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A Method for Improving Power Distribution Characteristics of Space Time Block Codes 被引量:3
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作者 Vahid Abbasi Mahrokh GShayesteh 《China Communications》 SCIE CSCD 2020年第6期223-234,共12页
Improving power distribution characteristics of space time block codes(STBCs),namely peak to average power ratio(PAPR),average to minimum power ratio(Ave/min),and probability of transmitting"zero"by antenna,... Improving power distribution characteristics of space time block codes(STBCs),namely peak to average power ratio(PAPR),average to minimum power ratio(Ave/min),and probability of transmitting"zero"by antenna,makes easier their practical implementation.To this end,this study proposes to multiply full diversity STB C with a non-singular matrix in multiple input multiple output(MIMO)or multiple input single output(MISO)systems with linear or maximum likelihood(ML)receivers.It is proved that the obtained code achieves full diversity and the order of detection complexity does not change.The proposed method is applied to different types of STBCs.The bit error rate(BER)and power distribution characteristics of the new codes demonstrate the superiority of the introduced method.Further,lower and upper bounds on the BER of the obtained STBCs are derived for all receivers.The proposed method provides trade-off among PAPR,spectral efficiency,energy efficiency,and BER. 展开更多
关键词 full diversity linear receiver maximum likelihood peak to average power ratio power distribution space time block codes
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Linear Dispersion Orthogonal Space-Time Block Codes
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作者 高明 葛建华 李靖 《Journal of Beijing Institute of Technology》 EI CAS 2010年第3期357-361,共5页
A new architecture of space-time codes as a combination of orthogonal space-time block codes (OSTBC) and linear dispersion codes (LDC) is proposed in order to improve the bit error rate(BER) performance of OSTBC... A new architecture of space-time codes as a combination of orthogonal space-time block codes (OSTBC) and linear dispersion codes (LDC) is proposed in order to improve the bit error rate(BER) performance of OSTBC.The scheme proposed is named linear dispersion orthogonal space-time block codes (LDOSTBC).In LDOSTBC scheme,firstly,the data is coded into LDC codewords.Then,the coded LDC substreams are coded into OSTBC codewords again.The decoding algorithm of LDOSTBC combines linear decoding of OSTBC and ML decoding or suboptimum detection algorithms of LDC.Compared with OSTBC scheme when the rate of LDC is MtR,the performance of LDOSTBC scheme can be improved without decreasing the data rate,where Mt is the number of transmit antennas and R is the spectral efficiency of the modulation constellation.If some rate penalty is allowed,when the rate of LDC is less than MtR the performance of LDOSTBC can be improved further. 展开更多
关键词 space-time coding linear dispersion codes (LDC) orthogonal space-time block codes (OSTBC)
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Closed Loop Space-Time Block Coding for Wireless Downlink Transmission
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作者 李勇朝 廖桂生 王峰 《Journal of Southwest Jiaotong University(English Edition)》 2005年第1期18-22,共5页
