 
List of publications
Journal Papers and Book Chapters
38. A.W. Bohannon, B.M. Sadler, R.V. Balan, A Filtering Framework for TimeVarying Graph signals, .pdf to appear (2018).
37. R. Balan, K. Okoudjou, A. Poria, On a Feichtinger Problem, .pdf to appear in Operators and Matrices (2018).
36. R. Balan, M. Singh, D. Zou, Lipschitz Properties for Deep Convolutional Networks, .pdf, available online arXiv:1701.05217 [cs.LG], to appear in Contemporary Mathematics 2018.
35. R. Balan, M. Begue, C. Clark, K. Okoudjou, Optimization methods for frame conditioning
and application to graph Laplacian scaling, .pdf, available online arXiv:1609.02233 [math.FA], to appear in "Novel methods in harmonic analysis with applications to numerical analysis and data processing", Lecture Notes ANHA Series, I.Pesenson and all Eds., Birkhauser 2017.
34. R. Balan, D. Zou, On Lipschitz Analysis and Lipschitz Synthesis for the Phase Retrieval Problem, .pdf, available online arXiv:1506.02092 [math.FA],Linear Algebra and Applications 496, 152181 (2016).
33. R. Balan, Frames and Phaseless Reconstruction, .pdf file and online 1601.0345v1 [math.FA], AMS Short Course at the Joint Mathematics Meetings, San Antonio, January 2015. to appear in Proceedings of Symposia in Applied Mathematics, AMS 2016.
32. R. Balan, D. Zou, On Lipschitz Inversion of Nonlinear Redundant Representations, .pdf file, Contemporary Mathematics 650, "Trends in Harmonic Analysis and Its Applications", 1522, 2015.
31. R. Balan, Stability of Frames Which Give Phase Retrieval, .pdf , to appear in the Houston Journal of Mathematics 2017.
30. R. Balan, Reconstruction of Signals from Magnitudes of Redundant Representation: The Complex
Case, available online arXiv:1304.1839v1 [math.FA] ,
Apr. 2013, Foundations of Computational Mathematics, vol. 16(3), (2016) 677721.
29. R. Balan, Y. Wang, Invertibility and Robustness of Phaseless Reconstruction, available online arXiv:1308.4718 [math.FA] , 21 Aug 2013, Appl. Comp. Harm. Anal. vol. 38, no. 3, (2015) 469488.
28. R. Balan, J.G. Christensen, I.A. Krishtal, K.A. Okoudjou, J.L. Romero, Multiwindow Gabor frames in amalgam space, Math. Res. Lett., vol. 21, no. 1, (2014) 5569 link
27. R.Balan, P.Casazza, Z.Landau, Redundancy of Localized Frames,
Israel Journal of Mathematics vol. 185 (2011) 445476 .pdf ref
26. R.Balan, I.Krishtal, An Almost Periodic Noncommutative Wiener's Lemma, Journal of Mathematical Analysis and Applications, vol. 370, no. 2 (2010) 339349 .pdf ref
25. R.Balan, B.G.Bodmann, P.G.Casazza, D.Edidin, Painless Reconstruction from Magnitudes of Frame Coefficients,
J.Fourier Anal..Appl., vol. 15, no. 4 (2009) 488501 .pdf ref,
24. F.Meshkati, V.Poor, S.Schwartz, R.Balan, EnergyEfficient Resource Allocation
in Wireless Networks with QualityofService Contraints, IEEE Trans.
on Communications vol. 57, no. 11 (2009) .pdf
23. R.Balan, A Noncommutative Wiener Lemma and A Faithful Tracial State on
Banach Algebra of TimeFrequency Operators, Trans.Amer.Math.Soc., vol.
