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Author details

Wai Chen

Publications

38

Citations

121

Publications by Year

20062017

Co-Authors:

Onur AltintasShengwei CaiJasmine Chennikara-VargheseLuca DelgrossiFalko Dressler

Show All Co-Authors (26)

Wai Chen

Affiliation

China Mobile Internet-of-Things Institute

Publication Topics

Ad Hoc Networks,
Vehicular Networks,
Multicast,
Vehicular Communication,
Communication Protocol,
Diffusion Data,
Vehicular Ad Hoc Networks,
Position Information,
Vehicle Safety,
Group Of Nodes,
Local Information,
Local Services

Biography

Wai Chen (waichen@ieee.org) received his B.S. degree from Zhejiang University, and M.S., M.Phil., and Ph.D. degrees from Columbia University, New York. He is chief scientist of the China Mobile Research Institute and general manager of the China Mobile Internet-of-Things Institute. Previously he was VPGD of ASTRI, Hong Kong, and chief scientist and director at Telcordia (formerly known as Bellcore), New Jersey.(Based on document published on 13 December 2017).

Publications

38

Citations

121

Publications by Year

20062017

Co-Authors:

Onur Altintas
Shengwei Cai
Jasmine Chennikara-Varghese
Luca Delgrossi
Falko Dressler

Show All Co-Authors (26)

Author's Published Works

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Showing 1-25 of 27 results

Conferences (22)

Journals (4)

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B. Usevitch(11)
B.E. Usevitch(10)
Bryan Usevitch(5)
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Department of Electrical and Computer Engineering, University of Texas, El Paso, El Paso, TX, USA(8)
Department of Electrical Engineering, University of Texas, El Paso, El Paso, TX, USA(2)
PMB, El Paso, TX, USA(1)
Department of Electrical & Computer Engineering, University of Technology, El Paso, TX, USA(1)
Electrical and Computer Engineering Department, University of Texas, El Paso, El Paso, TX, USA(1)
3rd IEEE Signal Processing Education Workshop. 2004 IEEE 11th Digital Signal Processing Workshop, 2004.(2)
42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356)(2)
IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing(2)
1993 IEEE International Symposium on Circuits and Systems(1)
2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)(1)
IEEE(27)
Snowbird, UT, USA(4)
Pacific Grove, CA, USA(3)
Chicago, IL, USA(2)
Las Cruces, NM, USA(2)
Taos, NM, USA(2)
Wavelet Transform(9)
Bitstream(7)
Bitrate(6)
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Why ℓp-methods in signal and image processing: A fuzzy-based explanation

Fernando Cervantes;Bryan Usevitch;Vladik Kreinovich

2016 Annual Conference of the North American Fuzzy Information Processing Society (NAFIPS)

Year: 2016 | Conference Paper |

Cited by: Papers (1)

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In signal and image processing, it is often beneficial to use semi-heuristic ℓp-methods, i.e., methods that minimize the sum of the p-th powers of the discrepancies. In this paper, we show that a fuzzy-based analysis of the corresponding intuitive idea leads exactly to the ℓp-methods.Show More

Why ℓp-methods in signal and image processing: A fuzzy-based explanation

Fernando Cervantes;Bryan Usevitch;Vladik Kreinovich

2016 Annual Conference of the North American Fuzzy Information Processing Society (NAFIPS)

Year: 2016 | Conference Paper |

Rotation-invariance can further improve state-of-the-art blind deconvolution techniques

Fernando Cervantes;Bryan Usevitch;Vladik Kreinovich

2016 IEEE International Conference on Systems, Man, and Cybernetics (SMC)

Year: 2016 | Conference Paper |

Cited by: Papers (1)

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In many real-life situations, we need to reconstruct a blurred image in situations when no information about the blurring is available. This problem is known as the problem of blind deconvolution. There exist techniques for solving this problem, but these techniques are not rotation-invariant. Thus, the result of using this technique may change with rotation. So, if we rotate the image a little bi...Show More

Rotation-invariance can further improve state-of-the-art blind deconvolution techniques

Fernando Cervantes;Bryan Usevitch;Vladik Kreinovich

2016 IEEE International Conference on Systems, Man, and Cybernetics (SMC)

Year: 2016 | Conference Paper |

Fuzzy techniques provide a theoretical explanation for the heuristic ℓp-regularization of signals and images

