Faculty Profile

Ahmed, Khawza Iftekhar Uddin, Ph.D.

ProfessorEmail : khawza@eee.uiu.ac.bd

Ph.D., Electrical Engineering, Arizona State University (ASU)(http://www.asu.edu), USA. Currently working as an Associate Professor in the Department of Electrical and Electronic Engineering, United International University (UIU), Bangladesh (http://www.uiu.ac.bd). Ph.D. Dissertation focuses on signal processing techniques for wireless communication systems; in particular: the analysis and implementation of performance-loss due to channel estimation error and performance-enhancement by the design of optimal training in multicarrier (Orthogonal Frequency Division Multiplexing (OFDM)) and Multiple-Input Multiple-Output (MIMO) systems in wireless fading channels. Worked as a member of technical sta in Olympus Communication Technology of America (http://www.olympus-cta.com), San Diego, CA 92121, USA and was involved in design, simulation and implementation of Ultra Wide Band (UWB) transceiver for short range wireless link. Technical skills focus on designing and developing di erent algorithms, architecture and signal processing techniques for baseband communication systems such as Wireless Cellular Network, Wireless Broadband Network, Wireless Personal Area Network (WPAN), Public Switch Telephone Network (PSTN), Local Area Network (LAN), Wide Area Network (WAN). Familiarity with di erent state of the art standards such as Wide Band Code Division Multiple Access(W-CDMA), CDMA 2000, IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), Bluetooth, WiMedia Multiband OFDM (MBOA), Digital Subscriber line (DSL), Voice over IP (VoIP). Filed a patent on the invention of increased ranging accuracy of ad-hoc wireless networks. Lead a team of con-
sultants on behalf of Islamic Corporation for the Development (ICD) of the Private Sector, the private sector development wing of the Jeddah (Saudi Arabia) based Islamic Development Bank (IDB), for the assessment of a Broadband Wireless Access project. From 2008-2010, Worked as a board member of Bangladesh Submarine Cable Company Limited (Ltd) (BSCCL), as state owned company established in 2008 to oversee the operation of the lone submarine cable in Bangladesh. Contributed actively in important policy making and technical decisions since its inception that shaped it to the present structure with a complete functional organogram. Current interest of research includes machine and statistical learning algorithms for biomedical signal processing.

Ph.D., Electrical Engineering, Arizona State University (ASU) (http://www.asu.edu), AZ 85287, USA,
August 2005, Dissertation title: E ect of Channel Estimation on Multicarrier and MIMO Systems
in Wireless Channels”, Co-advisors: Dr. Andreas Spanias (http://www.eas.asu.edu/spanias) and
Dr. Cihan Tepedelenlioglu (http://www.eas.asu.edu/cihan), Department of Electrical Engineering
(http://www.eas.asu.edu/eee), ASU
 M. Sc., Electrical and Electronic Engineering, Bangladesh University of Engineering and Technology
(BUET) (http://www.buet.ac.bd), Dhaka 1000, Bangladesh, June 2000, Thesis: Fuzzy Incorporated
Noise Compensation Technique for Autoregressive Spectral Estimation”, Advisor: Dr. Md. Kamrul
Hasan (http://203.208.166.84/khasan)

 B.Sc., Electrical and Electronic Engineering, Bangladesh University of Engineering and Technology
(BUET), Dhaka 1000, Bangladesh, May 1996

Consultancy Work

  •  Assessment of broadband wireless access project of X.net Limited October 2007 February 2008,
    Islamic Corporation for the Development (ICD).
  •  Veri cation of Cost of Equipments of the NTTN project from Fiber @Home 2009, IDCOL, Bangladesh