360, no. 7, (2008) 39213941 TAMS site, .pdf or .pdf (ESI preprint)
22. R.Balan, Z.Landau, Measure Functions for Frames, Journal of Functional Analysis, 252 (2007), 630676, .pdf, DOI
21. R.Balan, P.Casazza, D.Edidin, Equivalence of Reconstruction from the Absolute
Value of the Frame Coefficients to a Sparse Representation Problem, IEEE
Sig. Proc. Letters vol.14, no.5 (2007), 341343 .pdf
20. R.Balan, P.Casazza, D.Edidin, G.Kutyniok, A New Identity for Parseval
Frames, Proc. Amer. Math. Soc., 135 (2007), 10071015 .pdf ref
19. R.Balan, P.Casazza, C.Heil, Z.Landau, Density, Overcompleteness, and
Localization of Frames. II Gabor Frames, J.Fourier Anal. Applic., Vol.12, No.3,
(2006) 309344 .pdf ref
18. R.Balan, P.Casazza, C.Heil, Z.Landau, Density, Overcompleteness, and
Localization of Frames. I Theory, J.Fourier Anal. Applic., Vol.12, No.2, (2006)
105143, .pdf ref
17. R.Balan, P.Casazza, D.Edidin, On Signal Reconstruction
without Noisy Phase, Appl. Comp. Harm. Anal., 20 (2006) 345356 .pdf ref
16. S.Rickard, R.Balan, V.Poor, S.Verdu, Canonical timefrequency,
timescale, and frequencyscale representations of timevarying channels, J. Comm. Infor. Syst.
vol.5, no.5 (2005) 130 .pdf
15. R.Balan, J.Rosca, S.Rickard, Equivalence Principle for Optimization of
Sparse versus LowSpread Representations for Signal estimation in Noise, International Journal in Imaging Systems and
Technology vol.15, no.1, (2005) 1017 .pdf
14. R.Balan, P.Casazza, C.Heil, Z.Landau, Excesses of Gabor Frames, Appl.
and Comp. Harm. Anal., vol. 14, (2003) 87106 .pdf ref
13. R.Balan, P.Casazza, C.Heil, Z.Landau, Deficits and Excesses of Frames,
Advances and Computational Mathematics, vol. 18, (2003) 93116 .pdf
12. R.Balan, I.Daubechies, Optimal Stochastic Approximations and Encoding
Schemes using WeylHeisenberg Sets, chapter in "Gabor Analysis: Theory and
Applications", Eds. H.Feichtinger and T.Strohmer, Birkhauser 2002 .pdf
11. R.Balan, I.Daubechies, V.Vaishampayan, The Analysis and Design of
Windowed Fourier Frame based Multiple Description Source Coding Schemes, in
IEEE Trans.on IT, vol.46, no.7, (2000) 24912537 .pdf
10. R.Balan, G.Taubin, 3D Mesh Geometry Filtering Algorithms for Progressive
Transmission Schemes, ComputerAided Design, vol.32, no.13, (2000) 825846 .pdf ref
9. R.Balan, Density and Redundancy of the Noncoherent WeylHeisenberg
Superframes, Contemporary Mathematics , AMS Providence R.I. (1999) .pdf
8. R.Balan, Equivalence Relations and Distances between Hilbert Frames,
Proceedings of the AMS, vol.127 no.8, (1999) 23532366 .pdf
7. R.Balan, Extensions of NoGo Theorems to Many Signal Systems,
Contemporary Mathematics 216, AMS Providence R.I. (1998), 314 .pdf
6. R.Balan, An Uncertainty Inequality for Wavelet Sets, Applied and
Computational Harmonic Analysis, Vol.5, no.1, (1998) 106108 .pdf ref
5. R.Balan, Stability Theorems for Fourier Frames and Wavelet Riesz Bases,
Journal of Fourier Analysis and Applications, Vol.3, no.5, (1997), 499504 .pdf
4. R.Balan, Horseshoe and Analytic Nonintegrability of a Spinless
Axialsymmetric Rigid Body in Central Newtonian Field, Celestial Mechanics
and Dynamics Astronomy, vol.63 (1995), 5979 .pdf
3. R.Balan, D.Aur, An OnLine Robust Stabilizer, Journal in Guidance,