Fernando Cervantes;Brian Usevitch;Leobardo Valera;Vladik Kreinovich;Olga Kosheleva

2016 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

Year: 2016 | Conference Paper |

Cited by: Papers (1)

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One of the main techniques used to de-noise and deblur signals and images is regularization, which is based on the fact that signals and images are usually smoother than noise. Traditional Tikhonov regularization assumes that signals and images are differentiable, but, as Mandelbrot has shown in his fractal theory, many signals and images are not differentiable. To de-noise and de-blur such images...Show More

Fuzzy techniques provide a theoretical explanation for the heuristic ℓp-regularization of signals and images

Fernando Cervantes;Brian Usevitch;Leobardo Valera;Vladik Kreinovich;Olga Kosheleva

2016 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

Year: 2016 | Conference Paper |

Using remote sensing to promote signal and image processing

Bryan Usevitch;Scott Starks

2011 Digital Signal Processing and Signal Processing Education Meeting (DSP/SPE)

Year: 2011 | Conference Paper |

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This paper presents the development of a new elective in the Electrical and Computer Engineering program at the University of Texas at El Paso in signal and image processing using remote sensing as its central theme. Remote sensing proved to be a beneficial framework for teaching signal and image processing due to the ready availability of multispectral data sets and the number of linkages of remo...Show More

Using remote sensing to promote signal and image processing

Bryan Usevitch;Scott Starks

2011 Digital Signal Processing and Signal Processing Education Meeting (DSP/SPE)

Year: 2011 | Conference Paper |

Active learning schemes for reduced dimensionality hyperspectral classification

Vikram Jayaram;Bryan Usevitch

2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers

Year: 2009 | Conference Paper |

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Statistical schemes have certain advantages which promote their use in various pattern recognition problems. In this paper, we study the application of two statistical learning criteria for material classification of Hyperspectral remote sensing data. In most cases, the Hyperspectral data is characterized using a Gaussian mixture model (GMM). The problem in using statistical model such as the GMM ...Show More

Active learning schemes for reduced dimensionality hyperspectral classification

Vikram Jayaram;Bryan Usevitch

2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers

Year: 2009 | Conference Paper |

Two-Channel, Separable, Complex, Biorthogonal, Perfect Reconstruction Filter Banks

2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers

Year: 2007 | Conference Paper |

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This paper demonstrates the design of two-channel, separable, complex, biorthogonal perfect reconstruction filters (BPRFs), which are filters which form perfect reconstruction filter banks. Separable complex perfect reconstruction filters (PRFs) are PRFs in which the real or imaginary part is also a valid real PRF pair. Separable complex filters are designed in a two step process of first designin...Show More

Two-Channel, Separable, Complex, Biorthogonal, Perfect Reconstruction Filter Banks

2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers

Year: 2007 | Conference Paper |

Two-Channel, Separable, Complex, Orthogonal, Perfect Reconstruction Filter Banks and Wavelets

2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07

Year: 2007 | Conference Paper |

Cited by: Papers (1)

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This paper demonstrates the design of separable complex orthogonal perfect reconstruction filters (OPRFs), which are defined to be complex OPRPs in which the real or imaginary part is also a valid OPRF. Separable filters greatly simplify the task of designing complex OPRFs by reducing it to a two step process: design a real OPRF (using now well known methods), then finding a "complex complementary...Show More

Two-Channel, Separable, Complex, Orthogonal, Perfect Reconstruction Filter Banks and Wavelets

2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07

Year: 2007 | Volume: 3 | Conference Paper |

Rate distortion optimal bit allocation methods for volumetric data using JPEG 2000

O.M. Kosheleva;B.E. Usevitch;S.D. Cabrera;E. Vidal

IEEE Transactions on Image Processing

Year: 2006 | Volume: 15, Issue: 8 | Journal Article |

Cited by: Papers (8)

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Computer modeling programs that generate three-dimensional (3-D) data on fine grids are capable of generating very large amounts of information. These data sets, as well as 3-D sensor/measured data sets, are prime candidates for the application of data compression algorithms. A very flexible and powerful compression algorithm for imagery data is the newly released JPEG 2000 standard. JPEG 2000 als...Show More

Rate distortion optimal bit allocation methods for volumetric data using JPEG 2000

