相位量化DRFM欺骗干扰的自适应检测

为了从环境中检测出相位量化数字射频存储器(Digital radio frequency memory, DRFM)欺骗干扰的存在,本文设计了一种能够在均匀环境中检测出噪声、干扰或回波信号的自适应检测器。检测过程分为两步：先由基于广义 似然比检测(Generalized likelihood ratio test,GLRT)的自适应匹配滤波(Adaptive mat ched filter,AMF)检测器完成噪声和“信号”（滤波后的回波信号或干扰）的检测;再从回波信号和干扰导引矢量间的差异性出发重新设计检测器,以甄别回波信号或干扰。最后, 通过理论推导和蒙特卡洛试验对检测器的性能进行分析和评估,并与透视检测器进行比较。 仿真结果表明,在低相位量化位数和高信噪比的条件下,所设计的检测器能够正确检测出干 扰信号的存在。     

微流控电泳芯片微电导检测器的研制

结合电导测量原理以及计算机智能控制技术,设计了一种适合微流控电泳芯片电容耦合非接触电导检测器.文中具体介绍了该检测器硬件组成以及工作原理.该检测器的原理清楚,结构简单,易于微型化、集成化,不污染检测电极,在微型全分析系统中具有十分重要的应用价值.同时,该检测器的信号调理电路不仅可应用于微电导检测,还可配上不同的传感器用于其它测量微弱电流信号的场合.     

基于频率敏感注意力的短波宽带特定信号检测

为提高短波复杂电磁环境下特定信号检测识别准确率,提出了一种基于频率敏感注意力的短波宽带特定信号检测算法。依据短波特定信号在时频图中时间方向上的相关性和频率方向上的局部性,设计了一种具有窄长形状感受野的频率敏感注意力机制,通过将特征图沿时间轴方向进行条块分割并在条块内计算自注意力,捕获时间轴方向的远距离依赖关系并限制频率轴方向感受范围,并以此为基础构建了一种端到端的短波特定信号检测器频率敏感信号检测器（Frequency sensitive signal detector,FSSDet）。以短波宽带信号时频图为输入,FSSDet可直接输出多个特定信号的调制类型及起止时间、中心频率和带宽等重要参数信息。在包含8类47 880个样本的仿真数据集上进行实验,所提方法在0 dB以上的平均精度均值（mean Average precision, mAP）高达98.5,在信噪比低至-10 dB时仍高于72.5。结果表明,所提方法具有较高的短波特定信号检测识别准确率,在低信噪比下具备良好的鲁棒性。     

面向IDS的可变长检测器生成算法研究

在基于人工免疫的入侵检测系统（IDS）中,检测器集合直接影响检测结果的效率和准确度。针对目前基于人工免疫的IDS中检测效率和漏警率问题,提出了一种可变长检测器生成算法。该算法相对于已有的算法,降低了黑洞区域,减少了冗余检测器,提高了检测器生成效率和检测效率。给出了算法的设计思想、具体步骤以及在入侵检测系统中的具体实现。对算法的分析和实验表明,本算法用于入侵检测系统,提高了检测的准确率,降低了漏警率。同时,对各种异常检测向题具有一定的适用性。     

便携式电气元件检测器的数据采集系统设计

机车电气线路检测是机车检测的一项繁重任务,研制一种便携式电气元件检测器具有重要的意义.本文以Altera公司的cvclone系列FPGA EPIC20和AD公司的AD574A相结合来设计了多路模拟信号的数据采集系统,能够实现时多路电流、电压信号和开关信号的采集任务,为便携式电气元件检测器的研制提供了很好的数据采集前端.     

一种硬件开销低的电路延时故障检测方法

文章提出一种统一延时测试架构,通过重用在线延时故障检测设计资源实现离线延时检测;首先,提出了一种硬件开销较小的稳定性检测器,对每个关键组合输出的稳定性扰乱因子进行检测;然后通过在稳定性检测器中共享全局误差生成器,可生成各个稳定性检测器的全局误差信号,以表示是否存在延时故障;最后,在扫描链中集成了基于本地扫描的生成器,以支持基于扫描的离线延时检测;仿真实验结果表明,与以前技术相比,文章方法的硬件开销和设计复杂度更低。     

一种单检测器图像信号检测系统的设计

单检测器图像信号检测系统是可压缩成像系统的重要组成部分.利用光电倍增管作为光电传感器,并结合高速增强型51单片机编程控制A/D采样频率及串口,设计了单检测器图像信号检测系统.该系统可实现对高速变化的弱光信号进行检测、放大、滤波及传输等功能,并具有适应性好、结构简单、造价成本低等优点.     

