SAM 2010 - Technical Program
Sixth IEEE Sensor Array and Multichannel Signal Processing Workshop
Monday, October 4
12:00 - 14:00
Registration
14:00 - 14:15
Opening remarks
14:15 - 15:15
Plenary 1: An Information Theoretic View of Robust Cooperation/Relaying in Wireless Networks
Shlomo Shamai, Technion-Israel Institute of Technology, Israel
In many wireless networks, cooperation, in the form of relaying, takes place over out-of- band spectral resources. Examples are ad hoc networks in which multiple radio interfaces are available for communications or cellular systems with (wireless or wired) backhaul links. In an overview from an information-theoretic standpoint, we put emphasis on robust processing and cooperation via out-of-band links for both ad hoc and cellular networks. Specifically, we focus on robust approaches and practical aspects such as imperfect information regarding the channel state and the codebooks (modulation, coding) shared by transmitters and receivers. First, we address cooperation scenarios with perfect channel state information and investigate the impact of lack of information regarding the codebooks (oblivious processing) on basic relay channels and cellular systems with cooperation among base stations. Then, similar models are examined in the absence of perfect channel state information. Robust coding strategies are designed based on 'variable-to-fixed' channel coding concepts (the broadcast coding approach, or unequal error protection codes). The effectiveness of such strategies are discussed for multirelay channels and cellular systems overlaid with femtocell hotspots.
15:15 - 15:30
Coffee break Mon PM
15:30 - 18:00
Poster session I
Student competition papers
- Robust Focusing for Wideband MVDR Beamforming
- Estimating the performance of a superdirective microphone array with a frequency-invariant response
- Multiantenna spectrum sensing: The case of wideband rank-one primary signals
- Blind extraction algorithm with direct desired signal selection
- Likelihood-ratio and Channel Based Access for Energy-Efficient Detection in Wireless Sensor Networks
- Subspace-based direction-of-arrival estimation for more sources than sensors using planar arrays
- Optimal Subsampling of Multichannel Damped Sinusoids
- UWB Localization via Multipath Distortion
- Space-time Compressive Sampling Array
- 3D Electromagnetic Imaging Using Compressive Sensing
- Modeling Neuron Firing Pattern Using a Two State Markov Chain
- Consensus for distributed EM-based clustering in WSNs
- A Rayleigh fading interference game with incomplete information
- Optimal Bayesian Parameter Estimation With Periodic Criteria
18:00 - 19:00
Plenary 2: Parallel Magnetic Resonance Imaging: a Multi-Channel Signal Processing Perspective
Yoram Bresler, University of Illinois, Urbana-Champaign, USA
Magnetic resonance imaging (MRI) is one of the leading diagnostic imaging modalities. While providing excellent spatial resolution and exquisite soft tissue contrast, MRI suffers from slow acquisition. One of the highly effective approaches developed to address this limitation, is parallel imaging with phased-array coils. However,the freedom in acquisition, modeling, coil calibration, and reconstruction is often dealt with in a heuristic way. In this talk we provide a signal processing perspective on these problems, emphasizing the multichannel structure. We show that this perspective provides some interesting variations with improved performance
19:30 - 21:00
Welcome Reception
Tuesday, October 5
08:30 - 09:30
Plenary 3: A Data Processing Pipeline for the Cosmic Microwave Background
Jean-Francois Cardoso, LTCI, TELECOM Paris, France
At the Sun-Earth Lagrange point L2, 1.5e6 km away from Earth, an array of 63 sensors aboard the Planck satellite is scanning the sky, patiently measuring to unprecedented resolution and sensitivity the micro-Kelvin fluctuations of the Cosmic Microwave Background temperature and polarization. Getting from there to building multi-million-pixel spherical maps of the microwave sky in 9 frequency channels, to reconstructing the history of our Universe is a story in technology, cosmology and... challenging signal processing. This talk will highlight some of the key steps of the data processing pipeline being developed for the Planck space mission of ESA.
