期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
相位平均网络理论及实验的初步探讨
1
作者 石爱民 《光通信技术》 CSCD 1989年第1期39-48,共10页
相位平均网络是一种能把多个有相位抖动的脉冲进行相位平均,得到一种特殊脉冲信号的网络。本文对相位平均网络进行了理论分析及实验,并对实验结果进行了分析。
关键词 网络 脉冲波形 相位传递函数 最大时间差 触发器
下载PDF
封面人物
2
《科学中国人》 1999年第5期3-3,共1页
夏培肃 女 计算机专家,1923年7月28日生于四川重庆(原籍四川江津),1945年毕业于中央大学电机系,1950年在英国爱丁堡大学莸博士学位。中国科学院计算技术研究所研究员。1991年当选为中国科学院院士(学部委员)。50年代设计试制成功中国第... 夏培肃 女 计算机专家,1923年7月28日生于四川重庆(原籍四川江津),1945年毕业于中央大学电机系,1950年在英国爱丁堡大学莸博士学位。中国科学院计算技术研究所研究员。1991年当选为中国科学院院士(学部委员)。50年代设计试制成功中国第一台自行设计的通用电子数字计算机。 展开更多
关键词 通用电子数字计算机 高速计算机 中国科学院院士 计算技术研究所 并行计算机 设计研制 学部委员 计算机专家 最大时间差 阵列处理机
下载PDF
Space-time spreading and space-time coding for correlated frequency-selective channel in the presence of interference 被引量:2
3
作者 肖海林 Nie Zaiping Li Xin 《High Technology Letters》 EI CAS 2008年第1期81-84,共4页
The space-time spreading (SIS), superimposed training sequences and space-time coding (STC) are adopted to obtain a closed-form of average error probability upper bound and maximum likelihood esti- mation expressi... The space-time spreading (SIS), superimposed training sequences and space-time coding (STC) are adopted to obtain a closed-form of average error probability upper bound and maximum likelihood esti- mation expression for multiple input and multiple output (MIMO) correlated frequency-selective channel in the presence of interference (colored interference). Moreover, the correlation at both ends of the wire- less link that can be incorporated equivalently into correlation at the transmit end is derived. Finally, the mean square error (MSE) of the maximum likelihood estimate is also derived. 展开更多
关键词 average error probability upper bound Chemoff bound maximum likelihood estimation space-time spreading (SIS) space-time coding (STC) mean square error
下载PDF
TDOA Localization Algorithm with Compensation of Clock Offset for Wireless Sensor Networks 被引量:9
4
作者 XIONG Hui CHEN Zhiyuan +1 位作者 YANG Beiya NI Rongpei 《China Communications》 SCIE CSCD 2015年第10期193-201,共9页
This paper presents a source localization algorithm based on the source signal's time-difference-of-arrival(TDOA) for asynchronous wireless sensor network.To obtain synchronization among anchors,all anchors broadc... This paper presents a source localization algorithm based on the source signal's time-difference-of-arrival(TDOA) for asynchronous wireless sensor network.To obtain synchronization among anchors,all anchors broadcast signals periodically,the clock offsets and skews of anchor pairs can be estimated using broadcasting signal's time-of-arrivals(TOA) at anchors.A kalman filter is adopted to improve the accuracy of clock offsets and track the clock drifts due to random fluctuations.Once the source transmits signal,the TOAs at anchors are stamped respectively and source's TDOA error due to clock offset and skew of anchor pair can be mitigated by a compensation operation.Based on a Gaussian noise model,maximum likelihood estimation(MLE) for the source position is obtained.Performance issues are addressed by evaluating the Cramer-Rao lower bound and the selection of broadcasting period.The proposed algorithm is simple and effective,which has close performance with synchronous TDOA algorithm. 展开更多
关键词 wireless sensor network asynchronous sensors Kalman filter localiza-tion time-difference-of-arrival(TDOA) time-of-arrival(TOA) clock offset and skew estimation
下载PDF
Maximum Likelihood Estimation of Clock Synchronization Error in OFDM System
5
作者 崔小准 胡光锐 陈豪 《Journal of Donghua University(English Edition)》 EI CAS 2004年第4期1-3,共3页
The performance degradation of an orthogonal frequency division multiplexing (OFDM) systems due to clock synchronization error is analyzed and a pilot-aided maximum likelihood (ML) estimating method is proposed to cor... The performance degradation of an orthogonal frequency division multiplexing (OFDM) systems due to clock synchronization error is analyzed and a pilot-aided maximum likelihood (ML) estimating method is proposed to correct it. The proposed algorithm enables clock synchronization error estimation from a pilot whose duration is only two symbol periods. The study shows that this method is simple and exact. The clock synchronization error can be corrected almost entirely. 展开更多
关键词 Orthogonal frequency-division multiplexing clock synchronization error maximum likelihood estimator
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部