Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)最新文献

英文中文

Real-Time Estimation of Direction of Arrival of Speech Source Using Three Microphones. 基于三个传声器的语音源到达方向实时估计。

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2020-10-01 Epub Date: 2020-09-23 DOI: 10.1109/sips50750.2020.9195217

Serkan Tokgöz, Anton Kovalyov, Issa Panahi

In this paper, we present a real-time noise-robust direction of arrival (DOA) estimation technique using only the three built-in microphones of the modern Android-based smartphone. The proposed method eliminates the 'front-back' ambiguity caused by the symmetry of the two microphones reported previously and improves the performance of DOA estimation in noisy speech environments. Our method enhances the spatial awareness of hearing-impaired users by displaying the precise DOA angle of speech source on their smartphone screen. For increased efficiency, noise-robustness, and accuracy of the proposed DOA estimation method, a spectral pre-filtering technique and a Voice Activity Detector (VAD) based post-filtering are used along with a modified generalized cross-correlation (GCC) technique. Real recorded and simulated data under realistic noisy conditions are used in the evaluations of the proposed algorithm. Real-time implementation of the proposed system is carried out on an Android-based smartphone without any additional hardware or external microphone attachments. Experimental results show the performance of the proposed method versus those without pre or post-filtering under three different noisy conditions with 0dB to 10dB signal to noise ratios (SNRs).

在本文中，我们提出了一种仅使用现代基于android的智能手机的三个内置麦克风的实时噪声鲁棒到达方向(DOA)估计技术。该方法消除了之前报道的由两个传声器的对称性引起的“前后”模糊，提高了噪声语音环境下的DOA估计性能。我们的方法通过在智能手机屏幕上显示语音源的精确方位角度来增强听障用户的空间意识。为了提高所提出的DOA估计方法的效率、噪声鲁棒性和准确性，使用了频谱预滤波技术和基于语音活动检测器(VAD)的后滤波以及改进的广义互相关技术(GCC)。在实际噪声条件下的真实记录和模拟数据用于评估所提出的算法。该系统的实时实现是在基于android的智能手机上进行的，没有任何额外的硬件或外部麦克风附件。实验结果表明，在信噪比为0 ~ 10dB的三种不同噪声条件下，该方法与未预滤波和后滤波方法相比具有良好的性能。

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引用次数: 5

Optimization of Calibration Algorithms on a Manycore Embedded Platform 多核嵌入式平台标定算法的优化

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2018-10-01 DOI: 10.1109/SiPS.2018.8598369

Nicolas Sourbier, J. Nezan, C. Tasse, J. Hascoet

This paper presents the porting and the optimization of full polarization, direction independent calibration algorithm for radio-interferometry, on an embedded many-core platform. In astronomy, calibration algorithms consist of solving for the unknown complex antenna gains using a known model of the sky. Calibration is a key computation to provide images of the sky at good quality and high resolutions. In the context of the Square Kilometer Array (SKA) project, real-time and low power execution of the calibration is challenging. In this paper, we show that the CohJohnes algorithm provides good properties for being executed efficiently on the new generation of many-core embedded platforms. Experimental results are provided using the Kalray MPPA Bostan platform running 288 64-bit VLIW cores and delivering up to 845 GFLOPS at 12W.

引用次数: 0

A signal denoising technique based on wavelets modulus maxima lines and a self-scalable grid classifier 基于小波模极大值线和自扩展网格分类器的信号去噪技术

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2015-12-03 DOI: 10.1109/SiPS.2015.7344974

R. M. G. Machado, H. O. Mota

This paper presents the description of a signal processing technique using the Wavelets Transform and a self-scalable grid classifier. The procedure is based on the cycle-spinning approach applied to the Translation-invariant Wavelet Transform. It exploits the characteristics of the Wavelets modulus maxima propagation along decomposition levels (scales) as the criterion to select the relevant coefficients. Selection was performed by a data classifier inspired on a Self-organizing Map but with enhancements to incorporate self-scalability and multiple instance learning capabilities. The procedure was employed for the processing of Partial Discharge signals, which is a technique for the diagnostics of high-voltage equipment. We performed comparisons with standard form classifiers based on the Multilayer Perceptron and Support Vector Machines. The results show that the technique allows the same orders of accuracy and generalization of those classifiers, but with the advantages of self-scalability, dimensional independence, low processing cost and high degree of parallelization.

