On the sum capacity of multipath fading MAC with distributed CSI

We consider a two-user multipath fading MAC with distributed CSI. The fading distributions are assumed to be identical for each of the links. Each transmitter employs distributed power/rate adaptation schemes based on its own measured channel values, i.e. without knowing the fading parameters of the other user. In a block fading set up and under average power constraints, we propose communication strategies which will maximize the sum-throughput, at the same time ensuring that there is negligible outage in every transmission block. We then extend our schemes to MIMO communications in presence of multi-path fading, and show their performance.