Teaching Experience

  •  Professor, Department of Electrical and Electronic Engineering, United International University
    (http://www.uiu.ac.bd), November 2014 – to date. O ering graduate and undergraduate courses in
    the department. Supervising students for project and thesis. Conducting research in the eld of
    contemporary topics of wireless communications and signal processing. Engaged in di erent activities
    related with the development of the department.
  • Associate Professor, Department of Electrical and Electronic Engineering, United International
    University October 2009 – November 2014. O ering graduate and undergraduate curses in the depart-
    ment. Supervising students for project and thesis. Conducting research in the eld of contemporary
    topics of wireless communications and signal processing. Engaged in di erent activities related with
    the development of the department.
  •  Assistant Professor, Department of Electrical and Electronic Engineering, United International
    University (http://www.uiu.ac.bd), September 2007 – October 2009. O ering graduate and under-
    graduate courses in the department. Supervising students for project and thesis. Conducting research
    in the eld of contemporary topics of wireless communications and signal processing.
  •  Assistant Professor, Department of Electrical and Electronic Engineering, American International
    University – Bangladesh (http://www.aiub.edu), August 2006 – August 2007. Engaged in the arrange-
    ment and participation of several eld trips, and seminars in the department. O ered a new course
    entitled as `Wireless Networks and Mobile Systems’.
  • Teaching Assistant, Digital Signal Processing (DSP) Lab (http://www.eas.asu.edu/eee407), De-
    partment of Electrical Engineering, Arizona State University, USA, January 2001 – May 2005. Re-
    sponsibilities include conducting and designing labs using J-DSP (Java DSP) (http://jdsp.asu.edu),
    and maintaining the lab server as system administrator.
  • Lecturer, Department of Electrical and Electronic Engineering, Ahsanullah University of Science
    and Technology (http://www.aust.edu), Bangladesh, September 1997 – July 2000. O ered courses
    on Control Theory, Signal and Systems, Measurement and Instrumentations, Electrical Networks,
    Electrical Designs, and conducted labs for the students in di erent levels. Supervised the installation
    of PABX system and Generator in the University Campus.
  • Part time Lecturer, Department of Electrical and Electronic Engineering, Ahsanullah University of
    Science and Technology, 1997.

 

Industrial Experience

  • Member of Technical Sta , Baseband research group, Olympus Communication Technology of
    America (http://www.olympus-cta.com), San Diego, CA 92121, USA, June 2005 – July 2006. Worked
    as a research engineer in the baseband group of the R&D center and was involved in design, simulation
    and implementation of Ultra Wide Band (UWB) transceiver for short range wireless link. Involved
    in two projects: (i) Project Ranging: Filed a patent on Ranging and method based on our invention
    on the improved accuracy of ranging with phase-o set multiple measurements in di erent practical
    constraints such as clock frequency o set, correlation base packet detection etc. Completed Floating
    and Fixed point simulation results on the performance of ranging and obtained di erence performance
    graph. (ii) Project PHY(physical layer) demo: Added additional higher rates to the PHY, namely, 80
    Mbps, 106.7 Mbps, 160 Mbps. Modi ed the Fixed point library for better matching of the test vectors.
    Completed the generation and matching of test vectors for the transmitter for di erent con gurations
    with di erent rates, TFCs, di erent odd and even packet length, scrambler seeds. Completed PLCP
    header processing, Read-Solomon encoder integration, Frame Check Sequence generator integration.

Research Experience:

  • January 28, 2010 – Nov 28, 2010. Worked as a post doctoral research fellow in the Faculty of Computing
    and Engineering in Sta ordshire University, Sta ord, UK.Worked on varieties of problems on di erent
    applications of signal processing.
  • June 15, 2005 – July 15, 2006. Worked as a research engineer in Baseband group of R&D center of
    Olympus located at San Diego, CA. For accomplishments please see my accomplishment as a `Member
    of Technical Sta ’ in the above section of professional experience.
  • August 2002 – May 2005, aliated with COMMUNICATION SYSTEMS LABORATORY
    (http://www.fulton.asu.edu/trccomm/index.html) in the Department of Electrical Engineering, Ari-
    zona State University. Investigating the e ect of channel estimation errors, optimal training for mul-
    ticarrier and MIMO systems in wireless channels.
  • From 1998-2000, aliated with Signal Processing Lab, Bangladesh University of Engineering and
    Technology, and developed a fuzzy-incorporated novel autoregressive spectral estimation technique
    using noisy observations.

