Welcome to the webpage of the Adaptive Signal Processing and Information Theory Research Group, directed by Prof. John MacLaren Walsh of the Department of Electrical and Computer Engineering, Drexel University.

Some of the broad areas in which we conduct research include:

News

10/28/2016

Dr. Walsh presented "A Computationally Enabled Theory of Network Coding" in the Rocky Mountain Algebraic Combinatorics seminar series at Colorado State University Program , Slides.

09/28/2016

Solmaz Torabi presented her work "Distributed Lossy Interactive Function Computation" at the 54th Annual Allerton Conference on Communication, Control and Computing, Urbana, IL, USA. Program, Paper, slides

09/12/2016

Dr. Walsh presented "Symmetries in the Entropy Space" at the 2016 Information Theory Workshop (ITW 2016) Program ,Paper, Slides.

08/10/2016

Jayant Apte defended his Ph.D dissertation entitled "Algorithms for computing limits on information flow and storage in networks". slides. We thank the external committee members Dr. Anton Betten and Dr. Chao Tian for being part of the defense committee.

07/22/2016

Jayant Apte submitted his journal draft "Explicit Polyhedral Bounds on Network Coding Rate Regions via Entropy Function Region: Algorithms, Symmetry, and Computation" to the IEEE Transactions on Information Theory (arxiv), which contains the theoretical and algorithmic description of our software Information Theoretic Converse Prover (ITCP).

07/12/2016

Dr. Walsh presented "Practical Interactive Scheme for Extremum Computation in Distributed Networks" at the IEEE International Symposium on Information Theory (ISIT2016), Barcelona, Spain Program, Paper, slides, slides

06/23/2016

Jie Ren defended his Ph.D dissertation entitled "Control Overhead Optimization in Wireless Resource Allocation Problems". slides.

05/15/2016

Jayant Apte submitted his journal draft "Constrained Linear Representability of Polymatroids and Algorithms for Computing Achievability Proofs in Network Coding" to the IEEE Transactions on Information Theory (arxiv), which contains the theoretical and algorithmic description of our software Information Theoretic Achievability Prover (ITAP).

05/05/2016

Mengke Hu and David Cinciruk submitted their journal draft "Improving Automated Patent Claim Parsing: Dataset, System, and Experiments" to Computational Linguistics. arxiv

04/06/2016

Yunshu Liu defended his Ph.D dissertation entitled "Extremal Entropy: Information Geometry, Numerical Entropy Mapping, and Machine Learning Application of Associated Conditional Independences". slides.

04/01/2016

Jie Ren finished his Ph.D. Thesis Proposal on "Control Overheads Optimization in Wireless Resource Allocation Problems".

03/30/2016

Mengke Hu finished her Ph.D. Thesis Proposal on "Computer Aided Patent Processing: Natural Language Processing, Machine Learning, and Information Retrieval".

02/25/2016

Dr. Walsh gave a seminar on Network Coding in the Electrical Engineering and Computer Science Department at MIT. slides.

02/18/2016

Dr. Walsh presented "Distributed Extremization : Fundamental Limits and Practical Schemes" at the Nexus of Information and Computation Theories at Henri Poincaré institute in Paris, France. Program, video.

02/17/2016

Dr. Walsh presented "Rate Regions for Network Coding: Computation, Symmetry, and Hierarchy" at the Nexus of Information and Computation Theories at Henri Poincaré institute in Paris, France. Program, video.

02/01/2016

Dr. Walsh presented "Network Coding: Computation, Heirarchy, and Symmetry" at the Information Theory and Applications Workshop (2016) at UC San Diego. Program, slides.

01/16/2016

Jie Ren, Bradford Boyle and Gwanmo Ku's journal paper "Overhead Performance Tradeoffs -- A Resource Allocation Perspective" was accepted at IEEE Transactions on Information Theory.

01/06/2016

Yunshu Liu finished his Ph.D. Thesis Proposal on "Mapping the Region of Entropic Vectors with Support Enumeration & Information Geometry".