In order to improve the poor performance of Space-Time Block Coding (STBC) in a downlink correlated fading environment, a closed loop scheme is proposed. With the known channel fading statistics fed from the receiver,... In order to improve the poor performance of Space-Time Block Coding (STBC) in a downlink correlated fading environment, a closed loop scheme is proposed. With the known channel fading statistics fed from the receiver, eigenbeamforming is utilized to improve the performance of STBC at the transmitter. The new system achieves the array and diversity gain simultaneously. Because reduced dimension processing is adopted, the proposed system has a relative simple structure compared with the traditional beamforming system. The validity of the scheme is verified in several situations by simulation experiments. 展开更多
关键词 space-time block coding Eigenbeamforming Downlink transmission
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Performance of Cross-Layer Design with Power Allocation in Space-Time Coded MIMO Systems
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作者 杨定礼 刘岩 虞湘宾 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2014年第4期431-439,共9页
A cross-layer design(CLD)scheme with combination of power allocation,adaptive modulation(AM)and automatic repeat request(ARQ)is presented for space-time coded MIMO system under imperfect feedback,and the corresponding... A cross-layer design(CLD)scheme with combination of power allocation,adaptive modulation(AM)and automatic repeat request(ARQ)is presented for space-time coded MIMO system under imperfect feedback,and the corresponding system performance is investigated in a Rayleigh fading channel.Based on imperfect feedback information,a suboptimal power allocation(PA)scheme is derived to maximize the average spectral efficiency(SE)of the system.The scheme is based on a so-called compressed SNR criterion,and has a closed-form expression for positive power allocation,thus being computationally efficient.Moreover,it can improve SE of the presented CLD.Besides,due to better approximation,it obtains the performance close to the existing optimal approach which requires numerical search.Simulation results show that the proposed CLD with PA can achieve higher SE than the conventional CLD with equal power allocation scheme,and has almost the same performance as CLD with optimal PA.However,it has lower calculation complexity. 展开更多
关键词 cross-layer design(CLD) power allocation(PA) space-time coding spectral efficiency(SE) packet error rate(PER)
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Optimal transmissions for space-time coded OFDM UWB systems
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作者 WANG Jun-fang ZHU Guang-xi JIN Jiang 《通信学报》 EI CSCD 北大核心 2005年第10期29-33,共5页
The emerging ultra-wideband (UWB) system offers a great potential for the design of high-speed short-range communications.Compared with great progress at physical layer,the corresponding medium access control (MAC) la... The emerging ultra-wideband (UWB) system offers a great potential for the design of high-speed short-range communications.Compared with great progress at physical layer,the corresponding medium access control (MAC) layer designs are naturally placed on the schedules.We focus on the optimal power load scheme,which is an integral part of the MAC layer protocol design,for UWB space-time coded (STC) orthogonal frequency-division multiplexing (OFDM) transmissions.Assumed the transmitter has perfect or partial channel stage information (CSI).Based on the optimization criteria of maximizing capacity,three kinds of power load schemes were presented with different tradeoff among performance,complexity and feedback bandwidth overhead.The proposed schemes are verified and compared under the channel prototype proposed by IEEE 802.15.3a Task Group. 展开更多
