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Fast Converging Algorithm for Blind Equalization With Gaussian and Impulsive Noises 含高斯噪声和脉冲噪声的盲均衡快速收敛算法
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-09 DOI: 10.1109/TSP.2025.3525663
Jin Li;Wei Xing Zheng;Long Yang
This paper proposes a blind equalization algorithm for dispersive wireless communication systems that employ high throughput quadrature amplitude modulation signals under both Gaussian and impulsive noise environments. A novel cost function that combines the modulus match error function with the negative Gaussian kernel function is established to efficiently obtain the weight vector associated with the blind equalizer. Some preferable properties of the novel cost function are presented. Intensive studies show that the proposed cost function efficiently reduces the maladjustment caused by the modulus mismatch error and efficiently suppresses the negative influence resulting from large errors. Moreover, an efficient successive approximation method for minimizing the established cost function is proposed for fast searching of the optimal weight vector. Very importantly, it is proved that the proposed successive approximation method possesses superlinear convergence. Finally, extensive simulations are provided to demonstrate that the proposed blind equalizer has better performances than the existing methods under both Gaussian and impulsive noise circumstances in terms of equalization quality and equalization efficiency.
针对高斯噪声和脉冲噪声环境下高吞吐量正交调幅信号的色散无线通信系统,提出了一种盲均衡算法。建立了一种将模匹配误差函数与负高斯核函数相结合的代价函数,以有效地获得与盲均衡器相关的权向量。给出了这种新型代价函数的一些较好的性质。大量研究表明,所提出的代价函数有效地降低了模量失配误差引起的失调,有效地抑制了大误差带来的负面影响。此外,为了快速搜索出最优权向量,提出了一种有效的逐次逼近最小化所建立的代价函数的方法。重要的是,证明了所提出的逐次逼近方法具有超线性收敛性。最后,通过大量的仿真验证了所提出的盲均衡器在高斯噪声和脉冲噪声环境下的均衡质量和均衡效率均优于现有方法。
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引用次数: 0
A Nonparametric Data-Driven Classifier Based on the Cumulant Generating Function 基于累积量生成函数的非参数数据驱动分类器
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-07 DOI: 10.1109/TSP.2025.3525951
Steven Kay;Kaushallya Adhikari;Bo Tang
We introduce a nonparametric data-driven classifier that harnesses the statistical properties of the data through the cumulant generating function of the training data. Its implementation is straightforward, requiring only a single tuning parameter. Moreover, it ensures global solutions due to inherent convex optimization. The classifier is explainable, where unexpected or poor results can be interpreted and ameliorated. We derive the properties of the classification statistic, offering insightful observations. We apply the classifier to real-world datasets. The simulation results demonstrate the efficacy of the proposed classifier in signal classification, even in scenarios with mismatched training and testing datasets. Moreover, the results demonstrate that the CGFC has lower computational complexity compared to neural networks.
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引用次数: 0
Tensor Completion Network for Visual Data 用于可视化数据的张量补全网络
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-01 DOI: 10.1109/TSP.2024.3524568
Xiang-Yu Wang;Xiao-Peng Li;Nicholas D. Sidiropoulos;Hing Cheung So
Tensor completion aims at filling in the missing elements of an incomplete tensor based on its partial observations, which is a popular approach for image inpainting. Most existing methods for visual data recovery can be categorized into traditional optimization-based and neural network-based methods. The former usually adopt a low-rank assumption to handle this ill-posed problem, enjoying good interpretability and generalization. However, as visual data are only approximately low rank, handcrafted low-rank priors may not capture the complex details properly, limiting the recovery performance. For neural network-based methods, despite their impressive performance in image inpainting, sufficient training data are required for parameter learning, and their generalization ability on the unseen data is a concern. In this paper, combining the advantages of these two distinct approaches, we propose a tensor Completion neural Network (CNet) for visual data completion. The CNet is comprised of two parts, namely, the encoder and decoder. The encoder is designed by exploiting the CANDECOMP/PARAFAC decomposition to produce a low-rank embedding of the target tensor, whose mechanism is interpretable. To compensate the drawback of the low-rank constraint, a decoder consisting of several convolutional layers is introduced to refine the low-rank embedding. The CNet only uses the observations of the incomplete tensor to recover its missing entries and thus is free from large training datasets. Extensive experiments in inpainting color images, grayscale video sequences, hyperspectral images, color video sequences, and light field images are conducted to showcase the superiority of CNet over state-of-the-art methods in terms of restoration performance.
