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2017 IEEE 7th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)最新文献

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Weighted sum rate maximization for non-regenerative multi-way relay channels with multi-user decoding 具有多用户解码的非再生多路中继信道加权和速率最大化
Bho Matthiesen, Eduard Axel Jorswieck
This paper studies the maximization of the weighted sum rate in multi-way relay channels with simultaneous non-unique decoding at the receivers. We state the resource allocation problem as a global optimization problem of the transmit powers and achievable rates, and transform it into a monotonic optimization problem. The computational complexity of monotonic optimization problems is exponential in the number of variables. We observe that for fixed powers the problem is a linear program with much lower complexity and exploit this structural property by decomposing the optimization problem into an inner linear and an outer monotonic program. This reduces the computational complexity significantly and allows computing the global solution. We compare the achievable throughput with multi-user decoding and optimal power allocation numerically to state-of-the-art single-user decoding and to simply transmitting at maximum power. We observe that multi-user decoding performs much better than single-user decoding in terms of throughput and fairness for medium to high SNRs.
研究了接收端同时非唯一译码的多路中继信道中加权和率的最大化问题。我们将资源分配问题表述为传输功率和可达速率的全局优化问题,并将其转化为单调优化问题。单调优化问题的计算复杂度与变量数量呈指数关系。我们观察到,对于定幂问题是一个复杂度低得多的线性规划,并通过将优化问题分解为一个内线性规划和一个外单调规划来利用这一结构性质。这大大降低了计算复杂度,并允许计算全局解决方案。我们将多用户解码和最佳功率分配的可实现吞吐量与最先进的单用户解码和最大功率传输进行了数值比较。我们观察到,在吞吐量和公平性方面,多用户解码比单用户解码在中高信噪比方面表现得更好。
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引用次数: 3
Recursive estimation of time-varying RSS fields based on crowdsourcing and Gaussian processes 基于众包和高斯过程的时变RSS域递归估计
Irene Santos, J. J. Murillo-Fuentes, P. Djurić
In this paper, we deal with the estimation of received signal strength (RSS) in a time-varying spatial field, where only low accuracy measurements and noisy locations of users are available. The spatial field is defined on a fixed grid of nodes with perfectly known locations. We employ a propagation model where the path loss exponent and the transmitter power are unknown, and where the locations of the reporting users are estimates and thereby with errors. We propose to estimate time-varying RSS fields by a recursive Bayesian approach that operates on data of low accuracy and obtained by crowdsourcing. The method is based on Gaussian processes, and it produces as a result the complete joint distribution of the unknowns. We also inject a forgetting factor that reduces the effect of old information on current estimates. Our method summarizes all the acquired information, keeping the memory size needed for estimation fixed, i.e., making it independent from the number of sensing users. We also present the Cramér-Rao bound (CRB) of the estimated parameters. Finally, we illustrate the performance of our method with some experimental results.
在本文中,我们处理时变空间场中接收信号强度(RSS)的估计,其中只有低精度的测量和用户的噪声位置可用。空间场被定义在一个节点的固定网格上,这些节点具有完全已知的位置。我们采用了一种传播模型,其中路径损耗指数和发射机功率是未知的,其中报告用户的位置是估计的,因此存在误差。我们建议通过递归贝叶斯方法来估计时变的RSS字段,该方法处理通过众包获得的低精度数据。该方法是基于高斯过程的,它产生的结果是未知数的完整联合分布。我们还注入了一个遗忘因子,以减少旧信息对当前估计的影响。我们的方法总结了所有获取的信息,保持估计所需的内存大小固定,即使其独立于感知用户的数量。给出了估计参数的cram r- rao界(CRB)。最后,用实验结果说明了该方法的有效性。
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引用次数: 1
Penalty-Based multitask estimation with non-local linear equality constraints 非局部线性等式约束下基于惩罚的多任务估计
Fei Hua, Roula Nassif, C. Richard, Haiyan Wang
We consider distributed estimation problems over multitask networks where the parameter vectors at distinct agents are coupled via a set of linear equality constraints. Unlike previous existing works, the current work assumes that each constraint involves agents that are not necessarily one-hop neighbors. At each time instant, we assume that each agent has access to the instantaneous estimates of its one-hop neighbors and to the past estimates of its multi-hop neighbors through a multi-hop relay protocol. A distributed penalty-based algorithm is then derived and its performance analyses in the mean and in the mean-square-error sense are provided. Simulation results show the effectiveness of the strategy and validate the theoretical models.
