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Shannon information capacity of time reversal wideband multiple-input multiple-output system based on correlated statistical channels 被引量:1
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作者 杨瑜 王秉中 丁帅 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第5期5-10,共6页
Utilizing channel reciprocity, time reversal(TR) technique increases the signal-to-noise ratio(SNR) at the receiver with very low transmitter complexity in complex multipath environment. Present research works abo... Utilizing channel reciprocity, time reversal(TR) technique increases the signal-to-noise ratio(SNR) at the receiver with very low transmitter complexity in complex multipath environment. Present research works about TR multiple-input multiple-output(MIMO) communication all focus on the system implementation and network building. The aim of this work is to analyze the influence of antenna coupling on the capacity of wideband TR MIMO system, which is a realistic question in designing a practical communication system. It turns out that antenna coupling stabilizes the capacity in a small variation range with statistical wideband channel response. Meanwhile, antenna coupling only causes a slight detriment to the channel capacity in a wideband TR MIMO system. Comparatively, uncorrelated stochastic channels without coupling exhibit a wider range of random capacity distribution which greatly depends on the statistical channel. The conclusions drawn from information difference entropy theory provide a guideline for designing better high-performance wideband TR MIMO communication systems. 展开更多
关键词 information entropy time reversal wideband multiple-input multiple-output(mimo system antenna mutual coupling
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Direction-of-arrival estimation for co-located multiple-input multiple-output radar using structural sparsity Bayesian learning 被引量:4
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作者 文方青 张弓 贲德 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第11期70-76,共7页
This paper addresses the direction of arrival (DOA) estimation problem for the co-located multiple-input multiple- output (MIMO) radar with random arrays. The spatially distributed sparsity of the targets in the b... This paper addresses the direction of arrival (DOA) estimation problem for the co-located multiple-input multiple- output (MIMO) radar with random arrays. The spatially distributed sparsity of the targets in the background makes com- pressive sensing (CS) desirable for DOA estimation. A spatial CS framework is presented, which links the DOA estimation problem to support recovery from a known over-complete dictionary. A modified statistical model is developed to ac- curately represent the intra-block correlation of the received signal. A structural sparsity Bayesian learning algorithm is proposed for the sparse recovery problem. The proposed algorithm, which exploits intra-signal correlation, is capable being applied to limited data support and low signal-to-noise ratio (SNR) scene. Furthermore, the proposed algorithm has less computation load compared to the classical Bayesian algorithm. Simulation results show that the proposed algorithm has a more accurate DOA estimation than the traditional multiple signal classification (MUSIC) algorithm and other CS recovery algorithms. 展开更多
关键词 multiple-input multiple-output radar random arrays direction of arrival estimation sparseBayesian learning
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Improved List Sphere Decoder for Multiple Antenna Systems 被引量:1
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作者 宫丰奎 葛建华 李兵兵 《Journal of Southwest Jiaotong University(English Edition)》 2008年第1期1-9,共9页
An improved list sphere decoder (ILSD) is proposed based on the conventional list sphere decoder (LSD) and the reduced- complexity maximum likelihood sphere-decoding algorithm. Unlike the conventional LSD with fix... An improved list sphere decoder (ILSD) is proposed based on the conventional list sphere decoder (LSD) and the reduced- complexity maximum likelihood sphere-decoding algorithm. Unlike the conventional LSD with fixed initial radius, the ILSD adopts an adaptive radius to accelerate the list cdnstruction. Characterized by low-complexity and radius-insensitivity, the proposed algorithm makes iterative joint detection and decoding more realizable in multiple-antenna systems. Simulation results show that computational savings of ILSD over LSD are more apparent with more transmit antennas or larger constellations, and with no performance degradation. Because the complexity of the ILSD algorithm almost keeps invariant with the increasing of initial radius, the BER performance can be improved by selecting a sufficiently large radius. 展开更多
