一种基于约束最小四阶矩的盲自适应多用户检测方法

基于约束最小四阶矩(Least Mean Fourth,LMF)准则,提出了一种新的高阶统计类型的盲多用户检测方法.通过理论分析和证明,采用此准则的盲多用户检测算法能够收敛于全局最小值,且该极值点符合多用户信号迫零解相关的要求.利用最速下降梯度方法,文中给出了盲自适应LMF接收机形式.该多用户接收机具有运算复杂度低,收敛性能好的特点.在AWGN信道和多用户环境中的仿真结果进一步验证了理论分析的结论.     

基于AD9851的高频高压脉冲发生器设计

当前脉冲发生器里的脉冲形成器件,大部分是用火花气隙（spark gap）和高压电子开关（high voltageswitch）.采用火花气隙充当脉冲形成器件有很多弊病：（1）火花气隙在低于1kV时,在机械和电气上不稳定,所以对低于2kV的试验电压要通过分压器来得到.     

An Artificial Motion and Tactile Receptor Constructed by Hyperelastic Double Physically Cross-Linked Silk Fibroin Ionoelastomer

Ionotronic artificial motion and tactile receptor (i-AMTR) is essential to realize an interactive human-machine interface. However, an i-AMTR that effectively mimics the composition, structure, mechanics, and multi-functionality of human skin, called humanoid i-AMTR, is yet to be developed. To bridge this technological gap, this study proposes a strategy that combines molecular structure design and function integration to construct a humanoid i-AMTR. Herein, a silk fibroin ionoelastomer (SFIE) with double cross-linked molecular structure is designed to mimic the composition and structure of human skin, thereby resolving the conflict of stretchability, softness, and resilience, suffered by many previously reported ionotronics. Functionally, electromechanical sensing and triboelectricity-based tactile perception are integrated into SFIE, to enable simultaneous perception of both motion and tactile inputs. By further leveraging the machine learning and Internet of Things (IoT) techniques, the proposed SFIE-based humanoid i-AMTR precisely senses the movement of human body and accurately sortball objects made of different materials. Notably, the success rate for 610 sorting tests reaches as high as 92.3%. These promising results essentially demonstrate a massive potential of humanoid i-AMTR in the fields of sorting robots, rehabilitation medicine, and augmented reality.     

A passive UHF RFID tag with a dynamic-Vth-cancellation rectifier

This paper presents a passive UHF RFID tag with a dynamic-Vth-cancellation(DVC) rectifier. In the rectifier, the threshold voltages of MOSFETs are cancelled by applying gate bias voltages, which are dynamically changed according to the states of the MOSFETs. The DVC rectifier enables both low ON-resistance and small reverse leakage of the MOSFETs, resulting in high power conversion efficiency(PCE). An area-efficient demodulator with a novel average detector is also designed, which takes advantage of the rectifier’s first stage as the envelope detector. The whole tag chip is implemented in a 0.18 μm CMOS process with a die size of 880×950 μm2. Measurement results show that the rectifier achieves a maximum PCE of 53.7% with 80 kΩ resistor load.     

采用多级技术的DBF雷达CCAB算法

数字波束形成算法中,CCAB算法在较高信干噪比条件下具有一定优势。但是计算时需要求逆矩阵,在阵元数较多的情形下运算量极大,很难实时实现,严重制约了其进一步的应用。提出了一种基于原有CCAB算法的多级计算方法,可以有效地减少运算量。实验表明,该方法虽然其信噪比性能比普通CCAB算法有所下降,但是仍能在干扰方向上形成较深的零陷并有效地抑制干扰,能够进一步应用于实际工程中。     

一种脉宽鉴别算法及其在雷达中的应用

现代雷达常采用波形捷变技术对抗有源干扰,当干扰信号较强时,经过脉压后的输出仍然会对后继的信号检测造成影响。为解决此问题,本文提出一种新颖的脉宽鉴别算法,配合波形捷变技术抑制有源干扰,仿真结果证明了该算法的有效性。     

油田含CO2伴生气变压吸附材料实验研究

变压吸附工艺是国内小规模CO_2驱产出气处置的常用手段,而吸附剂是吸附分离的基础。选用6种沸石类吸附剂,测试了CO_2/CH4单组分吸附平衡等温线,分析了温度对吸附量的影响。优选了两种材料进行了CO_2-CH4混合气体竞争吸附实验,重点分析了温度、压力、气体组分、CO_2含量等因素对吸附剂吸附分离效果的影响,评价了油、水含量对吸附剂的损伤。实验结果表明:吸附剂的分离系数与混合气体中CO_2含量无明显相关性,但吸附体系压力的变化对混合气体分离效果影响较大。在初始气体CO_2摩尔分数50%、温度20℃、压力2.5MPa条件下,优选的吸附剂13X对混合气体的分离系数为25。油水的存在会对吸附剂的分离性能产生较大影响,在温度20℃、压力2.5 MPa、13X吸附剂含水摩尔分数10%及含油摩尔分数10%条件下,吸附总量分别下降32%和78%,分离系数分别下降48%和78%。     

偏振无关光隔离器的偏振相关损耗分析

在波动光学理论基础上,建立了求解光隔离器偏振相关损耗的理论模型,分析了影响光隔离器偏振相关损耗的因素.实际测量结果与理论分析相吻合.     

2.8kV、140ps高压电脉冲的产生

研制了雪崩二极管脉冲成形电路,简述了此电路的工作原理,用此线路产生了幅度2.8kV、宽度140ps的高压电脉冲。