我们考虑了多任务网络上的分布式估计问题,其中不同agent上的参数向量通过一组线性等式约束耦合。与以前的工作不同,当前的工作假设每个约束都涉及不一定是单跳邻居的代理。在每个时间瞬间,我们假设每个代理都可以通过多跳中继协议访问其单跳邻居的瞬时估计和其多跳邻居的过去估计。然后推导了一种基于分布式惩罚的算法,并对其在均值和均方误差意义上的性能进行了分析。仿真结果表明了该策略的有效性,验证了理论模型的正确性。
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引用次数: 6
Nonlinear least squares algorithm for canonical polyadic decomposition using low-rank weights 正则多进分解的非线性最小二乘算法
Martijn Boussé, L. D. Lathauwer
The canonical polyadic decomposition (CPD) is an important tensor tool in signal processing with various applications in blind source separation and sensor array processing. Many algorithms have been developed for the computation of a CPD using a least squares cost function. Standard least-squares methods assumes that the residuals are uncorrelated and have equal variances which is often not true in practice, rendering the approach suboptimal. Weighted least squares allows one to explicitly accommodate for general (co)variances in the cost function. In this paper, we develop a new nonlinear least-squares algorithm for the computation of a CPD using low-rank weights which enables efficient weighting of the residuals. We briefly illustrate our algorithm for direction-of-arrival estimation using an array of sensors with varying quality.
正则多进分解(CPD)是信号处理中重要的张量工具,在盲源分离和传感器阵列处理中有着广泛的应用。使用最小二乘代价函数计算CPD的算法有很多。标准最小二乘法假设残差是不相关的,并且具有相等的方差,这在实践中往往是不正确的,使得该方法不是最优的。加权最小二乘允许人们显式地适应成本函数中的一般(co)方差。在本文中,我们开发了一种新的非线性最小二乘算法来计算CPD,该算法使用低秩权值,可以有效地对残差进行加权。我们简要地说明了我们的算法的到达方向估计使用阵列的传感器与不同的质量。
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引用次数: 7
Efficient recovery from noisy quantized compressed sensing using generalized approximate message passing 利用广义近似消息传递从噪声量化压缩感知中有效恢复
O. Musa, Gabor Hannak, N. Goertz
Compressed sensing (CS) is a novel technique that allows for stable reconstruction with sampling rate lower than Nyquist rate if the unknown vector is sparse. In many practical applications CS measurements are first scalar quantized and later corrupted in different ways. Reconstruction by conventional techniques on such highly distorted measurements will result in poor accuracy. To address this problem, we use the well established generalized approximate message passing (GAMP) algorithm and tailor it for quantized CS measurements corrupted with noise. We provide the necessary expressions for the nonlinear updates for different noise models, namely the symmetric discrete memoryless channel (SDMC) and the additive white Gaussian noise (AWGN) channel. Numerical results show superiority of the GAMP algorithm compared to conventional reconstruction algorithms in both SDMC and AWGN channels.
