Poster Session
Session Chair
Yingying (Jennifer) Chen
Stevens Institute of Technology
Castle Point on Hudson, Hoboken, NJ 07030
yingying.chen@stevens.com
BIAOGRAPHY: Dr. Chen received her Ph.D. degree in Computer Science from Rutgers University. She is
currently an assistant professor in the Department of Electrical and Computer Engineering at Stevens
Institute of Technology. Her research interests include wireless and sensor networks, security and privacy,
and distributed systems. Her research is supported by National Science Foundation (NSF) and DoD
Armament Research, Development and Engineering Center (ARDEC).
Prior to joining Stevens Institute of Technology, Dr. Chen was with Bell Laboratories and the Optical
Networking Group, Alcatel-Lucent. She also worked as a system researcher for embedded networks at
Alcatel Network Systems previously.
Dr. Chen received the IEEE Outstanding Contribution Award from IEEE New Jersey Coast Section each
year from 2000 to 2005. She is the recipient of the Best Technological Innovation Award from the 3 rd
International TinyOS Technology Exchange in 2006. She is a member of the IEEE and ACM. She has been
an executive officer for IEEE Computer and Communication Joint Chapter at New Jersey Coast Section
since 2000, and has served on the technical programs for many IEEE/ACM conferences on wireless
networking and security.
Poster Session
Performance Analysis of Slotted Aloha with
Multi-Access-Point Diversity
Di Zheng
Stevens Institute of Technology
Hoboken, NJ 07030
dzheng@stevens.edu
ABSTRACT: Slotted Aloha is an effective random access protocol and can also be an important element of
more advanced media access protocols. This paper investigates slotted Aloha in a radio environment with
multiple access points. Specifically, we examine the impact of multi-access-point (multi-AP) diversity on
the performance of slotted Aloha. The paper considers both omnidirectional (OM) and beamforming (BF)
antennas at transmission nodes. This leads to the investigation and comparison of four different network
scenarios, i.e., OM with multi-AP diversity, OM without multi-AP diversity, BF with multi-AP diversity
and BF without multi-AP diversity. Performance evaluations and comparisons are presented in terms of
throughput.
BIAOGRAPHY: Di Zheng got his B.S. and M.S. from Beijing University of Posts and
Telecommunications. Currently he is a Ph. D. student at Stevens Institute of Technology. His research
interest is wireless communications.
Poster Session
Neighbor Observation Mechanism for Location
Verification in Wireless Sensor Networks
Jie Yang, Xiuyuan Zheng, and Yingying Chen
Dept. of Electrical and Computer Engineering
Stevens Institute of Technology, Hoboken, NJ 07030
{jyang, xzheng1, yingying.chen}@stevens.edu
ABSTRACT: The location information of wireless nodes plays an important role in many location-aware
applications in wireless sensor networks, such as monitoring the status of soldiers, tracking the equipments
and robotic navigation. There have been a plethora of schemes developed to localize sensor nodes recently.
However, the performance of the localization algorithms degrades significantly when the sensors are
deployed in hostile environments or are attacked by adversaries. In this work, we propose a decentralized
neighbor observation approach for location verification in wireless sensor networks. Particularly, we
developed three location verification schemes, which employ the collaboration of neighbor nodes and don’t
need network deployment knowledge or a central verification center. To validate our proposed verification
schemes, we conducted extensive simulation experiments. Our simulation results show that the proposed
location verification schemes are not only effective in detecting abnormal locations caused by adversaries,
but also robust when a high percentage of sensor nodes are compromised.
BIAOGRAPHY:
Jie Yang is a Ph.D. candidate of the Electrical and Computer Engineering Department at Stevens Institute
of Technology. His research interests include information security & privacy, wireless localization and
location based services (LBS), wireless and sensor networks. He is currently working in the Data Analysis
and Information SecuritY (DAISY) Lab with Prof. Yingying Chen. He was in the Ph.D. program in
Department of Automatic Control of Beijing Institute of Technology from 2005 to 2007. He received
his Bachelor’s degree from Department of Automatic Control at Beijing Institute of Technology, China,
in 2004.
Xiuyuan Zheng is currently a Ph.D. student of the Electrical and Computer Engineering Department at
Stevens Institute of Technology. His research interests include information security & privacy, wireless
localization and location based services (LBS), wireless and sensor networks. He is currently working in
the Data Analysis and Information SecuritY (DAISY) Lab with Prof. Yingying Chen. He was in the Master
program in the Electrical and Computer Engineering Department at Stevens Institute of Technology from
2007 to 2009. He received his Bachelor’s degree from Department of Telecommunication Engineering at
Nanjing University of Posts and Communications, China, in 2007.
Poster Session
Protocol Design Issues in WLAN
Muhammad Akber Farooqui
Atlas bank Limited
28,F-11 Markaz Islamabad Pakistan
akbar.farooqui@atlasbank.com.pk
ABSTRACT: IEEE 802.11 wireless LAN (WLAN) is the most widely used WLAN standard today, but it
cannot provide QoS support for the increasing number of multimedia applications. Thus, a large number of
802.11 QoS enhancement schemes have been proposed, each one is focusing on a particular mode. This
work summarizes all these schemes and presents current research activities. First, we analyze the QoS
limitations of IEEE 802.11 wireless MAC layers. Then, different QoS enhancement techniques proposed
for 802.11 WLAN are described and classified along with their advantages/drawbacks. Finally, the
upcoming IEEE 802.11e QoS enhancement standard is introduced and studied in detail. We are proposing
in this work to adapt the concept of Quality of Service (QoS) issues in wireless LAN scenario. A deep
comparative analysis has been done with leader based schemes and results have been verified using
OPNET simulator.