关键词 Iterative joint detection and decoding List sphere decoding (LSD) Maximum likelihood (ML) Soft in soft out (SISO) multiple input multiple output (mimo
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A new layered space-time detection algorithm for frequency selective fading multiple-input multiple-output channels based on particle filter 被引量:1
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作者 杜正聪 唐斌 刘立新 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第11期2481-2488,共8页
In this paper, a new observation equation of non-Gaussian frequency selective fading Bell Labs layered space time (BLAST) architecture system is proposed, which is used for frequency selective fading channels and no... In this paper, a new observation equation of non-Gaussian frequency selective fading Bell Labs layered space time (BLAST) architecture system is proposed, which is used for frequency selective fading channels and non-Gaussian noise in an application environment of BLAST system. With othogonal matrix triangularization (QR decomposition) of the channel matrix, the static observation equation of frequency selective fading BLAST system is transformed into a dynamic state space model, and then the particle filter is used for space-time layered detection. Making the full use of the finite alphabet of the digital modulation communication signal, the optimal proposal distribution can be chosen to produce particle and update the weight. Incorporated with current method of reducing error propagation, a new space-time layered detection algorithm is proposed. Simulation result shows the validity of the proposed algorithm. 展开更多
关键词 particle filter multiple-input multiple-output layered space-time structure frequency selective fading channels
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Performance of terahertz channel with multiple input multiple output techniques 被引量:1
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作者 M.Bharathi S.Sasikala J.Vanmathi 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2017年第6期641-645,共5页
Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes tech... Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in THz band,wireless THz communication can be used for relatively short distances. Even,for a distance of few meters( > 5 m),the absorption coefficient is very high and hence the performance of the system is poor. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last two decades.Multiple Input Multiple Output( MIMO) Spatial diversity technique has been exploited in this paper to improve the performance in terahertz band. The results show that the Bit Error Rate( BER) is considerably improved for short distance( < 5 m) with MIMO. However,as the distance increases,the improvement in the error performance is not significant even with increase in the order of diversity. This is because,as distance increases,in some frequency bands the signal gets absorbed by water vapor and results in poor transmission. Adaptive modulation scheme is implemented to avoid these error prone frequencies. Adaptive modulation with receiver diversity is proposed in this work and has improved the BER performance of the channel for distance greater than 5 m. 展开更多
关键词 《红外与毫米波学报》 期刊 编辑工作 发行工作
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A Survey of Downlink Non-Orthogonal Multiple Access for 5G Wireless Communication Networks 被引量:9
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作者 WEI Zhiqiang YUAN Jinhong +2 位作者 Derrick Wing Kwan Ng Maged Elkashlan DING Zhiguo 《ZTE Communications》 2016年第4期17-25,共9页