关键词 UWB系统 传输模式 时空编码 多路技术 OFDM 媒介访问控制
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阵列雷达时空多维域编码抗主瓣转发式欺骗干扰方法
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作者 兰岚 张翔 +1 位作者 许京伟 廖桂生 《雷达学报(中英文)》 北大核心 2025年第2期439-455,共17页
随着电子技术的快速发展,雷达面临的电磁环境日益复杂。当存在主瓣有源欺骗干扰时,传统相控阵雷达自适应波束形成抗干扰失效,主瓣干扰抑制已成为雷达领域亟待解决的共性难题。该文针对来自主瓣的自卫式转发干扰,提出了一种时空多维域编... 随着电子技术的快速发展,雷达面临的电磁环境日益复杂。当存在主瓣有源欺骗干扰时,传统相控阵雷达自适应波束形成抗干扰失效,主瓣干扰抑制已成为雷达领域亟待解决的共性难题。该文针对来自主瓣的自卫式转发干扰,提出了一种时空多维域编码抗主瓣欺骗式干扰方法。首先,设计发射通道-脉冲-子脉冲编码,在接收端采用多普勒分多址方法实现了发射信号分离。针对目标高速运动导致的分离错位现象,提出一种基于波束形成能量差的移位数估计方法。随后,利用目标与干扰的延时相位差,设计收发联合的双重编码相位补偿方法,在发射空间频率域实现对真实目标、跨脉冲转发干扰、脉内转发干扰的区分,并且通过构建联合发射-接收权矢量,对主瓣欺骗式干扰进行空域滤波抑制。针对实际中波达角度(DOA)误差造成的抗干扰性能下降问题,构建了以最大化输出信干噪比(SINR)为目标函数的约束优化问题,基于交替迭代算法对接收权矢量,发射编码系数、接收编码系数分别进行优化。仿真实验验证了所提方法相比于其他雷达体制在抗主瓣欺骗干扰方面的有效性,其中相比于传统MIMO雷达,所提阵列时空多维域编码技术在4个主瓣干扰存在的情况下SINR可提升34 dB。 展开更多
关键词 阵列雷达 主瓣欺骗干扰抑制 时空多维域编码 DOA误差 收发联合优化
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服务机器人智能空间中QR Code人工地标的设计、定位与识读 被引量:6
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作者 李国栋 田国会 +2 位作者 王洪君 周风余 吴皓 《高技术通讯》 CAS CSCD 北大核心 2013年第12期1275-1283,共9页
研究了服务机器人智能空间中QR Code人工地标的设计、定位与视觉伺服识读问题。首先设计了一种基于QR Code技术的新型人工地标,并利用世界平面的单应分解方法得到了机器人上所搭载摄像机相对人工地标坐标系的位置和姿态信息,然后建立了... 研究了服务机器人智能空间中QR Code人工地标的设计、定位与视觉伺服识读问题。首先设计了一种基于QR Code技术的新型人工地标,并利用世界平面的单应分解方法得到了机器人上所搭载摄像机相对人工地标坐标系的位置和姿态信息,然后建立了移动机器人的运动学模型,并采用一种令机器人作纯旋转运动的简便方法实现了机载摄像机坐标系相对移动机器人坐标系的外参数的标定,最后设计了基于位置的视觉伺服识读算法来控制移动机器人完成对QR Code内存储的丰富信息的读取。实验结果表明,该人工地标识别距离远,定位精度高,且所设计的识读算法简单有效。 展开更多
关键词 视觉伺服 外参数标定 QR CODE 服务机器人智能空间
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采用改进编码遗传算法的空间桁架阻尼杆配置优化
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作者 董治成 苗雪阳 +3 位作者 张梅升 姜东 张大海 费庆国 《宇航学报》 北大核心 2025年第1期181-192,共12页
为最大化发挥阻尼杆在桁架减振中的作用,提出一种改进编码方式,依据桁架结构中杆的位置编码,改进了基本遗传算法的相关流程。进一步针对某实际空间桁架结构建立隔振器的力学模型,并以此建立安有隔振器的阻尼杆的等效力学模型和安有阻尼... 为最大化发挥阻尼杆在桁架减振中的作用,提出一种改进编码方式,依据桁架结构中杆的位置编码,改进了基本遗传算法的相关流程。进一步针对某实际空间桁架结构建立隔振器的力学模型,并以此建立安有隔振器的阻尼杆的等效力学模型和安有阻尼杆的空间桁架结构动力学模型。最后针对两种空间桁架模型,以最大化阻尼杆的减振效果为原则,利用仿真模型开展动力学响应求解和基于改进编码遗传算法的阻尼杆配置优化。结果显示,优化后目标位置的振幅均衰减80%以上,好于优化前的结果,并且算法相较于采用二进制编码的基本遗传算法,收敛速度和稳定性均得到提升。 展开更多
关键词 空间桁架 阻尼杆 改进编码 遗传算法 配置优化
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SPACE-R意外掉落事故的临界安全分析 被引量:7
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作者 刘黎丽 孙征 付子明 《原子能科学技术》 EI CAS CSCD 北大核心 2015年第9期1624-1628,共5页
当空间热离子反应堆发生意外掉落事故时,必须采取反应性控制措施保证反应堆处于次临界状态。SPACE-R是设计目标为40kWe、10a寿命的空间核反应堆。适合SPACE-R意外掉落事故的反应性控制方案有:在燃料空腔内加入控制材料及在慢化剂中放入... 当空间热离子反应堆发生意外掉落事故时,必须采取反应性控制措施保证反应堆处于次临界状态。SPACE-R是设计目标为40kWe、10a寿命的空间核反应堆。适合SPACE-R意外掉落事故的反应性控制方案有:在燃料空腔内加入控制材料及在慢化剂中放入可燃毒物棒。利用MCNP程序分别对两种方案下反应堆的反应性进行计算,可知两种方案均对SPACE-R在意外掉落事故下的反应性有一定的改善。经综合考虑得出一个最终设计方案,能满足意外掉落事故的临界安全验收准则。 展开更多
关键词 space-R 意外掉落事故 临界安全 反应性控制 MCNP程序
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Ray-space数据片内和片间相关性压缩分析
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作者 邵枫 蒋刚毅 +1 位作者 郁梅 陈偕雄 《光电工程》 EI CAS CSCD 北大核心 2006年第2期85-89,共5页
Ray-space数据特征分析表明,其片内和片间均存在很大相关性,并且其数据有明显的方向性特征。通过最优宏块分割、不同精度的块匹配和多参考片预测结果分析,讨论了适合Ray-space数据特点的片内和片间预测技术。与传统的只利用片内相关性... Ray-space数据特征分析表明,其片内和片间均存在很大相关性,并且其数据有明显的方向性特征。通过最优宏块分割、不同精度的块匹配和多参考片预测结果分析,讨论了适合Ray-space数据特点的片内和片间预测技术。与传统的只利用片内相关性的压缩技术相比,利用上述两类相关性,并结合Ray-space数据方向性特征,能进一步提高编码压缩效率。在获得相同重建图像质量下,可使基于H.264的Ray-space压缩方法比基于H.263的方法在码率上节省50%,比JPEG的方法节省75%左右。 展开更多
关键词 Ray—space 片内相关 片间相关 编码效率
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基于实数融合的全国化数据流通基础设施体系思考
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作者 李林 任伏虎 +4 位作者 蔡华谦 董锦华 李春光 叶自燊 金华松 《信息通信技术与政策》 2025年第4期15-27,共13页