BIAOGRAPHY: Mr. Muhammad Akber Farooqui had done his Bachelors of Science in Electronic
Engineering (B.E) from Sir Syed University Of Engineering & Technology (S.S.U.E.T) Karachi-Pakistan,
he also done his M.S. from Karachi Institute of Economics and Technology Karachi-Pakistan.
He joined Winson Technologies (Pvt), Ltd
as a
2002, he then joined Compunet Online (Pvt), Ltd
Trainee Engineer – Operations Department in August
as a Assistant Engineer – Online Technical Support,
Network Operations Center in Jan 2003, then he joined Multinet Broadband (Pvt.) Ltd as a
Project
Engineer (WLL) – Broadband Wireless Network in Oct 2003, then he joined Premier Systems (Pvt.) Ltd as
a System Support Engineer –Wireless Communication in
Sept 2006, currently he is working for Atlas
Bank Ltd as a Network Engineer –I.T Department since Aug 2008.
Poster Session
Efficient and Fault-Tolerant Detection of Attacks in RFID
Asset Tracking Systems
Jiawei Sun*, Bernhard Firner*, and Danfeng Yao+,
*
WINLAB, Rutgers University, New Brunswick, NJ
{jiavsun,
bfirner,
yyzhang}@eden.rutgers.edu
Yanyong Zhang*
+
Dept. of Computer Science, Rutgers University, New Brunswick, NJ
danfeng@cs.rutgers.edu
ABSTRACT: When used for asset tracking, RFID significantly reduces labor costs and improves
management efficiency. However, virtually all existing secure RFID solutions use cryptographic
operations, which are power-consuming to execute on small RFID tags, and are expensive to deploy in
practice. There has not been a systematic study on the attacks, detection, and preventions in crypto-free
RFID systems, where conventional cryptographic tools are not available.
In this work, we aim to design efficient and accurate detection algorithms that identify attacks in RFID
asset tracking systems, in particular, the theft attacks. Our main approach is to monitor, compare, and
analyze wireless signals received at multiple base stations and to estimate static positions and dynamic
trajectory of tags. We define several advanced attack models, including swapping attacks and social
engineering attacks. We develop a robust theft-prevent module that strategically assigns witnesses for tags.
The witness nodes serve as baselines in detecting abnormal radio signals. We deploy wireless tags and base
stations in our wireless network testbed that is used to collect data, simulate attacks, and evaluate detection
accuracy. Future work includes further experiments to evaluate the effectiveness and robustness of the
detection algorithms under various attack scenarios.
BIAOGRAPHY:
Jiawei Sun is a PhD student of the Electrical and Computer Engineering Department at Rutgers University.
His research interests include network security, wireless Ad-hoc and sensor networks. He is currently
researching wireless sensor network security at the Wireless Information Network Laboratory (WINLAB).
He received his Bachelors degree from Shanghai Jiao Tong University, China, in 2008.
Bernhard Firner is a PhD student of the Electrical and Computer Engineering Department at Rutgers
University. He is currently researching low power sensor networks and sensor network security at the
Wireless Information Network Laboratory (WINLAB). He received his Bachelors and Masters degrees
from Stevens Institute of Technology and worked in industry for an avionics company prior to enrolling in
the PhD program.
Danfeng Yao is an assistant professor in the Department of Computer Science at Rutgers University, New
Brunswick. She received her Computer Science Ph.D. degree from Brown University. Her research
interests are in information security and applied cryptography. Danfeng has more than 25 publications on
security and applied cryptography. She won the Best Student Paper Award in ICICS 2006, and the Award
for Technological Innovation from Brown in 2006.
Yanyong Zhang received her Ph.D. degree in computer science and engineering from Pennsylvania State
University in 2002. She is an associate professor in the Department of Electrical and Computer
Engineering, Rutgers University, and she is also a faculty member at Wireless Information Network
Laboratory (WINLAB). Her current research interests include sensor networks, sensor network security
and privacy, and fault-tolerant sensor networks. She has received several US National Science Foundation
(NSF) grants on these topics, including an NSF Faculty Early Career Development (CAREER) Award. She
has published over 50 papers in journals and conferences. She is a member of the ACM, the IEEE, and the
IEEE Computer Society.
Poster Session
Receiver-Cooperation: Network
Coding and Distributed Scheduling
Phisan Kaewprapha, Nattakan Puttarak and
Jing Li (Tiffany)
Department of Electrical and Computer
Engineering
Lehigh University, Bethlehem, PA 18015
{ phk205, nap205}@lehigh.edu,
jingli@ece.lehigh.edu
ABSTRACT: We study network-coded receiver cooperation for a wireless system comprising a remote sender
and a set of local receivers. Network codes based on GF(2^q) random-mixing are complex and prone to errors.