12/8/2015

Yunshu Liu submitted his journal draft "Mapping the Region of Entropic Vectors with Support Enumeration & Information Geometry" to the IEEE Transactions on Information Theory. arxiv

11/10/2015

Solmaz Torabi presented "Computing and Communicating Functions over Sensor Networks" at our group meeting. slides.

11/03/2015

Qi Chen presented "An introduction to Secret Sharing" at our group meeting. slides.

09/30/2015

Yunshu Liu presented his work "Non-isomorphic Distribution Supports for Calculating Entropic Vectors" at the 53rd Annual Allerton Conference on Communication, Control and Computing, Urbana, IL, USA. Program, Paper, slides

07/21/2015

Congduan Li submitted his journal draft "On Multi-source Networks: Enumeration, Rate Region Computation, and Hierarchy" to the IEEE Transaction on Information Theory. arxiv

07/06/2015

Congduan's paper "Network Combination Operations Preserving the Sufficiency of Linear Network Codes" was accepted at the 2015 Information Theory Workshop (ITW 2015).

06/23/2015

Congduan's paper "Computer Aided Proofs for Rate Regions of Independent Distributed Source Coding Problems" was presented at the 2015 International Symposium on Network Coding (NetCod 2015), Sydney, Australia. Program, Paper, slides

06/23/2015

Jayant's paper "Exploiting Symmetry in Computing Polyhedral Bounds on Network Coding Rate Regions" was presented at the 2015 International Symposium on Network Coding (NetCod 2015), Sydney, Australia. Program, Paper, slides

06/15/2015

John MacLaren Walsh presented "Symmetry in Network Coding: Formalization, Graph-Theoretic Characterization, and Computation" at the IEEE International Symposium on Information Theory (ISIT2015), Hong Kong, China. Program, Paper, slides

05/29/2015

Congduan Li defended his PHD thesis "Multi-source Multi-sink Hyperedge Networks: Enumeration, Rate Region Computation, and Hierarchy". slides.

04/27/2015, 04/29/2015

David Cinciruk presented his and Mengke's experiments on using Amazon Mechanical Turk for Data Collection in Parts of Speech Tag Correction for Patent Claims at our group meeting. slides.

04/13/2015, 04/15/2015

Yunshu Liu presented "An Introduction to Sum-Product Networks" at our group meeting.

03/30/2015

Jayant's paper "Symmetry in Network Coding" was accepted at the 2015 IEEE International Symposium on Information Theory (ISIT 2015).

03/09/2015, 03/30/2015,04/01/2015

Solmaz Torabi presented "The Role of Feedback in Communications" at our group meeting. slides.

02/23/2015, 02/25/2015

David Cinciruk presented "Patent Summarization and Paraphrasing" at our group meeting. slides.

02/09/2015, 02/11/2015

Mengke Hu presented "Patent Maintenance Recommendation System" at our group meeting. slides.

01/14/2015, 01/21/2015

Jayant Apte presented McKay's algorithm for isomorph-free exhaustive generation (Based on the paper Isomorph-free exhaustive generation, Journal of Algorithms, 26 (1998) 306-324 by B. D. McKay) at our group meeting. slides.

01/13/2015

Congratulations to Solmaz Torabi for passing her Ph.D. candidacy exam on Source Coding and Function Computation. slides.

11/25/2014

Congduan Li visited the Institute of Network Coding at the Chinese University of Hong Kong from Nov 3, 2014 to Jan 2, 2015, and gave a seminar on Nov 25, 2014.Video .

11/17/2014, 11/19/2014

Jayant Apte presented "Solving Rota's Conjecture Part 1: Graph and Matroid WQO Theorems" at our group meeting. slides.

11/03/2014,11/05/2014,11/10/2014,11/12/2014

Jie Ren presented "An Introduction to Communication Complexity" at our group meeting. slides

10/20/2014, 10/22/2014

Mengke Hu and David Cinciruk presented their experiments on patent analysis at our group meeting.

