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Distributed detection of moving target using MIMO radar in clutter with non-homogeneous power 功率非均匀杂波条件下MIMO雷达运动目标的分布式检测
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931517
Pu Wang, Hongbin Li, B. Himed
Previously, we studied moving target detection (MTD) using a distributed MIMO radar, where the multi-static transmit-receive configuration causes non-homogeneous clutter. By representing the non-homogeneous clutter in a low-rank subspace with different subspace coefficients for different transmit-receive pairs, a generalized likelihood ratio test (GLRT), which is referred to as the MIMO-GLRT, was introduced. The MIMO-GLRT, however, is a centralized detector requiring the distributed receivers to send their local observations to a fusion center, which performs parameter estimation and computes a global test variable. In this paper, we consider distributed detection for the moving target problem. The goal is to reduce the communication overhead as well as power/bandwidth consumptions from the receivers to the fusion center. We consider two distributed implementations of the MIMO-GLRT, with or without local data aggregation. Specifically, the one that performs local aggregation computes a single local test statistic at each receive antenna, by using the outputs of all matched filters (each matched to a waveform unique to one transmit antenna); meanwhile, the one that does not perform local aggregation computes multiple local test statistics, one for each matched filter output. In both cases, the local unquantized test statistics from all receive antennas are forwarded to the fusion center and non-coherently combined to form a final test variable. Simulation results are provided to illustrate the performance loss with respect to the centralized MIMO-GLRT and compare with another distributed MIMO moving target detector based on a homogeneous assumption.
在此之前,我们研究了使用分布式MIMO雷达的运动目标检测(MTD),其中多静态发射-接收配置导致非均匀杂波。通过对不同的收发对用不同的子空间系数表示低秩子空间中的非均匀杂波,引入广义似然比检验(GLRT),简称MIMO-GLRT。然而,MIMO-GLRT是一个集中式探测器,要求分布式接收器将其本地观测数据发送到融合中心,融合中心执行参数估计并计算全局测试变量。本文考虑了运动目标问题的分布式检测。目标是减少通信开销以及从接收器到融合中心的功率/带宽消耗。我们考虑了MIMO-GLRT的两种分布式实现,有或没有本地数据聚合。具体地说,执行本地聚合的一个通过使用所有匹配滤波器的输出(每个滤波器与一个发射天线唯一的波形匹配)在每个接收天线上计算单个本地测试统计量;与此同时,不执行本地聚合的一个计算多个本地测试统计信息,每个匹配的过滤器输出一个。在这两种情况下,来自所有接收天线的局部非量化测试统计量被转发到融合中心并进行非相干组合以形成最终测试变量。仿真结果说明了集中式MIMO- glrt的性能损失,并与基于均匀假设的另一种分布式MIMO运动目标检测器进行了比较。
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引用次数: 3
Signal processing requirements and uncertainty modeling issues in cooperative vehicular positioning 协同车辆定位中的信号处理要求及不确定性建模问题
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931496
D. Gingras, Evangeline Pollard, D. Gruyer
Accurate and reliable vehicle localization is a key component to numerous applications, including active vehicle safety systems, real time estimation of traffic conditions, and high occupancy tolling. Up to now, most of the localization techniques rely on a given set of sensors embedded in a single vehicle. In this paper, we survey the issues considered in designing collaborative methods for localizing vehicles on roads using information coming from neighbor vehicles as well as from fixed infrastructures. We will in particular examine the signal processing issues and uncertainty modeling in estimating the relative ranges and angles of vehicles and the vehicles' position from noisy measurements.
