有限控制集模型预测直接功率控制（finite control set model predictive direct power control,FCS-MPDPC）在每个采样周期中仅输出单一离散电压矢量,功率控制精度差,而且需要大量的计算来选择最优电压矢量。针对上述问题,该文在研究...有限控制集模型预测直接功率控制（finite control set model predictive direct power control,FCS-MPDPC）在每个采样周期中仅输出单一离散电压矢量,功率控制精度差,而且需要大量的计算来选择最优电压矢量。针对上述问题,该文在研究脉冲宽度调制（pulse width modulation,PWM）整流器功率预测模型的基础上提出一种基于三矢量的三相PWM整流器低复杂度模型预测直接功率控制（low complexity model predictive direct power control,LC-MPDPC）方法。该方法以同步旋转坐标系下的负共轭复功率作为控制变量,通过计算直接获得目标电压矢量扇区位置;然后采用有功、无功功率误差最小的原则来计算各离散电压矢量作用时间;最后将其转换为开关状态作用于PWM整流器。为了验证所提控制方法的控制效果,与FCS-MPDPC方法进行对比分析,表明该文所提LC-MPDPC方法较FCS-MPDPC具有更好的功率控制精度。展开更多
Existing solutions against wiretapping attacks for network coding either bring significant bandwidth overhead or incur a high computational complexity.In order to reduce the security overhead of the existing solutions...Existing solutions against wiretapping attacks for network coding either bring significant bandwidth overhead or incur a high computational complexity.In order to reduce the security overhead of the existing solutions for securing network coding,a novel securing network coding paradigm is presented relying on two coding models:intra-generation coding and inter-generation coding.The basic idea to secure network coding using intra-generation coding is to limit the encryption operations for each generation,and then subject the scrambled and the remaining original source vectors to a linear transformation.This method is then generalized seamlessly using inter-generation coding by further exploiting the algebraic structure of network coding.We show that the proposed schemes have properties of low-complexity security,little bandwidth consumption,and high efficiency in integrating with the existing security techniques effectively.展开更多
Services provided by internet need guaranteed network performance. Efficient packet queuing and scheduling schemes play key role in achieving this. Internet engineering task force(IETF) has proposed Differentiated Ser...Services provided by internet need guaranteed network performance. Efficient packet queuing and scheduling schemes play key role in achieving this. Internet engineering task force(IETF) has proposed Differentiated Services(Diff Serv) architecture for IP network which is based on classifying packets in to different service classes and scheduling them. Scheduling schemes of today's wireless broadband networks work on service differentiation. In this paper, we present a novel packet queue scheduling algorithm called dynamically weighted low complexity fair queuing(DWLC-FQ) which is an improvement over weighted fair queuing(WFQ) and worstcase fair weighted fair queuing+(WF2Q+). The proposed algorithm incorporates dynamic weight adjustment mechanism to cope with dynamics of data traffic such as burst and overload. It also reduces complexity associated with virtual time update and hence makes it suitable for high speed networks. Simulation results of proposed packet scheduling scheme demonstrate improvement in delay and drop rate performance for constant bit rate and video applications with very little or negligible impact on fairness.展开更多
This paper has developed a measurement approach that integrates price with the product technical content initiated by Lall et al.(2006),i.e.,dividing HS6-quantile products into high-end,middle-end and low-end levels t...This paper has developed a measurement approach that integrates price with the product technical content initiated by Lall et al.(2006),i.e.,dividing HS6-quantile products into high-end,middle-end and low-end levels through the quantile ranking of prices of the same product from different countries or regions in a target market.Our estimation has discovered that due to the lack of product price differentiation,traditional method for the measurement of product technical content overestimated technical content of the low-end segment in the same category of products while underestimated technical content of the high-end segment in the same category of products.Re-calculation based on Rodric's result indicates that specialness of Chinese exports is mainly reflected by high-end and middle-end products.In addition,the competition result of the sophistication of Chinese exports indicates that since the middle of the 1990 s,the sophistication of Chinese exports has remained relatively low compared with the average level of the world and developing countries;from an economic perspective,improvement in the sophistication of Chinese exports primarily derived from middle-end and low-end products;from a category-specific perspective,improvement in the sophistication of Chinese exports primarily derived from low-technology export products.展开更多
