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2023 IEEE Statistical Signal Processing Workshop (SSP)最新文献

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Online Learning Network Methods for a Joint Transmit Waveform and Receive Beamforming Design for a DFRC System DFRC系统发射波形和接收波束成形联合设计的在线学习网络方法
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10207956
Jiachao Liang, Yongwei Huang
Consider a joint optimal transmit waveform and receive beamforming design problem for a dual-functional radar and communication (DFRC) system. The DFRC base station sends signals to communicate with the downlink users while detecting a multiple-input multiple-output radar target. The system performance is evaluated by an affine combination between the communication multi-user interference energy and the reciprocal of the radar output signal-to-interference-plus-noise ratio. Then a joint minimization problem of the affine function is formulated, subject to constant modulus constraints. This is a typical nonconvex optimization problem. In the paper, we propose a new online learning network (OLN) scheme to solve it, by setting proper trainable network parameters, formulating a loss function, and selecting a suitable learning rate for the OLN. Simulation results are presented to demonstrate the higher performance for the DFRC system by the proposed OLN method than that by a traditional optimization method.
考虑双功能雷达与通信(DFRC)系统的联合最优发射波形和接收波束形成设计问题。DFRC基站在检测多输入多输出雷达目标时发送信号与下行链路用户通信。通过通信多用户干扰能量与雷达输出信噪比倒数之间的仿射组合来评估系统性能。然后给出了仿射函数在常模约束下的联合极小化问题。这是一个典型的非凸优化问题。本文提出了一种新的在线学习网络(OLN)方案,通过设置合适的可训练网络参数,制定损失函数,并为OLN选择合适的学习率来解决这个问题。仿真结果表明,与传统的优化方法相比,该方法具有更高的性能。
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引用次数: 0
Channel Estimation and Physical Layer Security in Optical MIMO-OFDM based LED Index Modulation 基于MIMO-OFDM的LED指数调制的信道估计和物理层安全
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10208079
Furkan Batuhan Okumus, E. Panayirci, M. Khalighi
In this paper, we propose a new and low-complexity channel estimation algorithm for the generalized LED index modulation (GLIM), recently proposed for visible-light communication systems based on multi-input multi-output (MIMO) and orthogonal frequency-division multiplexing (OFDM). For this scheme, denoted by GLIM-OFDM, we investigate the bit-error rate (BER), the mean-square error (MSE) of channel estimation, as well as the Cramer-Rao bound on the latter. Furthermore, we present a novel physical layer security (PLS) technique for the GLIM-OFDM scheme using precoding at the transmitter assuming it has the channel state information (CSI) between the LEDs and a legitimate user, but no knowledge of the CSI corresponding to eavesdroppers. The efficiency of the proposed PLS technique is demonstrated through numerical results.
本文提出了一种新的低复杂度信道估计算法,用于基于多输入多输出(MIMO)和正交频分复用(OFDM)的可见光通信系统的广义LED指数调制(GLIM)。对于这种称为gim - ofdm的方案,我们研究了信道估计的误码率(BER)、均方误差(MSE)以及后者的Cramer-Rao界。此外,我们提出了一种新的物理层安全(PLS)技术,用于在发射器上使用预编码,假设它在led和合法用户之间具有信道状态信息(CSI),但不知道与窃听者对应的CSI。数值结果验证了该方法的有效性。
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引用次数: 0
Full-Duplex Cooperative NOMA Short-Packet Communications with K-Means Clustering 基于k均值聚类的全双工协同NOMA短包通信
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10208051
T. Chu, H. Zepernick, T. Duong
Fifth-generation (5G) and future sixth-generation (6G) mobile networks aim at offering ultra-reliable, low-latency, and massive machine-type communications. In this context, this paper studies full-duplex (FD) cooperative non-orthogonal multiple access (C-NOMA) short-packet communications (SPC) with K-means clustering of user equipment regarding block error rate (BLER) and sum rate. Analytical expressions are derived for the BLER and sum rate allowing to assess the performance of the considered system. The numerical results reveal the benefits of the FD C-NOMA SPC system, illustrate trade-offs between BLER and sum rate, and show the impact of the transmit signal-to-noise ratio and number of channel uses on the performance.