准确可靠的车辆定位是许多应用的关键组成部分,包括主动车辆安全系统、交通状况实时估计和高占用收费。到目前为止,大多数定位技术都依赖于嵌入在单个车辆中的一组给定传感器。在本文中,我们调查了在设计协作方法时考虑的问题,该方法利用来自相邻车辆和固定基础设施的信息来定位道路上的车辆。我们将特别研究信号处理问题和不确定性建模在估计车辆的相对距离和角度和车辆的位置从噪声测量。
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引用次数: 7
Turbo multiuser detectors for IDMA-based underwater communications 用于基于idma的水下通信的Turbo多用户检测器
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931506
C. Tsimenidis, S. Aliesawi, B. Sharif
In this paper, turbo multiuser detectors in Interleave Division Multiple Access (IDMA) based systems are considered for short range underwater acoustic channels (UACs). In such long reverberant channels that demand high computational complexity, turbo detectors based on minimum mean square error (MMSE) criterion are an attractive solution to achieve a good balance between performance and complexity. Two different synchronous IDMA structures are studied and applied to signals acquired during sea trials in the North Sea; firstly, a channel estimation (CE) based IDMA with Rake reception, and secondly, an adaptive interference canceller (IC-IDMA). Both schemes include phase tracking, channel coding and are based on a chip-rate equalization and detection, which are fed in by a composite multiuser signal of the users' feedback soft information. Experimental results of three different channel ranges demonstrate that the direct adaptive receiver has better performance and additionally mitigates the errors associated with the CE based IDMA receiver while maintaining lower complexity.
本文研究了基于交错分多址(IDMA)系统中的turbo多用户检测器在短距离水声信道(UACs)中的应用。在这种需要高计算复杂度的长混响通道中,基于最小均方误差(MMSE)准则的涡轮检测器是实现性能和复杂度之间良好平衡的一种有吸引力的解决方案。研究了两种不同的同步IDMA结构,并将其应用于北海海试中获得的信号;首先是一种基于信道估计(CE)的Rake接收IDMA,其次是一种自适应干扰抵消(IC-IDMA)。这两种方案都包括相位跟踪、信道编码和基于芯片率均衡和检测,并由用户反馈软信息组成的复合多用户信号馈入。三种不同信道范围的实验结果表明,直接自适应接收机具有更好的性能,在保持较低的复杂度的同时,还能减轻基于CE的IDMA接收机的相关误差。
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引用次数: 0
An efficient fast integer DCT transform for images compression with 16 additions only 一个有效的快速整数DCT变换图像压缩与16加法只有
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931415
Nabila Brahimi, S. Bouguezel
A new fast matrix is introduced for the discrete cosine transform (DCT), an important transform that is of particular interest in image compression. For an 8-point DCT only 16 additions are required by appropriately introducing some zeros in the 8×8 Signed DCT (SDCT) matrix taking into account the orthogonality conditions. The second originality of this work is the development of a suitable quantization matrix suitable for our proposed transform matrix. This quantization matrix improves the peak signal to noise ratio (PSNR) by about 0.7 dB compared to the JPEG quantization matrix.
引入了一种新的快速矩阵用于离散余弦变换(DCT),这是图像压缩中特别感兴趣的重要变换。对于8点DCT,考虑到正交性条件,通过在8×8有符号DCT (SDCT)矩阵中适当地引入一些零,只需要16个加法。这项工作的第二个独创性是开发了一个适合于我们提出的变换矩阵的合适的量化矩阵。与JPEG量化矩阵相比,该量化矩阵将峰值信噪比(PSNR)提高了约0.7 dB。
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引用次数: 14
An improper random vector approach for ESPRIT and unitary ESPRIT frequency estimation 一种不合适的ESPRIT随机向量方法和单一ESPRIT频率估计
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931478
G. Bouleux, Thameur Kidar, F. Guillet
The problem of estimating the frequencies of a complex signal corrupted by noise is addressed in this paper. Solving the problem by a subspace approach induce an inevitable maximum overlap between windowed observation vectors. It appears therefore that traditional second order statistics do not describe totally the second order behavior and the notion of improper random vector is recommended. Based on this, we analyze an ESPRIT and a Unitary ESPRIT-based methods established with improper random vectors assumption. Numerical simulations and a real application are brought for embellishing the discussion.