Sparse binary random-mixing is considerably simpler, but for it to be space-preserving requires the
involvement of a huge number of source packets (vectors). We propose a novel strategy of offset sparse binary
random-mixing (OSBram), in which the source vectors are firstly circularly shifted, each by a different
random offset, before being XORed. This simple strategy cleverly compensates the low degree of the binary
field by the large dimension of the vector space, ensure (near) linear-independence of random binary
superpositions, and finds solid structural support from the well-known class of quasi-cyclic low-density
parity-check codes. A second innovation is the introduction of scheduling in user cooperation. We show that
this previously ignored factor can be critical to cooperative gains. An elegant distributed scheduler is proposed
that allows distributed nodes to quickly reach a rational consensus without the need to exchange any side
information.
BIOGRAPHIES:
Nattakan Puttarak: She received the B.S. degree in electronics and telecommunications engineering from
King Mongkut’s University of Technology Thonburi, Bangkok, Thailand in 2002, and the master’s degree in
electrical engineering from Lehigh University in 2007. Now, she further pursues the Ph.D. degree in electrical
engineering in Lehigh University.
She granted a full scholarship from Thai government to achieve the Ph.D.
degree. Her research interests include channel coding, information theory, and their applications to
communication systems.
Phisan Kaewprapha: He received the B.S. degree in computer engineering from Chiang Mai University,
Chiang Mai, Thailand in 2001, and the master’s degree in electrical engineering from Lehigh University in
2007. Now, he is a Ph.D. student in electrical engineering, Lehigh University.
He was granted a scholarship
from Thai government for the graduate program. His research interests include channel coding, information
theory, network information flows.
Jing Li (Tiffany): She received the B.S. degree in computer science from Peking University (Beijing
University), Beijing, China, the master’s and Ph.D. degree in electrical engineering from Texas A&M
University, College Station, in 1997, 1999, and 2002, respectively. Right after obtaining her Ph.D. degree, she
joined the Electrical and Computer Engineering Department at Lehigh University where she is now an
associate professor. Her research interests fall in the general areas of coding and communication theory,
wireless communications and networks, free-space optical and fiber optical communications, and digital data
storage systems. Her recent reserach focuses include turbo/LDPC/TPC codes and iterative decoding, MDS
erasure codes and digital fountain, quantum error correction coding and quantum communication, distributed
source coding and joint source-channel coding, user cooperation and network coding, wireless ad-hoc and
sensory networks, and distributed network storage. Dr. Li is an associate editor for IEEE Communications
Letters. She served as a Symposium Co-Chair for the Signal Processing Symposium in 2005 IEEE Global
Communications Conference (GLOBECOM), the Signal Processing for Communications Symposium in 2005
IEEE WirelessCom, the Signal Processing and Communication Theory Symposium in 2006 Chinacom, and the
Communication Theory Symposium in 2007 International Conference on Communications (ICC).
Poster Session
Traffic Light Network Queue Analysis in One
Direction
Ellen Shlossberg and Shilpa Srinivasan
Columbia University
1300 S.W. Mudd, 500 West 120th St., New York, NY 10027
{es2811, ss3502}@columbia.edu
ABSTRACT: In an urban city environment, a green wave process is used to regulate traffic lights, often
causing traffic congestion throughout the day due to inefficient light changes. However, traffic flow can be
facilitated through a distributed wireless network of traffic lights. This poster displays the application of
queuing theory to one traffic light in a single direction. By plotting arrival and departure rates on a single
graph, taking the area between the two curves, and dividing by the total red-green cycle time, the average
number of cars waiting at a traffic light can be estimated. We present a simulation of one intersection,
comparing a linear and random arrival process in one cycle, followed by a random arrival process over
multiple cycles. Car queue length is then evaluated by varying several parameters such as car arrival and
departure rates along with the light’s cycle time.
BIOGRAPHY: Ellen Shlossberg is currently working on her MS in Electrical Engineering at Columbia
University and holds a BS in Electrical Engineering from Tufts University with a minor in Biomedical
Engineering. Ellen also joined Raytheon Company in 2005 as a Systems Engineer, in the Integrated Defense
Systems business unit. At Raytheon, Ellen was involved in a variety of projects including PATRIOT system
test and analysis, focusing on surveillance validation and test conduct, and SLAMRAAM system test planning
along with Fire Unit, Sensor, and Integrated Fire Control Station performance analysis. She also led the
system integration and test effort and demo conduct for the IDS JFires Campaign, and pioneered the
SLAMRAAM-PATRIOT Link 16 connectivity test efforts. Ellen has been recognized for her demo-specific
work in sensor networking on the JFires program, and for her system analysis contributions in PATRIOT and
SLAMRAAM. She also holds a Raytheon Author’s award and received the Raytheon Advanced Program
Scholarship in 2008 to pursue her MS degree. Ellen’s primary interests are in communications and
networking, with a focus in sensor networks. Her other hobbies include sailing and world travel, having
recently been to the Ecuadorian jungle and previously traipsing through the Kalahari desert on a safari trip to
Southern Africa.