10/20/2014, 10/22/2014

Yunshu Liu presented "Entropy Region and Convolution" (from a manuscript by František Matúš and Lászlo Csirmaz)at our group meeting. slides.

10/15/2014

Congduan Li finished his Ph.D. Thesis Proposal on "Multiterminal Networks: Rate Regions, Codes, Computations and Forbidden Minors". slides .

10/03/2014

Congduan Li presented "Network Embedding Operations Preserving the Insufficiency of Linear Network Codes" at the 52nd Annual Allerton Conference on Communication, Control and Computing, Urbana, IL, USA. Program, Paper, slides

09/29/2014, 10/01/2014

Jayant Apte presented "Partition Symmetrical Entropy Functions Part 1" (based on a paper by Qi Chen and Raymond W. Yeung) at our group meeting. slides.

09/22/2014,09/24/2014

Congduan Li presented "U2,4 - the only forbidden minor for binary matroids" at our group meeting. slides

08/04/2014, 08/06/2014

Mengke Hu and David Cinciruk presented their patent analysis experiment at our group meeting. slides.

07/28/2014,07/30/2014

Jie Ren presented an "Introduction to Quantization Design" at our group meeting. slides

07/21/2014, 07/23/2014

Solmaz Torabi presented an introduction to Mean Field Theory at our group meeting. slides.

07/01/2014

Jayant Apte presented "Algorithms for Computing Network Coding Rate Regions via Single Element Extensions of Matroids" at the IEEE International Symposium on Information Theory (ISIT2014), Honolulu, HI, USA. Program, Paper, slides

06/17/2014, 06/19/2014

Jayant Apte presented "Exploiting Symmetry in Linear Programming" at our group meeting. slides.

06/10/2014, 06/12/2014

Solmaz Torabi presents an overview of Free Energy Approximation at our group meeting. slides.

05/21/2014

Gwanmo Ku defended his PHD thesis on "Efficient Control Signaling for Resource Allocation". slides.

05/06/2014, 05/13/2014

Yunshu Liu presented "Dual Decomposition for Inference" (based on papers by D. Sontag, A. Globerson and T. Jaakkola) in our group meeting. slides.

04/29/2014, 05/01/2014

Mengke Hu and David Cinciruk presented an "Introduction to the Patent Field" at our group meeting. slides.

04/22/2014,04/24/2014

Jie Ren presented an introduction to Space Time Coding at our group meeting. slides

04/15/2014

Congduan Li presented "The simplest index coding problem requiring a non-Shannon inequality" at our group meeting. slides

03/19/2014

Jayant Apte presented "Exact Pepair Problems with Multiple Sources" at The 48th annual IEEE Conference on Information Sciences and Systems(CISS) at Princeton, NJ, USA. Program, Paper, slides

03/19/2014

Bradford D. Boyle presented "Distributed Scalar Quantizers for Subband Allocation" at The 48th annual IEEE Conference on Information Sciences and Systems(CISS) at Princeton, NJ, USA. Program, Paper, slides

03/19/2014

Jie Ren presented "Interactive Communication for Resource Allocation" at The 48th annual IEEE Conference on Information Sciences and Systems(CISS) at Princeton, NJ, USA. Program, Paper, slides

03/04/2014, 03/06/2014

Yunshu Liu presented an introduction to Independence Models with a focus on Gaussian distributional framework (based on papers by Petr Simecek and Radim Lnenicka) in our group meeting. slides.

02/25/2014, 02/27/2014

Jayant Apte presented "Polyhedral Description Conversion up to Symmetries" (from a thesis by Thomas Rehn) at our group meeting. slides.

02/18/2014, 02/20/2014

Congduan Li presented "An equivalence between network coding and index coding" (A paper by Effros, Rouayheb, Langberg) at our group meeting. slides

02/11/2014

Dr. Walsh presented "Calculating rate regions for network coding and distributed storage via polyhedral projection and representable matroid enumeration" at the Information Theory and Applications Workshop (2014) at UC San Diego. Program,slides.