O.M. Kosheleva;B.E. Usevitch;S.D. Cabrera;E. Vidal

IEEE Transactions on Image Processing

Year: 2006 | Volume: 15, Issue: 8 | Journal Article |

Optimized Rate Allocation of Hyperspectral Images in Compressed Domain Under JPEG 2000 Part 2

S. Attluri;V. Jayaram;B. Usevitch

2006 IEEE Southwest Symposium on Image Analysis and Interpretation

Year: 2006 | Conference Paper |

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This paper studies the application of bit allocation using JPEG2000 for compressing multi-dimensional remote sensing data. Past experiments have shown that the Karhunen-Loeve transform (KLT) along with rate distortion optimal (RDO) bit allocation produces good compression performance. However, this model has the unavoidable disadvantage of paying a price in terms of implementation complexity. In t...Show More

Optimized Rate Allocation of Hyperspectral Images in Compressed Domain Under JPEG 2000 Part 2

S. Attluri;V. Jayaram;B. Usevitch

2006 IEEE Southwest Symposium on Image Analysis and Interpretation

Year: 2006 | Conference Paper |

A study of two-channel separable complex-valued wavelets and filter banks

M. Hernandez;B.E. Usevitch

2006 Proceeding of the Thirty-Eighth Southeastern Symposium on System Theory

Year: 2006 | Conference Paper |

Cited by: Papers (4)

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In this paper, a general method for designing orthogonal and bi-orthogonal separable complex-valued wavelets and filter banks (SCVWFB) derived from existing real-valued wavelets and filter banks (RVWFB) is proposed. With this method, complex-valued wavelets and filter banks (CVWFB) are designed from existing RVWFBs regardless of wavelet family, length, or order of regularity, and without solving h...Show More

A study of two-channel separable complex-valued wavelets and filter banks

M. Hernandez;B.E. Usevitch

2006 Proceeding of the Thirty-Eighth Southeastern Symposium on System Theory

Year: 2006 | Conference Paper |

JPEG2000 compliant lossless coding of floating point data

Data Compression Conference

Year: 2005 | Conference Paper |

Cited by: Papers (3)

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Summary form only given. Many scientific applications require that image data be stored in floating point format due to the large dynamic range of the data. These applications pose a problem if the data needs to be compressed since modern image compression standards, such as JPEG2000, are only defined to operate on fixed point or integer data. This paper proposes straightforward extensions to the ...Show More

JPEG2000 compliant lossless coding of floating point data

Data Compression Conference

Year: 2005 | Conference Paper |

Detection from hyperspectral images compressed using rate distortion and optimization techniques under JPEG2000 part 2

V. Jayaram;B.E. Usevitch;O.M. Kosheleva

3rd IEEE Signal Processing Education Workshop. 2004 IEEE 11th Digital Signal Processing Workshop, 2004.

Year: 2004 | Conference Paper |

Cited by: Papers (2)

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This paper studies the effect of different bit rate allocation strategies in JPEG2000 part 2 compression of hyperspectral data on the results of background classification. We compare the traditional bit rate allocation approach, based on the high bit rate quantizer approach, with the rate distortion optimal (RDO) approach that produces a bit rate allocation optimal in the mean squared error (MSE) ...Show More

Detection from hyperspectral images compressed using rate distortion and optimization techniques under JPEG2000 part 2

V. Jayaram;B.E. Usevitch;O.M. Kosheleva

3rd IEEE Signal Processing Education Workshop. 2004 IEEE 11th Digital Signal Processing Workshop, 2004.

Year: 2004 | Conference Paper |

Classification performance of reduced color band hyperspectral imagery from JPEG2000 decompressed data

M. Garces;B.E. Usevitch

3rd IEEE Signal Processing Education Workshop. 2004 IEEE 11th Digital Signal Processing Workshop, 2004.

Year: 2004 | Conference Paper |

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This paper presents a study of the impact of the compression of a hyperspectral image (HSI) using the JPEG2000 standard. The impact measure was the accuracy of the classification. The goal of this study is to present an approach that proposes to reduce the computational and memory costs of processing this type of data. The results presented show a savings of storage and savings in the computationa...Show More

Classification performance of reduced color band hyperspectral imagery from JPEG2000 decompressed data

M. Garces;B.E. Usevitch

3rd IEEE Signal Processing Education Workshop. 2004 IEEE 11th Digital Signal Processing Workshop, 2004.

