Optimizing Data Transmission Power for ARQ Energy Efficiency under Imperfect CSI
Ali Zarei Ghanavati, Daniel C. Lee · 2017
In this paper, we study the issue of optimizing the data transmission power (energy per symbol) for minimizing the expected energy required to successfully deliver a packet to the destination in a wireless point-to-point link through automatic repeat request (ARQ). We focus on the system that has a slow fading wireless channel and employs a pilot symbol-assisted modulation (PSAM) scheme along with a channel estimation scheme based on the minimum mean square error (MMSE) criterion. We derive the expected energy as a function of the data transmission power. Then, we derive a closed-form expression of the data transmission power that minimizes that function.