12/16/2013

Gwanmo Ku submitted "Resource Allocation and Link Adaptation in LTE & LTE Advanced: A Tutorial" to the IEEE Communications Surveys and Tutorials on December 16, 2013.

11/26/2013

Jayant Apte presented "Entropic Inequalities and Marginal Problems" at our group meeting. slides.

10/29/2013, 11/21/2013

Alexander Erick Trofimoff presented an introduction to analytical approaches to enumerating binary matroids with focus on the Burnside's lemma in our group meeting.

10/17/2013, 10/22/2013

Yunshu Liu presented "Information Geometric view of Belief Propagation" at our group meeting. slides.

10/03/2013

Congduan Li presented "Matroid bounds on the Region of Entropic Vectors" at the 51st Annual Allerton Conference on Communication, Control and Computing at Urbana, IL, USA. Program, Paper, slides

09/13/2013

Dr. Walsh presented "Bounding the Entropic Region via Information Geometry" at the 2013 IEEE Information Theory Workshop at Seville, Spain. Program, Paper, slides

08/08/2013, 08/09/2013

Alexander Erick Trofimoff presented an introduction to Matroid representations by partitions at our group meeting.

07/16/2013, 07/30/2013, 08/01/2013

Yunshu Liu presented an "Graphical Models and Message Passing" at our group meeting. slides.

07/23/2013, 07/25/2013

Congduan Li presented an introduction to Matroid bounds on the Region of entropic vectors at our group meeting.

07/09/2013, 07/11/2013

Jayant Apte presented "Network Coding for Distributed Storage Systems" at our group meeting.slides

06/08/2013

Congduan Li presented "A new computational approach for determining rate regions and optimal codes for coded networks" at the 2013 IEEE International Symposium on Network Coding(NetCod 2013) at Calgary, Canada. Program, Paper,slides,Poster, Video.

05/30/2013

Bradford Boyle presented "Channel Dependent Adaptive Modulation and Coding without Channel State Information at the Transmitter" at the 38th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2013) at Vancouver, Canada. Program, slides, Paper.

05/14/2013, 05/17/2013, 05/21/2013

Gwanmo Ku presented an introduction to Limited Feedback in Wireless Communication Systems at our group meeting.

04/26/2013,04/30/2013, 05/03/2013, 05/07/2013

Jie Ren presented an introduction to Variable-Rate Channel Capacity at our group meeting. slides

04/16/2013

Dr. Walsh presented "Entropic Vectors: Polyhedral Computation and Information Geometry" at the First Workshop on Entropy and Information Inequalities in Hong Kong. Program, slides, Video.

03/26/2013, 03/29/2013

Jayant Apte presented an "Polyhedral Description Conversion Up to Symmetries with a Focus on Group Theory" at our group meeting.slides

03/22/2013

Dan Venutolo presented an introduction to Non-Shannon Information Inequalities of Four Random Variables in group meeting.

03/13/2013, 03/15/2013

Yunshu Liu presented "Non-Shannon Information Inequalities of Four Random Variables" at our group meeting. slides.

03/08/2013

David Cinciruk presented "Nuisance Attribute Projection" at our group meeting.

03/06/2013

David Cinciruk presented "Support Vector Machines and Speaker Verification" at our group meeting. slides.

02/27/2013, 03/01/2013

Jie Ren presented "Incremental Coding over MIMO Channels" at our group meeting.

02/20/2013, 02/22/2013

Yunshu Liu presented "Conditional Independence Relations" at our group meeting. slides.

02/11/2013

Dr. Walsh presented "Entropic Vectors: Polyhedral Computation and Information Geometry" at the Information Theory and Applications Workshop at UC San Diego. slides.

02/06/2013, 02/08/2013

Mengke Hu presented "Joint Factor Analysis" at our group meeting. slides.