第五代(5G)和未来的第六代(6G)移动网络旨在提供超可靠、低延迟和大规模机器类型的通信。在此背景下,本文研究了基于分组错误率和求和率的用户设备k均值聚类的全双工(FD)合作非正交多址(C-NOMA)短包通信(SPC)。导出了BLER和总和率的解析表达式,以便评估所考虑的系统的性能。数值结果揭示了FD C-NOMA SPC系统的优点,说明了BLER和求和速率之间的权衡,并显示了发射信噪比和信道数量对性能的影响。
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引用次数: 0
Hard Thresholding based Robust Algorithm for Multiple Measurement Vectors 基于硬阈值的多测量向量鲁棒算法
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10207985
Ketan Atul Bapat, M. Chakraborty
In this paper, we present Simultaneous Lorentzian Iterative Hard Thresholding (SLIHT) algorithm for recovering complex valued, jointly sparse signals corrupted by heavy tailed noise in the multiple measurement vector model in compressed sensing. The proposed algorithm uses Lorentzian norm as the underlying cost function which provides robustness against heavy tailed noise, e.g., impulsive noise. Analysis is carried out for the proposed algorithm using Majorization-Minimization framework and we show that under proper selection of parameters, the proposed SLIHT algorithm produces a sequence of row sparse estimates for which the Lorentzian norm of the residual is non-increasing. Extensive simulation studies are carried out against state of the art methods and it is observed that performance of the proposed algorithm is better or at least at par with the current methods.
本文提出了一种同时洛伦兹迭代硬阈值(SLIHT)算法,用于恢复压缩感知中多重测量向量模型中被重尾噪声破坏的复值联合稀疏信号。该算法使用洛伦兹范数作为潜在的代价函数,提供了对重尾噪声(如脉冲噪声)的鲁棒性。利用最大化最小化框架对所提出的算法进行了分析,结果表明,在适当选择参数的情况下,所提出的SLIHT算法产生了残差洛伦兹范数不增加的行稀疏估计序列。针对最先进的方法进行了广泛的模拟研究,并观察到所提出的算法的性能更好或至少与当前方法相当。
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引用次数: 0
Multivariate Signal Decomposition for Vital Signal Extraction using UWB Impulse Radar 基于多变量信号分解的超宽带脉冲雷达生命信号提取
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10208009
Minhhuy Le, V. Luong, K. Nguyen, Tien Dat Le, Dang-Khanh Le
Remote sensing of vital signals, including respiration and heartbeat, is an important application used in smart homes, smart hospitals, or car driver assistant systems. Ultra-wideband impulse (UWB) radar recently became popular because of its ability to sense tiny motions from breathing and cardiac activities. The heartbeat signal is in order of magnitudes smaller than the respiration signal and is usually buried in a noisy signal. In this research, we propose a multivariate signal decomposition for efficiently extracting the heartbeat signal. The results show that the proposed method significantly improves the accuracy of the signal-to-noise ratio of the heartbeat signal compared to the recent advanced methods such as wavelet transform, singular spectral analysis, and multivariate singular spectral analysis. The proposed method also improves the stability of heartbeat monitoring in real-time applications.