压缩感知(CS)是一种新的技术,它可以在采样率低于奈奎斯特率的情况下实现未知向量的稳定重构。在许多实际应用中,CS测量首先是标量量子化,然后以不同的方式损坏。在这种高度失真的测量上,用传统技术进行重建将导致精度差。为了解决这个问题,我们使用了完善的广义近似消息传递(GAMP)算法,并对其进行了定制,以适应被噪声破坏的量化CS测量。给出了对称离散无记忆信道(SDMC)和加性高斯白噪声信道(AWGN)两种不同噪声模型的非线性更新的必要表达式。数值结果表明,在SDMC和AWGN信道中,GAMP算法都比传统的重构算法具有优越性。
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引用次数: 2
Joint low-rank and sparse based image reconstruction for through-the-wall radar imaging 基于联合低秩稀疏的穿墙雷达成像图像重建
F. Tivive, A. Bouzerdoum
Through-the-wall radar uses electromagnetic waves to detect and discern targets behind opaque obstacles, such as doors and walls. Wall clutter mitigation and scene reconstruction are performed to produce the image of the behind-the-wall scene. These two problems, however, are often addressed separately, which may result in a suboptimal solution. In this paper, the wall clutter removal and image formation are unified as a joint low-rank and sparsity constrained optimization problem, which is solved using augmented Lagrange multiplier method. Experimental results shows that the proposed method produces clearer images than the existing method that uses a wall clutter mitigation method in conjunction with backprojection method for imaging.
穿墙雷达利用电磁波探测和识别不透明障碍物(如门和墙)后面的目标。对墙杂波进行抑制和场景重建,生成墙后场景的图像。然而,这两个问题通常是分开处理的,这可能会导致次优解决方案。本文将墙体杂波去除和图像形成统一为一个联合的低秩稀疏约束优化问题,采用增广拉格朗日乘子法进行求解。实验结果表明,该方法比现有的墙杂波抑制方法与反向投影方法相结合的成像方法产生的图像更清晰。
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引用次数: 0
Bi-Linear modeling of manifold-data geometry for Dynamic-MRI recovery 动态mri恢复的流形数据几何双线性建模
K. Slavakis, Gaurav N. Shetty, Abhishek Bose, Ukash Nakarmi, L. Ying
This paper establishes a modeling framework for data located onto or close to (unknown) smooth manifolds, embedded in Euclidean spaces, and considers its application to dynamic magnetic resonance imaging (dMRI). The framework comprises several modules: First, a set of landmark points is identified to describe concisely a data cloud formed by highly under-sampled dMRI data, and second, low-dimensional renditions of the landmark points are computed. Searching for the linear operator that decompresses low-dimensional data to high-dimensional ones, and for those combinations of landmark points which approximate the manifold data by affine patches, leads to a bi-linear model of the dMRI data, cognizant of the intrinsic data geometry. Preliminary numerical tests on synthetically generated dMRI phantoms, and comparisons with state-of-the-art reconstruction techniques, underline the rich potential of the proposed method for the recovery of highly under-sampled dMRI data.
本文建立了一个位于或接近(未知)光滑流形上的数据的建模框架,嵌入在欧几里得空间中,并考虑了其在动态磁共振成像(dMRI)中的应用。该框架包括几个模块:首先,识别一组地标点,以简洁地描述由高度欠采样的dMRI数据形成的数据云;其次,计算地标点的低维再现。寻找将低维数据解压缩为高维数据的线性算子,以及通过仿射斑块近似流形数据的地标点的组合,导致dMRI数据的双线性模型,认识到固有的数据几何。对合成生成的dMRI幻影进行初步数值测试,并与最先进的重建技术进行比较,强调了所提出的恢复高度欠采样dMRI数据的方法的丰富潜力。
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引用次数: 1
Network estimation via poisson autoregressive models 基于泊松自回归模型的网络估计
B. Mark, Garvesh Raskutti, R. Willett
Multivariate Poisson autoregressive models are a common way of capturing self-exciting point processes, where cascading series of events from nodes in a network either stimulate or inhibit events from other nodes. These models can be used to learn the structure of social or biological neural networks. An important problem associated with these multivariate network models is determining how different nodes influence each other. This problem presents a number of technical challenges since the number of nodes is typically large relative to the number of observed events. This paper addresses these challenges and provides learning rates for a class of multivariate self-exciting Poisson autoregressive models. Importantly, the derived learning rates apply in the high-dimensional setting when our network is sparse. We also provide a real data example to support our methodology and main results.
