数字信号处理IP的层次化设计与验证

对数字信号处理IP设计流程各个阶段的设计和验证的任务和目标进行了一般性探讨,提出了一种层次化的数字信号处理IP的设计、验证流程,并且给出设计实例.该流程的设计阶段包括理论算法设计、需求设定、定点算法设计和验证、电路接口和时序设计以及算法/软件/硬件协同验证,采用该流程能够有效地提高数字信号处理IP的设计和验证的效率.     

CORDIC-based VLSI architectures for digital signal processing

The evolution of CORDIC, an iterative arithmetic computing algorithm capable of evaluating various elementary functions using a unified shift-and-add approach, and of CORDIC processors is reviewed. A method to utilize a CORDIC processor array to implement digital signal processing algorithms is presented. The approach is to reformulate existing DSP algorithms so that they are suitable for implementation with an array performing circular or hyperbolic rotation operations. Three categories of algorithm are surveyed: linear transformations, digital filters, and matrix-based DSP algorithms     

并行算法在软件无线电多DSP平台的应用

近年来，随着软件无线电的发展，用于软件无线电平台中的多DSP并行结构受到越来越多的关注，因为这种结构能提高数字信号处理的速度。提出了一种适合在该平台上并行运算的算法，以多阶FIR滤波器为例，验证了算法，并探讨算法的性能，给出了该算法在多处理器条件下，与单处理器处理结果的比较。对选取合适的软件无线电中频处理多处理器平台具有一定的参考价值，并对舰载软件无线电的实现提供了科学参考。     

8mm战场侦察雷达信号处理系统的实现

论述了８ｍｍ战场侦察雷达信号处理系统的距离估算、参数计算、硬件结构等问题。在距离估算中提出了综合相参积累和非相参积累的雷达距离公式。信号处理算法采用流水线结构,根据这一特点,整个硬件系统采用６片ＡＤＳＰ２１０６０数字信号处理芯片,通过巧妙的连接组合实现了系统所要求完成的算法。通过扩展的串口和并口实现了和天控、计算机有效连接。     

A new fast method for the reconstruction of 2-D microwave images ofrotating objects

The problem of microwave imaging of rotating objects is approached from a digital signal processing point of view. Attention is focused on the reconstruction of the two-dimensional (2-D) image of an object obtained by processing complex samples of the continuous wave (CW) signal return received for different object aspect angles covering a 2pi total variation. The effects of a polar sampling of the Fourier transform (FT) of the target reflectivity function on the impulse response of the imaging system are analyzed. A criterion for the choice of the angular sampling interval in order to control the image blurring is given. Finally, a new and fast digital signal processing method for image reconstruction is proposed. This method reconstructs high resolution images of rotating targets illuminated by a CW electromagnetic signal or by a large bandwidth transmitted signal. This algorithm is suitable for processing wideband received signal of targets observed for a large variation of the viewing angle, so it is very attractive for the reconstruction of very high spatial resolution target images in SAR/ISAR systems. To show the performance of the method we finally present and discuss the results obtained by applying the proposed technique on simulated and experimental data.     

Active noise control: a tutorial review

Active noise control (ANC) is achieved by introducing a cancelling “antinoise” wave through an appropriate array of secondary sources. These secondary sources are interconnected through an electronic system using a specific signal processing algorithm for the particular cancellation scheme. ANC has application to a wide variety of problems in manufacturing, industrial operations, and consumer products. The emphasis of this paper is on the practical aspects of ANC systems in terms of adaptive signal processing and digital signal processing (DSP) implementation for real-world applications. In this paper, the basic adaptive algorithm for ANC is developed and analyzed based on single-channel broad-band feedforward control. This algorithm is then modified for narrow-band feedforward and adaptive feedback control. In turn, these single-channel ANC algorithms are expanded to multiple-channel cases. Various online secondary-path modeling techniques and special adaptive algorithms, such as lattice, frequency-domain, subband, and recursive-least-squares, are also introduced. Applications of these techniques to actual problems are highlighted by several examples     

新型多路数控增益放大器

介绍了一种新型多路数控增益放大器。该放大器具有8路模拟信号输入通道,采用3位数字信号控制通道位;每个通道均具有256级增益控制,采用8位数字信号控制放大倍数;输入信号采用绝对值处理电路,具备极性判别信号输出。采用多芯片微组装技术实现,体积小、重量轻,可用做小型微机处理电路的模拟接口芯片。简要介绍了基于该放大器的某设备控制与保护系统的应用示例。     

远场激光能量的多通道同步测量系统设计

设计了一个基于DSP的远场激光能量多通道同步测量系统.系统采用DSP芯片TMS320F2812作为核心数字信号处理器,结合CPLD控制A/D转换芯片采集信号并完成数字信号阈值判别、寻峰、数据处理等任务,从而提高了系统的处理速度和处理能力,满足了实时处理入射激光信号的要求.     

DAB直放站多径抵消系统的设计

设计的直放站回波抵消系统,用数字信号处理技术从根本上解决了单靠天线隔离所不能解决的问题.针对LMS算法在硬件实现上的局限提出了一种改进的DLMS算法,以适应高速实时信号处理,并在Xilinx Virtex-4FPGA上完成了设计.     

基于DSP的数字音频处理系统

介绍了一种基于DSP的数字音频处理系统.后级音频功放电路以DPPC2006为核心,选用H桥输出方式,提高了电源的使用效率,方案具有很强的灵活性,可以采用各种快速音频处理算法实现各种声场效果.     