Teaching Interests:
 Wireless and Personal Communication, Simulation of Communication Systems, Digital Communica-
tion, Stochastic Processing, Speech and Audio Processing, Digital Signal Processing, System Identi -
cation, Information Theory, Error Control Coding, Adaptive Filtering and Application, Telecommuni-
cation Networks, Information theory and coding, Communication Engineering, Probabilistic Methods
in Electrical Engineering, Signals and Systems, Broadband Network, Space-Time Communications,
Multicarrier Communications
Research Interests
Cross layer design issues of MANET, wireless communications, signal processing aspects in wireless
and sensor networks, statistical signal processing, estimation and equalization algorithms for wire-
less systems, MIMO systems, space-time coding, OFDM systems, diversity techniques, digital signal
processing

Patent
G. Heidari and K. Ahmed, Ranging system and method”, U.S. Patent (Pending), Feb. 28, 2006.
This US Patent (status: pending) is based on our invention on the improved accuracy of ranging with
phase-o set multiple measurements in di erent practical constraints such as clock frequency o set,
correlation base packet detection etc.
List of Publications
Patent
US patent no. 7,450,069, Ranging System and Method”, Heidari-Bateni; Ghobad, Ahmed; Khawza
Iftekhar-Uddin, Olympus Corporation Technology of America (San Diego, CA) , Issued on: Novem-
ber 11, 2008, Filed on: February 27, 2006, Application no.: 11/ 364,522
Book
Khawza I. Ahmed, Channel Estimation of Wireless Channels: E ect on the Performance of Mul-
ticarrier and MIMO Systems,” VDM Verlag, August 2010, ISBN-10: 3639270398
Journal Submitted (Under Review)
Abdullah Al Helal, Khawza I Ahmed, Md. Saifur Rahman and S. Kaisar Alam, Sparse Representa-
tion in Ultrasound Imaging for Breast Lesion Classi cation by Exploiting Redundancy”, submitted
in Ultrasound in Medicine and Biology
Journal (Published)
S. J. Nawaz, K. I. Ahmed, M. N. Patwary and N. M. Alam, Superimposed Training Based Com-
pressed Sensing of Sparse Multipath Channels”, IET Communications, vol. 6, issue 18, pp. 3150-
3156, December 2012
K. I. Ahmed, C. Tepedelenlioglu, A. Spanias, M. N. Patwary and H. Yu, Error Probability Based
Optimal Training for Linearly Decoded Orthogonal Space-Time Block Coded Wireless Systems.”
IET Communications, vol. 5, issue 11, pp. 1512-1529, July 2011
Khawza I. Ahmed, Cihan Tepedelenlioglu, and Andreas Spanias, Performance of precoded OFDM
with channel estimation error”, IEEE Transactions on Signal Processing, vol. 54, issue 3, pp.
1165-1171, March 2006.
A. Spanias, V. Atti, A. Papandreou-Suppappola, K. I. Ahmed, M. Zaman and T. Thrasyvoulou,
On-line Signal Processing Using J-DSP”, IEEE Signal Processing Letters, vol. – 11, issue: 10,
pp.821-825 Oct. 2004.

