采用Simulink/Stateflow的隐身数据链仿真及性能评估框架实现

对数据链仿真现状进行了分析,以Simulink/Stateflow为仿真平台,搭建了隐身数据链仿真及性能评估框架。仿真结果表明,采用Simulink/Stateflow对隐身数据链系统建模、仿真、性能评估在技术上是可行的。研究内容对隐身数据链仿真和性能评估具有一定的参考价值。     

基于层次分析-模糊综合评估的LINK-16作战效能评估模型研究

将层次分析-模糊综合评估模型引入LINK-16作战效能评估,从数据链作战应用能力的角度建立分层的效能评估指标体系,将指标的定量测量和定性分析相结合,提出数据链作战效能综合评价值的计算方法,为数据链作战效能评估提供一种新的研究视角。     

空中航迹质量度量方法研究

战术数据链是C4ISR系统的基本组成部分,用于实现战场空间内各平台的网络互联,为平台间提供实时的信息交换,并将在未来网络中心战中发挥重要作用,最终大大提高作战效能。为了研究数据链的作战效能,针对战术数据链的应用,以防空作战为背景,提出了空中航迹质量度量的概念,建立了空中航迹完整性、清晰性、连续性和精确性的度量方法,为数据链作战应用的效能评估提出了一种解决途径。     

战术数据链网络建模与仿真

网络性能的优劣直接关系到战术数据链系统作战效能的发挥,对数据链网络系统性能的仿真评估具有一定的现实意义。在OMNeT++上搭建Link-16网络仿真模型,利用MiXiM对数据链网络系统节点的功能进行分层实现,并详细分析了各节点的系统响应时延、端到端时延及丢包率对网络整体效能的影响,对进一步研究数据链网络具有一定的参考价值。     

LINK-16数据链作战效能评估研究

数据链作为信息化条件下的网络基础设施,已成为支持未来联合作战的主要装备。将层次分析法引入数据链效能评估中,建立了分层结构的作战效能评估指标体系。详细分析了态势信息共享、指挥控制、协同、链路转发和网络可用度等重点指标的评估数学模型,提出了定性指标、权重和作战效能综合评价值的计算方法,为数据链作战效能评估研究提供了一种新的研究视角。     

战术数据链传输性能评估方法研究

战术数据链不同于普通的数据通信系统,其性能与指控系统密切相关,以往的评估方法不能充分检验其传输性能。结合战术数据链与指控系统之间的数据传输实际,从战术数据链传输的准确性和时效性两个方面,提出了相应的指标体系和计算公式,提高战术数据链传输性能评估的实用性。     

基于多智能体的数据链系统效能评估研究

根据数据链系统效能评估需求,本文采用基于多智能体的建模方法,建立数据链系统分层一体化模型。并从作战应用能力的角度建立分层的效能评估指标体系,采用层次分析——模糊综合评估模型对数据链系统进行效能评估,为数据链系统效能评估提供一种新的研究视角。     

战术数据链体系贡献率评估方法研究

文中通过分析体系贡献率的概念,研究了战术数据链各作战能力的贡献度,提出了一种基于体系作战任务成功率的体系贡献率的评估方法,为战术数据链的作战能力评估进行了有意义的探索,可为其他武器装备体系贡献率的评估提供一定的参考.     

对Link16数据链通信的干扰效能评估

文章首先分析了Link16数据链的抗干扰性能,并对两种针对Link16的干扰手段及其效能进行了分析,抽象、量化影响干扰效能的一系列因素,进而得到Link16数据链通信干扰作战效能评估模型,最后对该评估方法进行了初步验证。     

基于SEA方法的舰船数据链效能评估系统设计与仿真

按照决策支持系统的设计思路,研究了舰船数据链效能评估系统的组成、基本结构以及系统模型的输入输出关系、运行流程,利用人机交互、多模型组合技术,实现了舰船数据链效能评估系统软件平台,并提供了仿真界面和界面内容。     

On antenna design and capacity analysis for the forward link of amultibeam power controlled satellite CDMA network

This paper deals with the problem of rigorously analyzing the forward link behavior of a power controlled CDMA-based satellite multibeam communication system. For the first time, the complete system links equations are expressed in a compact matrix form so that they can be solved simultaneously, thus leading to an exact problem solution. In particular the effect of actual antenna beam patterns, overlapping satellites interference, users location, conventional and linear blind minimum output energy (MOE) CDMA detectors are accounted for by comprehensive system analysis. Under simplified yet realistic system assumptions, the proposed technique allows us to derive the key satellite antenna parameters. It is shown that for power controlled CDMA satellite networks, the key antenna figure of merit is the average gain and the so-called antenna inverse average interference-to-carrier ratio rather than the more intuitive average carrier-to-interference ratio. It is shown that under simplified system assumptions, these parameters can be used to compute simple yet accurate one-dimensional system link budget. Also, by means of a simplified system analysis, the antenna beam overlapping point capacity impact is determined. Furthermore, results about system capacity and outage probability for a practical personal communication satellite network are presented with and without adopting an advanced CDMA MOE single-user detector. The MOE advantages in terms of capacity increase for a given outage probability are shown to be substantial when the system loading is appreciable, even assuming perfect power control     

A patient-adaptable ECG beat classifier using a mixture of expertsapproach

Presents a “mixture-of-experts” (MOE) approach to develop customized electrocardiogram (EGG) beat classifier in an effort to further improve the performance of ECG processing and to offer individualized health care. A small customized classifier is developed based on brief, patient-specific ECG data. It is then combined with a global classifier, which is tuned to a large ECG database of many patients, to form a MOE classifier structure. Tested with MIT/BIH arrhythmia database, the authors observe significant performance enhancement using this approach     

Performance Analysis of Blind Adaptive MOE Multiuser Receivers Using Inverse QRD-RLS Algorithm

