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智能电网中低压载波通信信道模型构建
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作者 刘俊萍 《通信电源技术》 2023年第23期198-200,共3页
由于现有的信道模型衰减指数不在标准范围内,信号传输结果不符合预期,提出构建智能电网中低压载波通信信道模型。首先,对无线通信模型进行校正优化处理,增加信息网络的覆盖程度,以完成对通信信道的校正。其次,消除输电线路中的信道干扰... 由于现有的信道模型衰减指数不在标准范围内,信号传输结果不符合预期,提出构建智能电网中低压载波通信信道模型。首先,对无线通信模型进行校正优化处理,增加信息网络的覆盖程度,以完成对通信信道的校正。其次,消除输电线路中的信道干扰噪声,将白噪声和窄带干扰进行叠合,观察信道频谱中低压输电线路信道的衰落特征,以减少信号在低压输电线路中的传输距离。最后,将信道功率的分布限制在规定的频率变化范围内,避免低频段传输特性受到负载变化的影响,并运用传递函数来描述其传输特性,从而完成模型构建。实验结果表明,8个小组的信道模型衰减指数均在-50~40 dB,传输结果符合预期,能够根据低压电力传输线衰减信号耦合电路参数,提高传输速率。 展开更多
关键词 智能电网 载波通信 通信信道模型 白噪声
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一种基于通信信道容量的多级安全模型 被引量:6
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作者 刘雄 卓雪君 +1 位作者 汤永利 戴一奇 《电子学报》 EI CAS CSCD 北大核心 2010年第10期2460-2464,共5页
安全模型有多种代表模型,如BLP模型和不可推断模型等.这些模型在理论描述或者实际应用方面存在一定的局限性,如BLP模型未能考虑隐蔽通道,不可推断模型不适应非确定系统.针对这些模型的不足,本文在BLP模型基础上,考虑了隐蔽通道的特性,... 安全模型有多种代表模型,如BLP模型和不可推断模型等.这些模型在理论描述或者实际应用方面存在一定的局限性,如BLP模型未能考虑隐蔽通道,不可推断模型不适应非确定系统.针对这些模型的不足,本文在BLP模型基础上,考虑了隐蔽通道的特性,提出了泄密通道有限容忍的通信信道模型,该模型能通过调节泄密通道信道容量上限来平衡实际系统可用性和安全性. 展开更多
关键词 安全模型 BLP模型 隐蔽通道 通信信道模型
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Coding Scheme for Ka-Band Fixed Satellite Communication System 被引量:4
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作者 王爱华 罗伟雄 《Journal of Beijing Institute of Technology》 EI CAS 2002年第2期169-173,共5页
The performance analysis and simulation of coding schemes based on the modeling Ka band fixed satellite channel have been presented. The results indicate that concatenated codes with large inner interleaving depth ha... The performance analysis and simulation of coding schemes based on the modeling Ka band fixed satellite channel have been presented. The results indicate that concatenated codes with large inner interleaving depth have good performance and high spectrum efficiency. The studies also show that simple block interleaving is very effective in combating the slow frequency nonselective fading of Ka band. 展开更多
关键词 Ka band channel model performance simulation coding scheme
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Simulation Study and Probe on UWB Wireless Communication in Underground Coal Mine 被引量:8
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作者 WANG Yan-fen WANG Zheng-gang YU Hong-zhen 《Journal of China University of Mining and Technology》 EI 2006年第3期296-300,共5页
From an analysis of the status of coal mine underground wireless communication, the application of UWB wireless communication system to underground coal mine is proposed. The basic composition of an UWB communication ... From an analysis of the status of coal mine underground wireless communication, the application of UWB wireless communication system to underground coal mine is proposed. The basic composition of an UWB communication system and application in underground coal mines are introduced. The analyses show that, because of the transmission power being non-limitted in underground coal mines, the use of UWB in coal mines cannot only realize wireless access services of short distance high rate application for transmission of video monitoring signals, but also realize wireless access services of long distance low rate applications for mobile telephones in underground coal mines and parameters of working conditions monitoring, etc. It is emphasized on the simulation of a TH-PPM UWB communication system with traditional underground broadband model and ground CM1, CM3 model. It is shown that the traditional underground broadband model and ground CM1, CM3 models are not applicable to the UWB communication system in underground coal mines. It is necessary to conduct research on the propagation characteristics of UWB in coal mine tunnels, given the characteristics of the underground environment and to find the appropriate UWB model for underground coal mines. 展开更多
关键词 ultra-wide band system simulation underground coal mine channel model characteristic of propagation.