多元泊松自回归模型是捕获自激点过程的常用方法,其中来自网络节点的级联事件系列刺激或抑制来自其他节点的事件。这些模型可以用来学习社会或生物神经网络的结构。与这些多变量网络模型相关的一个重要问题是确定不同节点如何相互影响。这个问题提出了许多技术挑战,因为相对于观察到的事件的数量,节点的数量通常很大。本文解决了这些挑战,并提供了一类多元自激泊松自回归模型的学习率。重要的是,当我们的网络是稀疏的时候,导出的学习率适用于高维设置。我们还提供了一个真实的数据示例来支持我们的方法和主要结果。
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引用次数: 4
Adaptive target tracking using multistatic sensor with unknown moving transmitter positions 未知移动发射机位置的多静态传感器自适应目标跟踪
Rong Yang, Y. Bar-Shalom
It is desirable for a sensor to keep silent to avoid being detected. Passive tracking is therefore preferred as it estimates target trajectories through “listening” to the signals emitted by others without any emission. The multistatic concept can be used for this application, where the receiver (or the listener) is considered as own sensor, and the transmitters can be emitters deployed on stationary or moving platforms. Such a multistatic system requires the positions of the transmitters to be known by the receiver. Unfortunately, this is not always true for non-cooperative transmitters (especially for moving transmitters), who do not inform the receiver their positions timely. This paper proposes a multistatic configuration with a receiver and two transmitters with unknown position. This configuration can provide good observability for the trajectories of the transmitters and targets based on the measured bearings and the time-difference-of-arrival (TDOA) of the direct and indirect path signals. A two-stage unscented Kalman filter (UKF) is developed to track the transmitters and target simultaneously. Unlike the algorithms from the literature which assume known transmitter positions, the algorithm of this paper estimates the state of the target while adapting itself to the moving transmitters' locations. Simulation tests are conducted to show the filter performance.
为了避免被检测到,传感器最好保持沉默。因此,被动跟踪是首选的,因为它通过“倾听”其他发射的信号来估计目标轨迹,而没有任何发射。多静态概念可用于此应用,其中接收器(或侦听器)被视为自己的传感器,发射器可以是部署在固定或移动平台上的发射器。这样的多静态系统要求接收器知道发射机的位置。不幸的是,对于不合作的发射机(特别是移动的发射机),这并不总是正确的,因为它们不及时通知接收器它们的位置。本文提出了一种位置未知的接收机和发射机多静态结构。基于测量的方位和直接和间接路径信号的到达时间差(TDOA),该配置可以为发射机和目标的轨迹提供良好的可观测性。提出了一种两级无嗅卡尔曼滤波器(UKF),用于同时跟踪发射机和目标。与文献中假设已知发射机位置的算法不同,本文算法在适应移动发射机位置的同时估计目标的状态。通过仿真实验验证了该滤波器的性能。
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引用次数: 1
Operational characteristics of wigner-ville accelerating target detector 维格纳-维尔加速目标探测器的工作特性
Y. Abramovich, G. S. Antonio, Stephen T. Mondschein
Accelerating targets need to be detected, estimated, and (if strong enough) removed from input data for weak target detection. In this paper, we derive analytical expressions for probability of false alarm and detection of the non-linear detector (suggested in [1]) for accelerating targets based on Wigner-Ville transformation. Simulation results validate the derived formulas and demonstrate relatively high performance of the Winger-Ville detector.
加速目标需要被检测、估计,并且(如果足够强的话)从输入数据中移除,用于弱目标检测。本文基于Wigner-Ville变换,推导了加速目标非线性检测器([1])的虚警概率和检测的解析表达式。仿真结果验证了推导公式的正确性,并证明了Winger-Ville探测器具有较高的性能。
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引用次数: 0
期刊
2017 IEEE 7th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)
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