Vice President for Research, Innovation and Sponsored Programs at Prairie View A&M University, USA

Biography:Prof. Cajetan M. Akujuobi is the Vice President for Research, Innovation and Sponsored Programs at Prairie View A&M University (PVAMU). He also served for over 3 years as the Vice President for Research and Dean, Graduate Studies at PVAMU. He is the founding Executive Director of many research programs including the Center of Excellence for Communication Systems Technology Research (CECSTR) where he was able to attract research funding exceeding over $20 Million. He is also the Principal Investigator and Co-Executive Director for the SECURE Center of Excellence (Systems to Enhance CYBERSECURITY for Universal Research Environment) where he has received over $7 Million research awards in the last 3 years. He has received several honors and has published extensively including writing books and book Chapters. He has received several honors in research, teaching and service to the community. Two of the books he published with M. O. Sadiku, are "Introduction to Broadband Communication Systems", and "Solution Manual for Introduction to Broadband Communication Systems", both published by Chapman & Hall/CRC and Sci-Tech Publication, Boca Raton, Florida, 2008.

His research interests are Cybersecurity, Wavelet Transform Analysis, Communication Systems, Compressive Sensing, Signal/Image/Video Processing., Broadband Communication Systems, Mixed Signal Systems, Smart & Connected Cities and DSP Solutions. He is a Life Senior Member of the Institute of Electrical and Electronic Engineers (IEEE), Senior Member of Instrument Society of America (ISA), Member of American Society for Engineering Education (ASEE), Sigma XI, the Scientific Research Society, and the Texas Society for Biomedical Research (TSBR) Board of Directors. Prof. Akujuobi has a National Diploma (OND) in Electrical and Electronics Engineering, BSEE, MSEE, MBA and a Ph.D. in Electrical Engineering with specialization in Signal/Image Processing & Communication Systems. He is a licensed Professional Engineer in the State of Texas, USA. He is listed in Who's Who in Science and Engineering, Who's Who in the World, Who's Who in America, Who's Who in American Education and Who's Who in Industry & Finance.

Speech Title: Multi-User Bit-Loading Greedy Algorithm: An Improved Parallel Technique Design with Fairness Control for Discrete Multitone Modulation Systems

Abstract: Crosstalk among loops in a cable affects the SNR of subchannels in Discrete Multitone (DMT) modulation systems. The objective of this talk is to discuss an efficient greedy bit- loading algorithm for multi-user DMT modulation systems. The traditional single user bit- loading algorithm needs to be extended to multi-user case to get the optimal performance. This talk explores the basic theory of discrete greedy bit-loading algorithm for multi-user systems. An improved algorithm is proposed in this talk. Multiple users on a subchannel can get additional bits in parallel, which reduces the number of iterations dramatically. A fairness coefficient is also imported to maintain the variance of data rate among users small.

One of the advantages of DMT is that the power spectral density (PSD) and bits allocated to each subchannel could be chosen according to the subchannel signal-to-noise ratio (SNR) in order to obtain the optimal performance (e.g. maximum data rate, or minimum power consumption). This process is called bit loading and is a critical issue in the design of DMT modulation systems. The adjustable cost elastic coefficient defined the range of power cost. In the bit-loading iteration, all subchannels for different users that have the power cost within the range have the chance to get additional bits assigned to them. The analysis of the simulation results showed that the effectiveness of applying parallel bit loading is significant.