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Stationarity Intervals of Time-Variant Channel in High Speed Railway Scenario 被引量:15
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作者 Chen Binghao Zhong Zhangdui Ai Bo 《China Communications》 SCIE CSCD 2012年第8期64-70,共7页
The non-stationary behavior, caused by the train rmverrent, is the rmin factor for the variation of high speed railway channel. To measure the tirce-variant effect, the parameter of stationarity interval, in which the... The non-stationary behavior, caused by the train rmverrent, is the rmin factor for the variation of high speed railway channel. To measure the tirce-variant effect, the parameter of stationarity interval, in which the channel keeps constant or has no great change, is adopted based on Zhengzfiou- Xi'an (Zhengxi) passenger dedicated line measurement with different train speeds. The stationarity interval is calculated through the definition of Local Region of Stationarity (LRS) under three train ve- locities. Furthermore, the time non-stationary characteristic of high speed pared with five standard railway channel is corn- Multiple-Input MultipleOutput (MIMO) channel models, i.e. Spatial Channel Model (SCM), extended version of SCM (SCME), Wireless World Initiative New Radio Phase II (WINNERII), International Mobile Teleconmnications-Advanced (IMT-Advanced) and WiMAX models which contain the high speed moving scenario. The stationarity interval of real channel is 9 ms in 80% of the cases, which is shorter than those of the standard models. Hence the real channel of high speed railway changes more rapidly. The stationarity intervals of standard models are different due to different modeling methods and scenario def- initions. And the compared results are instructive for wireless system design in high speed railway. 展开更多
关键词 channel characterization time-variantcharacteristic stationarity interval high speed railway standard MIMO channel model
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Polarization Projection for 3D Geometry-Based Stochastic Channel Model
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作者 PANG Lihua ZHANG Yang +5 位作者 GONG Fengkui WANG Anyi XIAO Liyuan LIANG Xiao WANG Qiaofeng LI Jiandong 《China Communications》 SCIE CSCD 2015年第10期52-63,共12页
Comprehensive radiation characteristics of polarized antenna are crucial in creating practical channel coefficients for next generation wireless communication system designs.Being currently supported within3 D geometr... Comprehensive radiation characteristics of polarized antenna are crucial in creating practical channel coefficients for next generation wireless communication system designs.Being currently supported within3 D geometry-based stochastic channel models(GSCM),field patterns are technically obtained by chamber measurement(or by its best fitting).However,in some channel related performance analysis scenarios,design insight can be crystallized better by starting the derivations with theoretical co-polarization and cross-polarization components.Specifically,these two components are mathematically linked with field patterns through the proposed polarization projection algorithm.In this manuscript,we focus on revealing the transformation criterion of polarization states between the antenna plane and the propagation plane.In practice,it makes retrieving the field patterns by electromagnetic computation possible.Meanwhile,the impact imposed by distinct antenna orientations is geometrically illustrated and consequently incorporated into the proposed algorithm.This will further facilitate flexible performance evaluation of related radio transmission technologies.Our conclusions are verified by the closed-form expression of the dipole field pattern(via an analytical approach) and by chamber measurement results.Moreover,we find that its 2D degenerative case is aligned with the definitions in 3^(rd) generation partnership project(3GPP)technical report 25.996.The most obvious benefit of the proposed algorithm is to significantly reduce the cost on generating channel coefficients in GSCM simulation. 展开更多
关键词 polarization 3D geometry-based stochastic channel model antenna orientation radiation characteristics dipole chamber measurement channel simulation
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