Control and Dynamics, (18) no.3, (1995), 642644 .pdf
2. R.Balan, Homogeneous Polynomial Approximations of Nonlinear Control
Systems, Revue Roumaine de Science Techniques, serie Electrotechnique et
Energetique, (39) no.4, (1994), 503511 .pdf
1. R.Balan, A Note about Integrability of Distributions with Singularities,
Bollettino U.M.I. (7) 8A (1994), 335344 .pdf
Peer Reviewed Conference Proceedings
49. R. Balan, The Fisher Information Matrix and the CRLB in a NonAWGN Model for the Phase Retrieval Problem, SampTA 2015, Washington DC, May 2015 .pdf
48. Yenming M. Lai, R. Balan, H. Claussen, J. Rosca, Optimal Beampattern Design For Very Large Sensor Arrays
With Sparse Sampling, 47th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, Nov. 2013
.pdf
47. Yenming M. Lai, R. Balan, H. Claussen, J. Rosca, Broadband Sensor Location Selection using Convex Optimization
In Very Large Scale Arrays, WASPAA 2013 Workshop, New Paltz, NY, Oct. 2013
.pdf
46. R. Balan, Stability of Phase Retrievable Frames,
SPIE Wavelets Applications in Signal and Image Processing XII, San Diego Aug. 2013
.pdf
45. M.Scharrenbroich, M.Zatman, R.Balan, Performance of a Practical TwoStep Detector for Nonfluctuating Targets,
Proceedings SAM 2012, .pdf
44. M.Scharrenbroich, M.Zatman, R.Balan, Cooperative Networked Radar: The TwoStep Detector",
45th Asilomar Conference on Signals, Systems and Computers, November 9 2011, .pdf
43. R.Balan, On Signal Reconstruction from Its Spectrogram, CISS 2010, Princeton, NJ, March 2010
.pdf
42. R.Balan, A Nonlinear Reconstruction Algorithm from Absolute Value of Frame Coefficients for Low
Redundancy Frames, SampTA, Marseille, France, May 2009
.pdf
41. R.Balan, Information Theory based Estimator of the Number of Sources in a Sparse Linear Mixing
Model, CISS 2008, Princeton, NJ, March 2008
.pdf
40. B.G.Bodmann, P.Casazza, R.Balan, Frames for Linear Reconstruction without Phase,
CISS 2008, Princeton, NJ, March 2008 .pdf
39. R.Balan, Estimator for Number of Sources using a Minimum Description Length Criterion
for Blind Sparse Source Mixtures, ICA 2007, London, UK, September 2007
.pdf
38. R.Balan, B.G.Bodmann, P.G.Casazza, D.Edidin, Fast Algorithms for Signal Reconstruction
without Phase, SPIE Wavelets Applications in Signal and Image Processing XII, San Diego
Aug. 2007 .pdf
37. R.Balan, B.G.Bodmann, P.G.Casazza, D.Edidin, Painless Reconstruction from Magnitudes
of Frame Coefficients, SPIE Wavelets Applications in Signal and Image Processing XII, San Diego
Aug. 2007 .pdf
36. N.Fan, J.Rosca, R.Balan, Speech Noise Estimation using Enhanced Minima Controlled
Recursive Averaging, Proceedings ICASSP 2007, Hawaii USA, April 2007..pdf
35. R.Balan, J.Rosca, MAP Source Separation using Belief Propagation Networks,
40th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, October 2006
.pdf
34. F.Meshkati, H.V.Poor, S.C.Schwartz, R.Balan, EnergyEfficient Power
and Rate Control with QoS Constraints: A GameTheoretic Approach, Int. Wireless
Comm. Mobile. Comp. (IWCMC) Conf. 2006  CrossLayer Design and Protocols, Vancouver,
Canada, July 2006 .pdf
33. R.Balan, J.Rosca, Source Separation using Sparse Discrete Prior Models,
