Uppsala universitet

Benefits of Multiuser Diversity with Limited Feedback.

Mathias Johansson

SPAWC 2003 (Signal Processing Advances in Wireless Communications),
June 15-18 2003.


Abstract:
This work studies the effects of utilizing multiuser diversity in realistic settings with limited feedback and uncertain traffic loads.

A simple optimal method for setting rate quantization levels is derived and it is shown that an added benefit of multiuser diversity is that channel feedback can be heavily quantized without performance loss. In the limit as the number of users goes to infinity, even the most severe rate quantization ($2$ levels) does not reduce throughput at all from the case with unlimited rate resolution. Some important implications for the joint utilization of multiuser diversity and multi-antenna techniques are addressed.

Further, a throughput-optimal scheduling policy for uncertain and bursty traffic loads is derived. An approximate policy is given with attractive computational complexity.

Related publications:
Ph.D Thesis by Mathias Johansson.
SPAWC04
RVK02 paper on multiuser diversity and maximum entropy scheduling.
Globecom 2001 paper.

| Research on these problems at UU | Main entry in list of publications |
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors. All persons copying this information are expected to adhere to the terms and constraints invoked by each authors copyright. This work may not be reposted without the explicit permission of the copyright holders.