梳理数据要素的相关概念,提炼出“虚拟形态、无限复制、集合赋能”三大基础特性;从全局和单次视角剖析数据流通过程,提出数据要素价值由实体需求场景决定和“数据价值=单次低价×多次复用”理念;从“时空”维度分析其对于数据要素... 梳理数据要素的相关概念,提炼出“虚拟形态、无限复制、集合赋能”三大基础特性;从全局和单次视角剖析数据流通过程,提出数据要素价值由实体需求场景决定和“数据价值=单次低价×多次复用”理念;从“时空”维度分析其对于数据要素内容及数据流通的独特意义,这在现实宏观环境下尤显重要。在此基础上,提出基于实数融合的“全局性源头确权+全量流通图谱”破局思路,并综合考虑地方政府的数据收益诉求,针对全国化数据流通基础设施体系建设这一当前焦点问题提出具体对策建议。 展开更多
关键词 数据流通 数据基础设施 实数融合 可信数据空间 时空编码
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自然资源和不动产实体构建方法及应用
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作者 李石波 胡在凰 +2 位作者 陶风 张文强 黄闯 《城市勘测》 2025年第1期142-147,共6页
为进一步提高不动产立体化、精细化管理水平,结合实景三维技术,采用“空间联合”和“参数化建模”方法开展自然资源和不动产实体的二三维实体生产,并基于改进扩展域的不动产实体空间身份编码进行语义化关联和多源数据融合,构建了“地-房... 为进一步提高不动产立体化、精细化管理水平,结合实景三维技术,采用“空间联合”和“参数化建模”方法开展自然资源和不动产实体的二三维实体生产,并基于改进扩展域的不动产实体空间身份编码进行语义化关联和多源数据融合,构建了“地-房-人-权”多维信息时空关联,拓展了不动产信息的应用场景,形成了自然资源登记单元和不动产实体分级分类、空间身份编码规则、二三维实体生产工艺流程、二三维一体化数据库标准等一系列研究成果。以试点区域为例,分析了该技术在不动产登记、城市规划和土地管理等方面的实际应用,以期为实景三维不动产实体建设提供参考。 展开更多
关键词 实景三维 自然资源登记单元实体 不动产实体 语义关联 空间身份编码
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Multi-party dense coding in non-symmetric quantum channel 被引量:2
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作者 付长宝 夏岩 张寿 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第8期1682-1685,共4页
A three- and an (N+ 1)-party dense coding scheme in the case of non-symmetric Hilbert spaces of the particles of a quantum channel are investigated by using a multipartite entangled state. In the case of the (N ... A three- and an (N+ 1)-party dense coding scheme in the case of non-symmetric Hilbert spaces of the particles of a quantum channel are investigated by using a multipartite entangled state. In the case of the (N + 1)-party dense coding scheme, we show that the amount of classical information transmitted from N senders to one receiver is improved. 展开更多
关键词 non-symmetric Hilbert space dense coding unitary transformation
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支持合并的自适应tile coding算法
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作者 施梦宇 刘全 傅启明 《通信学报》 EI CSCD 北大核心 2015年第2期186-192,共7页
针对自适应tile coding算法会产生多余划分的问题,提出一种支持合并的自适应tile coding算法——MATC。该算法能够消除传统自适应tile coding算法中产生的多余划分,进一步解决连续状态空间离散化的问题。将MATC算法应用于离散动作连续... 针对自适应tile coding算法会产生多余划分的问题,提出一种支持合并的自适应tile coding算法——MATC。该算法能够消除传统自适应tile coding算法中产生的多余划分,进一步解决连续状态空间离散化的问题。将MATC算法应用于离散动作连续状态的Mountain Car问题上,实验结果表明,该算法在学习过程中能消除传统tile coding算法的误划分所产生的不良影响,更准确地自动调整划分的精度,并更快地收敛到最佳策略。 展开更多
关键词 连续空间 离散化 强化学习 自适应 TILE coding
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Design and Implementation of Verification Code Identification Based on Anisotropic Heat Kernel 被引量:2
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作者 LIU Lizhao LIU Jian +3 位作者 DAI Yaomei XU Huarong YIN Huayi ZHU Shunzhi 《China Communications》 SCIE CSCD 2016年第1期100-112,共13页
Many websites use verification codes to prevent users from using the machine automatically to register,login,malicious vote or irrigate but it brought great burden to the enterprises involved in internet marketing as ... Many websites use verification codes to prevent users from using the machine automatically to register,login,malicious vote or irrigate but it brought great burden to the enterprises involved in internet marketing as entering the verification code manually.Improving the verification code security system needs the identification method as the corresponding testing system.We propose an anisotropic heat kernel equation group which can generate a heat source scale space during the kernel evolution based on infinite