本文研究了受噪声干扰的复杂信号的频率估计问题。用子空间方法求解问题会导致窗口观测向量之间不可避免的最大重叠。因此,传统的二阶统计量不能完全描述二阶行为,建议使用不适当随机向量的概念。在此基础上,我们分析了一种基于ESPRIT的方法,以及在不适当的随机向量假设下建立的基于统一ESPRIT的方法。最后给出了数值模拟和实际应用。
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引用次数: 1
Elliptic Curve Cryptography and its applications 椭圆曲线密码及其应用
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931464
M. Amara, Amar Siad
The idea of Elliptic Curve Cryptography (ECC), and how it's a better promise for a faster and more secure method of encryption in comparison to the current standards in the Public-Key Cryptographic algorithms of RSA is discussed in this paper. The Elliptic Curve Cryptography covers all relevant asymmetric cryptographic primitives like digital signatures and key agreement algorithms. The function used for this purpose is the scalar multiplication k.P which is the core operation of ECCs. Where k is an integer and P is a point on an elliptic curve. This article explains the role of ECC in the network security. ECC's uses with smaller keys to provide high security and high speed.
本文讨论了椭圆曲线加密(ECC)的思想,以及与RSA公钥加密算法中的现行标准相比,它如何更好地承诺提供更快、更安全的加密方法。椭圆曲线密码学涵盖了所有相关的非对称密码学原语,如数字签名和密钥协议算法。用于此目的的函数是标量乘法kp,它是ecc的核心操作。k是一个整数,P是椭圆曲线上的一个点。本文阐述了ECC在网络安全中的作用。ECC使用更小的密钥来提供高安全性和高速度。
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引用次数: 92
LSF-CMA based blind equalization algorithms for MC-CDMA systems 基于LSF-CMA的MC-CDMA系统盲均衡算法
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931452
A. B. Djebbar
In this paper, a new blind equalization for multiuser multi-carrier code division multiple access (MC-CDMA) systems under Rayleigh multipath fading channel is proposed. The later causes the ICI and ISI that destroy the relationship of the guard interval (GI) redundancy. Through exploiting the structural properties of MC-CDMA transmitted signal, the estimation can be resolved using least square fitting (LSF) and subspace approaches. Indeed, GI redundancy together with excess codes (EC) are used to restore the MC-CDMA properties. In addition, we propose the use of the previous algorithms in conjunction with a constant modulus algorithm (CMA) to improve the performance gain. Our simulation results show the robustness and effectiveness of the proposed algorithms.
针对瑞利多径衰落信道下的多用户多载波码分多址(MC-CDMA)系统,提出了一种新的盲均衡方法。后者导致ICI和ISI,破坏了GI冗余的关系。通过利用MC-CDMA传输信号的结构特性,利用最小二乘拟合和子空间方法解决了估计问题。实际上,GI冗余和多余码(EC)被用来恢复MC-CDMA的特性。此外,我们建议将先前的算法与恒模算法(CMA)结合使用,以提高性能增益。仿真结果表明了所提算法的鲁棒性和有效性。
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引用次数: 1
Low cost DOA estimation for wideband sources 宽带源的低成本DOA估计
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931423
A. Ouamri
This paper presents a temporal method for direction of arrival (DOA) estimation for wideband sources by using an antenna array. Existing DOA estimation algorithms treat the problem in frequency domain by decomposing the wide spectrum of these signals in several narrowband signals, and use a narrowband DOA estimation methods to solve the problem. These methods suffer from high computational complexity. This paper introduces a temporal method based on cross-correlation functions between sensors outputs. The estimation of the propagation delays is the key to find directions of arrival of wideband sources. The method has low cost complexity in terms of computations and sensors number. In this paper we describe the method and we do some comparative simulations to show the performance of the suggested method.