Shilpa Srinivasan got her B.S. degree in electrical engineering from Boston University in 2004. After
graduating cum laude, she joined Sensis Corporation, a radar engineering company in Syracuse, NY. As a lead
systems engineer, Ms. Srinivasan was involved in many international programs in Europe and Asia. Her focus
was designing, integrating and testing sensor networks for air traffic surveillance and safety at commercial
airports. After four years as a lead systems engineer, she decided to pursue a M.S. at Columbia University.
Ms. Srinivasan is currently a graduate student studying electrical engineering at Columbia University. Her
focus is on wireless and mobile communications.
Poster Session
Cooperative Spectrum Sharing in Cognitive
Radio Networks
Tariq Elkourdi and Osvaldo Simeone
Center for Wireless Communications and Signal Processing
Research, New Jersey Institute of Technology
University Heights, Newark, NJ 07102
{ the3, osvaldo.simeone}@njit.edu
ABSTRACT: The need to accommodate fast-emerging wireless communication services has motivated
academia and industry to look for a solution to the problem of available spectrum scarcity. Cognitive radio
has the potentiality to overcome the spectral shortage by enabling secondary (unlicensed) users to utilize
spectrum holes left open by the primary inactivity. In this research, the impact of secondary MAC
cooperation on the sum-throughput of multichannel cognitive radio networks is studied. The main goal is
twofold: Given the primary and secondary users' duty cycle,
(i)
investigate the amount of spectrum sharing (i.e., number of secondary users) that maximizes the
sum- throughput in the presence of secondary MAC cooperation;
(ii)
assess the performance gains attainable with cooperation.
First, analysis is provided for the idealistic case of perfect sensing, with a simple model for secondary
cooperation. Then, for the more realistic case of imperfect sensing, novel cooperative secondary strategies
are proposed that are shown to provide relevant performance gains in terms of sum-throughput. Finally,
numerical simulation results are provided to evaluate the performance of the cooperative schemes relative
to other non-cooperative schemes.
BIAOGRAPHY: Tariq Elkourdi received the M.Sc. degree in Telecommunications Engineering from
New Jersey Institute of Technology, Newark, NJ, in 2008, and the B.Sc. in Communications and
Electronics Engineering from Applied Science University, Amman, Jordan, in 2006. He is currently
pursuing the Ph.D. degree in the Center for Wireless Communications and Signal Processing Research
(CWCSPR) at NJIT. His current research interests include Cognitive Radio and Cooperative
Communications.
Dr. Osvaldo Simeone received the M.Sc. degree (with honors) and the Ph.D. degree in Information
Engineering from Politecnico di Milano, Milan, Italy, in 2001 and 2005 respectively. He is currently with
the Center for Wireless Communications and Signal Processing Research (CWCSPR), at the New Jersey
Institute of Technology (NJIT), Newark, New Jersey, where he is an Assistant Professor. His current
research interests concern the crosslayer analysis and design of wireless networks with emphasis on
information-theoretic, signal processing and queuing aspects. Specific topics of interest are: cognitive
radio, cooperative communications, ad hoc, sensor, mesh and hybrid networks, distributed estimation and
synchronization. Dr. Osvaldo Simeone currently serves as an Editor for IEEE Transactions on Wireless
Communications.
Poster Session
Addressable Carbon Nanotube Intra-connects With
Conductive Polymer
Seon Woo Lee
New Jersey Institute of Technology
University Height, Newark, NJ 07981
seon.w.lee@gmail.com
ABSTRACT: We have measured the electrical and optical properties carbon nanotube (CNT) based
addressable intra-connects which were deposited with conductive polymer, polycarbazole (PCZ).
Individual, single-walled CNT (SWCNT) channel was grown by chemical vapor deposition (CVD)
precisely between very sharp metal tips on pre-fabricated circuit without post-process. Polycarbazole (PCZ)
was deposited on top of the as-grown individual SWCNT bridge using electrochemical deposition in a
three-electrode cell configuration. The quality and type of the SWCNT was assessed by the radial breathing
mode of the CNT intra-connect. Electrical properties such as Ids-Vds and Ids-Vgs characteristics were
measured in darkness and under white light illumination. The channel conductance increased as a function
of white light irradiation. Both the CNT only and PCZ channels were sensitive to the white light exposure,
exhibiting approximately 10% conductance increase at intensity values of 0.25W/cm 2. Yet, the CNT/PCZ
channel exhibited a photo-conductance change of 400% by the same white light intensity.
BIAOGRAPHY:
Ms. Lee got her M.S. from New Jersey Institute of Technology and she is currently a Ph.D. student at New
Jersey Institute of Technology. Her area of expertise is nanoscience. The field is highly interdisciplinary,
requiring knowledge of physics, chemistry, materials science, device physics and electrical engineering.
Main research focuses on the development of nano-devices for electro-optics and sensing purposes: these
are based on individual carbon nanotubes (CNT) and CNT composites with conductive polymers (CP). She
received First Prize of Fourth Annual Provost’s Student Research Showcase from NJIT in 2008 and
received Outstanding Research Poster Award, First Prize of WOCC (Wireless and Optical Communications
Conference) in 2007.
