基于非共享策略,围绕着降低系统反应延迟与通信负荷的目标,提出了一种分两阶段渐进求解的分布式算法BOCS(based on the change of skyline),并对算法的关键实现环节,如协调站点与远程站点间的通信、skyline增量的计算等进行了系统优化,...基于非共享策略,围绕着降低系统反应延迟与通信负荷的目标,提出了一种分两阶段渐进求解的分布式算法BOCS(based on the change of skyline),并对算法的关键实现环节,如协调站点与远程站点间的通信、skyline增量的计算等进行了系统优化,使算法在通信负荷与反应延迟上达到了较好的综合性能.理论分析证明,在所有基于非共享策略的算法中,BOCS算法通信最优.大量的对比实验结果也表明,所提出的算法高效、稳定且具有良好的可扩展性.展开更多
针对无线传感网中分簇及路由过程中节点能量利用率较低、网络能耗不均衡以及网络的生命周期较短等问题,面向多Sink模式下的具有随机异构性能的传感器网络,为解决该问题,提出了一种基于随机多Sink模式下的异构网络组织策略NAHN(Networkin...针对无线传感网中分簇及路由过程中节点能量利用率较低、网络能耗不均衡以及网络的生命周期较短等问题,面向多Sink模式下的具有随机异构性能的传感器网络,为解决该问题,提出了一种基于随机多Sink模式下的异构网络组织策略NAHN(Networking Algorithm for Random Muti-Sink Heterogeneous Networks)。异构节点以自身能量、可达节点集、平均邻居节点距离以及距离信号集为簇首选举标准,提出了基于多Sink模式下的权值匹配策略,优化簇首能耗;以簇首单次中转损耗的能量为门限,综合考虑自身能量以及多Sink模式下距离信号集的影响,搭建出一条最优的通信链路,在保证链路质量的同时优化路由过程中的簇首节点的能量损耗。在与其他3种多Sink异构网络改进的路由算法的性能比较实验中,NAHR算法在提高节点能量利用率、延缓节点死亡、延长且稳定网络寿命等方面,优势均较为明显。展开更多
In oil and mineral exploration, gravity gradient tensor data include higher- frequency signals than gravity data, which can be used to delineate small-scale anomalies. However, full-tensor gradiometry （FTG） data are...In oil and mineral exploration, gravity gradient tensor data include higher- frequency signals than gravity data, which can be used to delineate small-scale anomalies. However, full-tensor gradiometry （FTG） data are contaminated by high-frequency random noise. The separation of noise from high-frequency signals is one of the most challenging tasks in processing of gravity gradient tensor data. We first derive the Cartesian equations of gravity gradient tensors under the constraint of the Laplace equation and the expression for the gravitational potential, and then we use the Cartesian equations to fit the measured gradient tensor data by using optimal linear inversion and remove the noise from the measured data. Based on model tests, we confirm that not only this method removes the high- frequency random noise but also enhances the weak anomaly signals masked by the noise. Compared with traditional low-pass filtering methods, this method avoids removing noise by sacrificing resolution. Finally, we apply our method to real gravity gradient tensor data acquired by Bell Geospace for the Vinton Dome at the Texas-Louisiana border.展开更多
In this paper we present a motion compensation (MC) design for the newest Audio Video coding Standard (AVS) of China. Because of compression-efficient techniques of variable block size (VBS) and sub-pixel interpolatio...In this paper we present a motion compensation (MC) design for the newest Audio Video coding Standard (AVS) of China. Because of compression-efficient techniques of variable block size (VBS) and sub-pixel interpolation, intensive pixel calculation and huge memory access are required. We propose a parallel serial filtering mixed luma interpolation data flow and a three-stage multiplication free chroma interpolation scheme. Compared to the conventional designs, the integrated architecture supports about 2.7 times filtering throughput. The proposed MC design utilizes Vertical Z processing order for reference data re-use and saves up to 30% memory bandwidth. The whole design requires 44.3k gates when synthesized at 108 MHz clock frequency using 0.18-μm CMOS technology and can support up to 1920×1088@30 fps AVS HDTV video decoding.展开更多
Cooperative communication is regarded as a promising technique for improving the reliability of wireless communication links and enhancing the radio coverage simultaneously. Unlike the conventional half-duplex(HD) mod...Cooperative communication is regarded as a promising technique for improving the reliability of wireless communication links and enhancing the radio coverage simultaneously. Unlike the conventional half-duplex(HD) mode relaying techniques,the full-duplex based two-way relaying(FD-TWR) enables data exchanges between two nodes to be completed within a single time-slot,thus resulting in a significant improvement in the spectrum efficiency. In this paper,the channel model of the FD-TWR is first given out,followed by deriving the critical performance metrics,including the received signal-to-interference-plus-noise ratio(SINR),the upper bound of the ergodic capacity and the closedform solution of the proposed FD-TWR under amplify-and-forward(AF) mode. Furthermore,taking the limit of sum-transmit-power into account,we formulate the objective function of the optimal power allocation of FD-TWR as an extreme-value problem by deriving the optimal transmit power for both the source nodes and the relay node. As long as the self-interference(SI) signal in the FD-TWR nodes can be sufficiently suppressed,the proposed scheme is shown to outperform the conventional HD mode in terms of both the ergodic capacity and the outage probability. In addition,regardless of the practical SI power,the proposedFD-TWR is always capable of achieving its best performance with an aid of the proposed optimal power allocation scheme.展开更多
文摘基于非共享策略,围绕着降低系统反应延迟与通信负荷的目标,提出了一种分两阶段渐进求解的分布式算法BOCS(based on the change of skyline),并对算法的关键实现环节,如协调站点与远程站点间的通信、skyline增量的计算等进行了系统优化,使算法在通信负荷与反应延迟上达到了较好的综合性能.理论分析证明,在所有基于非共享策略的算法中,BOCS算法通信最优.大量的对比实验结果也表明,所提出的算法高效、稳定且具有良好的可扩展性.