Year: 2004 | Conference Paper |

MSE optimal bit rate allocation in the application of JPEG2000 part 2 to meteorological data

O. Koshelevat;B. Usevitch;S. Cabrera;E. Vidal

Data Compression Conference, 2004. Proceedings. DCC 2004

Year: 2004 | Conference Paper |

Cited by: Papers (3)

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The problem of optimal bit rate allocation for 3-D JPEG2000 compression is dicussed. In this paper we consider data where the 2-D slices are compressed using JPEG2000, and the third dimension is decorrelated using the Karhunen-Loeve Transform. Here two new methods are proposed. The first approach is called the Rate Distortion Optimal (RDO) method and is based on Post-Compression Rate-Distortion (P...Show More

MSE optimal bit rate allocation in the application of JPEG2000 part 2 to meteorological data

O. Koshelevat;B. Usevitch;S. Cabrera;E. Vidal

Data Compression Conference, 2004. Proceedings. DCC 2004

Year: 2004 | Conference Paper |

JPEG2000 extensions for bit plane coding of floating point data

Data Compression Conference, 2003. Proceedings. DCC 2003

Year: 2003 | Conference Paper |

Cited by: Papers (15) | Patents (4)

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Summary form only given. Modern image compression standards such as JPEG 2000 are only defined to operate on integer data and, thus, they pose a problem if data need compressing. The typical way to handle floating point data is to do an initial quantization. This approach allows standard techniques to be used on the quantized data and may be acceptable to researchers due to the irreversible data l...Show More

JPEG2000 extensions for bit plane coding of floating point data

Data Compression Conference, 2003. Proceedings. DCC 2003

Year: 2003 | Conference Paper |

A tutorial on modern lossy wavelet image compression: foundations of JPEG 2000

IEEE Signal Processing Magazine

Year: 2001 | Volume: 18, Issue: 5 | Magazine Article |

Cited by: Papers (270) | Patents (6)

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One of the purposes of this article is to give a general audience sufficient background into the details and techniques of wavelet coding to better understand the JPEG 2000 standard. The focus is on the fundamental principles of wavelet coding and not the actual standard itself. Some of the confusing design choices made in wavelet coders are explained. There are two types of filter choices: orthog...Show More

A tutorial on modern lossy wavelet image compression: foundations of JPEG 2000

IEEE Signal Processing Magazine

Year: 2001 | Volume: 18, Issue: 5 | Magazine Article |

Code selection to eliminate interchannel interference in a multi-user OFDM satellite system

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154)

Year: 2000 | Conference Paper |

Cited by: Papers (1)

Orthogonal frequency division multiplexing has been proposed as a modulation format for a multi-user satellite communications system. The main problem with this scheme is that all transmitters operate independently. Thus, prior to timing acquisition, the transmitters are not time aligned and significant interchannel interference results. This paper derives a method for transmitters to code their o...Show More

Code selection to eliminate interchannel interference in a multi-user OFDM satellite system

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154)

Year: 2000 | Volume: 1 | Conference Paper |

Optimal bit allocation for source/channel coding in joint trellis coded quantization/modulation

B. Usevitch;G. Venkatraman

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)

Year: 2000 | Conference Paper |

Shannon (1948) showed that the problems of source and channel coding could be considered separately, without loss of performance, if complexity is not an issue. Previous investigations have shown a performance gain for more practical problems where channel and source coding have been jointly designed. This paper investigates the joint source/channel coding problem when using trellis coded quantiza...Show More

Optimal bit allocation for source/channel coding in joint trellis coded quantization/modulation

B. Usevitch;G. Venkatraman

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540)

Year: 2000 | Volume: 3 | Conference Paper |

Fixed-point error analysis of two-channel perfect reconstruction filter banks with perfect alias cancellation

B.E. Usevitch;C.L. Betancourt

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing

Year: 1999 | Volume: 46, Issue: 11 | Journal Article |

Cited by: Papers (4) | Patents (2)

This paper studies the effects of fixed-point arithmetic in two-channel perfect reconstruction (PR) filter banks. Practical implementations of filter banks often require scaling of coefficients and differing binary word sizes to maintain dynamic range. When scaling is used with fixed precision arithmetic, the perfect alias cancellation (PAC) and PR constraints no longer hold. The main contribution...Show More

