Adaptive power allocation in energy-constrained wireless ad-hoc networks

In this paper, we proposed a new power allocation scheme in a cooperative relay network to increase network lifetime. To maximize network lifetime, it is important to allocate power fairly among nodes in a network as well as to minimize total transmitted power. In the proposed scheme, the allocated power is proportional to the residual power, satisfies the required SNR at destination node and minimizes the total transmission power. In this paper, we calculate power allocation in "amplify and forward" (AF) model. We evaluated the proposed power allocation scheme using extensive simulation and simulation results show that proposed power allocation obtains much longer network lifetime than the traditional power allocation and the power consumption of each node is balanced. Proposed power allocation scheme are effective in optimizing the system performance, reducing the network power consumption, and prolong the network lifetime.