Poster Session
Anti Fading High Accuracy Localization Algorithm
using Distributed Space-time Block Codes
Xingkai Bao
Lehigh University
19 Memorial Dr, ECE department, Bethlehem, PA 18015
xib3@ece.lehigh.edu
ABSTRACT: In wireless sensor networks, localization in indoor environment suffers from multi-path
fading and non-LOS (line-of-sight) conditions. In this paper, a new localization algorithm is proposed,
which makes use of distributed space-time-codes to combat the multi-path fading. The proposed algorithm
converts the localization problem to the synchronization issue in distributed space-time-codes. It not only
inherits the merits of traditional TDOA (time-difference-of-arrival) techniques, but also reduces the total
transmission times greatly. The maximum likelihood algorithm to estimate the TDOA is derived.
Simulation results show that the new algorithm can significantly improve the localization accuracy under
different conditions.
BIAOGRAPHY:
Xingkai Bao was born in China, 1978. He received the Bachelor's degree and Master's degree in electrical
engineering from Southeast university, Nanjing, China, in 2000 and 2003, respectively. He entered Lehigh
university, PA, USA as a phd student from the spring, 2004. His research interests fall in the general areas
of coding and communication theory, wireless communications and networks. His recent research focuses
include positioning localization, user cooperation, relay networks, rateless LDPC codes and network coding
in wireless ad-hoc and sensory networks. Bao worked as a lecturer in the radio engineering department of
southeast university from 2003 to 2004. Currently, he is a research assistant in the electrical and computer
engineering department of Lehigh university, PA. He worked in Philips Research, Braircliff Manor, NY
from 2007 to 2008. He has published several articles and has presented his research at numerous
conferences and workshops.
Poster Session
Energy-efficient and Thermal Comfort-based HVAC
System Control
Wenqi (Wendy) Guo and Mengchu Zhou
Dept. of Electrical and Computer Engineering,
New Jersey Institute of Technology, Newark, NJ
{wg9, zhou}@njit.edu
ABSTRACT: Heating ventilating and air-conditioning (HVAC) systems are commonly applied in modern
commercial buildings to maintain a reasonable level of thermal comfort. The research conducted in the last
decade suggests that HVAC systems greatly affect the thermal comfort, health, satisfaction, and work
performance of the building occupants since it provides buildings with heating/cooling functions and
filtered outdoor air. Outdoor air may need to be heated or cooled before it is distributed into the occupied
space depending on different building environmental conditions. HVAC and its associated control systems
play a huge part in a building’s overall energy consumption. Reports from US Department of Energy
indicate that HVAC accounts for 40 to 60% of the energy consumed in US commercial and residential
buildings. The current research suggests that energy efficiency can be improved roughly by 20-40% if
better control strategies are applied. Well-designed efficient HVAC systems can achieve this objective with
minimal non-renewable energy and air/liquid pollutant emissions.
This research investigates the thermal comfort-based HVAC system control strategies for modern
commercial buildings, and explains the relationships between achieving occupant comfort and decreasing
energy consumption of HVAC systems. Better control algorithms and emerging technologies such as
wireless sensor networks are required to make them energy-efficient as well as provide comfortable
environment to assure occupants’ productivity.
BIAOGRAPHY:
Wenqi Guo is a Ph.D. candidate at Department of Electrical and Computer Engineering, New Jersey
Institute of Technology, Newark, NJ, where she joined in January 2006. She has been doing research in the
areas of Wireless Sensor Networks, Wireless Mesh Networks, Petri Nets, Intelligent Building Systems and
Building Automation Control Systems.
She received the B.S degree from Beijing University of Civil
Engineering and Architecture, Beijing, China in 2001 and the Master degree from New Jersey Institute of
Technology in 2006. She is a student member of IEEE.
MengChu Zhou is currently a Professor of Electrical and Computer Engineering and the Director of
Discrete-Event Systems Laboratory at New Jersey Institute of Technology (NJIT).
He is also Director of
the MS Program in Computer Engineering and Director of the MS Program in Power and Energy Systems
at NJIT. His research interests are in Petri nets, computer-integrated systems, wireless ad hoc and sensor
networks, system security, semiconductor manufacturing, life-cycle engineering product design, and
embedded control.
book-chapters.
He has over 300 publications including 7 books, 130+ journal papers, and 17
He is currently Editor of IEEE Transactions on Automation Science and Engineering, and
Associate Editor of IEEE Transactions on Systems, Man and Cybernetics: Part A and IEEE Transactions
on Industrial Informatics.
He is a life member of Chinese Association for Science and Technology-USA
and served as its President in 1999.
He served as Chair of Board of Trustees, WOCC (Wireless and
Optical Communication Conference) Inc. in 2006-2007. He is Fellow of IEEE.
Poster Session
I/Q Imbalance Mitigation for Time-Reversal STBC
Systems Over Frequency-Selective Fading Channels
Mingzheng Cao and Hongya Ge
CWCSPR, Dept of ECE, NJIT, Newark, NJ
{mc229, ge}@njit.edu
ABSTRACT: Space-time block coded (STBC) communication systems provide reliable data transmissions
by exploiting the spatial diversity in frequency-flat fading channels. To further exploit the multi-path
diversity embedded in the frequency-selective fading channels, time-reversal (TR) STBC system have been
proposed and studied extensively. In practical implementations, the in-phase/quadrature (I/Q) imbalance
(the non-ideal matching between the relative amplitudes and phases of the I and Q branches of a
transceiver) exists in many RF systems due to analogue imperfections. This commonly results in a small
complex conjugate term in the time domain, hence an equivalent mirror-image distortion term in frequency
domain in the data structure of communication systems. Therefore, I/Q imbalance increases symbol error
rate (SER) drastically, especially in STBC systems utilizing both symbols and their complex-conjugates.