01/30/2013, 02/01/2013

Congduan Li presented "Inequalities for Shannon Entropy and Linear ranks" at our group meeting. slides.

01/25/2013

Gwanmo Ku presented "OFDMA Cross Layer Resource Control" at our group meeting. slides.

01/16/2013,01/18/2013, 01/23/2013

Jie Ren presented an introduction to Rateless Codes at our group meeting. slides.

01/11/2013

David Cinciruk presented an overview of Feature mapping at our group meeting. slides.

01/09/2013

Mengke Hu presents a comparison between JFA, FDIC and fNAP at our group meeting. slides.

12/19/2012

Dr. Walsh presented "Overhead Performance Tradeoffs in Distributed Wireless Networks" at the AFOSR Complex Networks Program Review at Washington, D.C. slides.

12/05/2012

Congduan Li gave a briefing of the senior design project that the group was advising at our group meeting.

11/30/2012

Gwanmo Ku presented "Overview of Gaussian MIMO BC" at our group meeting. slides.

11/14/2012,11/16/2012, 11/28/2012

Jie Ren presented "Coding for Computing" at our group meeting. slides.

10/17/2012, 10/19/2012, 10/24/2012, 11/09/2012

Gwanmo Ku presented an introduction to general broadcast channel and dirty paper coding at our group meeting. slides.

10/10/2012, 10/12/2012

Mengke Hu presented "Joint Factor Analysis for Speaker Verification" at our group meeting. slides.

10/03/2012, 10/05/2012

Jayant Apte presented an introduction to Polyhedral Computation at our group meeting. slides.

08/15/2012, 08/17/2012,08/22/2012,08/27/2012,08/29/2012

Jie Ren presented an introduction to Interactive Communication at our group meeting.slides.

08/2012

ASPITRG welcomes its newest member, Jie Ren.

08/03/2012, 08/08/2012,08/10/2012

Emmanuel Oyekanlu presented "A Review of Special Topics on Coding for Collaborative Estimation on Distributed Networks" at our group meeting.slides.

07/25/2012, 08/01/2012

Mengke Hu presented "Log Spectra Enhancement for Speaker Verification" at our group meeting. slides.

07/13/2012, 07/17/2012, 07/20/2012

David Cinciruk presented an introduction to Nuisance attribute projection (NAP) at our group meeting. slides.

06/29/2012, 07/11/2012

Jayant Apte presented an introduction to Lexicographic Reverse Search (LRS) at our group meeting. slides.

06/22/2012, 06/27/2012

Mengke Hu presented an introduction to Autotools at our group meeting. slides.

06/15/2012

Gwanmo Ku presented an overview of adaptive modulation and coding in LTE at our group meeting. slides.

06/2012

ASPITRG welcomes its newest member, Mengke Hu.

06/08/2012

Jayant Apte presented an introduction to CUDA at our group meeting. slides.

05/25/2012, 06/01/2012

Congduan Li presented an introduction to the construction of networks from matroids at our group meeting. slides.

05/11/2012

Congduan Li presented an introduction to the fundamental problems in networks at our group meeting. slides.

04/27/2012

Gwanmo Ku presented "Scheduling in LTE" at our group meeting. slides.

04/13/2012, 04/20/2012

Yunshu Liu presented "Manifold of probability distribution" at our group meeting. slides.

04/2012

ASPITRG welcomes its newest member, Jayant Apte.

4/2/2012:

ASPITRG has received a grant from the Air Force Office of Scientific Research to study the fundamental relationship between the amount of overhead control information and resource allocation performance in wireless networks. The research effort will be a collaboration between Leonard J. Cimini (PI - Univ. of Delaware), Javier Garcia-Frais (co-PI - Univ. of Delaware), John MacLaren Walsh (PI - Drexel University), and Steven Weber (co-PI - Drexel University).

03/01/2012

Sivagnanasundaram Ramanan's paper "Practical Codes for Collaborative Estimation" is scheduled to appear in the June or July issue of the IEEE Transactions on Signal Processing 2012.