The inverse QR (IQRD) recursive least-squares (RLS) algorithm (IQRD-RLS) is very popular because it has good numerical stability and can be mapped onto COordinate Rotation DIgital Computer (CORDIC) processor-based systolic arrays, which are suitable for very large-scale integrated circuits (VLSI) architecture and real-time applications. In this paper, the blind optimal minimum output energy (MOE) detector which is developed for multiuser detection (MUD) in direct-sequence code-division multiple-access (DS-CDMA) systems is implemented using the linearly constrained IQRD-RLS algorithm. Specifically, the max/min approach is combined with subspace tracking for producing the optimal MOE multiuser detector. A new fast subspace tracking algorithm based on Lagrange multiplier methodology and the IQRD-RLS algorithm is developed. A comparative analysis among the recently emerged channel-estimation techniques is conducted using the IQRD-RLS algorithm. The corresponding robust MOE receivers at low SNR are implemented using the IQRD method, and their performances are assessed in terms of SINR, BER, and computational complexity. A robust multiuser receiver is developed by adding a quadratic inequality constraint to the optimal max/min MOE detector. The feasibility of systolic array implementation of the IQRD-based optimal MOE detector is explored. Several simulation experiments are conducted in a severe near–far environment to analyze the IQRD-based receivers and the subspace tracking algorithms.      

Multiple Edge Responses for Fast and Accurate System Simulations

High-speed input/output (I/O) link performance is limited by random noise as well as signal integrity issues such as dispersion, reflections, and crosstalk. Hence, accurate prediction of system performance including these random and deterministic noise is crucial in high-speed link design. This paper presents a novel, fast, and accurate method to simulate the time-domain system response. The presented method calculates the system response using multiple edge responses (MER) based on linear superposition. Being able to take into account system nonlinearity more accurately, the presented method significantly improves simulation accuracy compared with the other published fast simulation techniques based on either single bit response (SBR) or double edge responses (DER), while at the same time maintaining equivalent numerical efficiency. Furthermore, peak distortion analysis, which is commonly used to find the worst-case data pattern based on SBR, is extended for DER and MER using dynamic programming. A multiphase worst-case data pattern approach is also introduced in this paper in order to determine the worst-case system performance under both timing and voltage consideration.      

QualNet环境下数据链的性能仿真

战术数据链是数据通信技术在军事方面的典型应用,主要采用通信网络技术和应用协议,实现机载、陆基和舰载战术数据系统之间的新型数据交换及战术系统的各项功能,因此组网协议的研究是数据链系统工作的核心.文中介绍QualNet环境下数据链的系统建模和系统仿真实验,得到数据链的网络规模、网络循环周期、系统响应时间、MAC端到端时延等总体性能指标,以及这些总体性能的影响因素和相互关系.     

Advanced Modeling and Accurate Characterization of a 16 Gb/s Memory Interface

As the input/output (I/O) data rate increases to several gigabits per second, determining the performance of high-speed interfaces using conventional simulation and measurement techniques is becoming very challenging. The models of the interconnects have to be broadband and accurate to represent high frequency and second-order effects such as frequency dependence of dielectric losses and surface roughness. The large and small signal behaviors of the transmitter and receiver circuitries have to be correctly represented in link analysis. In addition, the system simulation needs to properly capture the interactions between the circuits and interconnect subsystems to optimize the overall system. However, determining the values of the critical link parameters and their correlations can be complicated. Some of the key parameters are not deterministic and some cannot be observed directly. A combined modeling and measurement approach is indispensable to determine the performance of high-speed links. This paper presents the modeling and characterization techniques employed in the design and verification of a 16 Gb/s bidirectional asymmetrical memory interface. Direct frequency and time-domain methods as well as indirect techniques based on bit-error-rate testing are used to model and determine important link parameters. Complex de-embedding procedures are utilized to extract parameters from externally observed data. On-chip measurements are also used to complement off-chip instrumentation and accurately measure the true performance of the link. The modeling and characterization of prototypes are also discussed and model-to-hardware correlations are presented at component and system levels. Based on both simulation and measurement results, the behavioral model of the complete system is constructed and statistical simulation technique is used to predict the yield and performance at low bit error rate.      

基于VC++的战术数据链通信仿真系统设计与实现

为了实现战术数据链通信仿真系统,在分析与研究联合战术信息分发系统(JTIDS)关键技术的基础上,构建了战术数据链链路层仿真模型。依据仿真模型中各模块的划分,以VC++语言为编程实现平台,采用面向对象的程序设计方法,设计并实现了Reed-Solomon码(RS码)编译码类、循环码移位键控类、最小移频键控类。最后在高斯白噪声信道下对仿真系统进行了验证和性能分析。结果表明,设计的各个类模块功能满足系统指标,基于各个类模块构建的仿真系统符合设计要求,为下一步研究JTIDS系统干扰与抗干扰性能奠定了基础。     

基于TD-SCDMA R4路测数据评估HSUPA系统吞吐量的方法研究

本文利用实际TD-SCDMA网络中车载测试得到的测试数据,结合对网络干扰情况的预算及HUSPA系统链路级仿真结果,提出一种评估HSUPA系统吞吐量的方法。该方法考虑了实际的网络拓扑结构及自然传播环境,并且实现方法简单,结果更具有实际意义。     

The TDMA burst-mode link analyser with least-squares algorithm

The burst-mode link analyser with the decompositional least-squares algorithm (BMLA/LS) is an attractive and novel computational approach for impulse response measurement and equalization of a QPSK/TDMA satellite communication channel. Analysis and simulation confirms it to be superior to the current BMLA/radar approach. This paper presents a brief and systematic introduction to the methodology of the subject, and to software simulation, system design and hardware implementation.