In this work, we develop a new transmission scheme that enables simple yet effective solutions, both in the
time domain and in the frequency domain, to mitigate transceiver I/Q imbalance for TR-OSTBC systems
operating over frequency-selective fading channels. The proposed method can mitigate the transceiver I/Q
imbalance at the receiver with only the estimated effective channel state information (ECSI). It combines
the tasks of estimating the transmitter I/Q imbalance parameters, the channel and receiver I/Q imbalance.
Simulation results demonstrate that the transceiver I/Q imbalance can be effectively compensated by
employing the proposed solutions with either known or estimated ECSI.
BIOGRAPHY:
Mingzheng Cao is a PhD student in the Department of the Electrical and Computer Engineering at New
Jersey Institute of Technology. His research interests focus on signal processing and wireless
communications, especially, distortion mitigation in MIMO STBC systems, interference avoidance and
cancellation, and adaptive filter design. He is currently doing research in RF impairment mitigation,
especially I/Q imbalance mitigation in STBC wireless communication systems at the Center for Wireless
Communications and Signal Processing Research (CWCSPR). He received his Bachelors degree from
Tianjin University, China, and his Master degree from the National University of Singapore, Singapore.
Hongya Ge received the B.S. degree from the University of Electronic Science and Technology of China
(UESTC), Chengdu, China; the M.S. degree from the Nanjing University of Aeronautics and Astronautics,
Nanjing, China; and the Ph.D. degree from the University of Rhode Island, Kingston, RI, in 1982, 1985,
and 1994, respectively, all in electrical engineering. Since 1995, she has been with the Department of
Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, where she is
currently an associate professor. Her research interests are in the general areas of statistical signal and array
processing, transceiver design for wireless communications, and reduced rank adaptive subspace methods
for detection, estimation, synchronization, tracking, adaptive beamforming and interference suppression.
Over the years, her research has been sponsored by the Physical Optics Corporation, Texas Instruments, US
Army CECOM, NJCST, NSF, ONR-NUWC, and other high-tech firms in CA and NJ. Dr. Ge has
published 100+ technical papers in Journals and International Conference Proceedings. She has served as a
member of the IEEE Technical Committee on Sensor Array and Multichannel (SAM) Signal Processing,
the Editorial Board of the EURASIP Journal on Wireless Communications and Networking, and the
Editorial Board of the IEEE Transactions on Signal Processing.
Poster Session
A New Compact Multichannel Receiver for
Underwater Wireless Communication
Networks
Ali Abdi and Huaihai Guo
Center for Wireless Communication and Signal
Processing Research, NJIT
Newark, NJ, 07102, USA
ali.abdi@njit.edu, hg45@njit.edu
ABSTRACT:
A vector sensor is capable of measuring important non-scalar components of the acoustic
field such as the particle velocity, which cannot be obtained by a single scalar pressure sensor. On the other
hand, underwater acoustic communication systems have been relying on scalar sensors only, which
measure the pressure of the acoustic field. The novel idea of this work is to take advantage of the vector
components of the acoustic field, such as the particle velocity, sensed by a vector sensor at the receiver, for
detecting the transmitted data.
In this work we have introduced and developed the concept of data detection and equalization in
underwater communication channels using acoustic vector sensors. These sensors measure the acoustic
pressure, as well as the components of the acoustic particle velocity. Basic system equations for such a
receiver are derived and channel equalization using these sensors is formulated. Signal and noise power
characteristics in such sensors are also investigated. Via extensive simulations under different propagation
scenarios, the performance of a vector sensor equalizer is determined and compared with single and
multiple pressure sensor receivers. The impact of channel estimation error on the receiver performance is
also studied. The delay spreads of velocity channels are also investigated.
BIAOGRAPHY:
Ali Abdi received the Ph.D. degree in electrical engineering from the University of Minnesota,
Minneapolis, in 2001. He joined the Department of Electrical and Computer Engineering of New Jersey
Institute of Technology (NJIT), Newark, in 2001, where he is currently an Associate Professor. His current
research interests include characterization and estimation of wireless channels, digital communication in
underwater and terrestrial channels, blind modulation recognition, systems biology and molecular
networks. Dr. Abdi was an Associate Editor for IEEE Transactions on Vehicular Technology from 2002 to
2007. He was also the co-chair of the Communication and Information Theory Track of the 2008 IEEE
ICCCN (International Conference on Computer Communications and Networks). Dr. Abdi has received
2006 NJIT Excellence in Teaching Award, in the category of Excellence in Team, Interdepartmental,
Multidisciplinary, or Non-Traditional Teaching. He has also received 2008 New Jersey Inventors Hall of
Fame (NJIHoF) Innovators Award on Acoustic Communication, for his work on underwater acoustic
communication.