09:30 - 10:30
MIMO Radar
- 9:30 Estimating the Parameters of a Moving Target in MIMO Radar With Widely Separated Antennas
- 9:45 Waveform design for sequential MIMO detection
- 10:00 MIMO GMTI Radar with Multipath Clutter Suppression
- 10:15 Fundamental Limitations of Pixel Based Image Deconvolution in Radio Astronomy
Underwater acoustic communications I
- 9:30 Efficient Channel Equalization for MIMO Underwater Acoustic Communications
- 9:50 Adaptive Linear Turbo Equalization of Large Delay Spread Time-Varying Channel Responses
- 10:10 Joint Channel Estimation and Markov Chain Monte Carlo Detection for Frequency-Selective Channels
10:30 - 11:00
Coffee break Tue AM
11:00 - 12:00
Underwater acoustic communications II
- 11:00 A Method for Differentially Coherent Detection of OFDM Signals on Doppler-Distorted Channels
- 11:20 Isotropic Filter Design for MIMO Filter Bank Multicarrier Communications
- 11:40 Reduced Bandwidth Frequency Domain Equalization for Underwater Acoustic Communications
Performance bounds I
- 11:00 Performance Bounds for the Estimation of Finite Rate of Innovation Signals from Noisy Measurements
- 11:15 Numerically Efficient Mean Squared Error Threshold SNR Prediction for Adaptive Arrays
- 11:30 Outage Error Probability Lower Bounds in Vector Parameter Estimation
- 11:45 Information Theoretic Bounds on Mobile Source Localization in a Dense Urban Environment
12:00 - 13:30
Lunch Tue
13:30 - 14:30
Plenary 4: Calibration Challenges for Large Radio Telescope Arrays
Alle-Jan van der Veen, TU Delft, The Netherlands
Radio astronomy is known for its very large telescope dishes, but currently there is a transition towards the use of large numbers of small elements. E.g., the recently commissioned LOFAR low frequency array uses 50 stations each with some 200 antennas, and the numbers will be even larger for the Square Kilometer Array, planned for 2020. Meanwhile some of the existing telescope dishes are being retrofitted with focal plane arrays. These instruments pose interesting challenges for array signal processing. One aspect, which we cover in this talk, is the calibration of such large numbers of antennas, especially if they are distributed over a wide area. Apart from the unknown element gains and phases (which may be directionally dependent), there is the unknown propagation through the ionosphere, which at low frequencies may be diffractive and different over the extent of the array. The talk will discuss several of the challenges, present the underlying data models, and propose some of the answers. We will also touch upon a recent initiative to develop a low-frequency telescope array in space, on a distributed platform formed by a swarm of nanosatellites.
14:30 - 15:50
Performance bounds II
- 14:30 Constrained Hypothesis Testing and the Cramer-Rao Bound
- 14:50 Achievable MSE Lower Bounds in Non-Bayesian Biased Estimation
- 15:10 New trends in deterministic lower bounds and snr threshold estimation
- 15:30 Closed-form expression of the Weiss-Weinstein bound for 3D source localization: the conditional case
15:50 - 16:00
Coffee break Tue PM
16:00 - 18:00
Poster session II
- Multichannel Blind Compressed Sensing
- Sampling of Pulse Streams: Achieving the Rate of Innovation
- Sparse Component Analysis for Linear Mixed Models
- Band-Diagonal Regularization of Gaussian Interference Covariance Matrices ML Estimates
- Independent Component Analysis of Quaternion Gaussian Vectors
- Combining Multiband Joint Position-Pitch Algorithm and Particle Filters for Speaker Localization
- Target tracking in mixed LOS/NLOS environments based on Individual TOA Measurement Detection
- A reference-free time difference of arrival source localization using a passive sensor array
- A Hierarchical approach to Noise-Adaptive Estimation
- Fuzzy triangle contour characterization by subspace based methods of array processing
- Adaptive Identification of Nonlinear MIMO Systems Based on Volterra Models with Additive Coupling
- Prequential Bayes Mixture Approach for Gaussian Mixture Order Selection
Wednesday, October 6
08:30 - 09:30
Plenary 5: Performance-Driven Information Fusion
Alfred Hero, University of Michigan, Ann Arbor, USA
Information fusion involves combining different information sources using models for the joint source distributions. It is a key component of multichannel sensor processing when there are multiple sensing modalities. Practical information fusion algorithms must approximate information theoretic quantities such as entropy and mutual information from finite number of samples from the sensors. Recently we have developed a framework, called performance-driven information fusion, that specifically accounts for the effect of finite sample estimation errors and bias on the information fusion task. The cornerstone for this framework is a large sample analysis of bias, variance, and probability distribution that applies to a general class of information divergence measures including /Csisz\'ar's / f-divergence, Shannon's mutual information, and R\'enyi's entropy. Under this framework information fusion algorithms can be implemented that incorporate error control, and for which one can optimize feature selection and specify optimal tuning parameters such as kernel bandwidth. This talk will introduce this framework and apply it to several applications in multichannel sensor processing.