Md. Kamrul Hassan, Khawza I. Ahmed, and Yahagi, Further Results on Autoregressive Spec-
tral Estimation from Noisy Observations”, Journal of the Institute of Electronics, Information and
Communication Engineers (IEICE), Japan, vol.E84-A, no.2. pp. 577-588, Feb. 2001.
Conference Proceedings ( Published)
G.M.A Ehsanur Rahman, Md. Abdul Mukit, Raqibul Mostafa, K. I. U. Ahmed and Murtaza Ali,
Development and Demonstration of a Prototype e-ECG System for Telemedicine Application” in
8th International Conference on Software, Knowledge, Information Management and Applications
(SKIMA 2014), Dhaka, Bangladesh, Dec 18-20, 2014
Saha, S. and Ahmed, K. I., Ecient Event Related Oscillatory Pattern Classi cation for EEG
Based BCI Utilizing Spatial Brain Dynamics”, in Electrical and Computer Engineering (ICECE),
2014 International Conference on, Dhaka, December, 2014
Khan, H.A., Al Helal, A. and Ahmed, K.I., Handwritten Bangla digit recognition using Sparse Rep-
resentation Classi er”, in Informatics, Electronics and Vision (ICIEV), 2014 International Confer-
ence on, volume 3, pages 1{6, Dhaka, May 2014
Helal, A. A., Ahmed, K. I., Rahman, M. S., and Alam, S. K.Breast Cancer Classi cation from
Ultrasonic Images Based on Sparse Representation by Exploiting Redundancy”, in Computer and
Information Technology (ICCIT), 2013 16th International Conference on, volume 16, pages 92{97,
Dhaka, March 2014
Ehsan ur Rahman, G.M.A., Ahmed, K.I., Mostafa, R. and Khan, F., A novel smart meter-
ing system for loss reduction and ecient load management in the power distribution sector of
Bangladesh”, in Advances in Electrical Engineering (ICAEE), 2013 International Conference on,
Dhaka, Bangladesh, Dec 19-21, 2013
Ansary, M.A.A., Chowdhury, R.R., Ehsan, M.R., Anisuzzaman, M., Khan, H.A. and Ahmed, K.I.,
Comparison between time domain and frequency domain strain estimation in elastography”, in Ad-
vances in Electrical Engineering (ICAEE), 2013 International Conference on, Dhaka, Bangladesh,
Dec 19-21, 2013
Md Nur Alam, Mohammad Ra qul Islam, Al-Imran Romio, Rezaul Karim and Khawza I Ahmed,
Detection and Multi-stage Classi cation of Diabetic Retinopathy by Using Image Processing with
SVM”, in International Conference on Biomedical Systems, Signals and Images, (BISS 2012), De-
partment of Applied Mechanics Indian Institute of Technology Madras, India, Nov 28 Dec 1, 2012
Akbar Sheikh Akbari, Khawza I U Ahmed, P. Bagheri Zadeh, Mansour R Moniri, Multi-resolution,
perceptual and compressive sampling based image codec”, in IET Conference on Image Processing
(IPR 2012), London, UK, Jul 3-4, 2012
J. B. Mughal, K. I. Ahmed, A. H. Solaiman, and M. N. Patwary, Subspace Compressive Sensing for
Beamformed Cooperative Wireless Sensor Networks, ” in 2011 IEEE Jordan Conference on Applied
Electrical Engineering and Computing Technologies (AEECT), Amman, Jordan, Dec 6-8, 2011