Huaihai Guo received the master degree in electrical engineering from Cleveland State University. Now
he is the Ph.D. candidate in Electrical and Computer Engineering of New Jersey Institute of Technology
(NJIT).
His current research interests include digital communication in underwater channels via vector
sensors, precoding/equalization for acoustic particle velocity channels and multiuser and multiple access
system via vector sensors. He is a Student Member of IEEE.
Poster Session
Full Rate Space Time Codes for Large Number of
Transmitting Antennas, with Liner Complexity
Decoder and High Performance
Amir Laufer , Yeheskel Bar-Ness
Center Wireless Communication and Signal Processing
Research, NJIT, Newark, NJ
amir.laufer@gmail.com , barness@yegal.njit.edu
ABSTRACT: Space time codes (STC) have been shown to be used well with the Multiple Input Multiple
Output (MIMO) channel. The Orthogonal STC (OSTC) family of codes is known to achieve full diversity
as well as very simple implementation of the Maximum Likelihood (ML) decoder. However, it was proven
that with a complex symbol constellation one cannot achieve a full rate code when the number of
transmitting antennas is larger than 2. In order to tackle this inherent rate loss of the OSTC we suggest what
we term the "row elimination" method. With this transmission method only part of the code word is
transmitted. By eliminating one or more rows (which corresponds to the time in the space-time code
structure) the rate is increasing. Obviously, the remaining code word is not orthogonal anymore hence
requires complex ML decoder realization. Therefore, another sub-optimal decoding scheme is adopted such
as the Zero Forcing (ZF) decoder. Since the ZF decoder involves the inversion of the channel matrix the
computational complexity is still relatively high. To that end we propose a new decoding scheme which
contains two steps - at the first step the non-transmitted part is estimated at the receiver while at the second
step the transmitted symbols are retrieved based on the received and the estimated data. It can be shown
that this scheme is equal to the ZF decoder but with less computational overhead. Moreover, we found a
method to generate new OSTC for which, applying the suggested transmission and decoding schemes,
results in a full rate and linear complexity for the ZF decoder for any number of transmit antennas. It can be
shown that when the transmitter knows the strongest channel (through minimal feedback) the performance
of the suggested schemes is better than the one achieved by the use of OSTC or even Quasi-OSTC (QSTC)
codes with the same rate and power budget.
BIAOGRAPHY:
Amir Laufer is a Ph. D. student in Electrical Engineering at the Center of Wireless Communication and Signal
Processing Research (CWCSPR) at New Jersey Institute of Technology (NJIT) with the guidance of Prof. Bar-Ness.
His research interests are Space Time Coding (STC), Hybrid Network and Modulation Classification. He received his
B.S.
(05) and M.S (06) both in Electrical Engineering from Tel Aviv University, Israel. His Master Thesis topic was
“Game theoretic aspects of distributed spectrum cooperation for DSL networks” and dealt with a form of the
“Prisoner’s Dilemma” that can be formed when a common resource of a system is handled without any regulations.
Yeheskel Bar-Ness holds B.Sc and M.Sc degrees in Electrical Engineering from the Technion, Israel, and a Ph.D.
degree in Applied Mathematics from Brown University, Providence, RI. He is a Distinguished Professor of ECE,
Foundation Chair of Communication and Signal Processing Research and Executive Director of the Center for Wireless
Communication and Signal Processing Research (CCSPR) at the New Jersey Institute of Technology, Newark. After
working in the private sector, he joined the School of Engineering, Tel-Aviv University in 1973. He came to NJIT from
AT&T Bell Laboratories in 1985. Current research interests include design of MIMO-OFDM, and MC-CDMA,
adaptive array and spatial interference cancellation and signal separation for multi-user communications, and
modulation classification. Recently, he is contributing in the area of cooperative communication, modulation
classification, cognitive radio, link adaptation with cooperative diversity, cross layer design and analysis and
scheduling and beam-forming for downlink with limited feedback. He published numerous papers in these areas. He
serves on the editorial board of WIRED MAGAZINE, was the founding Editor-in-chief of IEEE COMMUNICATION
LETTERS, and was associate and area editor for IEEE TRANSACTIONSON COMMUNICATIONS. He is currently
on the editorial board of the JOURNAL OF COMMUNICATION NETWORKS. He has been the technical chair of
several major conferences and symposiums and was the recipient of the Kaplan Prize (1973), which is awarded
annually by the government of Israel to the ten best technical contributors. He is a Fellow if IEEE and is the recipient
of the IEEE Communication Society’s “Exemplary Service Award,” and was selected the “NJ 2006 Inventor of the
Year,” recognized for ”systems and methods to enhance wireless/mobile communications”.
Poster Session
Throughput of Two-Hop Wireless
Networks with Relay Cooperation
Bo Niu, Osvaldo Simeone, and Alexander M.
Haimovich
CWCSPR, NJIT, Newark, NJ
{bo.niu, osvaldo.simeone, haimovic}@njit.edu
ABSTRACT: In this work, we consider the throughput problem of a wireless fading network with two-hop
relaying, where n single antenna source-destination pairs communicate through a set of single antenna
relays using amplify-and-forward strategy. Two different cooperation schemes at the relay nodes are
considered, where the relays share either channel state information (CSI) or both CSI and received signals.
