Outage-constrained source-sum-power minimization in multiple-sensor single-DF-relay networks with direct links

This paper considers minimizing source-sum-power consumption under outage constraints in a wireless multiple-sensor single-relay network with direct link communication. We consider decode-and-forward (DF) relaying. It is difficult to find the exact expression of the optimal solution to the problem. A suboptimal power allocation and lower bound of the minimum source power consumption are provided. Numerical results show that the performance gap between the proposed suboptimal power allocation and the lower bound becomes small as relay power capacity increases.