本文介绍了一种基于小波变换和自扩展网格分类器的信号处理技术。该程序是基于循环旋转方法应用于平移不变小波变换。它利用小波模极大值沿分解层次(尺度)传播的特性作为选择相关系数的准则。选择由受自组织映射启发的数据分类器执行，但增强了自伸缩性和多实例学习功能。该程序用于处理局部放电信号，这是一种高压设备的诊断技术。我们与基于多层感知机和支持向量机的标准形式分类器进行了比较。结果表明，该方法在精度和泛化程度上与上述分类器保持一致，但具有自扩展、维度无关、处理成本低、并行化程度高等优点。

引用次数: 1

Spectral Management of Multiple Wireless Signals Based Cognitive Radio 基于认知无线电的多无线信号频谱管理

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2013-01-01 DOI: 10.12720/IJSPS.1.2.290-295

Ammar Abdul, Hamed Khader, A. Shabani, M. Beg

Intelligent radio resource management (RRM) policies could be applied to minimize the harmful effects of interference and an uneven load distribution. RRM should provide efficient spectrum and channel allocation mechanisms, modulation selection algorithms, power control and load balancing. Spectrum sensing is a key enabling technology for a broad class of cognitive radio systems involving spectrum agility. In order to identify spectral opportunities, spectrum sensing is needed by the secondary users (SU). In this paper a spectral management and sensing for three types of wireless signals within the IEEE802 family (Wi-Fi, Zig-Bee and Bluetooth) are presented. Then SU efficiently exploit the idle spectrum and vacate it when required by primary user (PU). A simulation system is built and Energy Detector technique is used for sensing the spectrum. The results shows that delay times for changing the status between exploiting and vacating the channels are too low. The error detection is occurred in limited range of SNR because of using fixed threshold level. 

智能无线电资源管理(RRM)策略可以最大限度地减少干扰和负载分布不均匀的有害影响。RRM应该提供有效的频谱和信道分配机制、调制选择算法、功率控制和负载平衡。频谱感知是涉及频谱敏捷性的一类认知无线电系统的关键使能技术。为了识别频谱机会，二级用户(SU)需要进行频谱感知。本文介绍了IEEE802系列中三种无线信号(Wi-Fi、zigbee和蓝牙)的频谱管理和传感。然后SU有效地利用空闲频谱，并在主用户(PU)需要时将其清空。建立了仿真系统，利用能量探测器技术对光谱进行检测。结果表明，利用信道和腾出信道之间改变状态的延迟时间过低。由于使用固定的阈值水平，错误检测发生在有限的信噪比范围内。

引用次数: 0

Synthesizing hardware from dataflow programs: An MPEG-4 simple profile decoder case study 从数据流程序合成硬件:一个MPEG-4简单配置文件解码器案例研究

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2008-11-17 DOI: 10.1109/SIPS.2008.4671777

J. Janneck, Ian D. Miller, D. Parlour, Ghislain Roquier, M. Wipliez, M. Raulet

The MPEG Reconfigurable Video Coding working group is developing a new library-based process for building the reference codecs of future MPEG standards, which is based on dataflow and uses an actor language called CAL. The paper presents a code generator producing RTL targeting FPGAs for CAL, outlines its structure, and demonstrates its performance on an MPEG-4 Simple Profile decoder. The resulting implementation is smaller and faster than a comparable RTL reference design, and the second half of the paper discusses some of the reasons for this counter-intuitive result.

MPEG可重构视频编码工作组正在开发一种新的基于库的流程，用于构建未来MPEG标准的参考编解码器，该流程基于数据流并使用一种称为CAL的actor语言。本文介绍了一种针对CAL生成RTL目标fpga的代码生成器，概述了其结构，并演示了其在MPEG-4简单配置文件解码器上的性能。最终的实现比类似的RTL参考设计更小、更快，本文的后半部分讨论了产生这种反直觉结果的一些原因。

引用次数: 122

Analysis of Forwarding Mechanisms on Fine-Grain Gradient Sinking Model in WSN WSN中细粒梯度下沉模型转发机制分析

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2008-05-01 DOI: 10.1007/S11265-007-0103-4

Sun Limin, Hongsong Zhu, Duan Bin, Xiaowei Li, S. Yi

引用次数: 10

Rapid Abstract Control Model for Signal Processing Implementation 用于信号处理实现的快速抽象控制模型

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387584

Kannan Gaddam, N. Chandrachoodan, S. Srinivasan

Evaluating different architectures is an important step in implementing signal processing algorithms in hardware. Often specific resource or memory requirements and performance can be estimated only through simulation. This can be difficult when detailed system descriptions are used. There is a need for quick simulation and estimation of performance. The Rapid Abstract Control (RAC) model is presented as an approach to solve this problem. Simple primitives are defined that can be used to construct models for simulation. The Single Scale Retinex (SSR) algorithm is used to demonstrate the effectiveness of the modeling approach.

