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共 1267 条记录，以下是181-190 订阅

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Microphone array Beampattern Characterization for Hands-free Speech Applications

Microphone Array Beampattern Characterization for Hands-free...

引用

ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Taghizadeh, Mohammad J. Garner, Philip N. Bourlard, Herve Idiap Res Inst Lausanne Switzerland Idiap Res Inst EPFL Lausanne Switzerland

ISBN: (纸本)9781467310710

Spatial filtering is the fundamental characteristic of microphone array based signal acquisition, which plays an important role in applications such as speech enhancement and distant speech recognition. In the array processing literature, this property is formulated upon beam-pattern steering and it is characterized for narrowband signals. This paper proposes to characterize the microphone array broadband beam-pattern based on the average output of a steered beamformer for a broadband spectrum. Relying on this characterization, we derive the directivity beam-pattern of delay-and-sum and superdirective beamformers for a linear as well as a circular microphone array. We further investigate how the broadband beam-pattern is linked to speech recognition feature extraction;hence, it can be used to evaluate distant speech recognition performance. The proposed theory is demonstrated with experiments on real data recordings.

关键词： Broadband beam-pattern Delay-and-sum beamformer Superdirective beamformer Distant speech recognition

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On time-invariant FDA beam-pattern design based on time-dependent frequency offsets 11

On time-invariant FDA beam-pattern design based on time-depe...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Shi, Jiantao Nanjing Res Inst Elect Technol Nanjing 210039 Peoples R China CETC Key Lab Intellisense Technol Nanjing 210039 Peoples R China

ISBN: (纸本)9781728119465

In the existing works on FDA beam-patterns produced by the traditional FDA are time variant, and this causes difficulties in target detecting and beam-pattern steering. For solving the problem, several time-dependent frequency offsets based time-invariant FDA beam-pattern design methods have been proposed, which, however, neglected the time-range relationship and led to erroneous conclusions. In this note, considering the practical constraint and the relationship between time and range, it is concluded that FDA beam-patterns are always time-variant and it is unable to form time-invariant beam-patterns.

关键词： Frequency diverse array time-dependent frequency offset time-invariant beam-pattern time-range relationship

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Direction of Arrival Estimation with Microphone arrays Using SRP-PHAT and Neural Networks 10

Direction of Arrival Estimation with Microphone Arrays Using...

引用

10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Diaz-Guerra, David Beltran, Jose R. Univ Zaragoza Dept Elect Engn & Commun Zaragoza Spain

ISBN: (纸本)9781538647523

The Steered Response Power with phase transform (SRP-PHAT) is one of the most employed techniques for Direction of Arrival (DOA) estimation with microphone arrays due its robustness against acoustical conditions as reverberation or noise. Among its main drawbacks is the growth of its computational complexity when the search space increases. To solve this issue, we propose the use of Neural Networks (NN) to obtain the DOA as a regression problem from a low resolution SRP-PHAT power map. The NNs can learn and exploit the information of the acoustic reflections of the room where the array is located with a training method that can be easily performed by an end user without technical knowledge.

关键词： microphone array direction of arrival DOA Sound Source Localization SSL SRP SRP-PHAT neural netowrks tele-conference system Wireless Acoustic sensor Network WASN WSN

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Transmit Beampattern Design for Dual-Function Radar-Communication System with an Interleaved array 11

Transmit Beampattern Design for Dual-Function Radar-Communic...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Chen, Yufeng Liao, Guisheng Yang, Zhiwei Zhu, Shengqi Liu, Yongjun Jiang, Mengchao Xidian Univ Natl Lab Radar Signal Proc Xian 710071 Peoples R China

ISBN: (纸本)9781728119465

In this paper, a beampattern design method is proposed for the multi-input-multi-output (MIMO) dual-function radar-communication (DFRC) system with an interleaved array. To make full use of the whole aperture, first, the transmit array is partitioned into two interleaved subarrays, one is for radar and the other is for downlink communications. Then, both the radar waveform and communication beamformers are optimized by combining the null-space projection (NSP) method and cyclic approach (CA) to perform the coexistence of MIMO radar and downlink communications. Besides, the communication beampattern can be utilized to improve the detection performance. Finally, several numerical results are given to show the effectiveness of the proposed method.

关键词： dual-function radar-communication transmit beampattern interleaved array MIMO

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Frequency-Switching Sparse arrays 13

Frequency-Switching Sparse Arrays

引用

13rd ieee sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Yimin D. Chowdhury, Md Waqeeb T. S. Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA

ISBN: (纸本)9798350344820;9798350344813

In this paper, we propose high-resolution target direction-of-arrival (DOA) estimation using frequency-switching sparse arrays which implement multi-frequency sparse arrays in a low-complexity manner. Unlike multi-frequency sparse arrays which require processing of wideband signals comprising multiple frequency components, the proposed frequency-switching sparse arrays only need to process a single-frequency component at any time instant, thereby eliminating such hurdles and significantly reducing the system complexity. A frequency-switching sparse array achieves the same number of degrees-of-freedom as a multi-frequency counterpart with comparable DOA estimation performance. Numerical results on the DOA estimation performance and Cramer-Rao bounds are provided to illustrate the effectiveness of the proposed frequency-switching sparse arrays.

