102-110,共9页
In a three-dimensional (3D) multiple- input multiple-output (MIMO) system, the base station can use both horizontal and vertical spaces, transmitting spatial beam to users more accurately. This system has caught t... In a three-dimensional (3D) multiple- input multiple-output (MIMO) system, the base station can use both horizontal and vertical spaces, transmitting spatial beam to users more accurately. This system has caught the attention of researchers in recent years. The existing research on the 3D MIMO technology is based on the assumption that the base station can acquire the ideal channel state information (CSI), which is not actually the case in real systems. Therefore, this paper introduces a limited feedback transmission scheme based on mobile station (MS) compensation in the 3D MIMO system. In this scheme, the vertical antenna gain of the 3D MIMO system compensation is assigned to the MS. Two CSI-RS ports are configured at the base station, omnidirectional CSI-RS port and partial CSI-RS port. The MS can calculate the horizontal CSI and the vertical beam gain according to omnidirectional CSI-RS port and partial CSI- RS port, respectively. Partial CSI-RS resources are used to calculate the channel after being weighted by the vertical beam vector, MS selects the optimal vertical precoding vector. Simulations show that compared with the reference strategy, the transmission scheme with limited feedback based on the MS compensation proposed in this article has more advantages. The average spectral efficiency of the system and the cell edge spectral efficiency can be greatly improved. 展开更多
关键词 3D mimo CSI FEEDBACK vertical beam gain PRECODING
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Selective transmission and channel estimation in massive MIMO systems 被引量:5
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作者 杨睿哲 Zong Liang +2 位作者 Si Pengbo Ma Dawei Zhang Yanhua 《High Technology Letters》 EI CAS 2016年第1期99-106,共8页
Massive MIMO systems have got extraordinary spectral efficiency using a large number of base station antennas,but it is in the challenge of pilot contamination using the aligned pilots.To address this issue,a selectiv... Massive MIMO systems have got extraordinary spectral efficiency using a large number of base station antennas,but it is in the challenge of pilot contamination using the aligned pilots.To address this issue,a selective transmission is proposed using time-shifted pilots with cell grouping,where the strong interfering users in downlink transmission cells are temporally stopped during the pilots transmission in uplink cells.Based on the spatial characteristics of physical channel models,the strong interfering users are selected to minimize the inter-cell interference and the cell grouping is designed to have less temporally stopped users within a smaller area.Furthermore,a Kalman estimator is proposed to reduce the unexpected effect of residual interferences in channel estimation,which exploits both the spatial-time correlation of channels and the share of the interference information.The numerical results show that our scheme significantly improves the channel estimation accuracy and the data rates. 展开更多
关键词 multiple-input multiple-output mimo selective transmission time-shifted pilots KALMAN
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Statistical Modeling of the High Altitude Platform Dual-Polarized MIMO Propagation Channel 被引量:4
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作者 Mingchuan Yang Shuo Zhang +2 位作者 Xinye Shao Qing Guo Wenyan Tang 《China Communications》 SCIE CSCD 2017年第3期43-54,共12页
In order to investigate the benefit of multiple-input multiple-output(MIMO) technique applying to the high altitude platform(HAP), a 2×2 MIMO statistical model, which can accurately describe the channel between H... In order to investigate the benefit of multiple-input multiple-output(MIMO) technique applying to the high altitude platform(HAP), a 2×2 MIMO statistical model, which can accurately describe the channel between HAP and high-speed train, is presented. And dual polarization diversity is particularly considered. Based on first-order three-state Markov chain, the single-input single-output(SISO) channel, a subset of the MIMO channel is first established. The ray tracing approach applied to the digital relief model(DRM) which covers the railway between Xi'an and Zhengzhou is used to obtain the state probability vector and matrix of the state transition probability. The proposed model considers both Doppler shift and temporal correlation, and the polarization correlation and spatial correlation statistical properties of large-scale fading and smallscale fading are analyzed. Moreover, useful numerical results on the MIMO HAP channel outage capacity are provided based on which, significant capacity gains with respect to the conventional SISO case are illustrated. Such statistical channel model can be applied to the future wireless communication system between HAP and high-speed train. 展开更多
关键词 high altitude platform(HAP) channel model multiple-input multiple-output(mimo polarization diversity
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Cooperative MIMO MAC Transmission Using Space Codes in Wireless Sensor Network
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作者 Janakiraman Vidhya Gunasekaran Kalpana +1 位作者 Dananjayan Sathian Perumal Dananjayan 《Computer Technology and Application》 2011年第4期256-262,共7页
Wireless sensor network (WSN) requires robust and efficient communication protocols to minimise delay and save energy. The lifetime of WSN can be maximised by selecting proper medium access control (MAC) scheme de... Wireless sensor network (WSN) requires robust and efficient communication protocols to minimise delay and save energy. The lifetime of WSN can be maximised by selecting proper medium access control (MAC) scheme depending on the contention level of the network. The throughput of WSN however reduces due to channel fading effects even with the proper design of MAC protocol. Hence this paper proposes a new MAC scheme for enabling packet transmission using cooperative multi-input multi-output (MIMO) utilising space time codes(STC) such as space time block code (STBC), space time trellis code (STTC) to achieve higher energy savings and lower delay by allowing nodes to transmit and receive information jointly. The performance of the proposed MAC protocol is evaluated in terms of transmission error probability, energy consumption and delay. Simulation results show that the proposed cooperative MIMO MAC protocol provides reliable and efficient transmission by leveraging MIMO diversity gains. 展开更多
关键词 Cooperative multi-input multi-output mimo space time block code (STBC) space time trellis code (STTC) medium access control energy efficiency wireless sensor network.