02/24/2012

David Cinciruk presented an introduction to Speaker Recognition at our group meeting. slides.

02/10/2012, 02/17/2012

Yunshu Liu presented an introduction to Information Geometry at our group meeting. slides.

02/07/2012

Dr. Walsh presented "Characterizing the Region of Entropic Vectors via Information Geometry" at the Information Theory and Applications Workshop at UC San Diego.

01/20/2012, 01/27/2012

Yunshu Liu presented an overview of differential geometry at our group meeting.

11/18/2011,12/02/2011

Congduan Li presented "Matroid Theory with a Focus on Matroid Operations" at our group meeting. slides.

11/11/2011

Gwanmo Ku presented "Resource Allocation in LTE" at our group meeting slides.

11/4/2011

Gwanmo Ku presented an overview of the structure of the PHY in the LTE 4G standard at our group meeting. slides.

10/21/2011,10/28/2011

Congduan Li presented an introduction to matroid theory at our group meeting. slides.

9/20/2011

ASPITRG welcomes its newest member, Emmanuel Oyekanlu.

8/24/2011

ASPITRG welcomes its newest member, Yunshu Liu.

7/28/2011

Sivagnanasundaram Ramanan defended his Ph.D. Dissertation "Collaborative Estimation in Networks".

6/14/2011

Dr. Walsh and the ASPITRG have been awarded the CAREER award by the National Science Foundation for the project " Entropy Geometry in Variational Inference Signal Processing ".

6/12/2011

ASPITRG welcomes its newest member, Congduan Li.

6/10/2011

ASPITRG Undergraduate Researcher Linda McLaughlin bids farewell to ASPITRG and begins graduate research career at Cornell University.

6/08/2011

Ciira Maina defends his Ph.D. Dissertation " Approximate Bayesian Inference for Robust Speech Processing ".

6/01/2011

Dr. Walsh and Dr. Weber's paper " A Recursive Construction of the Set of Binary Entropy Vectors and Related Algorithmic Inner Bounds for the Entropy Region" has been accepted for publication in the IEEE Transactions on Information Theory.

5/27/2011

Sivagnanasundaram Ramanan submitted the manuscript " Practical Codes for Collaborative Estimation " to the IEEE Transactions on Signal Processing.

5/02/2011

Dr. Walsh, together with Dr. Weber, Dr. de Oliveira, Dr. Muriel Medard (MIT), and Dr. Atilla Eryilmaz (Ohio State Univ.), guest edited the May 2011 issue of the IEEE Journal on Selected Areas in Communications. The issue was about rate delay tradeoffs at the application and transport layers.

3/29/2011

Dr. Walsh and Dr. Weber submitted a revised version of the manuscript " A Recursive Construction of the Set of Binary Entropy Vectors and Related Algorithmic Inner Bounds for the Entropy Region " to the IEEE Transactions on Information Theory.

3/14/2011

Ciira wa Maina submitted the paper " Log Spectra Enhancement using Speaker Dependent Priors for Speaker Verification " to the IEEE Transactions on Audio, Speech, and Language Processing.

2/4/2011

Ciira wa Maina's paper "Compensating for Noise and Mismatch in Speaker Verification Systems Using Approximate Bayesian Inference" has been selected to appear at CISS 2011.

1/18/2011

Sivagnanasundaram Ramanan's paper "Practical Codes for Lossy Compression when Side Information May be Absent" and Ciira wa Maina's paper "Log Spectra Enhancement using Speaker Dependent Priors for Speaker Verification" have been selected to appear at IEEE ICASSP 2011.

1/03/2011

Dr. Walsh to speak about collaborative estimation algorithms at the Information Theory and Applications Workshop at UC San Diego.

12/06/2010

Gwanmo Ku's paper titled " Power amplifier nonlinearity effects on OFDM subcarrier transmit beamforming" has been accepted to the IEEE Wireless Communications and Networking Conference (WCNC), 2011.

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