Ahmed
S. Ibrahim
This is Ahmed
Ibrahim; a Ph. D. Candidate at the
Engineering Dept.
My major is Communications
and Signal
Processing. My Ph.D. thesis is entitled
Relay deployment
and selection in cooperative
wireless networks.
You can contact me at asalah@umd.edu (asalah [ AT ] umd [ DOT ]
edu )
Phone: (240) 688-5624
I am a student of Prof. K. J.
Ray Liu and a member of the Signals
and Information Group.
More information can be found below, and my Resume is available.
Education Research Interests Skills &
Backgrounds Grant
Proposals
Publications Professional
Experience Honors
& Awards Activities
EDUCATION
Ph. D. Candidate, GPA: 3.83/4
Expected: Sep. 2008
Research topic Relay deployment
and selection in cooperative wireless networks
M.S., GPA: 4/4 Dec. 2007
M.S. Aug. 2004
Thesis title Multilayered space-frequency coding for OFDM
systems
B.S., Cumulative grade: 90% May 2002
2nd on a class of
352 students; Graduation Project MEMS-based IR static earth sensor
Best Speaker Award of the
ECE Seminar Series, University of Maryland, College Park, MD, USA, 2008.
Nominee for Best Student Paper Award, IEEE Conf. on Acoustics, Speech and Signal Processing (ICASSP), 2007.
IEEE Travel Grant for participating in IEEE ICASSP,
Goldhaber Travel Grant,
Schlumberger's Award for best senior students, Schlumberger Company,
Distinction with Honor at B.Sc. degree, 2nd on a class of 352 students, Cairo
University, Cairo, Egypt, 2002.
IMEC Summer Scholarship,
Certificate of Merit, First Class Honors,
SKILLS
& BACKGROUNDS
·
Research
Interests: Cross-layer design of wireless networks, Cooperative
communications for wireless networking, MIMO, OFDM, Cellular systems (LTE, UMB,
WiMAX), Lifetime maximization in wireless sensor networks, Space-frequency
coding for OFDM systems, and Signal processing techniques for data
manipulation.
·
Course-related
Backgrounds: Advanced digital
signal processing, Advanced numerical optimization, Error correcting codes,
Estimation & detection theory, Information theory, Multi-user information
theory, Numerical analysis, Optimal control, Random processes in communication,
Space-time signal processing, System theory, and Wireless communications.
·
Programming
Languages: C, C++, Matlab, and
Perl.
·
Platforms: Linux and Windows.
·
Softwares: Mathematica, VHDL, L-Edit, and PSpice.
Research Assistant, Advisor: Prof. K. J. Ray Liu
·
Relay-Selection in Cooperative Communications: Proposed a relay selection
scheme in multi-node cooperative communications (Matlab); transmission rate is boosted up 75% compared to the
conventional schemes; 3 related papers are published.
·
Cooperative Routing: Proposed a cooperative-based routing algorithm in
wireless ad hoc networks (C/C++, Matlab,
Mathematica); 2 related papers are published.
·
Network Lifetime maximization: Proposed a scheme to
maximize the network lifetime of wireless
sensor networks by adding a set of
relays to it (Matlab); Proposed a scheme to reconnect a disconnected sensor network; 3
related papers are published.
·
Channel estimation error and co-channel interference problems: Showed the impact of
cooperative communications on some of the cellular networks related problems
such as channel estimation error and co-channel interference problems (Matlab).
Intel
Corporation, Mobility Wireless Group,
Communication Systems
Engineering Intern, Mentors: Dr. Yang-Seok Choi & Dr. Shahrnaz Azizi
·
WiMAX (802.16m) Standards: Designing and evaluating wireless transceiver
algorithms for WiMAX 802.16m standards.
Qualcomm
Incorporated, Corporate R&D Division, San Diego, CA May-Aug. 2007
Communication Systems
Engineering Intern, Mentors: Dr. Dhananjay Gore & Dr. Sony Akkarakaran
·
Ultra Mobile Broadband (UMB) Prototype: Develop and test the
modulator/demodulator blocks of all the Forward Link Control Segment (FLCS)
sub-channels via C++; Run simulations under different channel models for both
fixed and floating point blocks; Write a Perl script to generate the
performance curves for all the FLCS sub-channels in an easy and efficient way.
Pharad LLC,
Research Assistant
·
Concealed Weapons Detection: Developed signal
processing techniques for extracting the unique signature of each tested
weapon (Matlab, C/C++); Investigated
various classification techniques to achieve high probability of detection and
low probability of false alarm; 1 related paper is published.
·
Research Assistant: Proposed a multilayered space-time coding scheme;
Proposed a multilayered space-frequency coding scheme in OFDM systems (Matlab); 2
related papers are published.
·
Teaching Assistant: Taught communication and signal processing courses,
including Communication Systems, Digital Communications, and Signals &
Systems.
Research Assistant
·
Micro-Electro Mechanical Systems (MEMS): Tested MEMS-based switches,
capacitors, and transmission lines; Developed Design Rule Checker (
RELEVANT GRADUATE PROJECTS
·
Filterbank Design and
Subband Coding for Images: Designed two-tap perfect reconstruction
(PR) Quadrature mirror filter (QMF) bank; used the designed QMF in performing
subband coding of images.
·
Linear Prediction: Predicted
the Dow Jones Industrial Average (DJIA) weekly closing price.
·
Concealed Weapons Detection: Actively participated in writing a technical proposal
on signal processing techniques for
concealed weapons detection; accepted by the Maryland Industrial Partnerships (MIPS) program, Aug. 2006; Project
budget is $134,324.