Non-orthogonal multiple access (NOMA) has been recognized as a promising multiple access technique for the next generation cel-lular communication networks. In this paper, we first discuss a simple NOMA model with t... Non-orthogonal multiple access (NOMA) has been recognized as a promising multiple access technique for the next generation cel-lular communication networks. In this paper, we first discuss a simple NOMA model with two users served by a single-carrier si-multaneously to illustrate its basic principles. Then, a more general model with multicarrier serving an arbitrary number of users on each subcarrier is also discussed. An overview of existing works on performance analysis, resource allocation, and multiple-in-put multiple-output NOMA are summarized and discussed. Furthermore, we discuss the key features of NOMA and its potential re-search challenges. 展开更多
关键词 non-orthogonal multiple access (NOMA) successive interference cancellation (SIC) resource allocation multiple-input multiple-output (mimo
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基于亚模函数的可见光通信MIMO-OFDM系统天线选择算法
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作者 贾科军 贺耀民 +3 位作者 张芳芳 蔺莹 薛建彬 郝莉 《电讯技术》 北大核心 2025年第3期445-453,共9页
在可见光通信多输入多输出系统中,针对天线选择理论建模不足和穷举算法复杂度过高的问题,提出了基于亚模函数的天线选择方案。首先,以下行链路的信道容量最大化为目标,建立了基于亚模函数的天线选择理论优化模型,并证明了目标函数满足... 在可见光通信多输入多输出系统中,针对天线选择理论建模不足和穷举算法复杂度过高的问题,提出了基于亚模函数的天线选择方案。首先,以下行链路的信道容量最大化为目标,建立了基于亚模函数的天线选择理论优化模型,并证明了目标函数满足的单调亚模性。其次,根据亚模函数的收益递减效应,设计了基于容量最大化的天线选择算法。最后,仿真分析了非对称限幅光正交频分复用(Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing,ACO-OFDM)和直流偏置光OFDM(DC-biased Optical OFDM,DCO-OFDM)系统的信道容量和误码率性能。在6选4的情况下,当信噪比为30 dB时,所提算法与穷举最优算法的信道容量差异仅为0.51 b/s/Hz和1.2 b/s/Hz,复杂度则降低了约46.3%。另外,随着选择天线数的增多和调制阶数的增大,系统的误码率性能逐渐变差。 展开更多
关键词 可见光通信(VLC) 多输入多输出(mimo) 天线选择 亚模函数 收益递减效应
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感知辅助和原子选择门限机制下的MIMO-OTFS系统信道估计
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作者 彭艺 陈志翔 杨青青 《电波科学学报》 北大核心 2025年第1期155-163,共9页
针对多输入多输出正交时频空间(multiple-input multiple-output orthogonal time frequency space,MIMO-OTFS)系统由最大时延、多普勒扩展、天线数量增加带来信道估计计算开销大、准确率下降的问题,提出了一种基于感知辅助和原子选择... 针对多输入多输出正交时频空间(multiple-input multiple-output orthogonal time frequency space,MIMO-OTFS)系统由最大时延、多普勒扩展、天线数量增加带来信道估计计算开销大、准确率下降的问题,提出了一种基于感知辅助和原子选择门限的广义正交匹配追踪(sensing aided generalized orthogonal matching pursuit algorithm based on atomic threshold,SA-TGOMP)信道估计算法。该算法首先将雷达探测的用户和周围环境信息转化为OTFS信道的初始索引集,然后引入以固定值选取相关性原子进行迭代的策略和原子选择门限进行支撑集更新。实验结果表明,本文算法能够有效提高信道估计精度的同时减少导频开销。 展开更多
关键词 多输入多输出正交时频空间(mimo-OTFS) 压缩感知 感知辅助 信道估计
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User Assisted Cooperative Relaying in Beamspace Massive MIMO NOMA Based Systems for Millimeter Wave Communications 被引量:6
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作者 Jaipreet Kaur Maninder Lal Singh 《China Communications》 SCIE CSCD 2019年第6期103-113,共11页
A novel scheme‘user assisted cooperative relaying in beamspace massive multiple input multiple output(M-MIMO)non-orthogonal multiple access(NOMA)system’has been proposed to improve coverage area,spectrum and energy ... A novel scheme‘user assisted cooperative relaying in beamspace massive multiple input multiple output(M-MIMO)non-orthogonal multiple access(NOMA)system’has been proposed to improve coverage area,spectrum and energy efficiency for millimeter wave(mmWave)communications.A downlink system for M users,where base station(BS)is equipped with beamforming lens antenna structure having NRF radio frequency(RF)chains,has been considered.A dynamic cluster of users is formed within a beam and the intermediate users(in that cluster)between beam source and destination(user)act as relaying stations.By the use of successive interference cancellation(SIC)technique of NOMA within a cluster,the relaying stations relay the symbols with improved power to the destination.For maximizing achievable sum rate,transmit precoding and dynamic power allocation for both intra and inter beam power optimization are implemented.Simulations for performance evaluation are carried out to validate that the proposed system outperforms the conventional beamspace M-MIMO NOMA system for mmWave communications in terms of spectrum and energy efficiency. 展开更多
关键词 cooperative relaying system(CRS) millimeter wave(mmWave) MASSIVE multiple input multiple output(M-mimo) non-orthogonal multiple access(NOMA) power allocation sum rate
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Hybrid Precoder and Combiner Design with Finite Resolution PSs for mmWave MIMO Systems 被引量:5
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作者 Ran Zhang Weixia Zou +1 位作者 Ye Wang Mingyang Cui 《China Communications》 SCIE CSCD 2019年第2期95-104,共10页