09:30 - 10:45
High dimensional covariance estimation
- 9:30 The breakdown point of signal subspace estimation
- 9:45 Hypothesis Testing in High-Dimensional Space with the Sparse Matrix Transform
- 10:00 On Toeplitz and Kronecker Structured Covariance Matrix Estimation
- 10:15 Robust Shrinkage Estimation of High-dimensional Covariance Matrices
- 10:30 Distributed covariance estimation in Gaussian graphical models
Low rank matrix approximation
- 9:30 Order-preserving factor discovery from misaligned data
- 9:45 On Positioning via Distributed Matrix Completion
- 10:00 Robust Principal Component Analysis?
- 10:15 Subspace-Augmented MUSIC for Joint Sparse Recovery with Any Rank
- 10:30 Nonparametric Bayesian Matrix Completion
10:45 - 11:00
Coffee break Wed AM
11:00 - 12:00
Multichannel DSL communication systems
- 11:00 Convergence Analysis of Adaptive Partial FEXT cancellation precoder for multichannel downstream VDSL
- 11:20 Frequency domain crosstalk canceling between VDSL2 systems with different symbol rates
- 11:40 Vectored VDSL from a Practical Perspective
12:00 - 13:30
Lunch Wed
13:30 - 15:30
Poster session III
- A recursive model for partially correlated chi^2 targets
- The Polynomial Predictive Gaussian Mixture MeMBer Filter
- Expected Likelihood Support for Deterministic Maximum Likelihood DOA Estimation
- Covariance-informed detection in compound-Gaussian clutter without secondary data
- A Low Complexity STAP for Reverberation Cancellation in Active Sonar Detection
- A Migrating Target Indicator for Wideband Radar
- A Computationally Efficient Blind Estimator Of Polynomial Phase Signals Observed By A Sensor Array
- Passive Radar Imaging of Moving Targets with Sparsely Distributed Receivers
- Two-Dimentional Direction-of-Arrival Estimation of Coherent Signals with L-Sharped Array
- Steering Vector Modeling for Polarimetric Arrays of Arbitrary Geometry
- Parametric Joint Detection-Estimation of the Number of Sources in Array Processing
15:30 - 16:30
Plenary 6: Direct Position Determination and Sparsity in Localization Problems
Anthony. J. Weiss, Tel Aviv University, Israel
The most common methods for location of communications/radar transmitters are based on measuring a specified parameter such as signal Angle of Arrival (AOA), Time of Arrival (TOA), Received Signal Strength (RSS) or Differential Doppler (DD). The measured parameters are then used to estimate the transmitter location. Since the AOA/TOA/RSS/DD measurements are done independently, without using the constraint that all measurements must correspond to the same transmitter, the location estimate is suboptimal. Optimal localization is obtained by a single step which uses all the observations together in order to estimate the emitter position. We refer to single-step localization as Direct Position Determination (DPD). Although this principle is known for long time the signal processing community overlooked its potential benefits for long time. In this talk we will compare the DPD with two-step algorithms. We will show and explain why under ideal conditions such as high SNR the DPD is equivalent to two-step algorithms. However, under low SNR, jamming and other interferences the DPD provide better results. Further, we will show that DPD can overcome well known limitations on the number of sources associated with AOA. In the second part of the talk we will show how we can harness recent developments in sparsity theory to handle outliers in localization measurements. Surprisingly, under known limitations on the number of outliers, we can obtain the exact emitter location. Further, sparsity can also be used to find the location of sources by efficient linear programming or Second Order Cone programming.