SIFT特征提取算法的FPGA实时实现

为了在运动目标检测与跟踪系统中能够实时地提取目标的特征点,从而完成图像实时匹配操作,提出了在FPGA实现SIFT特征提取算法。该算法采用SRAM复用技术简化程序,合理设计FPGA各模块结构。此外,该算法采用定点小数来保证算法的精度要求。整个算法在Virtex-5硬件平台上实现,采用verilog语言进行程序的编写和调试。结果分析表明,优化后的SIFT算法能够稳定地在FPGA上实现,同时算法的复杂度得到了降低并达到了精度要求,且具有良好的实时性。     

一种改进的K-Best检测算法研究及实现

在研究MIMO系统检测算法理论及其实现方法的基础上,对已证明较优的算法进行结合和改进,提出了一种改进的K-Best检测算法及其实现方案,并通过仿真验证了方案的可行性。该算法采用预测技术和并行排序相结合的方法,降低了计算复杂度;采用并行流水线结构实现,节省了处理时间;并对方案在Xilinx公司的Virtex-5系列FPGA中的资源使用情况进行了统计。研究表明,实现方案可以用于MIMO系统检测算法的硬件实现。     

改进的K-Best检测算法研究及实现

在研究MIMO系统检测算法理论及其实现方法的基础上,对已证明较优的算法进行结合和改进,提出了一种改进的K-Best检测算法及其实现方案,并通过仿真验证了方案的可行性.该算法采用预测技术和并行排序相结合的方法,降低了计算复杂度;采用并行流水线结构实现,节省了处理时间;并对方案在Xilinx公司的Virtex-5系列FPGA中的资源使用情况进行了统计.研究表明,实现方案可以用于MIMO系统检测算法的硬件实现.     

基于FPGA的采集卡的图像增强算法应用研究

首先对图像采集卡系统的组成、整体方案和可行性进行了论证,然后给出了图像采集卡的硬件设计。用VHDL和原理图结合的方法对FPGA进行编程,实现了图像采集系统的各个功能模块。接下来提出一种采用设计的FPGA卡实现带修改参数的灰度变换图像增强算法,给出算法的详细表达式及其实现的定点化子程序,并且给出了图像算法在FPGA中采用VHDL语言的具体实现。最后,对算法的有效性进行了测试,比较了采用该算法及不采用该算法2种情况下的图像增强效果。     

GPS软件接收机算法研究

为了能快速、准确地提取导航数据,对GPS软件接收机的捕获和跟踪算法进行研究。捕获算法采用基于FFT的频域快速捕获算法,在跟踪环路中,载波跟踪算法采用锁相环(PLL),码跟踪算法采用非相干延迟锁相环(DLL),成功实现了对GPS信号的快速准确跟踪,这一处理算法性能优越,易于在PC机上软件实现。     

基于NiosⅡ用户自定义指令的AES算法实现

提出一种采用AES算法和RSA算法相结合的混合加解密算法,并采用Altera的NiosⅡ软核用户自定义指令功能实现该混合加解密算法.文中主要对该混合加解密算法中的AES算法进行了设计、论述,通过对AES算法的轮变换和密钥扩展两部分算法的分析,并在NiosⅡ软核上实现其自定义指令,就可以使用简单的几条语句快速地实现AES...     

改进BM算法的高速RS译码器方案及其FPGA实现

介绍了一种高速的RS译码器的结构方案。由于一般BM算法的实现结构不规则,以及延时过长的缘故,在VLSI的设计中,广泛采用的是eE算法,采用的改进BM算法,使得BM算法的实现结构规则,并且延时更小。另外还采用了一种新的有限域乘法结构,有规则的结构,易于HDL语言实现。     

基于ACELP语音编译码算法的软件实现及应用

文中针对Tetra通信系统中采用的ACELP算法,分析了该算法的基本原理,介绍了其算法基于VC++6.0的软件实现过程,重点阐述了ACELP在网络通信中的实现及应用情况。     

卫星通信中基于DSP的Viterbi算法的实现

在卫星通信系统中,卷积编码可以纠随机错误,实现差错控制,其译码芯片Q1900早已停产,从而转向采用其他手段实现Viterbi算法。用TMS320C54X系列芯片实现了Viterbi译码算法,介绍了软件实现的几个关键步骤,采用加-比-选方式,并利用大数判决准则,简化算法实现,同时,对算法进行了计算机仿真。根据实现情况计算其所需要的指令和时间,可完成多路译码。该方法已在实际工程中得到具体应用,系统运行稳定可靠。     

基于高速FFT结构的频域抗干扰算法的FPGA实现

提出了一种基于高速FFT结构的算法硬件设计与实现,FFT采用基4算法,旋转因子采用CORDIC算法生成,节省了存储资源,最后在硬件平台上测试,取得了很好的抗干扰效果.     