S. K. Bolisetti., K. I. Ahmed, M. Patwary, and M. Abdel-Maguid, Compressive parametric GLRT
detector for airborne MIMO radar, ” in Wireless Communications and Signal Processing (WCSP),
2011 International Conference on, Nanjing, China, nov. 9-11, 2011 pp. 1-5
11  K. I. Ahmed, M. Patwary, and H. Yu, Performance enhancement of space time block coded mimo
systems using training design,” in Electrical and Computer Engineering (ICECE), 2010 International
Conference on, pp. 706 709, 2010.
N. Begam, F. Rahman, and K. Ahmed, Analysis of propagation model performance in wimax
(ieee 802.16e)-based wireless mobile vehicular networks, in Electrical and Computer Engineering
(ICECE), 2010 International Conference on, pp. 714 717, 2010.
K. Ahmed, S. Kothuri, M. Patwary, and M. Abdel-Maguid, Subspace compressive glrt detector for
airborne mimo radar,” in Communications (APCC), 2010 16th Asia-Paci c Conference on, pp. 302
306, oct. 31-nov. 3 2010.
Md. Shahedul Amin, Ahmed-Ur-Rahman, Saabah-Bin-Mahbub, Khawza I. Ahmed1 and Zahidur
Rahim Chowdhury, Estimation of Direction of Arrival (DOA) Using Real-Time Array Signal Pro-
cessing”, in International Conference on Electrical and Computer Engineering, (ICECE), Dhaka,
Bangladesh, Dec 20-22, 2008 pp:422 – 427
Khawza I. Ahmed, and Ghobad Heidari, Improving Two-Way Ranging Precision with Phase-o set
Measurements”, in Proceedings of IEEE Global Telecommunication (GlobeCom), San Francisco, CA,
USA, Nov. 27 – Dec. 1, 2006, pp 1-6.
Khawza I. Ahmed, Cihan Tepedelenlioglu, and Andreas Spanias, Optimal Training and Per- for-
mance Analysis of Space-Time-Frequency Coded OFDM”, in Proceedings of IEEE International
Conference on Communications (ICC), Istanbul, Turkey, June 11-15, 2006, vol 7, pp 2929-2934
Khawza I. Ahmed, Cihan Tepedelenlioglu and Andreas Spanias, PEP-based Optimal Training
for MIMO Systems in Wireless Channels”, in Proceedings of IEEE International Conference on
Acoustics, Speech and Signal Processing (ICASSP), Philadelphia, PA, USA, March 18-23, 2005,
vol.3, pp iii/793-iii/796.
Khawza I. Ahmed, Cihan Tepedelenlioglu and Andreas Spanias, On the Performance of Optimal
Training-based OFDM with Channel Estimation Error”, in Proceedings of IEEE Global Telecom-
munication (GlobeCom) Conference, Dallas, TX, USA, Nov 27-30, 2004, vol-IV, pp 2404-08.
Khawza I. Ahmed, Cihan Tepedelenlioglu and Andreas Spanias, E ect of Channel Estimation
On Pairwise Error Probability in OFDM”, in Proceedings of IEEE International Conference on
Acoustics, Speech and Signal Processing (ICASSP), Montreal, Canada, May 17-21, 2004, vol-IV,
pp. 745-748.
A. Spanias, K. I. Ahmed, A. Papandreou-Suppappola, and M. Zaman, Assessment of the Java-
DSP (J-DSP) On-Line Laboratory Software”, in 33rd ASEE/IEEE FIE-03, Boulder, Colorado,
USA, Nov. 5-8, 2003, vol. 1, pp. T2E 16-21.
M. K. Ahmed, K. I. Ahmed, A Joint Technique for Autoregressive Spectral Estimation from Noisy
Observations”, in IEEE TENCON 2000 Proceedings, vol-2, Kuala Lumpur, Malaysia, Sep. 24-27,
2000, pp. 120-125.

Technical Report
Khawza I. Ahmed, E ect of Channel Estimation on Multicarrier and MIMO Systems in Wireless
Channels”, Ph.D. Dissertation, submitted to the Department of Electrical Engineering, Arizona State
University, August 2005.
Khawza I. Ahmed, Time Varying Channel Estimation of Wireless Channels”, an independent study
report, submitted to the Department of Electrical Engineering, Arizona State University, May 2004.
Khawza I. Ahmed, Blind Identi cation and Equalization of Mobile Channels”, Ph.D. qualifying
report, submitted to the Department of Electrical Engineering, Arizona State University, May 2002.
Khawza I. Ahmed, Fuzzy Incorporated Noise Compensation Technique for Autoregressive Spectral
Estimation”, M. Sc. thesis, submitted to the Department of Electrical Engineering, Bangladesh
University of Engineering and Technology, Bangladesh, June 2000.
Course Work in Ph.D.
 Broad Band Network, Random Signal Theory, Wireless Communication, Signal Processing for Wireless
Communication, Detection and Estimation Theory, Information Theory, Multi-carrier Communica-
tion, Digital Communication, Digital Signal Processing, Digital Spectral Analysis, Speech Coding and
Multimedia
Accomplished Projects in Ph.D.