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引用次数: 0
Identification of ARMAX Models With Noisy Input: A Parametric Frequency Domain Solution 带噪声输入的ARMAX模型辨识:一种参数频域解
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-23 DOI: 10.1109/TSP.2024.3522300
Shenglin Song;Erliang Zhang
This paper deals with frequency domain parametric identification of ARMAX models when the input is corrupted by white noise. By means of a multivariate ARMA representation, the ARMAX model within the errors-in-variables (EIV) framework is identified by a successive two-stage approach, and all the parameter estimates of the dynamic EIV model are further jointly tuned to achieve minimum variance among unbiased estimators using second-order statistics of input-output data. Sufficient conditions are constructed to obtain the identifiability of the EIV-ARMAX model as well as the multivariate ARMA process. The consistency of the estimator is analyzed, and the uncertainty bound of the estimate is also provided and compared with the Cramér-Rao lower bound. The performance of the proposed method is demonstrated via numerical and real examples.
本文研究了输入信号受白噪声干扰时ARMAX模型的频域参数辨识问题。通过多元ARMA表示,采用连续两阶段方法识别变量误差(EIV)框架内的ARMAX模型,并利用输入输出数据的二阶统计量进一步联合调整动态EIV模型的所有参数估计,以实现无偏估计之间的方差最小。构造了EIV-ARMAX模型和多元ARMA过程的可辨识性的充分条件。分析了估计量的一致性,给出了估计量的不确定性界,并与cram - rao下界进行了比较。通过数值和实例验证了该方法的有效性。
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引用次数: 0
Target Localization and Sensor Self-Calibration of Position and Synchronization by Range and Angle Measurements 基于距离和角度测量的目标定位和传感器位置与同步自校准
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-23 DOI: 10.1109/TSP.2024.3520909
Tianyi Jia;Xiaochuan Ke;Hongwei Liu;K. C. Ho;Hongtao Su
The sensor position uncertainties and synchronization offsets can cause substantial performance degradation if the sensors are not properly calibrated. This paper investigates the localization of a constant velocity moving target and the self-calibration of sensors using a sequence of range and azimuth measurements observed at successive instants. A theoretical study by the Cramer-Rao Lower Bound (CRLB) reveals that the sensor positions can only be self-calibrated when there are at least two sensors and synchronization offsets can be handled by joint estimation. A low complexity sequential closed-form solution is proposed to estimate the target position and velocity first, and the coordinates of each sensor and synchronization offset afterward. While less intuitive, the analysis shows that the closed-form solutions for both the target and sensor parameters can reach the CRLB accuracy under small Gaussian noise. We also develop a semidefinite programming (SDP) solution by semidefinite relaxation (SDR) for joint localization and calibration from the Maximum Likelihood formulation, which exhibits higher noise tolerance than the closed-form solution. Simulations validate the analysis and the performance of the proposed methods.
如果传感器校准不当,传感器位置的不确定性和同步偏移会导致传感器性能的严重下降。本文研究了等速运动目标的定位和传感器的自定标问题,该问题采用连续时刻观测到的一系列距离和方位角测量。通过Cramer-Rao下限(CRLB)的理论研究表明,只有当至少有两个传感器且同步偏移可以通过联合估计处理时,传感器位置才能自校准。提出了一种低复杂度的顺序封闭解,先估计目标位置和速度,再估计各传感器的坐标和同步偏移量。虽然不太直观,但分析表明,在小高斯噪声下,目标参数和传感器参数的封闭解都可以达到CRLB精度。我们还开发了一种半定规划(SDP)解决方案,利用半定松弛(SDR)从最大似然公式进行联合定位和校准,该解决方案具有比封闭形式解决方案更高的噪声容忍度。仿真验证了所提方法的分析和性能。
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引用次数: 0
Normalizing Flow-Based Differentiable Particle Filters 归一化基于流的可微粒子滤波器
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-23 DOI: 10.1109/TSP.2024.3521338
Xiongjie Chen;Yunpeng Li
Recently, there has been a surge of interest in incorporating neural networks into particle filters, e.g. differentiable particle filters, to perform joint sequential state estimation and model learning for nonlinear non-Gaussian state-space models in complex environments. Existing differentiable particle filters are mostly constructed with vanilla neural networks that do not allow density estimation. As a result, they are either restricted to a bootstrap particle filtering framework or employ predefined distribution families (e.g. Gaussian distributions), limiting their performance in more complex real-world scenarios. In this paper we present a differentiable particle filtering framework that uses (conditional) normalizing flows to build its dynamic model, proposal distribution, and measurement model. This not only enables valid probability densities but also allows the proposed method to adaptively learn these modules in a flexible way, without being restricted to predefined distribution families. We derive the theoretical properties of the proposed filters and evaluate the proposed normalizing flow-based differentiable particle filters’ performance through a series of numerical experiments.