EMD方法及其在红外气体传感器信号处理中的应用

该文研究了经验模式分解(Empirical Mode Decomposition,EMD)方法在红外气体检测中的应用。针对红外气体浓度信号的特点对算法进行了改进,使得算法能够在不分解出所有IMF(Intrinsic Mode Function)分量的情况下,正确提取所需的IMF分量。与低通滤波和锁相等方法进行了比较分析,结果表明,改进后的EMD算法具有所需数据量少、计算量小、提取的有用信号能量损失少等优点,可以快速识别气体浓度的变化,有效提高气体浓度测量的精度,适用于在线实时检测。     

可编程模糊逻辑控制器芯片的应用应用

研究了一种电流型可编制模糊逻辑控制器芯片（PFLC）的两种典型应用。在智能控制领域,利用PFLC设计并调试了倒立模糊控制系统,系统参数可由线性二次最优控制的方法导出。在信号处理领域,设计了一种基于PFLC的模糊自适应非线性均衡器,学习算法采用LMS算法,只需8次乘法运算,易于将PFLC扩展成为自学习模糊控制器芯片。     

高速DSP新技术在雷达信号处理中的应用

分析高速DSP的发展趋势和特点，针对当前雷达信号实时处理的应用背景，提出实时信号处理设计的新方法。首先利用数据通信的新手段，缓解了运算与通信的矛盾。其次，以通用化为目的，将算法软件设计与底层硬件设计隔离，使设计对硬件的依赖最小化，加快了设计进程。在此基础上，引入了新的设计方法，在Matlab环境下，将实时信号处理算法的仿真、编程、调试集成一体。     

EVM measurement of modulation fidelity of π/4 DQPSK baseband modulators

An algorithm for the calculation of optimized error vector magnitude (EVM) and offset vector magnitude (OVM) parameters for m-ary PSK baseband modulators (BMs) is presented. It does not require the regeneration of an ideal reference signal but is based on a mixed time and frequency domain software digital signal processing of a short (256 symbol) random data test signal. The frequency domain processing is required for phase rotation compensation. An automatic test equipment (ATE) implementation of the algorithm as part of an IS-136 π/4 DQPSK baseband modulator IC production line quality control is described, together with some typical measurement results.     

Modified ADALINE algorithm for harmonic estimation and selective harmonic elimination in inverters

In digital signal processing, algorithms are very well developed for the estimation of harmonic components. In power electronic applications, an objective like fast response of a system is of primary importance. An effective method for the estimation of instantaneous harmonic components, along with conventional harmonic elimination technique, is presented in this article. The primary function is to eliminate undesirable higher harmonic components from the selected signal (current or voltage) and it requires only the knowledge of the frequency of the component to be eliminated. A signal processing technique using modified ADALINE algorithm has been proposed for harmonic estimation. The proposed method stays effective as it converges to a minimum error and brings out a finer estimation. A conventional control based on pulse width modulation for selective harmonic elimination is used to eliminate harmonic components after its estimation. This method can be applied to a wide range of equipment. The validity of the proposed method to estimate and eliminate voltage harmonics is proved with a dc/ac inverter as a simulation example. Then, the results are compared with existing ADALINE algorithm for illustrating its effectiveness.     

自适应OFDMA系统无线资源管理的CPN建模与仿真

基于自适应OFDMA系统,对多业务系统中基于总发射功率最小化的无线资源管理问题进行研究,并使用着色Petri网(CPN,coloured Petri nets)以及CPN分析工具CPN Tools对其进行建模。采用Monitor监控器对模型进行仿真分析,并将仿真结果与随机Petri网(SPN,stochastic Petri nets)模型以及基于吞吐量最大化的CPN模型进行比较,验证了该系统模型的正确性和优越性。     

一种下三角复矩阵求逆方法的IP设计与实现

矩阵运算是很多科学运算中的常见运算,矩阵求逆在矩阵运算中有着举足轻重的作用,在数字信号处理过程中常常被运用到。本文根据一种便于ASIC实现的矩阵求逆算法,提出了一种最大阶数为16阶复矩阵求逆的IP设计串行实现方法。首先本文分析了算法的特殊性,然后提出此IP设计方法的实现思路和结构,最后用Verilog语言进行实现并用M...     

基于DSP的雷达数字信号处理通用模块

介绍了基于多个DSP芯片－ADSP21060和大规模可编程器件的雷达数字信号处理通用模块。根据系统处理功能与性是标的不同，构建具有一定拓扑结构的雷达数字信号处理系统。通过信号处理算法并行设计、系统多数据流设计、处理任务合理分配与调度、高效容错的程序设计，实现高速实时雷达数字信号处理。该系统具有结构灵活，可编程性好、可扩展性强的特点。     

TMS 32020单片信号处理器在测控系统中的应用

在卫星地面测控系统中,要求在低信噪比(如-20分贝)条件下提取目标的多普勒频率信息,以引导接收机锁相环捕获信号并锁定。模拟式频率引导采用经典的晶体滤波器组,其数量大、成本高、重量体积大。数字式频率引导采用对接收信号采样序列进行FFT运算处理实现对目标的频率捕获,具有显著的优越性。作者等人以8086微机实现的数字频率引导设备已成功地应用于同步通讯卫星测控站中。为了进一步提高处理速度,采用了TMS32020单片信号处理器研制出频率引导快速处理机,使频率引导处理时间提高15倍以上。该成果的硬件设备可适应不同的实时数字信号处理要求,应用于雷达、通讯、遥控、仪器、语音、智能等各种场合。