heat source axiom,design a multi-step anisotropic verification code identification algorithm which includes core procedure of building anisotropic heat kernel,settingwave energy information parameters,combing outverification codccharacters and corresponding peripheral procedure of gray scaling,binarizing,denoising,normalizing,segmenting and identifying,give out the detail criterion and parameter set.Actual test show the anisotropic heat kernel identification algorithm can be used on many kinds of verification code including text characters,mathematical,Chinese,voice,3D,programming,video,advertising,it has a higher rate of 25%and 50%than neural network and context matching algorithm separately for Yahoo site,49%and 60%for Captcha site,20%and 52%for Baidu site,60%and 65%for 3DTakers site,40%,and 51%.for MDP site. 展开更多
关键词 verification code image recognition data mining scale space anisotropic heat kernel
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LDPC Coding Scheme for Improving the Reliability of Multi-Level-Cell NAND Flash Memory in Radiation Environments 被引量:2
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作者 Guangjun Ge Liuguo Yin 《China Communications》 SCIE CSCD 2017年第8期10-21,共12页
Utilizing commercial off-the-shelf(COTS) components in satellites has received much attention due to the low cost. However, commercial memories suffer severe reliability problems in radiation environments. This paper ... Utilizing commercial off-the-shelf(COTS) components in satellites has received much attention due to the low cost. However, commercial memories suffer severe reliability problems in radiation environments. This paper studies the low-density parity-check(LDPC) coding scheme for improving the reliability of multi-level-cell(MLC) NAND Flash memory in radiation environments. Firstly, based on existing physical experiment works, we introduce a new error model for heavyion irradiations; secondly, we explore the optimization of writing voltage allocation to maximize the capacity of the storage channel; thirdly, we design the degree distribution of LDPC codes that is specially suitable for the proposed model; finally, we propose a joint detection-decoding scheme based on LDPC codes, which estimates the storage channel state and executes an adaptive log-likelihood ratio(LLR) calculation to achieve better performance. Simulation results show that, compared with the conventional LDPC coding scheme, the proposed scheme may almost double the lifetime of the MLC NAND Flash memory in radiation environments. 展开更多
关键词 low-density parity-check(LDPC) coding multi-level-cell(MLC) NAND Flash memory joint detection-decoding commercial off-the-shelf(COTS) components space radiation environments
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An image compression method for space multispectral time delay and integration charge coupled device camera
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作者 李进 金龙旭 张然峰 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第6期360-365,共6页