Y2001-62960-310 0206505V-BLAST 系统的低复杂性结构=A law complexity ar-chitecture of the V-BLAST system[会,英]/Wai,W.K.& Tsui,C.-Y.//2000 IEEE Wireless Communica-tions and Networking Conference,Vol.1.—310～314(HE)
Y2002-63119-529 0217376通过滤波组和提升方法的双正交子波变换的有效 VL-SI 结构=Efficient VLSI architectures for the biorthogo-nal wavelet transform by filter bank and lifting scheme[会,英]/Jou,J.M.&Shiau,Y.-H.//The ...Y2002-63119-529 0217376通过滤波组和提升方法的双正交子波变换的有效 VL-SI 结构=Efficient VLSI architectures for the biorthogo-nal wavelet transform by filter bank and lifting scheme[会,英]/Jou,J.M.&Shiau,Y.-H.//The IEEE In-ternational Symposium an Circuits and Systems Vol.2 of5.—529～532(HE)展开更多
Y2001-62853-1743 0206374横向复接器的存储截断接收机:Memory truncationreceivers for transmultiplexers[会,英]/Mertins,A.//2000 5<sup>th</sup> International Conference on Signal ProcessingProceedings,Vol.Ⅲ of...Y2001-62853-1743 0206374横向复接器的存储截断接收机:Memory truncationreceivers for transmultiplexers[会,英]/Mertins,A.//2000 5<sup>th</sup> International Conference on Signal ProcessingProceedings,Vol.Ⅲ of Ⅲ.—1743～1749（HE）本文研究了频率选择性信道基于横向复接器数据传输的最佳接收滤波器组的设计,给出基于存储截断原理的新设计策略,而不是均衡,通过接收滤波器,截断每个子信道为一定长度。展开更多
Y2002-63121-438 0219961低复杂性自适应内插 FIR 回声对消器=A low com-plexity adaptive interpolated FIR echo canceller[会,英]/Lin,S.-S.& Wu,W.-R.//The IEEE InternationalSymposium on Circuits and Systems Vol.4 of 5.—...Y2002-63121-438 0219961低复杂性自适应内插 FIR 回声对消器=A low com-plexity adaptive interpolated FIR echo canceller[会,英]/Lin,S.-S.& Wu,W.-R.//The IEEE InternationalSymposium on Circuits and Systems Vol.4 of 5.—438～441(HE)Y2002-53121-450 0219962金属线传输系统自适应混频信号窄带干扰对消器=An adaptive mixed-signal narrowband interference can-celler for wireline transmission systems[会,英]/Mage-sacher,T.& Odling,P.//The IEEE InternationalSymposium on Circuits and Systems Vol.4 of 5.—450～453(HE)展开更多
We propose a low complexity robust beamforming method for the general-rank signal model, to combat against mismatches of the desired signal array response and the received signal covariance matrix. The proposed beamfo...We propose a low complexity robust beamforming method for the general-rank signal model, to combat against mismatches of the desired signal array response and the received signal covariance matrix. The proposed beamformer not only considers the norm bounded uncertainties in the desired and received signal covariance matrices, but also includes an additional positive semidefinite constraint on the desired signal covariance matrix. Based on the worst-case performance optimization criterion, a computationally simple closed-form weight vector is obtained. Simulation results verify the validity and robustness of the proposed beamforming method.展开更多
文摘有限控制集模型预测直接功率控制（finite control set model predictive direct power control,FCS-MPDPC）在每个采样周期中仅输出单一离散电压矢量,功率控制精度差,而且需要大量的计算来选择最优电压矢量。针对上述问题,该文在研究脉冲宽度调制（pulse width modulation,PWM）整流器功率预测模型的基础上提出一种基于三矢量的三相PWM整流器低复杂度模型预测直接功率控制（low complexity model predictive direct power control,LC-MPDPC）方法。该方法以同步旋转坐标系下的负共轭复功率作为控制变量,通过计算直接获得目标电压矢量扇区位置;然后采用有功、无功功率误差最小的原则来计算各离散电压矢量作用时间;最后将其转换为开关状态作用于PWM整流器。为了验证所提控制方法的控制效果,与FCS-MPDPC方法进行对比分析,表明该文所提LC-MPDPC方法较FCS-MPDPC具有更好的功率控制精度。
基金supported by the National Natural Science Foundation of China(Grant No.11371290,No.61271174,No. 61301178)the Science and Technology Innovation Foundation of Xi'an(Grant No. CXY1352WL28)
文摘Existing solutions against wiretapping attacks for network coding either bring significant bandwidth overhead or incur a high computational complexity.In order to reduce the security overhead of the existing solutions for securing network coding,a novel securing network coding paradigm is presented relying on two coding models:intra-generation coding and inter-generation coding.The basic idea to secure network coding using intra-generation coding is to limit the encryption operations for each generation,and then subject the scrambled and the remaining original source vectors to a linear transformation.This method is then generalized seamlessly using inter-generation coding by further exploiting the algebraic structure of network coding.We show that the proposed schemes have properties of low-complexity security,little bandwidth consumption,and high efficiency in integrating with the existing security techniques effectively.