Hybrid precoding and combining have been considered as a promising technology, which can provide a compromise between hardware complexity and system performance in millimeter wave multiple-input multiple-output system... Hybrid precoding and combining have been considered as a promising technology, which can provide a compromise between hardware complexity and system performance in millimeter wave multiple-input multiple-output systems. However, most existing hybrid precoder and combiner designs generally assume that infinite resolution phase shifters(PSs) are used to produce the analog beamformers. In a practical scene, the design with accurate PSs can lead to high hardware cost and power consumption. In this paper, we investigate the hybrid precoder and combiner design with finite resolution PSs in millimeter wave systems. We employ alternate optimization as the main strategy to jointly design analog precoder and combiner. In addition, we propose a low complexity algorithm, where the analog beamformers are implemented only by finite resolution PSs to maximize spectral efficiency. Then, the digital precoder and combiner are designed based on the obtained analog beamformers to improve the spectral efficiency. Finally, simulation results and mathematical analysis show that the proposed algorithm with low-resolution PSs can achieve near-optimal performance and have low complexity. 展开更多
关键词 millimeter wave multiple-input multiple-output FINITE RESOLUTION phase shifters HYBRID precoding alternate optimization
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Novel Channel Estimation Method in Broadband MIMO-OFDM Systems 被引量:1
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作者 焦慧颖 安建平 《Journal of Beijing Institute of Technology》 EI CAS 2007年第3期290-294,共5页
A least square (IS) parametric channel estimation method in broadband mt/ltiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed. The mean square error (MSE) p... A least square (IS) parametric channel estimation method in broadband mt/ltiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed. The mean square error (MSE) performance using optimal training pilots is also given, which proves the method can improve the estimation precision greatly in sparse channel.. Since such method needs the multi-path time delays information of the channel, the probabilistic data association (PDA) method is employed to estimate the time delay of each path. Simulation results show that both the bit error rate (BER) and the MSE performance of the proposed method are better than the traditional LS channel estimation method. 展开更多
关键词 multiple input multiple output (mimo orthogonal frequency division multiplexing (OFDM) channel estimation parametric channel model time delay estimation
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MIMO雷达通信一体化:波束图增益最大化波束成形设计
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作者 张若愚 任红 +2 位作者 陈光毅 林志 吴文 《电子与信息学报》 北大核心 2025年第3期687-695,共9页
无线通信设备数量的骤增造成频谱资源日益稀缺,通信用频逐渐向更高频段扩展,从而导致通信与雷达频段出现越来越多的重叠,雷达通信一体化被视为解决频谱拥挤实现高效共生的潜在技术。该文考虑一个多输入多输出(MIMO)雷达通信一体化系统,... 无线通信设备数量的骤增造成频谱资源日益稀缺,通信用频逐渐向更高频段扩展,从而导致通信与雷达频段出现越来越多的重叠,雷达通信一体化被视为解决频谱拥挤实现高效共生的潜在技术。该文考虑一个多输入多输出(MIMO)雷达通信一体化系统,在实现目标探测的同时进行多用户通信。首先,在满足多用户信干噪比和总功率约束的条件下,最大化目标方向的波束图增益。然后,针对一体化发射波束成形设计问题,提出基于半正定松弛(SDR)和优化最小化(MM)的两种波束成形设计方案,求解得到发射波束成形矢量。最后,仿真结果表明基于MM的方案复杂度更低,并且能够实现与基于SDR的方案几乎相同的波束图增益。此外,随着发射天线数量的增加,基于MM的方案相比于基于SDR的方案复杂度的降低程度变得更为显著。 展开更多
关键词 雷达通信一体化 多输入多输出 波束成形 波束图增益 优化最小化
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基于MIMO-OTFS通感波形的FANET快速邻居发现方法
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作者 王为栋 杨健 +3 位作者 尚佳栋 高晖 张前南 张硕 《现代防御技术》 北大核心 2025年第2期107-120,共14页
针对基于定向传输的飞行器自组织网络(flying ad-hoc network,FANET)中拓扑变化频繁、链路质量波动以及初始建网困难等问题,提出了一种基于多输入多输出(multiple-input multipleoutput,MIMO)正交时频空(orthogonal time frequency spac... 针对基于定向传输的飞行器自组织网络(flying ad-hoc network,FANET)中拓扑变化频繁、链路质量波动以及初始建网困难等问题,提出了一种基于多输入多输出(multiple-input multipleoutput,MIMO)正交时频空(orthogonal time frequency space,OTFS)通感一体化波形的感知辅助快速邻居发现方法,借助感知机制实时获取邻节点信息以加速建网效率,并采用新型的通感一体波形OTFS以对抗快变信道中的多普勒效应,提升链路质量。针对FANET场景研究物理层基于MIMOOTFS通感一体化波形的多目标检测技术;将物理层感知方案映射到上层网络中,设计感知辅助的高效邻居发现算法;最后提出一种多点通感协同机制,通过邻节点间交互感知信息和邻居发现表以间接感知及发现潜在目标,提升FANET初始建网的效率。仿真结果表明,所提方案相比传统通信组网协议可以极大降低FANET的初始建网耗时,增加目标感知精度,提升组网的整体性能。 展开更多
关键词 正交时频空 通感一体技术 邻居发现 多目标检测技术 多输入多输出