ICASSP 2006, Toulouse, France, May 2006 .pdf
32. R.Balan, J.Rosca, Source Convolutive Demixing with Sparse Discrete Prior Models
for Markov Sources, ICA 2006, Charleston SC USA, May 2006
.pdf
31. P.Bogdan, R.Balan, J.Rosca, Statistical Signal Processing for Novelty Detection,
CSCS 2005, Bucharest, Romania, May 2005 .pdf
30. N.Fan, J.Rosca, R.Balan, Speaker Identification with Combined Threshold
Identification FrontEnd & UBM, 4th IEEE Workshop on Automatic Identification
Advanced Technology (AutoID 2005), Buffalo NY 2005 .pdf
29. P.Casazza, R.Balan, D.Edidin, G.Kutyniok, Decomposition of frames and a new
frame identity in SPIE Wavelets Applications in Signal and Image Processing
XI, vol.5914 , (2005)
28. R.Balan, P.Casazza, C.Heil, Z.Landau, Excess of Parseval frames in
SPIE Wavelets Applications in Signal and Image Processing XI, vol.5914 , (2005)
.pdf
27. R.Balan, P.Casazza, D.Edidin, On Signal Reconstruction from absolute
value of frame coefficients in SPIE Wavelets Applications in Signal and
Image Processing XI, vol.5914 , (2005).pdf
26. B.Grundlehner, J.Lecocq, R.Balan, J.Rosca, Performance Assessment Method for
Speech Enhancement Systems, SPSDARTS 2005, Antwerp, Belgium, April 2005
.pdf
25. N.Fan, R.Balan, J.Rosca, Comparison of Wavelet and FFT based Single
Channel Speech Signal Noise Reduction Techniques, in Proceedings of SPIE
Industrial Applications of Wavelets Conference 2004, Philadelphia, PA, October
2004 .pdf
24. R.Balan, H.V.Poor, S.Rickard, S.Verdu, TimeFrequency and TimeScale
Canonical Representations of Doubly Spread Channels, in Proceedings of
EUSIPCO 2004, Vienna, Austria, September 2004 .pdf
23. L.Hong, J.Rosca, R.Balan,
Bayesian Single Channel Speech Enhancement Exploiting Sparseness in the ICA
Domain, in Proceedings of EUSIPCO 2004, Vienna, Austria, September 2004
.pdf
22. R.Balan, J.Rosca, C.Beaugeant, V.Gilg, T.Fingscheidt, Generalized
Stochastic Principle for Microphone Array Speech Enhancement and Applications to
Car Environments, in Proceedings of EUSIPCO 2004, Vienna, Austria, September
2004 .pdf
21. J.Rosca, C.Borss, R.Balan, Generalized Sparse Signal Mixing Model and
Application to Noisy Blind Source Separation, in Proceedings of ICASSP 2004,
Montreal, Canada, May 2004 .pdf
20. S.Rickard, C.Fearon, R.Balan, J.Rosca, MINUET: Musical Interference
Unmixing estimation Technique, in Proceedings of CISS 2004, Princeton NJ,
March 2004 .pdf
19. R. Balan, Z. Landau, Measure and Redundancy of Frames, in Proceedings of SPIE 2003, San Diego, CA 2003.
.pdf
18. J.Rosca, R.Balan, C.Beaugeant, MultiChannel Psychoacoustically Motivated
Speech Enhancement, in Proceedings of ICASSP 2003, Hong Kong China, April
2003 .pdf
17. R.Balan, J.Rosca, S.Rickard, Scalable NonSquare BSS in the Presence of
Noise, in Proceedings of ICASSP 2003, Hong Kong China, April 2003
.pdf
16. J.Rosca, R.Balan, S.Rickard, Scalable Audio Source Separation in the
Presence of Noise, in Proceedings of DAGA 2003, Aachen, Germany, June 2003
15. R.Balan, J.Rosca, S.Rickard, Nonsquare BSS under Coherent Noise by
Beamforming and TimeFrequency Masking, in Proceedings of ICA 2003, Nara
Japan, April 2003 .pdf
14. S.Rickard, R.Balan, J.Rosca, Blind Source Separation based on