关键词： Sparse array direction-of-arrival estimation frequency diversity frequency-switching group sparsity

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Advanced Hybrid Beamforming Design for MIMO Systems 10

Advanced Hybrid Beamforming Design for MIMO Systems

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Yang, Bowen Molu, Mehdi M. Zhang, Lei Univ Glasgow Sch Engn Glasgow G12 8QQ Lanark Scotland SCSC Cambridge CB4 0DS England

ISBN: (纸本)9781538647523

One of the fundamental problems for hybrid beamformer design in MIMO systems is that, in Singular-Value-Decomposition (SVD) based beamforming, the analog beamformer is limited to constant modulus. In order to solve this issue, an algorithm is proposed in this paper. Specifically, the parallel data streams are expressed mathematically, and then the math expression of the analog beamformer is achieved through maximizing the power of desired data streams while minimizing the power of interference. Then, the digital part of the beamformer is calculated based on a channel equivalent process, i.e., considering the phase response vector of the derived analog beamformers as part of the channel observed by the digital beamformers. Simulations are performed on the proposed algorithm and compared to a recent state-of-the-art technique. The results show that the proposed one outperforms in terms of sphere of application (i.e., different antenna array sizes and channel sparsities).

关键词： Antenna arrays array signal processing signal processing algorithms Interference Radio frequency Scattering Complexity theory"

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Toeplitz Structured Covariance Matrix Estimation for Radar Applications 11

Toeplitz Structured Covariance Matrix Estimation for Radar A...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Du, Xiaolin Aubry, Augusto De Maio, Antonio Cui, Guolong Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu Peoples R China Yantai Univ Sch Comp & Control Engn Yantai Peoples R China Univ Napoli Federico II DIETI Naples Italy

ISBN: (纸本)9781728119465

Following a geometric paradigm, the estimation of a Toeplitz structured covariance matrix is considered. The estimator minimizes the distance from the Sample Covariance Matrix (SCM) while complying with some specific constraints modeling the covariance structure. The resulting constrained optimization problem is solved globally resorting to the Dykstra' projection framework. Each step of the procedure involves the solution of two convex sub-problems, whose minimizers are available in closed form. Simulation results related to typical radar environments highlight the effectiveness of the devised method.

关键词： Radar signal processing covariance matrix estimation projection Toeplitz structure

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Source counting in real-time sound source localization using a circular microphone array

Source counting in real-time sound source localization using...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Pavlidi, Despoina Griffin, Anthony Puigt, Matthieu Mouchtaris, Athanasios FORTH ICS GR-70013 Iraklion Crete Greece

ISBN: (纸本)9781467310710

Recently, we proposed an approach inspired by Sparse Component Analysis for real-time localization of multiple sound sources using a circular microphone array. The method was based on identifying time-frequency zones where only one source is active, reducing the problem to single-source localization for these zones. A histogram of estimated Directions of Arrival (DOAs) was formed and then processed to obtain improved DOA estimates, assuming that the number of sources was known. In this paper, we extend our previous work by proposing three different methods for counting the number of sources by looking for prominent peaks in the derived histogram based on: (a) performing a peak search, (b) processing an LPC-smoothed version of the histogram, (c) employing a matching pursuit-based approach. The third approach is shown to perform very accurately in simulated reverberant conditions and additive noise, and its computational requirements are very small.

关键词： Additive noise

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Direct Position Determination of Locally Scattered Sources Using Generalized array Manifold Model 13

Direct Position Determination of Locally Scattered Sources U...

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13rd ieee sensor array and multichannel signal processing workshop (SAM)

作者： Palanivelu, Devanand Palur Oispuu, Marc Koch, Wolfgang Dallmann, Thomas Fraunhofer Inst Commun Informat Proc & Ergon FKIE Wachtberg Germany Tech Univ Ilmenau Radio Technol Automated & Connected Vehicles Res Ilmenau Germany

ISBN: (纸本)9798350344820;9798350344813

Source localization from raw array data by reparameterizing the array steering vector by the source position is a fundamental principle of direct position determination (DPD). In this paper, we propose a DPD method to estimate the position of locally scattered sources using an unsynchronized array sensor network. Here, we use the well-known generalized array manifold (GAM) model which approximates the steering vector using its first-order gradient in order to characterize the local scattering effect. The proposed method is compared with the conventional two-stage bearings-only localization (BOL) approach. Simulation results reveal that the proposed DPD position estimates asymptotically attain the derived Cramier-Rao Bound (CRB) for high SNR values and an improved localization accuracy is achieved by exploiting the local scattering parameters in the localization.

关键词： Direct Position Determination Generalized array Manifold model Cramier-Rao Bound Local Scattering Localization Accuracy

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Quantifying the Advantages of Joint processing in TDOA Estimation

Quantifying the Advantages of Joint Processing in TDOA Estim...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Yeredor, Arie Tel Aviv Univ Sch Elect Engn IL-69978 Tel Aviv Israel

ISBN: (纸本)9781467310710

We address the problem of passive estimation of the Time-Difference of Arrival (TDOA) of an unknown, stochastic signal, at two sensors. The key question addressed here is whether additional sensors, receiving the same signal at various relative delays, can serve to improve the accuracy in estimating the TDOA of interest between the first two sensors (without exploiting any underlying parameterization, such as dependence on the transmitter's location). We derive the Cramer-Rao Lower Bound (CRLB) on the resulting joint estimation error in a model which possibly includes multipath reflections. We show analytically, that in a multipath-free scenario, at high to moderate signal to Noise Ratios, additional sensors do not offer any improvement in accuracy. However, we also demonstrate (numerically) that in the presence of multipath reflections (possibly received at all sensors), the additional sensors can indeed assist in estimating the TDOA of interest with improved accuracy.

关键词： Time difference of arrival

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