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一种基于混沌加密的奇数阶正交变换辅助MIMO收发机设计
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作者 常馨宇 邓涛 张琳 《光通信技术》 北大核心 2025年第2期57-63,共7页
针对水下可见光多输入多输出(MIMO)通信系统天线配置自由度低和安全性不足的问题,设计一种基于混沌加密的奇数阶正交变换辅助的水下可见光MIMO收发机。首先,提出了奇数阶正交矩阵生成算法,提升了水下可见光通信系统的可拓展性。其次,使... 针对水下可见光多输入多输出(MIMO)通信系统天线配置自由度低和安全性不足的问题,设计一种基于混沌加密的奇数阶正交变换辅助的水下可见光MIMO收发机。首先,提出了奇数阶正交矩阵生成算法,提升了水下可见光通信系统的可拓展性。其次,使用双混沌加密算法对传输数据进行加密,提升了水下可见光通信系统的信息传输安全性。仿真结果表明,相较于基准方案,该方案具有更优的可靠性和安全性性能。 展开更多
关键词 水下可见光通信 多输入多输出 正交变换 混沌加密 安全性
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A Low-Complexity Signal Detection Utilizing AOR Iterative Method for Massive MIMO Systems 被引量:2
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作者 Zhenyu Zhang Xiaoming Dai +2 位作者 Yuanyuan Dong Xiyuan Wang Tong Liu 《China Communications》 SCIE CSCD 2017年第11期269-278,共10页
Massive multiple-input multiple-output(MIMO) system is capable of substantially improving the spectral efficiency as well as the capacity of wireless networks relying on equipping a large number of antenna elements at... Massive multiple-input multiple-output(MIMO) system is capable of substantially improving the spectral efficiency as well as the capacity of wireless networks relying on equipping a large number of antenna elements at the base stations. However, the excessively high computational complexity of the signal detection in massive MIMO systems imposes a significant challenge for practical hardware implementations. In this paper, we propose a novel minimum mean square error(MMSE) signal detection using the accelerated overrelaxation(AOR) iterative method without complicated matrix inversion, which is capable of reducing the overall complexity of the classical MMSE algorithm by an order of magnitude. Simulation results show that the proposed AOR-based method can approach the conventional MMSE signal detection with significant complexity reduction. 展开更多
关键词 massive multiple-input multiple-output(mimo) accelerated overrelaxation(AOR) iterative method minimum mean square error(MMSE) convergence complexity
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Evaluation of Preamble Based Channel Estimation for MIMO-FBMC Systems 被引量:2
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作者 Sohail Taheri Mir Ghoraishi +2 位作者 XIAO Pei CAO Aijun GAO Yonghong 《ZTE Communications》 2016年第4期3-10,共8页
Filter-bank multicarrier (FBMC) with offset quadrature amplitude modulation (OQAM) is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing ... Filter-bank multicarrier (FBMC) with offset quadrature amplitude modulation (OQAM) is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing (OFDM) systems. However, because of or-thogonality in real field and the presence of imaginary intrinsic interference, channel estimation in FBMC is not as straightforward as OFDM systems especially in multiple antenna scenarios. In this paper, we propose a channel estimation method which employs intrinsic interference cancellation at the transmitter side. The simulation results show that this method has less pilot overhead, less peak to average power ratio (PAPR), better bit error rate (BER), and better mean square error (MSE) performance compared to the well-known intrinsic approximation methods (IAM). 展开更多
关键词 channel estimation filter-bank multicarrier (FBMC) multiple-input multiple-output (mimo offset quadrature amplitude modula-tion (OQAM) wireless communication
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Sparse channel estimation for MIMO-OFDM systems using distributed compressed sensing 被引量:1
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作者 刘翼 梅文博 +1 位作者 杜慧茜 汪宏宇 《Journal of Beijing Institute of Technology》 EI CAS 2016年第4期540-546,共7页
