Results 31 to 40 of about 4,650 (163)
connection optimization of joint source and channel coding based on protograph LDPC codes [PDF]
香农的经典分离定理已证明,信源和信道编码分别达到最优时,整个系统的性能仍能保持最优。然而分离系统适用于码长无限长的点对点传输系统,并不适用于实际的传输系统中,联合信源信道编译码系统因为其良好的传输性能和低功耗的特点吸引了更多的关注。 目前存在很多联合信源信道编译码系统的设计方案,其中低密度奇偶校验码(LDPC码)由于其良好的逼近香农限的特点且较低的译码复杂度,被引入到信源和信道的编译码联合系统(JSCC)中,称之为D-LDPC的JSCC系统,为了更好的改进联合系统的性能和降低译码复杂度 ...
曹沙沙
core
ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
wiley +1 more source
Wearable multi sensor integrated system for gait analysis [PDF]
步态分析对于下肢运动评估和康复研究是很重要的一个手段,越来越多的实验室已经开始关注这方面的研究。而要进行步态分析,研究人员就需要生物力学数据采集设备,以获得原始信号进而对这些数据进行分析,有时甚至还需要采集各种步态相关信号,来进行数据融合处理。但是,目前市场提供的相关数据采集设备非常有局限性,并且通常一种设备只能采集获取一种相关信号,而且需要沉重的计算机作为控制中心。所以,应用这些数据采集设备进行步态分析实验时就会有两个问题:一是研究对象移动范围的限制,二是在需要数据融合处理时所有信号采集的同步问题 ...
王超
core
ABSTRACT Nanocomposite permanent magnets with reduced rare‐earth content represent a promising class of materials for next‐generation high‐performance applications. However, asynchronous precipitation of soft and hard magnetic phases often results in grain size mismatch and limited coercivity.
Xiaowei Zhang +6 more
wiley +1 more source
Based on conditional precharge technology, a design method of high speed and low power real phase clock trigger is presented. This method controls the redundant precharge activity of internal nodes by adding field effectors and control conditions to the ...
姚茂群(YAO Maoqun) +1 more
doaj +1 more source
Design of current-mode CMOS ADC circuit based on pipelined structure(基于Pipelined结构的电流型CMOS模数转换器电路设计)
低功耗设计在当前超大规模集成电路中越来越重要.以电流信号为转换对象,利用电流传输理论,结合电流型CMOS电路设计技术,设计了8位基于Pipelined结构的ADC电路.结果表明,利用电流型CMOS电路可方便地实现电流信号的加减与放大运算,避免了使用传统Pipelined电路结构中的运算放大器电路,因此电路结构简单,可显著降低电路的功耗,提高转换速度,计算机仿真结果表明,电路功能正确.
ZHOUXuan-chang(周选昌) +1 more
doaj +1 more source
Study of GHz Surface Acoustic Wave Humidty Sensor Using Nanostructured Materials [PDF]
随着物联网应用的不断扩展,需要大量传感器节点组成无线传感网络以实现未来万物互联的目标。其中,湿度测量器件在智能家居、气象、工业控制等领域是最为广泛和基础的传感器节点。为了实现无线传感网络,现有的电阻、电容型传感器件需要独立的电源系统持续供电,而在电池容量有限的条件下,器件需要采用占空比方式工作,即在高功耗的传感工作状态之间加入待机模式,以减小传感器节点的总功耗。由于待机模式的存在,无法对整个环境状态进行实时、无缝的检测,且由于构成节点的传感元件一般属于相对高功耗的器件,电池寿命始终有限。声表面波 ...
刘源
core
Design of pre-warning system for oil pipeline based on Beidou short message [PDF]
为解决移动通信网络盲区长距离输油管道盗漏预警的问题,利用北斗FB3511模块的短报文卫星通信功能,设计了集单片机、DSP、北斗模块于一体的低功耗长距离输油管道预警系统。根据输油管道预警系统工程应用的要求与通信网络盲区无法使用移动网络链路进行数据传输的特点,提出了实时预警、地理位置定位、分布式拓扑结构及低功耗的功能要求,据此完成了整个系统的方案设计。预警系统硬件平台由信号采集与调理模块、单片机模块、DSP模块、北斗短报文模块及供电模块组成,详细介绍了整个系统的工作流程。现场应用试验结果表明 ...
孙介涛 +5 more
core +1 more source
Survey on backscatter communication for zero-power IoT [PDF]
Although Internet of things (IoT) can enhance the quality of people’s life, but it also brings the problems of energy consumption and network transmission congestion.To solve the above problems, backscatter communication technology for zero-power IoT has
Xiaoxi ZHANG, Yongjun XU
core +1 more source
Giant Tunability of Individual Magnetic Skyrmion Size via an Oscillating Local Magnetic Field
ABSTRACT Magnetic skyrmions hold great promise as memory and computing elements in future spintronic devices. Despite the demonstration of various devices, techniques for addressable and high‐precision manipulation of individual skyrmions remain scarce.
Cai‐Hong Xie +13 more
wiley +1 more source