一种噪声抑制的线性共轭多用户检测算法

当权向量受到噪声的影响时,最小输出能量（MOE）检测器的性能将显著下降．针对这一问题,设计了一种噪声抑制的线性共轭MOE检测器．将约束最小均方（LMS）算法应用到新的MOE检测器,提出一种基于约束LMS的盲噪声抑制线性共轭MOE多用户检测算法．该算法消除了权向量中的噪声分量,利用了接收向量的复数共轭,从而提高了系统的输出信干噪比和误码率性能．仿真结果表明所提算法有较好的性能．     

铁道信号电子设备联锁故障自动检测器的嵌入式设计

针对嵌入式铁道信号设备联锁故障诊断方法检测效率低、诊断精度低等问题,提出一种铁道信号电子设备联锁故障自动检测器的嵌入式设计方法。首先,结合嵌入式设计方法,设计信号采集器完成铁道信号电子设备状态信号的采集,设计铁道信号联锁设备故障分类器,实现对嵌入式铁道信号电子设备联锁故障信号的自动提取;然后采用EMD-ICA算法实现对信号的预处理;最后,提取故障信号高维特征,配合嵌入式硬件,获得电子设备故障特征向量,完成故障自动检测。实验结果表明,基于嵌入式的铁道信号电子设备联锁故障自动检测器,可对信号进行有效去噪,且故障诊断准确率较高,平均故障诊断时间仅为2.30 s,应用效果较好。     

数字信号的模糊检测

从实际检测器的检测特性的观点出发,提出了基于模糊集合划分的数字信号双阈值检测准则。根据此准则,设计了一种相应的模糊检测器结构。这种模糊检测器不仅误码率低,而且不需要时钟信号,因而有利于提高传输速率和可靠性。     

基于UHF传感器与以太网的GIS局部放电监测系统设计

针对传统局部放电监测采样率低、信号易受干扰、不利于实时监测,而超高频（ UHF）传感器进行局放监测因设备通信速度慢、无法故障录波的问题,设计了一种基于UHF传感器与以太网的气体绝缘开关设备（ GIS）局部放电监测系统。该系统由一个主控采集系统和若干个传感器模块组成,传感器模块获取局部放电产生的UHF电磁波信号0.3～2 GHz,通过对数检波电路降频至2～10 MHz;主控采集系统采集该信号,通过SDRAM缓存后经以太网发送至变电站管理员,实现对GIS局部放电高速实时在线监测。测试实验结果表明：该系统功能强,速度高,工作稳定,监测范围广,当局部放电发生时,系统能实时发送报警信号,并可提供故障信号波形用以故障分析。10/100 M以太网通信实际速度可达500 kB/s,比传统的RS—485通信速度提高90倍以上。     

ADS5287及其在MIMO接收机中的应用

介绍了TI公司模数转换器ADS5287的性能特点.用ADS5287作为模数转换器设计了MIMO中频接收机电路,完成了系统的PCB设计,并使用Hyperlynx软件中的Boradsim工具对设计中重要的高速信号线做了信号完整分析.     

Multicore implementation of a fixed-complexity tree-search detector for MIMO communications

Multicore systems allow the efficient implementation of signal processing algorithms for communication systems due to their high parallel processing capabilities. In this paper, we present a high-throughput multicore implementation of a fixed-complexity tree-search-based detector interesting for MIMO wireless communication systems. Experimental results confirm that this implementation allows to accelerate the data detection stage for different constellation sizes and number of subcarriers.     

Optimizing channel capacity in a MIMO–PSK wireless rayleigh fading channel

Due to the continual advancement of future generation communication systems, channel capacity is considered to be an important parameter for achieving greater signal strength by means of faster data transmission speed. Usually in multiple input multiple output (MIMO) systems, the diversity technique lessens the propagation speed significantly than the channel capacity. Using MIMO in combination with phase shift keying (PSK) modulation jointly known as MIMO–PSK systems, the present paper focuses on a novel distribution method in order to optimize the channel capacity over a Rayleigh fading channel. First, ergodic channel capacity and distribution capacity in terms of outage capacity is simulated for different MIMO–PSK configurations as well as channel conditions. Later, the channel performance of MIMO–PSK for the novel distribution conditions with antenna correlation effect is evaluated and finally the optimal channel capacity is determined.

     

On detection performance of MIMO radar for Rician target

By using spatial diversity, multiple-input-multiple-output (MIMO) radar can improve detection performance for fluctuating targets. In this paper, we propose a spatial fluctuation target model for MIMO radar, where targets are classified as non-fluctuating target, Rayleigh target and Rician target. Based on Stein’s lemma, we use relative entropy to study detection performance of optimum detector for Rician target. It is found that in low signal noise ratio (SNR) region, the performance improvement of MIMO ra...     