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引用次数: 0
Three-Dimensional Localization of Mixed Near-Field and Far-Field Sources Based on a Unified Exact Propagation Model 基于统一精确传播模型的近场和远场混合源三维定位
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-20 DOI: 10.1109/TSP.2024.3520551
Jiaxiong Fang;Hua Chen;Wei Liu;Songjie Yang;Chau Yuen;Hing Cheung So
In applications like speaker localization using a microphone array, the collected signals are typically a mixture of far-field (FF) and near-field (NF) sources. To find the positions of both NF and FF sources, a three-dimensional spatial-temporal localization algorithm based on a unified exact propagation geometry is developed in this paper, which avoids approximating the spatial phase difference with the first-order and second-order Taylor expansions applied to FF and NF sources, respectively. Our scheme utilizes cross-correlation to produce virtual observations for establishing a third-order parallel factor data model with the use of spatial and temporal information. The array's steering vectors can be extracted by trilinear decomposition. The amplitude and phase information of the whole array elements is jointly exploited to classify the source types and obtain the location estimates via a least squares method. Moreover, the proposed algorithm is computationally efficient since no spectral searches, high-order statistics calculations or parameter pairing procedures are required. The deterministic Cramér-Rao bound is also derived as a performance benchmark, and numerical results are provided to demonstrate the effectiveness of the developed method.
在使用麦克风阵列的扬声器定位等应用中,收集的信号通常是远场(FF)和近场(NF)源的混合。为了找到NF源和FF源的位置,本文提出了一种基于统一精确传播几何的三维时空定位算法,避免了分别用FF源和NF源的一阶和二阶Taylor展开来逼近空间相位差。我们的方案利用互相关产生虚拟观测,利用时空信息建立三阶并行因子数据模型。通过三线性分解可以提取阵列的方向向量。利用整个阵元的幅值和相位信息对源类型进行分类,并通过最小二乘法得到源的位置估计。此外,该算法不需要谱搜索、高阶统计量计算或参数配对过程,计算效率高。本文还推导了确定性cram r- rao界作为性能基准,并给出了数值结果来验证该方法的有效性。
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引用次数: 0
IEEE Signal Processing Society Information IEEE信号处理学会信息
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-20 DOI: 10.1109/TSP.2024.3354364
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引用次数: 0
List of Reviewers 审稿人名单
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-19 DOI: 10.1109/TSP.2024.3499092
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引用次数: 0
Hybrid DTD-AOA Multi-Object Localization in 3-D by Single Receiver Without Synchronization and Some Transmitter Positions: Solutions and Analysis 单接收机无同步和若干发射机位置的混合DTD-AOA三维多目标定位:解决方案与分析
IF 4.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-17 DOI: 10.1109/TSP.2024.3519442
Danyan Lin;Gang Wang;K. C. Ho;Lei Huang
This paper addresses the multi-object localization problem by using a hybrid of differential time delay (DTD) and angle-of-arrival (AOA) measurements collected by a single receiver in an unsynchronized multistatic localization system, where two kinds of transmitters, intentional transmitters at known positions and unintentional transmitters at unknown positions, are used for the illumination of the objects. By integrating the DTD and AOA measurements, we first derive a new set of transformed observation models relating to the object positions, and then investigate the three cases of intentional transmitters only, a mix of intentional and unintentional transmitters, and unintentional transmitters only. Localization for the first case is addressed by a linear weighted least squares (LWLS) estimator and the other two are solved by applying semidefinite relaxation followed with an LWLS estimator. Furthermore, we conduct a thorough theoretical analysis. It shows that incorporating unintentional transmitters at unknown positions is beneficial to improve the localization performance, and increasing the number of objects will also improve the positioning accuracy when unintentional transmitters are used. Additionally, a theoretical bias analysis is conducted, based on which a bias-subtracted solution is given. Both theoretical mean square error analysis and simulations validate well the good performance of the proposed methods.
本文通过在非同步多静态定位系统中使用单个接收器收集的差分时间延迟(DTD)和到达角(AOA)测量数据的混合方法来解决多目标定位问题,其中两种发射器,已知位置的有意发射器和未知位置的无意发射器用于物体的照明。通过整合DTD和AOA测量,我们首先导出了一组新的与目标位置相关的变换观测模型,然后研究了三种情况,即只有有意发射机、有意和无意发射机混合以及只有无意发射机。第一种情况的定位是通过线性加权最小二乘估计来解决的,另外两种情况的定位是通过应用半定松弛和LWLS估计来解决的。此外,我们进行了深入的理论分析。结果表明,在未知位置加入无意发射机有利于提高定位性能,增加目标数量也能提高无意发射机的定位精度。此外,还进行了理论偏差分析,并在此基础上给出了减偏解。理论均方误差分析和仿真均验证了所提方法的良好性能。
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IEEE Transactions on Signal Processing
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