Dynamic Rate Allocation in Fading Multiple-access Channels

We consider the problem of rate allocation in a fading Gaussian multiple-access channel (MAC) with fixed transmission powers. Our goal is to maximize a general concave utility function of transmission rates over the throughput capacity region. In contrast to earlier works in this context that propose solutions where a potentially complex optimization problem must be solved in every decision instant, we propose a low-complexity approximate rate allocation policy and analyze the effect of temporal channel variations on its utility performance. To the best of our knowledge, this is the first work that studies the tracking capabilities of an approximate rate allocation scheme under fading channel conditions. We build on an earlier work to present a new rate allocation policy for a fading MAC that implements a low-complexity approximate gradient projection iteration for each channel measurement, and explicitly characterize the effect of the speed of temporal channel variations on the tracki...

• Type: Journal
• Year: 2008
• Where: CORR
• Authors: Ali ParandehGheibi, Atilla Eryilmaz, Asuman E. Ozdaglar, Muriel Médard
• Keywords: Approximate Rate Allocation, CORR 2008, Education, Rate Allocation, Rate Allocation Policy