一种有限精度HRTF滤波器的高效实现方法

针对HRTF(Head Related Transfer Function,头相关传输函数)滤波器硬件实现时产生的FWL(Finite WordLength,有限字长)效应问题,提出了一种HRTF滤波器的高效实现方法。这种方法采用一种新的YWB(Yule-Walker+Balance Model Truncation)算法实现降阶,应用正规实现对抗FWL效应,并应用矩阵的Schur分解达到结构稀疏化。仿真结果说明了YWB算法显著的降阶效果,并说明了这种高效实现方法不仅能对抗FWL效应,而且大大降低了实现复杂度。     

一种基于FPGA的群路信号数字分路实现结构

研究了一种基于FPGA实现的群路信号数字分路实现结构。文中对分路算法进行数学推导,然后给出了FPGA实现结构,并在硬件平台上进行了验证。其结果表明,该结构能有效降低FPGA的硬件资源消耗,在全数字群解调器中有着良好地应用前景。     

基于双马尔科夫链的势概率假设密度滤波

针对已有的基于双马尔科夫链(PMC)模型的势概率假设密度(PMC-CPHD)滤波算法无法实现的问题,将PMC-CPHD算法改进为多项式形式以便于算法的实现,并给出了改进算法的高斯混合(GM)实现。实验结果表明给出的GM实现能够有效实现多目标跟踪,并且比基于PMC模型的概率假设密度(PMC-PHD)算法的GM实现提高了目标个数估计的稳定性。     

Towards automated implementation of adaptive systems from abstract SystemC specifications

Adaptivity is a key feature in embedded systems which requires explicit support in Electronic System-Level (ESL) design methodologies. Similarly, a higher level of abstraction during system specification is crucial for enabling ESL design activities such as Design Space Exploration. This has motivated the development of methodologies, such as A-HetSC, for enabling SystemC abstract specification of the adaptive parts of a system. However, in order to enable practical ESL design flows, it is essential to enable suitable implementation paths from the abstract adaptive specification. Otherwise, the cost of manual refinement of the abstract adaptive specification or simply the inability to systematically achieve an implementation will compromise the advantages obtained by the abstract model. This paper presents a system-level implementation methodology for tackling the implementation of the adaptive parts of an abstract SystemC specification. These adaptive parts are described as abstract adaptive processes, the basic constructs for specifying adaptivity in the A-HetSC methodology. The methodology proposes two main implementation paths. One path automatically targets an embedded SW implementation, for an immediate, flexible and cheap implementation of the adaptive processes. For the HW implementation path, a systematic SystemC-based refinement for targeting a refined model is proposed. Such a refined model is already supported by high-level synthesis tools, which automate the rest of the HW implementation path. It enables a cost efficient implementation of adaptive functionality in contexts where a software implementation does not fulfil time performance demands. The refinement of an adaptive inverse transform module, as part of an adaptive video decoder (AVD), is used as a demonstrative example.     

ERP实施过程持续改进策略的研究

为解决国内ERP实施失败率高的问题,以国产ERP实施关键成功因子模型为基础建立ERP实施关键成功因子的评价模型,最后建立ERP实施关键成功因子与实施成功(用户满意)之间关系的结构方程模型并估算各关键成功因子对用户满意的影响因子,实现对ERP实施过程的监督、控制,推动实施过程的持续改进,提高ERP实施成功率。     

A Systolic Array Implementation of the One-Shot Decorrelating Detector Used for Mobile CDMA Communications

A systolic array implementation of the one-shot decorrelating detector algorithm designed for Code-Division Multiple-Access (CDMA) spread spectrum communication systems used in mobile communications environments is developed. This detector has the advantage that it is near-far resistant, that is, it minimizes the interference effects that near-end users have on far-end users. However, its implementation requires the on-line inversion of the correlation matrix between the desired and interfering users. For this reason, a systolic computation approach is chosen to help solve the problem of fast on-the-fly matrix inversion. Performance of the proposed implementation is assessed via digital computer simulation. The implementation methodology presented here leads to a VLSI implementation structure.     

大型企业ERP实施能力测度模型研究

通过对ERP实施能力的评价和测度等问题进行研究,建立了针对大型企业ERP实施能力测度模型,提供可度量的测评方法和诊断体系,解决国内大型企业实施ERP过程中缺乏有效的能力诊断及评价方法的问题,最后以中国石油ERP系统的实施建设为例测度其ERP实施的总体能力,并针对其得分情况给出了具体的改进建议.     

Simulation and implementation tools for signal processing andcommunication systems

It is now possible to move easily from a top-level simulation model of a system toward its implementation. While this path is seamless and nearly complete for the digital implementation, gaps still exist for the implementation of RF and optical portions of communication systems. The author describes the state of the art in waveform (or functional) level simulation tools for communication and signal processing systems with links to digital implementation     

论ITSS的实施

实施ITSS,既可以是综合多项标准实施的系统工程,也可以是结合实际业务需求实施某项具体标准的项目工作.提出了一套ITSS实施方法论,并应用该方法对典型的应用场景进行实施验证,分析并定位存在的问题、提出问题解决途径、明确各角色任务、实施效果等.并列出了实施ITSS的关键成功因素.     

Efficient Implementation for Spherical Flux Computation and Its Application to Vascular Segmentation

Spherical flux is the flux inside a spherical region, and it is very useful in the analysis of tubular structures in magnetic resonance angiography and computed tomographic angiography. The conventional approach is to estimate the spherical flux in the spatial domain. Its running time depends on the sphere radius quadratically, which leads to very slow spherical flux computation when the sphere size is large. This paper proposes a more efficient implementation for spherical flux computation in the Fourier domain. Our implementation is based on the reformulation of the spherical flux calculation using the divergence theorem, spherical step function, and the convolution operation. With this reformulation, most of the calculations are performed in the Fourier domain. We show how to select the frequency subband so that the computation accuracy can be maintained. It is experimentally demonstrated that, using the synthetic and clinical phase contrast magnetic resonance angiographic volumes, our implementation is more computationally efficient than the conventional spatial implementation. The accuracies of our implementation and that of the conventional spatial implementation are comparable. Finally, the proposed implementation can definitely benefit the computation of the multiscale spherical flux with a set of radii because, unlike the conventional spatial implementation, the time complexity of the proposed implementation does not depend on the sphere radius.