包括呼吸和心跳在内的生命信号的遥感是智能家居、智能医院或汽车驾驶辅助系统的重要应用。超宽带脉冲(UWB)雷达最近变得流行,因为它能够感知呼吸和心脏活动的微小运动。心跳信号比呼吸信号小一个数量级,通常被淹没在噪声信号中。在这项研究中,我们提出了一种多变量信号分解方法来有效地提取心跳信号。结果表明,与小波变换、奇异谱分析和多元奇异谱分析等先进方法相比,该方法显著提高了心跳信号信噪比的准确性。该方法还提高了实时应用中心跳监测的稳定性。
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引用次数: 0
Estimation of Statistical Manifold Properties of Natural Sequences using Information Topology 利用信息拓扑估计自然序列的统计流形性质
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10207948
A. Back, Janet Wiles
Modeling unknown natural sequences is a challenging area. Here we consider an information theoretic approach for analyzing probabilistic natural sequences in the context of synthetic languages, which are characterized by having no available language models. Based on the notion of efficient short-term entropy estimators, we examine the concept of extending information geometry to information topology as a method of characterizing natural sequences. A normalized relative difference entropy method is described, which is required to apply the technique to sub-word models derived from natural sequences. Visualization of information topological spaces is considered, and some aspects are considered for future work. The approach is shown to provide potential as a new method for modeling the probabilistic structure of synthetic language sequences.
建模未知的自然序列是一个具有挑战性的领域。本文考虑了一种信息理论方法来分析没有可用语言模型的合成语言环境下的概率自然序列。基于有效短期熵估计的概念,我们研究了将信息几何扩展到信息拓扑的概念,作为表征自然序列的一种方法。描述了一种归一化相对差熵方法,该方法需要将该技术应用于自然序列衍生的子词模型。研究了信息拓扑空间的可视化,并对今后的工作进行了展望。该方法为合成语言序列的概率结构建模提供了一种新的方法。
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引用次数: 0
Unified asymptotic distribution of subspace projectors in complex elliptically symmetric models 复椭圆对称模型中子空间投影的统一渐近分布
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10208085
J. Delmas, H. Abeida
The statistical performance of subspace-based algorithms depends on the deterministic and stochastic statistical model of the noisy linear mixture of the data, the estimate of the projector, and the algorithm that estimates the parameters from the projector. This paper presents different circular and non-circular complex elliptically symmetric (CES) models of the data and different associated non-robust and robust covariance estimators whose asymptotic distributions are derived. This allows us to unify and complement the asymptotic distribution of subspace projectors adapted to these models and to prove several invariance properties that have impacts on the parameters to be estimated in CES data models.
基于子空间的算法的统计性能取决于数据的噪声线性混合的确定性和随机统计模型、投影器的估计以及从投影器估计参数的算法。本文给出了数据的不同圆形和非圆形复椭圆对称(CES)模型以及相关的不同非鲁棒和鲁棒协方差估计,并给出了它们的渐近分布。这使我们能够统一和补充适用于这些模型的子空间投影的渐近分布,并证明对CES数据模型中待估计参数有影响的几个不变性。
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引用次数: 0
A Strictly Bounded Deep Network for Unpaired Cyclic Translation of Medical Images 医学图像非配对循环翻译的严格有界深度网络
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10207960
Swati Rai, Jignesh S. Bhatt, S. K. Patra
Medical image translation is an ill-posed problem. Unlike existing networks, we consider unpaired medical images as input, and provide a strictly bound generative network that yields a stable cyclic (bidirectional) translation. It consists of two cyclically connected conditional GANs where both generators (32 layers each) are conditioned with concatenation of alternate unpaired patches from input and target images of the same organ. The key idea is to exploit cross-neighborhood contextual feature information to bound translation space and boost generalization. Further, the generators are equipped with adaptive dictionaries which are learned from the cross-contextual patches to reduce possible degradation. Discriminators are 15-layer deep networks which employ minimax function to validate the translated imagery. A combined loss function is formulated with adversarial, non-adversarial, forward-backward cyclic, and identity losses that further minimize variance of the proposed learning machine. Qualitative, quantitative, and ablation analysis show superior results on real CT and MRI datasets.