评估不同的架构是在硬件上实现信号处理算法的重要步骤。通常，特定的资源或内存需求和性能只能通过模拟来估计。当使用详细的系统描述时，这可能很困难。需要对性能进行快速仿真和估计。快速抽象控制(RAC)模型是解决这一问题的一种方法。定义了可用于构建仿真模型的简单原语。通过单尺度Retinex (Single Scale reinex, SSR)算法验证了建模方法的有效性。

引用次数: 0

Luby Transform Coding Aided Iterative Detection for Downlink SDMA Systems 下行SDMA系统的Luby变换编码辅助迭代检测

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387580

Chun-Yi Wei, Thanh Dang Nguyen, N. Wu, J. Akhtman, Lie-liang Yang, L. Hanzo

A Luby Transform (LT) coded downlink Spatial Division Multiple Access (SDMA) system using iterative detection is proposed, which invokes a low-complexity near-Maximum-Likelihood (ML) Sphere Decoder (SD). The Ethernet-based Internet section of the transmission chain inflicts random packet erasures, which is modelled by the Binary Erasure Channel (BE), while the wireless downlink imposes both fading and noise. A novel Log-Likelihood Ratio based packet reliability meric is used for identifying the channel-decoded packets, which are likely to be error-infested. Packets having residual errors must not be passed on to the LT decoder for the sake of avoiding LT-decoding-induced error propagation. The proposed scheme is capable of maintaining an infinitesimally low packet error ratio in the downlink of the wireless Internet for Eb/N0 values in excess of about 3dB.

提出了一种基于迭代检测的Luby变换(LT)编码下行空分多址(SDMA)系统，该系统调用了一种低复杂度的近最大似然(ML)球体解码器(SD)。传输链中基于以太网的互联网部分造成随机数据包擦除，这是由二进制擦除通道(BE)建模的，而无线下行链路则造成衰落和噪声。一种新颖的基于对数似然比的数据包可靠性度量用于识别可能存在错误的信道解码数据包。有残留错误的数据包不能传递给LT解码器，以避免LT解码引起的错误传播。所提出的方案能够在超过约3dB的Eb/N0值时，在无线互联网下行链路中保持极低的分组错误率。

引用次数: 3

Symbol Error Probability Analysis of an FFH/MFSK Receiver with Noise-Normalization Combining in a Fading Channel with Partial-Band Jamming 部分频带干扰下衰落信道中噪声归一化组合FFH/MFSK接收机的符号误差概率分析

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387576

Jian Zheng, Yi-Sheng Zhu, Li-ping Zhu

A new analysis method for the error performance analysis of Nakagami-fading channels is proposed. Two forms of the bit error rate (BER) expressions are derived for a noncoherent fast frequency-hopped M-ary orthogonal frequency-shift-keying (FFH/MFSK) spread spectrum (SS) receiver over frequency non-selective slow Nakagami-fading channels. The FFH/MFSK system employs noise-normalization combining in the presence of partial-band interference (PBI) and additive white Gaussian noise (AWGN). The probability density function (pdf) and characteristics function (CF) based approaches are used for analysis of the error performance. Numerical results show the effects of arbitrarily values of fading parameter and diversity level on system performance.

提出了一种新的中上衰落信道误差性能分析方法。推导了非相干快跳频正交移频键控(FFH/MFSK)扩频接收机在频率非选择性慢中川衰落信道上的误码率表达式的两种形式。在部分频带干扰(PBI)和加性高斯白噪声(AWGN)存在的情况下，FFH/MFSK系统采用噪声归一化组合。基于概率密度函数(pdf)和特征函数(CF)的方法对误差性能进行了分析。数值结果表明，任意取值的衰落参数和分集电平对系统性能的影响。

引用次数: 1

Low Complexity Real-Time Video Transcoders for Video Upload and Retrieval Applications 用于视频上传和检索应用的低复杂度实时视频转码器

Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)

Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387574

K. Ozawa, Hironori Ito, Kazuteru Watanabe, Kazuhiro Koyama, A. Murashima

This paper proposes low complexity real-time video transcoders for video upload and retrieval applications. The proposed transcoders consist of both picture type conversion and syntax conversion in the compressed domain, and can highly reduce the computation amount in comparison with that of the conventional tandem transcoding method, in which decoding and re-encoding are necessary. The proposed syntax conversion can provide loss-less conversion, while the conventional tandem method is lossy conversion. Timestamp adjustment method is also proposed to avoid audio visual de-synchronization problem due to picture type conversion, when the stream is transmitted via constant bandwidth network. Complexity evaluation results based on DSP implementation confirm that the complexity of the proposed transcoders is very low and is less than 1/3 of that of the conventional tandem transcoder.

本文提出了一种用于视频上传和检索的低复杂度实时视频转码器。所提出的转码器在压缩域内由图像类型转换和语法转换两部分组成，与需要解码和重新编码的传统串联转码方法相比，可以大大减少计算量。本文提出的语法转换可以提供无损转换，而传统的串联方法是有损转换。同时提出了时间戳调整方法，以避免流在恒带宽网络中传输时由于图像类型转换造成的视听不同步问题。基于DSP实现的复杂性评估结果证实，所提出的转码器的复杂性非常低，不到传统串联式转码器的1/3。

引用次数: 1

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