提出一种电力物资到货管理信息系统。在省级电网公司的企业资源计划(enterprise resource planning,ERP)架构下,基于掌上电脑技术(personal digital assistant,PDA)实现对物资到货的精密管理,信息系统包括催交、配送、现场管理、废旧处...提出一种电力物资到货管理信息系统。在省级电网公司的企业资源计划(enterprise resource planning,ERP)架构下,基于掌上电脑技术(personal digital assistant,PDA)实现对物资到货的精密管理,信息系统包括催交、配送、现场管理、废旧处置等应用功能模块,以及系统平台设计和用户信息管理、权限分配等功能。实践结果表明,该系统切实可行,对于推动物资管理领域管理创新和信息化研究具有重要的参考意义和应用价值。展开更多
This paper considers the design of iterative receivers for space-frequencyblock-coded orthogonal frequency division multiplexing (SFBC-OFDM) systems in unknown wirelessdispersive fading channels. An iterative joint ch...This paper considers the design of iterative receivers for space-frequencyblock-coded orthogonal frequency division multiplexing (SFBC-OFDM) systems in unknown wirelessdispersive fading channels. An iterative joint channel estimation and symbol detection algorithm isderived. In the algorithm, the channel estimator performs alternately in two modes. During thetraining mode, the channel state information (CSI) is obtained by a discrete-Fourier-transform-basedchannel estimator and the noise variance and covariance matrix of the channel response is estimatedby the proposed method. In the data transmission mode, the CSI and transmitted data is obtainediteratively. In order to suppress the error propagation caused by a random error in identifyingsymbols, a simple error propagation detection criterion is proposed and an adaptive training schemeis applied to suppress the error propagation. Both theoretical analysis and simulation results showthat this algorithm gives better bit-error-rate performance and saves the overhead of OFDM systems.展开更多
文摘提出一种电力物资到货管理信息系统。在省级电网公司的企业资源计划(enterprise resource planning,ERP)架构下,基于掌上电脑技术(personal digital assistant,PDA)实现对物资到货的精密管理,信息系统包括催交、配送、现场管理、废旧处置等应用功能模块,以及系统平台设计和用户信息管理、权限分配等功能。实践结果表明,该系统切实可行,对于推动物资管理领域管理创新和信息化研究具有重要的参考意义和应用价值。
文摘This paper considers the design of iterative receivers for space-frequencyblock-coded orthogonal frequency division multiplexing (SFBC-OFDM) systems in unknown wirelessdispersive fading channels. An iterative joint channel estimation and symbol detection algorithm isderived. In the algorithm, the channel estimator performs alternately in two modes. During thetraining mode, the channel state information (CSI) is obtained by a discrete-Fourier-transform-basedchannel estimator and the noise variance and covariance matrix of the channel response is estimatedby the proposed method. In the data transmission mode, the CSI and transmitted data is obtainediteratively. In order to suppress the error propagation caused by a random error in identifyingsymbols, a simple error propagation detection criterion is proposed and an adaptive training schemeis applied to suppress the error propagation. Both theoretical analysis and simulation results showthat this algorithm gives better bit-error-rate performance and saves the overhead of OFDM systems.