A sparse channel estimation method is proposed for doubly selective channels in multiple- input multiple-output ( MIMO ) orthogonal frequency division multiplexing ( OFDM ) systems. Based on the basis expansion mo... A sparse channel estimation method is proposed for doubly selective channels in multiple- input multiple-output ( MIMO ) orthogonal frequency division multiplexing ( OFDM ) systems. Based on the basis expansion model (BEM) of the channel, the joint-sparsity of MIMO-OFDM channels is described. The sparse characteristics enable us to cast the channel estimation as a distributed compressed sensing (DCS) problem. Then, a low complexity DCS-based estimation scheme is designed. Compared with the conventional compressed channel estimators based on the compressed sensing (CS) theory, the DCS-based method has an improved efficiency because it reconstructs the MIMO channels jointly rather than addresses them separately. Furthermore, the group-sparse structure of each single channel is also depicted. To effectively use this additional structure of the sparsity pattern, the DCS algorithm is modified. The modified algorithm can further enhance the estimation performance. Simulation results demonstrate the superiority of our method over fast fading channels in MIMO-OFDM systems. 展开更多
关键词 multiple-input multiple-output orthogonal frequency division multiplexing (mimo-OFDM distributed compressed sensing doubly selective channel group-sparse basis expansionmodel
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MIMO场景下最小误差检测
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作者 许天一 邹辉 《科技创新与应用》 2025年第6期43-47,共5页
该文研究多输入多输出(Multiple-Input Multiple-Output,MIMO)场景下的最小均方误差(MMSE)检测方法,旨在提升无线通信系统中的信号检测性能。通过仿真实验,在不同收发天线配置、发射功率和发送符号数量下,对正交相移键控(QPSK)和正交幅... 该文研究多输入多输出(Multiple-Input Multiple-Output,MIMO)场景下的最小均方误差(MMSE)检测方法,旨在提升无线通信系统中的信号检测性能。通过仿真实验,在不同收发天线配置、发射功率和发送符号数量下,对正交相移键控(QPSK)和正交幅度调制(16QAM)进行性能分析。结果表明,随着信噪比的增加,误码率逐渐降低;增加天线数量可以降低误码率,但需要平衡硬件复杂度与性能。在相同信噪比下,QPSK的误码率低于16QAM,且MMSE-ML联合检测方法优于单独的MMSE检测方法。该研究可为优化MIMO系统中的信号检测方法提供新的视角和参考。 展开更多
关键词 多输入多输出 正交相移键控 正交幅度调制 最小误差检测 最大似然检测
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Toward the Energy Efficiency of Resource Allocation Algorithms for OFDMA Downlink MIMO Systems
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作者 Wei-Chiang Wu 《Journal of Electronic Science and Technology》 CAS CSCD 2019年第4期357-370,共14页
The problem of the simultaneous multi-user resource allocation algorithm in orthogonal frequency division multiple access(OFDMA)based systems has recently attracted significant interest.However,most studies focus on m... The problem of the simultaneous multi-user resource allocation algorithm in orthogonal frequency division multiple access(OFDMA)based systems has recently attracted significant interest.However,most studies focus on maximizing the system throughput and spectral efficiency.As the green radio is essential in 5G and future networks,the energy efficiency becomes the major concern.In this paper,we develop four resource allocation schemes in the downlink OFDMA network and the main focus is on analyzing the energy efficiency of these schemes.Specifically,we employ the advanced multi-antenna technology in a multiple input-multiple output(MIMO)system.The first scheme is based on transmit spatial diversity(TSD),in which the vector channel with the highest gain between the base station(BTS)and specific antenna at the remote terminal(RT)is chosen for transmission.The second scheme further employs spatial multiplexing on the MIMO system to enhance the throughput.The space-division multiple-access(SDMA)scheme assigns single subcarrier simultaneously to RTs with pairwise“nearly orthogonal”spatial signatures.In the fourth scheme,we propose to design the transmit beamformers based on the zero-forcing(ZF)criterion such that the multi-user interference(MUI)is completely removed.We analyze the tradeoff between the throughput and power consumption and compare the performance of these schemes in terms of the energy efficiency. 展开更多
关键词 Energy efficiency multiple input-multiple output(mimo) multi-user resource allocation orthogonal frequency division multiple access(OFDMA) space-division multiple-access(SDMA) spatial multiplexing
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基于MIMO的LPI通信系统优化研究
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作者 张武明 《通信电源技术》 2025年第6期178-180,共3页
文章结合多输入多输出(Multiple Input Multiple Output,MIMO)技术,提出针对低截获概率(Low Probability of Intercept,LPI)通信的传输模式优化、波束成形、功率控制与信道估计等方法,旨在提高系统的抗干扰能力和信号传输效率。仿真结... 文章结合多输入多输出(Multiple Input Multiple Output,MIMO)技术,提出针对低截获概率(Low Probability of Intercept,LPI)通信的传输模式优化、波束成形、功率控制与信道估计等方法,旨在提高系统的抗干扰能力和信号传输效率。仿真结果表明,相较于传统单天线LPI系统,基于MIMO的LPI通信系统在复杂信道环境下实现了显著的性能提升,尤其在高信噪比条件下展现出更好的抗衰落能力和吞吐量。该研究为LPI通信技术的发展提供了新的思路,为未来的无线安全通信等领域提供了技术支持和理论依据。 展开更多
关键词 多输入多输出(mimo) 低截获概率(LPI)通信 信号优化 波束成形 功率控制
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