文摘Services provided by internet need guaranteed network performance. Efficient packet queuing and scheduling schemes play key role in achieving this. Internet engineering task force(IETF) has proposed Differentiated Services(Diff Serv) architecture for IP network which is based on classifying packets in to different service classes and scheduling them. Scheduling schemes of today's wireless broadband networks work on service differentiation. In this paper, we present a novel packet queue scheduling algorithm called dynamically weighted low complexity fair queuing(DWLC-FQ) which is an improvement over weighted fair queuing(WFQ) and worstcase fair weighted fair queuing+(WF2Q+). The proposed algorithm incorporates dynamic weight adjustment mechanism to cope with dynamics of data traffic such as burst and overload. It also reduces complexity associated with virtual time update and hence makes it suitable for high speed networks. Simulation results of proposed packet scheduling scheme demonstrate improvement in delay and drop rate performance for constant bit rate and video applications with very little or negligible impact on fairness.
基金an outcome of annual program under the Fundamental Research Funds for the Centrally-Administered Universities(Approval No.JBK130936)Research on the Upgrade Mechanism of Chinese Export Productssponsored by the Fundamental Research Funds for the Centrally-Administered Universitiesa contribution to the Third China Trade Research Group(CTRG) Conference
文摘This paper has developed a measurement approach that integrates price with the product technical content initiated by Lall et al.(2006),i.e.,dividing HS6-quantile products into high-end,middle-end and low-end levels through the quantile ranking of prices of the same product from different countries or regions in a target market.Our estimation has discovered that due to the lack of product price differentiation,traditional method for the measurement of product technical content overestimated technical content of the low-end segment in the same category of products while underestimated technical content of the high-end segment in the same category of products.Re-calculation based on Rodric's result indicates that specialness of Chinese exports is mainly reflected by high-end and middle-end products.In addition,the competition result of the sophistication of Chinese exports indicates that since the middle of the 1990 s,the sophistication of Chinese exports has remained relatively low compared with the average level of the world and developing countries;from an economic perspective,improvement in the sophistication of Chinese exports primarily derived from middle-end and low-end products;from a category-specific perspective,improvement in the sophistication of Chinese exports primarily derived from low-technology export products.
文摘Y2001-62960-310 0206505V-BLAST 系统的低复杂性结构=A law complexity ar-chitecture of the V-BLAST system[会,英]/Wai,W.K.& Tsui,C.-Y.//2000 IEEE Wireless Communica-tions and Networking Conference,Vol.1.—310～314(HE)
文摘Y2002-63119-529 0217376通过滤波组和提升方法的双正交子波变换的有效 VL-SI 结构=Efficient VLSI architectures for the biorthogo-nal wavelet transform by filter bank and lifting scheme[会,英]/Jou,J.M.&Shiau,Y.-H.//The IEEE In-ternational Symposium an Circuits and Systems Vol.2 of5.—529～532(HE)
文摘Y2001-62853-1743 0206374横向复接器的存储截断接收机:Memory truncationreceivers for transmultiplexers[会,英]/Mertins,A.//2000 5<sup>th</sup> International Conference on Signal ProcessingProceedings,Vol.Ⅲ of Ⅲ.—1743～1749（HE）本文研究了频率选择性信道基于横向复接器数据传输的最佳接收滤波器组的设计,给出基于存储截断原理的新设计策略,而不是均衡,通过接收滤波器,截断每个子信道为一定长度。
文摘Y2002-63121-438 0219961低复杂性自适应内插 FIR 回声对消器=A low com-plexity adaptive interpolated FIR echo canceller[会,英]/Lin,S.-S.& Wu,W.-R.//The IEEE InternationalSymposium on Circuits and Systems Vol.4 of 5.—438～441(HE)Y2002-53121-450 0219962金属线传输系统自适应混频信号窄带干扰对消器=An adaptive mixed-signal narrowband interference can-celler for wireline transmission systems[会,英]/Mage-sacher,T.& Odling,P.//The IEEE InternationalSymposium on Circuits and Systems Vol.4 of 5.—450～453(HE)
基金supported by the Fundamental Research Funds for the Central Universities,China(No.K5051202047)
文摘We propose a low complexity robust beamforming method for the general-rank signal model, to combat against mismatches of the desired signal array response and the received signal covariance matrix. The proposed beamformer not only considers the norm bounded uncertainties in the desired and received signal covariance matrices, but also includes an additional positive semidefinite constraint on the desired signal covariance matrix. Based on the worst-case performance optimization criterion, a computationally simple closed-form weight vector is obtained. Simulation results verify the validity and robustness of the proposed beamforming method.
