A two-user Ricean fading multi-access channel is considered without
state-information at the receiver or the transmitter. The sum-rate
fading number is defined and it is shown that if neither specular
component is zero, then it is strictly smaller than the fading
number that would result if the users could fully cooperate. If one
of the users is required to use circularly-symmetric signaling, then
the fading number is achievable by time-sharing. The problem of
computing the sum-rate fading number without this constraint is
still open.

-||-   _|_ _|_     /    __|__   Stefan M. Moser
[-]     --__|__   /__\    /__   Senior Researcher & Lecturer, ETH Zurich, Switzerland
_|_     -- --|-    _     /  /   Adj. Professor, National Chiao Tung University (NCTU), Taiwan
/ \     []  \|    |_|   / \/    Web: http://moser-isi.ethz.ch/

Last modified: Wed May 10 13:01:03 2006