University of Minnesota


Mobile Communications and Networking for Wireless-Wireline Multimedia Transmissions


G. B. Giannakis


M. -S. Alouini, M. Kaveh, J. C. Kieffer,
A. H. Tewfik (ECE) and Z.-L. Zhang (CSE)

Emerging broadband wireless networks for multimedia information dissemination demand increasingly higher and variable rates. The integration of wireline-wireless networks, the size and low-power limitations in portable units, user mobility, and channel propagation effects pose major challenges to wideband communications (see Fig. 1). Code Division Multiple Access (CDMA) and Multi-Carrier (MC) systems offer two schemes with great potential to cope with these challenges, provided that their complementary advantages and performance limitations, in the presence of multipath propagation and multiuser interference, are dealt with. Specifically, guaranteed cancellation of MUI and multipath effects in the uplink and the challenges presented by the a priori unknown mobile channel for wireless multimedia transmissions have not been addressed, and constitute the primary motivation behind the wideband multiple access system developed in this project.

Figure 1: scenario

Fig 1. A mobile multimedia wireless communication scenario

With regards to the trends in telecommunication research and development depicted by Fig. 2, it is the objective of this project to develop a generalized MC-CDMA system that shifts upwards the information rate versus mobility hyperbola (see arrow in Fig. 2). The main components of our design for broadband wireless mobile communications are:

  1. adaptive, scalable and robust joint source/channel coding and multiple access techniques that account for power consumption and networking issues;
  2. flexible generalized MC-CDMA precoder design  with an MUI-resilent simple linear receiver that is also robust to frequency selective fading;
  3. theoretical performance analysis and experimental validation on a  testbed to serve as a key technology facility for near future broadband systems development and as a vehicle for multidisciplinary university research and enhanced student training.
Figure 2: Pictorial view image

Fig 2. Pictorial view of our goal in the mobility-rate trends for wireless communications



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