·
Border
Surveillance System: Involved in
writing a proposal on signal processing techniques for a cost effective border
surveillance system based on a network of distributed wireless sensors.
ACTIVITIES
·
Paper Reviewer: IEEE Trans. on Communications, IEEE Trans. on Signal Processing, IEEE Trans.
on Wireless Communications, IEEE Journal on Selected Areas in Communications,
IEEE Global Telecommunications Conference (Globecom), IEEE International
Conference on Communications (ICC), IEEE Wireless Communication and Networking
Conference (WCNC), IEEE Information Theory Workshop (ITW), and IEEE Vehicular
Technology Conference (VTC).
·
Technical Program Committee
(
·
Student Member: Institute of Electrical and Electronics Engineers (IEEE).
·
Engineering Graduate Student
Council (EGSC) Member: (Dec. 2004 - May 2006) Led the council in organizing an orientation for the new engineering
graduate students; Participated in preparing a survey about the major problems facing the engineering graduate
students.
PUBLICATIONS
Journal Publications
1. A.S. Ibrahim, A.K. Sadek, W. Su, and K.J.R. Liu, Cooperative communications with relay
selection: when to cooperate and whom to cooperate with?, to appear in IEEE Trans. On Wireless Communication, 2008.
2. A.S.
Ibrahim, Z. Han, and K.J.R. Liu, Distributed energy-efficient cooperative
routing in wireless networks, to appear in IEEE Trans. on Wireless Communication, 2008.
3. K.G. Seddik, A.K. Sadek, A.S. Ibrahim, and K.J.R. Liu, Design
criteria and performance analysis for distributed space-time coding, to
appear in IEEE Trans. on Vehicular Technology,
May 2008.
1. K.G. Seddik, A.S.
Ibrahim, and K.J.R. Liu, Trans-modulation
in wireless relay networks, IEEE
Communications Letter, vol. 12, Is. 3, pp. 170-172, .Mar. 2008.
2. A.S. Ibrahim,
K G. Seddik, and K.J.R. Liu, Connectivity-aware
network maintenance and repair via relays deployment, to appear in IEEE Trans. on Wireless Communication, 2008.
3. A.S. Ibrahim
and K.J.R. Liu, Mitigating channel estimation error and co-channel
interference effects via cooperative communications, in preparation.
Conference Publications
1. A.S. Ibrahim,
K G. Seddik, and K.J.R. Liu, Connectivity-aware
network maintenance via relays deployment, Proc. IEEE Wireless Comm. and
Networking Conference 2008 (WCNC'08), pp. 2573-2578 , Apr. 2008.
1. A.S. Ibrahim,
K G. Seddik, and K.J.R. Liu, Improving
connectivity via relays deployment in wireless sensor networks, Proc. IEEE
Global Telecommunications Conference (Globecom'07), pp. 1159-1163,
Nov. 2007.
2. A.S. Ibrahim,
Z. Han, and K.J.R. Liu, Distributed
energy-efficient cooperative routing in wireless networks, Proc. IEEE Global
Telecommunications Conference (Globecom'07), pp. 44134418, Nov. 2007.
3.
K.G. Seddik, A.K.
Sadek, A.S. Ibrahim, and K.J.R. Liu, Synchronization-aware
distributed space-time codes in wireless relay networks," Proc. IEEE
Global Telecommunications Conference (Globecom'07), pp.
3452-3456, Nov. 2007.
4. A.S. Ibrahim,
K.J.R. Liu, D. Novak, and R.B. Waterhouse, A
subspace signal processing technique for concealed weapons detection, Proc.
International Conference on Acoustics, Speech, and Signal Processing
(ICASSP07), pp. II-401 - II-404, Apr. 2007. (Nominee of the Best Student
Paper Award)
5. A.S. Ibrahim,
A.K. Sadek, W. Su, and K.J.R. Liu, Relay
selection in multi-node cooperative communications: when to cooperate and whom
to cooperate with?, Proc. IEEE Global Telecommunications Conference
(Globecom'06), pp. 1-5, Nov. 2006.
6. A.S. Ibrahim,
A.K. Sadek, W. Su, and K.J.R. Liu, Cooperative
communications with partial channel state information: when to cooperate?,
Proc. IEEE Global Telecommunications Conference (Globecom'05), pp. 3068 - 3072,
Nov. 2005.
7. A.S. Ibrahim, M.M.
Khairy, and A.F. Hussein, Multilayered
space-frequency block coded OFDM systems, Proc. The Global Signal
Processing EXPO and Conference,
8. A.S. Ibrahim,
M..M. Khairy, and A.F. Hussein Multilayered
space-time block codes for OFDM systems, Proc. The International
Conference on Electrical, Electronic and Computer Engineering,
9. A.S. Ibrahim,
A. Adel, A. Ezeldin, A. Ali, A. Hussein, and S.E.-D. Habib, Design and implementation of an area-efficient
MEMS-based IR static earth sensor, Proc. The 15th IEEE
International Conference on Microelectronics (ICM), pp. 143 - 146, Dec. 2003.
10. S. Pamidighantam, W. Laureyn, A.S. Ibrahim, A.
Verbist, H.A.C. Tilmans, A novel process for
fabricating slender and compliant suspended poly-Si micro-mechanical structures
with sub-micron gap spacing, Proc. The 15th IEEE Conference on Micro
Electro Mechanical Systems, pp. 661-664, 2002.
REFERENCES Available Upon Request