SpaceTimeFrequency Diversity, in Proceedings of ICA 2003, Nara Japan,
April 2003 .pdf
13. R.Balan, J.Rosca, S.Rickard, A Stochastic Speech Model Supporting
WDisjoint Orthogonality, in Proceedings of 2003 CISS, Baltimore MD, March
2003 .pdf
12. J.Rosca, R.Balan, N.Fan, C.Beaugeant, V.Gilg, Multichannel Voice
Detection in Adverse Environments, in Proceedings of EUSIPCO 2002, Toulouse
FRANCE, September 2002 .pdf
11. R.Balan, J.Rosca, Microphone Array Speech Enhancement by Bayesian
Estimation of Spectral Amplitude and Phase, in Proceedings of IEEE Sensor
Array and Multichannel Signal Processing Workshop, Rosslyn VA, Aug. 2002
.pdf
10. S.Aalburg, C.Beaugeant, S.Stan, T.Fingscheidt, R.Balan, J.Rosca, Single
and TwoChannel Noise Reduction For Robust Speech Recognition in Car, in
Proceedings of ISCA Workshop, GERMANY, June 2002
.pdf
9. R.Balan, J.Rosca, S.Rickard, Robustness of Parametric Source Demixing in
Echoic Environments, in the Proceedings of the 3rd ICA and BSS Conference,
San Diego, CA, December 2001 .pdf
8. J.Rosca, N.Fan, R.Balan, RealTime Audio Source Separation by Delay and
Attenuation Compensation in the Time Domain, in the Proceedings of the 3rd
ICA and BSS Conference, San Diego, CA, December 2001 .pdf
7. S.Rickard, R.Balan, J.Rosca, RealTime TimeFrequency Based Blind Source
Separation, in the Proceedings of the 3rd ICA and BSS Conference, San Diego,
CA, December 2001 .pdf
6. J.Rosca, S.Sudarsky, R.Balan, D.Comaniciu, Mobile Interaction with Remote
Worlds: The Acoustic Periscope, in the Proceedings of IJCAI 2001
.pdf
5. R.Balan, J.Rosca, Statistical Properties of STFT Ratios for Two Channel
Systems and Applications to Blind Source Separation, in the Proceedings of
2nd ICA and BSS Conference 2000, Helsinki, FINLAND, June 2000
.pdf
4. R.Balan, Topological Obstructions to Localization Results in SPIE
Wavelets Applications in Signal and Image Processing VIII, vol. 4478, (2001)
184192 .pdf
3. R.Balan, Multiplexing of Signals using Superframes in SPIE Wavelets
Applications in Signal and Image Processing VIII, vol.4119 , (2000) 118129
.pdf
2. R.Balan, J.Rosca, S.Rickard, J.O’Ruanaidh, The Influence of Windowing on
Time Delay Estimates, in the Proceedings of the CISS 2000, Princeton NJ,
March 1517 2000 .pdf
1. R.Balan, A.Jourjine, J.Rosca, AR processes and sources can be
reconstructed from degenerate mixtures, in the Proceedings of the First
International Workshop on Independent Component Analysis and Signal Separation,
Aussois France, January 1115 1999, 467472 .pdf (see
also TR 703 below)
Books and Edited Volumes
1. Excursions in Harmonic Analysis , vol.1, T.D. Andrews, R. Balan, J.J. Benedetto, W. Czaja, K.A. Okoudjou Eds., Birkhauser 2013.
2. Excursions in Harmonic Analysis , vol.2, T.D. Andrews, R. Balan, J.J. Benedetto, W. Czaja, K.A. Okoudjou Eds., Birkhauser 2013.
3. Excursions in Harmonic Analysis , vol.3, R. Balan, M. Begue, J.J. Benedetto, W. Czaja, K.A. Okoudjou Eds., Birkhauser 2015.
4. Excursions in Harmonic Analysis , vol.4, R. Balan, M. Begue, J.J. Benedetto, W. Czaja, K.A. Okoudjou Eds., Birkhauser 2015.
5. Excursions in Harmonic Analysis , vol.5, R. Balan, J.J. Benedetto, W. Czaja, M. Dellatorre, K.A. Okoudjou Eds., Birkhauser 2017.
