THE NORTH JERSEY CHAPTER OF THE IEEE COMMUNICATIONS SOCIETY
and
THE CENTER FOR COMMUNICATIONS AND SIGNAL PROCESSING RESEARCH
of
NEW JERSEY INSTITUTE OF TECHNOLOGY
Present
RECENT RESULTS IN MULTISTAGE DETECTION
by
Branimir R. Vojcic
WHEN: Friday, December 15, 1995, 11:30 a.m. (refreshments at 11:15AM)
WHERE: Room 202 of the Electrical and Computer Engineering Center, New Jersey
Institute of Tech.
ABSTRACT
Multiuser detection is seen as a means of improving capacity in Code Division
Multiple Access (CDMA) systems, especially in the presence of power control
error (the near-far problem). In this talk we will give a brief overview of
current trends in multiuser detection for high capacity multiuser communi-
cations. The focus of the talk will be on multistage detection as one of the
approaches in multiuser detection. Multistage detection is a non-linear
detection scheme (feedback interference cancellation) of linear complexity in
the number of users. It will be argued that this technique can be implemented
in software in centralized receivers, as a baseband technique employing the
matched filter outputs. That is, it can be implemented even in existing
systems that have open software architecture and enough computational power,
without adding new hardware. Several techniques that significantly improve
performance of multistage detectors will be discussed. Specifically, we will
discuss soft interference cancellation, combined forward error correction and
multistage detection, and error detection-added interference cancellation.
Finally, multistage detection in noncoherent channels will be addressed.
BIOGRAPHY
Dr. Vojcic received the Dipl. Eng., the M.S., and the D.Sc. degrees in
electrical engineering in 1981, 1986, and 1989, respectively, all from the
Faculty of Electrical Engineering, Belgrade University. In 1991 he joined
the George Washington University, where he is currently an Assistant
Professor in the Department of Electrical Engineering and Computer Science.
His research interests are in the areas of communication theory, wireless
communication networks, and spread spectrum communications. Most recently, he
was involved in research related to the design and performance analysis of
multiple-access communications for mobile applications, including the multi-
user detection for such systems. Dr. Vojcic received NSF Faculty Early
Career Development Award for 1995.
For more information, contact Professor N. Ansari, (201) 596-3670,
e-mail: ang@faraday.njit.edu