Fixed-point error analysis of two-channel perfect reconstruction filter banks with perfect alias cancellation

B.E. Usevitch;C.L. Betancourt

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing

Year: 1999 | Volume: 46, Issue: 11 | Journal Article |

A practical binary "bit stuffing" method for multiplierless arithmetic encoders

G.I. Sada;B. Usevitch

42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356)

Year: 1999 | Conference Paper |

Arithmetic encoding exhibits the "carry over" problem due to addition operations in its finite precision registers. An approach to solve the carry over problem is known as "bit stuffing." A practical bit stuffing detection procedure is presented. The method is simple, fast, and suitable for a hardware implementation.Show More

A practical binary "bit stuffing" method for multiplierless arithmetic encoders

G.I. Sada;B. Usevitch

42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356)

Year: 1999 | Volume: 2 | Conference Paper |

Fixed-point error analysis of two-channel perfect reconstruction filter banks with perfect alias cancellation

B. Usevitch;C. Betancourt

42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356)

Year: 1999 | Conference Paper |

This paper studies the effects of fixed-point arithmetic in two-channel perfect reconstruction filter banks. Practical implementations of filter banks often require scaling of coefficients and differing binary word sizes to maintain dynamic range. When scaling is used with fixed precision arithmetic, the perfect alias cancellation (PAC) and perfect reconstruction (PR) constraints no longer hold. T...Show More

Fixed-point error analysis of two-channel perfect reconstruction filter banks with perfect alias cancellation

B. Usevitch;C. Betancourt

42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356)

Year: 1999 | Volume: 2 | Conference Paper |

Performance Evaluation Of M-QAM Fiber-Optic Links in the Presence of the External Modulator Bias Fluctuations

M. Shadaram;A.N. Mody;B. Usevitch;D. Lafaw

International Topical Meeting on Microwave Photonics (MWP1997)

Year: 1997 | Conference Paper |

Cited by: Papers (5)

First Page of the Article

Performance Evaluation Of M-QAM Fiber-Optic Links in the Presence of the External Modulator Bias Fluctuations

M. Shadaram;A.N. Mody;B. Usevitch;D. Lafaw

International Topical Meeting on Microwave Photonics (MWP1997)

Year: 1997 | Conference Paper |

Optimal bit allocation for biorthogonal wavelet coding

Proceedings of Data Compression Conference - DCC '96

Year: 1996 | Conference Paper |

Cited by: Papers (52)

This paper shows how to derive bit allocations for biorthogonal wavelet coders which result in minimum reconstruction error. It is shown that the effect of using biorthogonal filters is to weight the amount of quantization error which appears in the reconstructed output. The amount of weighting can be determined from the biorthogonal filters used and is a measure of the closeness of the biorthogon...Show More

Optimal bit allocation for biorthogonal wavelet coding

Proceedings of Data Compression Conference - DCC '96

Year: 1996 | Conference Paper |

Adaptive filtering using filter banks

B.E. Usevitch;M.T. Orchard

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing

Year: 1996 | Volume: 43, Issue: 3 | Journal Article |

Cited by: Papers (19) | Patents (3)

This paper derives a theory for adaptive filters which operate on filter bank outputs, here called filter bank adaptive filters (FBAFs). It is shown how the FBAFs are a generalization of transform domain adaptive filters and adaptive filters based on structural subband decompositions. The minimum mean-square error performance and convergence properties of FBAFs are determined as a function of filt...Show More

Adaptive filtering using filter banks

B.E. Usevitch;M.T. Orchard

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing

Year: 1996 | Volume: 43, Issue: 3 | Journal Article |

Smooth wavelets, transform coding, and Markov-1 processes

B.E. Usevitch;M.T. Orchard

IEEE Transactions on Signal Processing

Year: 1995 | Volume: 43, Issue: 11 | Journal Article |

Cited by: Papers (20)

This paper compares the energy compacting properties of unitary transforms from transform coders and two-band paraunitary filter banks from subband coders using a cost criterion that is proposed. Stationary processes for which paraunitary filters have better energy compaction than unitary filters are denoted as subband optimal, and all subband optimal processes are analytically characterized for t...Show More

Smooth wavelets, transform coding, and Markov-1 processes

B.E. Usevitch;M.T. Orchard

IEEE Transactions on Signal Processing

Year: 1995 | Volume: 43, Issue: 11 | Journal Article |

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