医学图像翻译是一个不适定问题。与现有的网络不同,我们考虑未配对的医学图像作为输入,并提供一个严格约束的生成网络,产生稳定的循环(双向)翻译。它由两个循环连接的条件gan组成,其中两个生成器(每个32层)由来自同一器官的输入和目标图像的交替未配对补丁拼接而成。关键思想是利用跨邻域上下文特征信息来约束翻译空间,提高泛化能力。此外,生成器配备了自适应字典,这些字典从跨上下文补丁中学习,以减少可能的退化。鉴别器是采用极大极小函数对翻译图像进行验证的15层深度网络。组合损失函数由对抗性、非对抗性、前向向后循环和身份损失组成,这些损失进一步最小化了所提出的学习机的方差。定性、定量和消融分析在真实的CT和MRI数据集上显示出优越的结果。
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引用次数: 0
Disturbance Rejection for Robust Distributed Learning via Time-Vertex Filtering 基于时间顶点滤波的鲁棒分布式学习干扰抑制
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10208077
Xiaoyu Sui, Zhenlong Xiao, S. Tomasin
Distributed learning has attracted considerable interests in literatures because the collaborations of multiple agents would help to solve complicated engineering problems. Robustness issue plays an important role in distributed learning since attacks on agents would strongly affect the convergence performance and even lead the collaboration to an incorrect global solution. In this paper, we consider the attacks as disturbance and propose a joint time-graph filtering to defend against the attacks in distributed learning. The coefficients of joint filtering can be determined based on the coefficients of time-domain and graph-domain filters that are designed separately. If there is no attack in distributed learning, the joint time-graph filtering can also contribute to the convergence performance acceleration. Numerical studies demonstrate that the joint filtering in both time domain and graph domain can defend against attacks with noise and outperforms several existing algorithms.
分布式学习因其多智能体之间的协作有助于解决复杂的工程问题而引起了广泛的关注。鲁棒性问题在分布式学习中起着重要的作用,因为对智能体的攻击会严重影响收敛性能,甚至导致协作得到不正确的全局解决方案。在本文中,我们将攻击视为干扰,并提出了一种联合时间图过滤来防御分布式学习中的攻击。联合滤波的系数可以在分别设计时域和图域滤波器系数的基础上确定。如果在分布式学习中没有攻击,联合时间图滤波也有助于加速收敛性能。数值研究表明,时域和图域联合滤波可以抵御噪声攻击,优于现有的几种算法。
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引用次数: 0
Automatic Quantification of Lung Infection Severity in Chest X-ray Images 胸部x线图像中肺部感染严重程度的自动量化
Pub Date : 2023-07-02 DOI: 10.1109/SSP53291.2023.10207986
Bouthaina Slika, F. Dornaika, K. Hammoudi, Vinh Truong Hoang
A large number of well-maintained datasets are needed for the diagnosis and assessment of the severity of the new disease (COVID-19) using chest radiographs (CXR). To achieve the best results, current methods for quantifying severity require complex methods and large datasets for training. Medical professionals must have access to systems that can quickly and automatically identify COVID-19 patients and predict severity. In this work, we measure the severity of COVID-19 using an efficient neural network consisting of a CNN backbone and a regression head to automatically predict lung infection scores. In addition, we investigate the efficiency of some augmentation methods to increase the potential of the deep model. A comparative study was conducted using several state-of-the-art deep learning methods on the public RALO dataset. The experimental results show that our model has the potential to perform best on severity quantification tasks and demonstrate the impact of lung segmentation on performance.
使用胸片(CXR)诊断和评估新疾病(COVID-19)的严重程度需要大量维护良好的数据集。为了达到最佳效果,目前量化严重性的方法需要复杂的方法和大型数据集进行训练。医疗专业人员必须能够访问能够快速自动识别COVID-19患者并预测严重程度的系统。在这项工作中,我们使用由CNN主干和回归头组成的高效神经网络来测量COVID-19的严重程度,以自动预测肺部感染评分。此外,我们还研究了一些增强方法的效率,以增加深度模型的潜力。在公共RALO数据集上使用几种最先进的深度学习方法进行了比较研究。实验结果表明,我们的模型有潜力在严重性量化任务中表现最好,并证明了肺分割对性能的影响。
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引用次数: 0
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2023 IEEE Statistical Signal Processing Workshop (SSP)
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