提出了一种利用天线阵估计宽带源到达方向(DOA)的时域方法。现有的DOA估计算法在频域上将这些信号的宽频谱分解成若干个窄带信号,并使用窄带DOA估计方法来解决问题。这些方法的计算复杂度很高。本文介绍了一种基于传感器输出间互相关函数的时序方法。传播时延的估计是确定宽带源到达方向的关键。该方法在计算量和传感器数量方面具有较低的成本复杂度。在本文中,我们描述了该方法,并进行了一些比较仿真来证明该方法的性能。
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引用次数: 0
A Newton-like algorithm for adaptive multi-modulus blind equalization 自适应多模盲均衡的类牛顿算法
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931474
K. N. Paracha, A. Zerguine
This work concentrates on the development of a Newton-like algorithm for blind equalization. This algorithm is obtained by applying a complex Taylor series on a recently proposed soft constraint satisfaction multi-modulus blind equalization algorithm of order p (SCS-MMA-p). The proposed algorithm is a generalized version of the SCS-MMA-p. This algorithm is called stochastic Newton-like soft constraint satisfaction multi-modulus algorithm of order p (SNL-SCS-MMA-p). Simulation results carried out, on both baud spaced and fractionally-spaced equalizers, to assess the performance of the prosed algorithm reveal great improvement in performance of the proposed algorithm against that of the SCS-MMA for different values of the parameter p.
本工作集中于开发一种类似牛顿的盲均衡算法。该算法通过对最近提出的p阶软约束满足多模盲均衡算法(SCS-MMA-p)应用复泰勒级数得到。提出的算法是SCS-MMA-p的广义版本。该算法称为p阶随机类牛顿软约束满足多模算法(SNL-SCS-MMA-p)。在波特间隔和分数间隔均衡器上进行的仿真结果表明,在不同的参数p值下,所提算法的性能比SCS-MMA有很大的提高。
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引用次数: 3
Parameterized FPGA-based architecture for parallel 1-D filtering algorithms 基于参数化fpga的并行一维滤波算法
Pub Date : 2011-05-09 DOI: 10.1109/WOSSPA.2011.5931443
S. Hasan, S. Boussakta, Alexandre Yakovlev
Parallel 1-D signal filtering algorithm is implemented as a parameterized efficient FPGA-based architecture using Xilinx System Generator. The implemented algorithm is a linear indirect filters achieved by a parallel FFT/point-by-point complex inner product/ IFFT convolution unit array. The implemented architecture manifests a 38 % higher performance per Watt at maximum frequency. The parameterized implementation provides rapid system-level FPGA prototyping and operating frequency portability. Consequently, the results are obtained independent of the two targeted Virtex-6 FPGA boards, namely xc6vlX240Tl–1lff1759 and xc6vlX130Tl–1lff1156, to achieve lower power consumption of (1.6 W) and down to (0.99 W) respectively at a maximum frequency of up to (216 MHz). A case study of real-time speech filtering shows excellent performance results of power consumption down to (0.99W) at maximum frequency of up to (216 MHz).
采用Xilinx System Generator实现了一种参数化的高效fpga并行一维信号滤波算法。所实现的算法是由并行FFT/逐点复内积/ IFFT卷积单元阵列实现的线性间接滤波器。实现的架构在最高频率下每瓦性能提高38%。参数化实现提供了快速的系统级FPGA原型和工作频率可移植性。因此,结果是独立于两个目标Virtex-6 FPGA板(xc6vlX240Tl-1lff1759和xc6vlX130Tl-1lff1156)获得的,在最高频率高达(216 MHz)的情况下,功耗分别降低到(1.6 W)和(0.99 W)。实时语音滤波的实例研究表明,在最大频率高达(216 MHz)的情况下,功耗低至(0.99W),具有优异的性能。
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引用次数: 16
期刊
International Workshop on Systems, Signal Processing and their Applications, WOSSPA
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