Patents
1. Separation of AR Sources from their
Single Channel Measurement, US Patent # 6,343,268, January 29, 2002
2,3.Optimal ratio estimator for multisensor systems, US Patent # 6,577,966,
June 10, 2003, and US Patent # 6,868,365, Mar 15, 2005
4. Method of denoising signal mixtures, US Patent # 6,901,363, May 31, 2005
5. Online Blind Source Separation”, US Patent # 6,954,494, October 11, 2005
6,7. Method and Apparatus for Noise Filtering, US Patent # 6,952,482, October 4,
2005, and US Patent # 7,110,944, September 19, 2006
8. Apparatus and Method for Estimating the Direction of Arrival of a Source
Signal using a Microphone Array, US Patent # 7,084,801, August 1, 2006
9. RealTime Audio Source Separation by Delay and Attenuation Compensation
in the Time Domain, US Patent # 7,088,831, August 8, 2006
10. Multichannel voice detection in adverse environments, US Patent# 7,146,315,
December 5, 2006
11. System and method for remotely experiencing a virtual environment,
US Patent# 7,149,691, December 12, 2006
12. Multichannel speech enhancement system and method based on psychoacoustic masking effects, US Patent# 7,158,933,
January 2, 2007
13. System and Method for Adaptive MultiSensor Arrays, US Patent# 7,218,741,
May 15, 2007
14. Method for eliminating an unwanted signal from a mixture via timefrequency masking, US Patent# 7,302,066,
November 27, 2007
15. System and method for nonlinear signal enhancement that bypasses a noisy phase of a signal, US Patent# 7,392,181,
June 24, 2008
16. System and method for nonsquare blind source separation under coherent noise by beamforming and timefrequency masking, US Patent# 7,474,756,
January 6, 2009
17. Method and Apparatus to Inspect Wireless Traffic and Mitigate Packet Elimination for
Wireless Saturation Avoidance, World Patent
WO 2010/002729 A1, January 7, 2010
18. Methods and apparatus for estimating collision probability in a wireless network, US Patent#
7,839,793, November 23, 2010
19. Method and apparatus to inspect wireless traffic and mitigate packet elimination for
wireless saturation avoidance, US Patent# 8,045,471, October 25, 2011
20. Method for congestion detection in packet transmission networks, US Patent# 8,737,213 , May 27, 2014
21. Method and Apparatus for Acoustic Area Monitoring by Exploiting Ultra Large Scale Arrays of Microphones, US Patent # 9,264,799, February 16, 2016
22. Broadband Sensor Location Selection Using Convex Optimizaton in Very Large Scale Arrays, US Patent# 9,615,172, April 4, 2017
Other Publications
13. A.W. Bohannon, J.O. Garcia, J.M. Vettel, R.V. Balan, Estimating Functional Connectivity from fMRI Data Using a FrequencySparse Multivariate Autoregressive Model, .pdf, Poster 2018.
12. A.W. Bohannon, B.M. Sadler, R.V. Balan, Learning Flexible Representations of Stochastic Processes on Graphs, .pdf Poster 2018.
11. R. Balan, The CramerRao Lower Bound in the Phase Retrieval Problem, .pdf
10. R. Balan, Nonlinear Frame Analysis and Phaseless Reconstruction, Lecture Notes for the Summer Graduate Program "Harmonic Analysis and Applications", at UMD, July 20August 7, 2015 .pdf
9. L.Driskell, Y.Gong, X.Hu, R.Jain, M.Nkengla, 802.11 WLAN MAC Layer Modeling, IMA 2007 Modeling Workshop .pdf
8. Bogdan Alexandru Vasile, AudioVideo Sensor Fusion based Person Recognition System, Universitatea "Politehnica" Bucharest, 2006 .pdf
7. MateiEugen Vasile, WLANbased Wireless Medium Surveillance System for Location
Estimation, University "Politehnica" Bucharest, 2006 .pdf
6. R.Balan, J.Rosca, A Spectral Power Factorization, Siemens Corporate
Research TR 703 2001 .pdf
5. R.Balan, Multiframes and Multi Riesz Bases: I. The General Theory and WeylHeisenberg
Case, Princeton University 1997 .ps
4. R.Balan, V.Ionescu, Absolute Stability Criteria for Nonlinear Affine Systems:
A KalmanYakubovickPopov Type Approach, University "Politechnica" of
Bucharest 1996 .pdf
3. R.Balan, Robustness Properties of Nonlinear Systems: Absolute Stability of
Linear Systems, University "Politehnica" of Bucharest, 1996
.pdf
2. R.Balan, An Extension of BarbashinKrasovskiLaSalle Theorem to a Class of
Nonautonomous Systems, Princeton University, 1995
.pdf
1. R.Balan, Codistributions with Singularities, Polytechnic Institute of
Bucharest, 1992 .pdf
Preprints available on Arxiv
1. R. Balan, Reconstruction of Signals from Magnitudes of Redundant Representations, available online
arXiv:1207.1134[math.FA] , July 2012.
Acknowledgment and Disclaimer
This material is based upon work supported in part by the National Science Fundation under Grants No. DMS0807896 , DMS1109498 , DMS1413249.
"Any opinion, findings and conclusions or recommendations expressed in this material are those of the author(s)
and do not necessarily reflect the viewes of the National Science Foundation (NSF)."
Some works have also been partially supported by ARO under contract no. W911NF1610008.