文摘针对无线传感网中分簇及路由过程中节点能量利用率较低、网络能耗不均衡以及网络的生命周期较短等问题,面向多Sink模式下的具有随机异构性能的传感器网络,为解决该问题,提出了一种基于随机多Sink模式下的异构网络组织策略NAHN(Networking Algorithm for Random Muti-Sink Heterogeneous Networks)。异构节点以自身能量、可达节点集、平均邻居节点距离以及距离信号集为簇首选举标准,提出了基于多Sink模式下的权值匹配策略,优化簇首能耗;以簇首单次中转损耗的能量为门限,综合考虑自身能量以及多Sink模式下距离信号集的影响,搭建出一条最优的通信链路,在保证链路质量的同时优化路由过程中的簇首节点的能量损耗。在与其他3种多Sink异构网络改进的路由算法的性能比较实验中,NAHR算法在提高节点能量利用率、延缓节点死亡、延长且稳定网络寿命等方面,优势均较为明显。
基金financially supported by the SinoProbe-09-01(201011078)
文摘In oil and mineral exploration, gravity gradient tensor data include higher- frequency signals than gravity data, which can be used to delineate small-scale anomalies. However, full-tensor gradiometry （FTG） data are contaminated by high-frequency random noise. The separation of noise from high-frequency signals is one of the most challenging tasks in processing of gravity gradient tensor data. We first derive the Cartesian equations of gravity gradient tensors under the constraint of the Laplace equation and the expression for the gravitational potential, and then we use the Cartesian equations to fit the measured gradient tensor data by using optimal linear inversion and remove the noise from the measured data. Based on model tests, we confirm that not only this method removes the high- frequency random noise but also enhances the weak anomaly signals masked by the noise. Compared with traditional low-pass filtering methods, this method avoids removing noise by sacrificing resolution. Finally, we apply our method to real gravity gradient tensor data acquired by Bell Geospace for the Vinton Dome at the Texas-Louisiana border.
基金(No. Y106574) supported by the Natural Science Foundationof Zhejiang Province, China
文摘In this paper we present a motion compensation (MC) design for the newest Audio Video coding Standard (AVS) of China. Because of compression-efficient techniques of variable block size (VBS) and sub-pixel interpolation, intensive pixel calculation and huge memory access are required. We propose a parallel serial filtering mixed luma interpolation data flow and a three-stage multiplication free chroma interpolation scheme. Compared to the conventional designs, the integrated architecture supports about 2.7 times filtering throughput. The proposed MC design utilizes Vertical Z processing order for reference data re-use and saves up to 30% memory bandwidth. The whole design requires 44.3k gates when synthesized at 108 MHz clock frequency using 0.18-μm CMOS technology and can support up to 1920×1088@30 fps AVS HDTV video decoding.
基金supported by the key project of the National Natural Science Foundation of China (No.61431001)5G research program of China Mobile Research Institute (Grant No.[2015] 0615)+1 种基金Key Laboratory of Cognitive Radio and Information Processing,Ministry of Education(Guilin University of Electronic Technology)the Foundation of Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services
文摘Cooperative communication is regarded as a promising technique for improving the reliability of wireless communication links and enhancing the radio coverage simultaneously. Unlike the conventional half-duplex(HD) mode relaying techniques,the full-duplex based two-way relaying(FD-TWR) enables data exchanges between two nodes to be completed within a single time-slot,thus resulting in a significant improvement in the spectrum efficiency. In this paper,the channel model of the FD-TWR is first given out,followed by deriving the critical performance metrics,including the received signal-to-interference-plus-noise ratio(SINR),the upper bound of the ergodic capacity and the closedform solution of the proposed FD-TWR under amplify-and-forward(AF) mode. Furthermore,taking the limit of sum-transmit-power into account,we formulate the objective function of the optimal power allocation of FD-TWR as an extreme-value problem by deriving the optimal transmit power for both the source nodes and the relay node. As long as the self-interference(SI) signal in the FD-TWR nodes can be sufficiently suppressed,the proposed scheme is shown to outperform the conventional HD mode in terms of both the ergodic capacity and the outage probability. In addition,regardless of the practical SI power,the proposedFD-TWR is always capable of achieving its best performance with an aid of the proposed optimal power allocation scheme.