High level modeling and automated generation of heterogeneous SoC architectures with optimized custom reconfigurable cores and on-chip communication media

In this paper we propose a framework for modeling and automated generation of heterogeneous SoC architectures with emphasis on reconfigurable component integration and optimized communication media. In order to facilitate rapid development of SoC architectures, communication-centric platforms for data intensive applications, high level modeling of reconfigurable components for quick simulation and a tool for generation of complete SoC architectures is presented. Four different communication-centric platforms based on traditional bus, crossbar, hierarchical bus and novel hybrid communication media are proposed. These communication-centric platforms are proposed to cater for the different communication requirement of future SoC architectures. Multi-Standard telecommunication application is chosen as our target application domain and a case study of WiMAX is used as a real world example to demonstrate the effectiveness of our approach. A system consisting of an ARM processor, reconfigurable FFT and reconfigurable Viterbi decoder is considered with the option of system scalability for future upgrades. Behavior of system with different communication platforms is analyzed for its throughput and power characteristics with different reconfigurable scenarios to show the effectiveness of our approach.     

基于软件无线电的并行多输入多输出均衡技术

针对3GPP-LTE协议中多输入多输出(MIMO)均衡算法的高复杂度和高吞吐率问题,提出了一种面向软件无线电的并行MIMO均衡处理器,该处理器采用单指令流多数据流(SIMD)和超长指令字(VLIW)技术同时开发子载波间MIMO均衡和子载波内矩阵运算的并行性,并且每一个SIMD功能单元能够支持16 bit定点和20 bit伪浮点复数向量运算和矩阵运算,满足不同天线配置的MIMO均衡算法对处理精度、延迟和功耗的要求。实验结果表明,MIMO均衡处理器的4×4矩阵逆运算吞吐率达到了95 MInversion/s,满足3GPP-LTE协议的要求,并且其灵活可编程性和可配置性能够支持不同的均衡算法。     

Compact planar frequency reconfigurable multiple‐input‐multiple‐output antenna with pattern and polarization diversity characteristics for WiFi and WiMAX standards

A compact planar frequency reconfigurable dual‐band multiple‐input‐multiple‐output (MIMO) antenna with high isolation and pattern/polarization diversity characteristics is presented in this article for WiFi and WiMAX standards. The MIMO configuration incorporates two symmetrically placed identical antenna elements and covers overall size of 24 mm × 24 mm × 0.762 mm. Reconfiguration of each antenna element is achieved by using a PIN diode which allows antennas to switch from state‐1 (2.3‐2.4 GHz and 4.6‐5.5 GHz) to state‐2 (3.3‐3.5 GHz and 4.6‐5.5 GHz). In state‐1, the configuration offers isolation ≥18 dB and 20 dB in lower band (LB) and upper band (UB) respectively; whereas, in state‐2, isolation ≥21 dB and 20 dB in LB and UB respectively is achieved. The same decoupling circuit provides high isolation in dual‐band of two states, which makes overall size of the proposed design further compact. The antennas are characterized in terms of envelope correlation coefficient, radiation pattern, gain, and efficiency. From measured and simulated results, it is verified that the proposed frequency reconfigurable dual‐band multi‐standard MIMO antenna design shows desirable performance in both operating bands of each state and compact size of the design makes it suitable for small form factor devices used in future wireless communication systems.     

动态可重配置的星上嵌入式实时计算系统*

卫星上由于特殊条件的限制,计算机处理速度满足不了对信号处理的需要,而且不能在有限的硬件规模和功耗的情况下灵活地实现各种计算处理功能。提出了一种基于嵌入式微处理器配合大规模现场可编程门阵列（FPGA）的动态可重配置结构的星上实时计算系统的体系结构设计,可在一块FPGA资源上通过动态重配置实现不同的信号处理功能。实际应用证明,处理速度和性能得到了大幅度提高。     

UWB antenna and MIMO antennas with bandwidth,band‐notched,and isolation properties for high‐speed data rate wireless communication: A review

The prospective of ultrawide band (UWB) technology is enormous due to its remarkable advantages such as the capability of providing high‐speed data rates at short transmission distances with low power dissipation. The swift growth in wireless communication systems has made UWB an exceptional technology to replace the conventional wireless technologies in today's use. UWB bandwidth (3.1‐10.6 GHz) covers most of the communication applications. High frequency of operation with high level of miniaturization has enhanced the interest in designing high performance antennas. There is a growing demand for small and low cost UWB antennas that are able to provide satisfactory performance in both time and frequency domains. The trend in recent wireless systems, including UWB based systems, are to build small, low‐profile integrated circuits so as to be compatible with portable wireless devices. Transformation of UWB in MIMO achieved high data rate and solved the problem of multipath propagation. The main reason for writing this review is to investigate various UWB methods and band rejection approaches on a single platform. Some of the isolation enhancement approaches are also included in article due to the requirement in MIMO antennas.