Outage Minimization in Fading Channels: Optimal Power Allocation with Channel Distribution Information Known at Transmitter
This paper revisits the optimal power allocation for outage minimization in the classic point-to-point fading channels with the Channel Distribution Information (CDI) known at the transmitter. The channel state information (CSI) is assumed to be perfectly known at the receiver, but not available at the transmitter. In particular, the authors consider a finite horizon of N- block transmissions subject to an average power constraint at the transmitter. Although minimizing the time-averaged per-block outage probability over each N-block transmission is shown to be a non-convex problem for a large class of practical fading channels, they show that the globally optimal power allocation is obtainable by a simple one-dimensional search.