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Optimal transmission strategy for spatially correlated MIMO systems with channel statistical information 被引量:1
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作者 ZHAO Zhen-shan XU Guo-zhi 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第4期615-619,共5页
In real multiple-input multiple-output (MIMO) systems, the perfect channel state information (CSI) may be costly or impossible to acquire. But the channel statistical information can be considered relatively stationar... In real multiple-input multiple-output (MIMO) systems, the perfect channel state information (CSI) may be costly or impossible to acquire. But the channel statistical information can be considered relatively stationary during long-term transmission. The statistical information can be obtained at the receiver and fed back to the transmitter and do not require frequent update. By exploiting channel mean and covariance information at the transmitter simultaneously, this paper investigates the optimal trans- mission strategy for spatially correlated MIMO channels. An upper bound of ergodic capacity is derived and taken as the per- formance criterion. Simulation results are also given to show the performance improvement of the optimal transmission strategy. 展开更多
关键词 mimo Optimal transmission strategy Channel statistical information
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一种改进的频偏估计方法及应用 被引量:1
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作者 刘凯 周渊平 《信息技术与网络安全》 2018年第1期87-91,共5页
深入研究了一种基于互相关运算的算法,此方法利用训练序列能同时完成时间同步和频偏估计,通过论证分析将频率估测范围扩展为原算法的两倍,使得该方法可以胜任更大范围的频偏估计,同时,进一步研究了如何根据实际系统的频偏估计精度要求... 深入研究了一种基于互相关运算的算法,此方法利用训练序列能同时完成时间同步和频偏估计,通过论证分析将频率估测范围扩展为原算法的两倍,使得该方法可以胜任更大范围的频偏估计,同时,进一步研究了如何根据实际系统的频偏估计精度要求来选取同步序列的长度。给出了改进后算法的仿真分析,仿真结果表明改进后的算法在大频偏下仍然具有很好的性能。最后,将算法应用到实际的2×2MIMO传输系统中,有效地解决了实际传输中频率同步问题。 展开更多
关键词 时间同步 频偏估计 互相关运算 mimo传输系统
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蜂窝结构与5G无线通信网络关键技术分析
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作者 唐健 《通信电源技术》 2021年第17期108-110,共3页
在5G技术引领移动互联网无线连接的背景下,以5G系统的蜂窝结构作为切入点进行5G资源利用价值的深入分析,在此基础上引入毫米波、大规模MIMO传输、移动基站以及新空口4项关键技术进行应用要点的梳理。从上下行解耦、选用双连接方式、利... 在5G技术引领移动互联网无线连接的背景下,以5G系统的蜂窝结构作为切入点进行5G资源利用价值的深入分析,在此基础上引入毫米波、大规模MIMO传输、移动基站以及新空口4项关键技术进行应用要点的梳理。从上下行解耦、选用双连接方式、利用优质低频资源3个方面探讨关于加快5G通信网络建设、提升通信传输质量的具体路径,以期为5G网络应用落地提供参考。 展开更多
关键词 5G无线通信 蜂窝结构 毫米波 mimo传输 空口技术
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Multi-cell massive MIMO transmission with coordinated pilot reuse 被引量:1
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作者 ZHONG Wen YOU Li +1 位作者 LIAN TengTeng GAO XiQi 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第12期2186-2194,共9页
In this paper, we propose a coordinated pilot reuse(CPR) approach to reduce the pilot overhead for multi-cell massive multi-input multi-output transmission. Unlike the conventional multi-cell pilot reuse approach in w... In this paper, we propose a coordinated pilot reuse(CPR) approach to reduce the pilot overhead for multi-cell massive multi-input multi-output transmission. Unlike the conventional multi-cell pilot reuse approach in which pilots can only be reused among different cells, the proposed CPR approach allows pilots to be reused among both inter-cell and intra-cell user equipments, and thus, pilot overhead can be efficiently reduced. For spatially correlated Rayleigh fading channels, we first present a CPR-based channel estimation method and a low complexity pilot allocation algorithm. Because CPR might lead to additional pilot interference, we develop a statistically robust uplink receiver and downlink precoder that takes channel estimation errors into account. The proposed uplink receiver and downlink precoder are robust to channel state information inaccuracy, and thus, can guarantee a certain transmission performance. Monte-Carlo simulations illustrate the significant performance improvement in net spectral efficiency offered by the proposed CPR approach. 展开更多
关键词 pilot overhead multi-cell massive mimo coordinated pilot reuse robust transceiver net spectral efficiency
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