The high level of cooperation is justified for a case where the relaying role is fulfilled by infrastructure
nodes that can communicate through a wired backbone without an overhead on the wireless channel. We
show that in the first case, at least n2 relays are needed to achieve linear scaling of the system throughput
versus n. In the second case, exchanging the received signals at the relays can reduce the needed number of
relays to n in order to achieve linear scaling. It is also shown that the second cooperation scheme achieves a
strictly positive per node throughput, where the total number of nodes accounted for includes the relays.
BIAOGRAPHY:
Bo Niu is a PhD candidate of the Electrical and Computer Engineering Department at New Jersey Institute
of Technology. His current research is focused on cooperative communications, relay network, interference
management, multiuser scheduling, limited feedback communication and MIMO. Both for theoretical
analysis and practical system design. In Summer 2008, he worked as an intern system engineer in the CTO
Office, InterDigital Communications. His work was related to the design and investigation of relay assisted
cooperative schemes for LTE, LTE-Advanced systems. He received the B.S and M.S. degrees, in 2000 and
2003 respectively, from Xidian University, China.
Osvaldo Simeone received his Ph.D. degree in information engineering from Politecnico diMilano, Milan,
Italy, in 2005. He is currently with the Center for Wireless Communications and Signal Processing
Research, New Jersey Institute of Technology, Newark, New Jersey, where he is an assistant professor. His
current research interests concern the cross-layer analysis and design of wireless networks with emphasis
on information-theoretic, signal processing and queuing aspects. He is an editor for IEEE Transactions on
Wireless Communication.
Alexander M. Haimovich (haimovic@njit.edu) is a professor of electrical and computer engineering at the
New Jersey Institute of Technology. He recently served as the Director of the New Jersey Center for
Wireless Telecommunications, a state funded consortium including NJIT, Princeton University, Rutgers
University, and Stevens Institute of Technology. He has been at NJIT since 1992. Prior to that, he served as
Chief Scientist of JJM Systems from 1990 until 1992. From 1983–1990 he worked in a variety of
capacities, up to senior staff consultant, for AEL Industries, Lansdale, Pennsylvania. He received the Ph.D.
degree in systems from the University of Pennsylvania in 1989, the M.Sc. degree in electrical engineering
from Drexel University in 1983, and B.Sc. degree in electrical engineering from the Technion, Haifa, Israel
in 1977. His research interests include MIMO systems, wireless networks, array processing for wireless
communication, and radar. He is a Senior Member of the IEEE.
Poster Session
Secure Multidimensional Range Queries
in Sensor Networks
Rui Zhang, Jing Shi, Yanchao Zhang
Dept. of Electrical and Computer Engineering,
New Jersey Institute of Technology, Newark, NJ,USA
{rz23, js39, yczhang}@njit.edu
ABSTRACT: Most future large-scale sensor networks are expected to follow a two-tier architecture which
consists of resource-rich master nodes at the upper tier and resource-poor sensor nodes at the lower tier.
Sensor nodes submit data to nearby master nodes which then answer the queries from the network owner
on behalf of sensor nodes. Relying on master nodes for data storage and query processing raises severe
concerns about data confidentiality and query-result correctness when the sensor network is deployed in
hostile environments. In particular, a compromised master node may leak hosted sensitive data to the
adversary; it may also return juggled or incomplete query results to the network owner. This paper, for the
first time in the literature, presents a suite of novel schemes to secure multidimensional range queries in
tiered sensor networks. The proposed schemes can ensure data confidentiality against master nodes and
also enable the network owner to verify with very high probability the authenticity and completeness of any
query result by inspecting the spatial and temporal relationships among the returned data. Detailed
performance evaluations confirm the high efficacy and efficiency of the proposed schemes.
BIAOGRAPHY:
Rui Zhang is a PhD candidate of the Electrical and Computer Engineering Department at New Jersey
Institute of Technology. His research interests include network and distributed system security, wireless
networking, and mobile computing. He received the B.E. degree in Communication Engineering the M.E.
degree in Communication and Information System from Huazhong University of Science and Technology,
China, in 2001 and 2005, respectively. Before he joined NJIT in 2008, he had been working as a software
engineer in UTStarcom Shenzhen R&D center for three years.
Jing Shi is a Ph.D. candidate in Department of Electrical and Computer Engineering at New Jersey
Institute of Technology. Her research interests are in network and distributed system security, wireless
networking, and mobile computing. She received the Bachelors and Masters degrees from Huazhong
University of Science and Technology, China, in 2003 and 2006, respectively.
Yanchao Zhang received his B.E. in Computer Communications from Nanjing University of Posts &
Telecom, Nanjing, China, in 1999, and his M.E. in Computer Applications from State Key Lab of
Networking & Switching at Beijing University of Posts & Telecom, Beijing, China, in 2002. He completed
his Ph.D. in Electrical and Computer Engineering at the University of Florida under Professor Yuguang
"Michael" Fang in July 2006, and subsequently joined NJIT as an assistant professor of the ECE
department. His primary research interests are network and distributed system security, wireless
networking, and mobile computing with current emphasis on heterogeneous ad hoc networks. He is
currently an Associate Editor of IEEE Transactions on Vehicular Technology and a Feature Editor of IEEE
Wireless Communications.