Multispectral time delay and integration charge coupled device (TDICCD) image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Cons... Multispectral time delay and integration charge coupled device (TDICCD) image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Consultative Committee for Space Data Systems (CCSDS) has proposed an image data compression (CCSDS-IDC) algorithm which is so far most widely implemented in hardware. However, it cannot reduce spectral redundancy in mukispectral images. In this paper, we propose a low-complexity improved CCSDS-IDC (ICCSDS-IDC)-based distributed source coding (DSC) scheme for multispectral TDICCD image consisting of a few bands. Our scheme is based on an ICCSDS-IDC approach that uses a bit plane extractor to parse the differences in the original image and its wavelet transformed coefficient. The output of bit plane extractor will be encoded by a first order entropy coder. Low-density parity-check-based Slepian-Wolf (SW) coder is adopted to implement the DSC strategy. Experimental results on space multispectral TDICCD images show that the proposed scheme significantly outperforms the CCSDS-IDC-based coder in each band. 展开更多
关键词 multispectral CCD images Consultative Committee for space Data Systems - image data compression (CCSDS-IDC) distributed source coding (DSC)
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An MMSE Decoding Algorithm without Matrix Inversion in QSTBC 被引量:1
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作者 刘于 何子述 《Journal of Electronic Science and Technology of China》 2005年第4期325-327,共3页
The matrix inversion operation is needed in the MMSE decoding algorithm of orthogonal space-time block coding (OSTBC) proposed by Papadias and Foschini. In this paper, an minimum mean square error (MMSE) decoding ... The matrix inversion operation is needed in the MMSE decoding algorithm of orthogonal space-time block coding (OSTBC) proposed by Papadias and Foschini. In this paper, an minimum mean square error (MMSE) decoding algorithm without matrix inversion is proposed, by which the computational complexity can be reduced directly but the decoding performance is not affected. 展开更多
关键词 quasi-orthogonal space-time block coding (QSTBC) multiple input multiple output (MIMO) channel minimum mean square error (MMSE) decoding algorithm
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A Low Complexity Decoding Algorithm for STBC under Non-Constant Module Modulation
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作者 李可 唐斌 杨建宇 《Journal of Electronic Science and Technology of China》 2005年第3期199-202,共4页
This paper presents a low complexity algorithm for the decoding of space-time block codes (STBC) under non-constant module modulation. Simulation results show that in most cases of non-constant module modulation the... This paper presents a low complexity algorithm for the decoding of space-time block codes (STBC) under non-constant module modulation. Simulation results show that in most cases of non-constant module modulation the new algorithm results in more than 50% reduction in computation complexity comparing to the original maximum likelihood algorithm without any loss of BER performance. 展开更多
关键词 space-time block codes DEcoding wireless communications
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基于D2D通信和虚拟MIMO的飞行器集群网络传输方案设计
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作者 刘志峰 张雪 +4 位作者 栗苹 张继豪 李思琪 王卫东 龚鹏 《兵工学报》 EI CAS CSCD 北大核心 2024年第4期1141-1147,共7页
在无中心飞行器集群网络中,非直通条件节点间不同的中继路径可能导致较大路径损耗落差,为有限资源前提下网络传输能力的提升带来困难。参考5G移动通信中的终端直通(Device to Device,D2D)技术与中继通信中的虚拟多输入多输出(Multiple-I... 在无中心飞行器集群网络中,非直通条件节点间不同的中继路径可能导致较大路径损耗落差,为有限资源前提下网络传输能力的提升带来困难。参考5G移动通信中的终端直通(Device to Device,D2D)技术与中继通信中的虚拟多输入多输出(Multiple-Input Multiple-Output,MIMO)技术,提出一套D2D通信与虚拟MIMO技术结合的无中心飞行器集群网络传输方案。重点研究在正交资源模式下,将不同的协作传输协议与空时编码进行组合,在信噪比、误比特率、接入概率等方面对通信性能的影响。仿真结果表明:D2D通信与虚拟MIMO技术结合的传输方案在不增加资源的前提下,对集群网络的通信性能有明显提升,且引入分布式空时编码可进一步优化误比特率性能,但3种传输协议在不同传输质量评价方向的改善有所不同。 展开更多
关键词 飞行器集群网络 终端直通通信 虚拟多输入多输出 协作传输协议 空时编码
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