  •  Implementation of LMS adaptive equalizer to combat the ISI over slowly varying frequency selective
    channel
  •  Fading channel simulation over frequency-at and frequency-selective fading channels and their e ect on the performance of uncoded digital transmission
  •  Performance analysis of di erent diversity techniques over at-fading channel: maximal ratio combin-
    ing (MRC), equal gain combining (EGC), and coding gain through convolution coding
  • Suppression of jamming interference for DS-CDMA transmission  Design and simulation of CP-OFDM scheme over frequency-selective slowly varying channel
  • The constant modulus algorithm (CMA) for blind adaptive signal processing in wireless Communica-
    tion. The application of CMA on blind equalization, blind source separation and reduction in ISI in
    antenna arrays are considered
  • Design and implementation of sequential detector to detect the presence of a signal with known
    property in presence of noise
  • Estimation of amplitude and time delay of di erent signal in presence of noise. Cramer-Rao bound
    is calculated and compared with the variance of Maximum Likelihood estimator obtained through
    Monte Carlo simulation
  • Detection of sinusoidal signal with unknown amplitude and time delay  Hands-On experience with a source-system vocoder: LPC-10e. Di erent tests are done on LPC-10e through modifying and adding the given Matlab codes, e.g., pitch estimation procedure through AMDF, voicing detection, LPC parameter estimation, quantized and unquantized LPC spectra, com-parison between FFT and LPC spectra, and di erent excitation signals at decoder
  • Isolated digit recognition using Hidden Markov Models (HMM) The project deals with two issues :
    preprocessing of the speech vectors and recognition of speech using HMM
  • FFT based adaptive noise cancellation technique
  • Blind signal processing using information-theoretic objective function
  • Comparison of di erent digital spectral estimation techniques e.g. Blackman-Tukey, Welch Peri-
    odogram, Yule-Walker, Burg, covariance and modi ed covariance, adaptive LMS, MUSIC for a given
    set of noisy data

  • Awarded Graduate Teaching Assistant (TA) Scholarship in the Department of Electrical En-
    gineering in Arizona State University since January 2001
  • Selected for the membership in `Phi Kappa Phi’ and `The National Society of Collegiate
    Scholars’ for outstanding academic achievements at Arizona State University
  • Obtained talent-pool board scholarship in the undergraduate education in Electrical Engineering
  • Rank: 12th position out of more than one hundred thousand students in the combined
    merit list of Board of higher secondary school (HSC) education
  • IEEE Member

  • Board Member 2008-2010: Worked as a board member of Bangladesh Submarine Cable Company
    Limited (Ltd) (BSCCL), as state owned company established in 2008 to oversee the operation of the
    lone submarine cable in Bangladesh. Contributed actively in important policy making and techni-
    cal decisions since its inception that shaped it to the present structure with a complete functional
    organogram.
  • Lead Consultant: Took the lead role as a consultant for Islamic Corporation for the Develop-
    ment (ICD) of the Private Sector, the private sector development wing of the Jeddah (Saudi Arabia)
    based Islamic Development Bank (IDB) for the assessment of Broadband Wireless Access project in
    Bangladesh.
  • Reviewer: Worked as a reviewer for several journals including IEEE Transactions on Wireless Com-
    munication, IEEE Transactions on Vehicular Technology and also for renowned international con-
    ferences such as International Conferences on Acoustics, Speech and Signal Processing (ICASSP),
    International Conference on Communications (ICC), IEEE International Symposium on Circuits and
    Systems (ISCAS), European Signal Processing Conference (EUSIPCO).
  • Programme Committee Member: International Conference on Computer Science and its Ap-
    plication (ICCSA), WWW: http://www.conferencehome.com/iccsa.htm, San Diego, California, June
    27-29, 2006.
  • Penalist: Panel Title: Next Generations Wireless Technologies, ICCSA, San Diego, CA, June 27-29,
    2006
  • Session Chair, ICCSA, San Diego, CA, June 27-29, 2006
  • Judge in the evaluation of research projects of M.Sc. students of Wireless Communication degree
    program of National University, San Diego, California, May 2006.
     Participated in di erent workshops organized by `Preparing Future Professionals (PFP)’ at Arizona
    State University
  • Participated in a week-long workshop on state-of-the-art speech Recognition techniques at Mississippi
    State University in May 2001
  • Participated in di erent technical seminars and conferences
  • Presented technical work to di erent audiences