Title :
Optimal power allocation for energy harvesting communications with limited channel feedback
Author :
Rui Ma ; Wei Zhang
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales Sydney, Sydney, NSW, Australia
Abstract :
In energy harvesting (EH) wireless communications, full channel state information (CSI) at transmitter (TX) is generally needed to determine transmission power. In this paper, we propose a transmission power policy based on only 1-bit feedback of the CSI sent from the receiver (RX), for an EH communication system over Rayleigh fading channels. The RX periodically sends 1-bit feedback by comparing the channel power gain with a predetermined threshold. The TX adjusts transmission power based on the 1-bit feedback and its currently available energy. To obtain the optimal channel threshold and transmission power, we formulate a constrained optimization problem to maximize the throughput under an arbitrarily deterministic EH process. Constrained by the battery energy update process and channel state transition process, this problem follows a Markov decision process and can be solved via backward induction method. Simulation results show that our proposed policy has higher throughput performance than other policies.
Keywords :
Markov processes; Rayleigh channels; energy harvesting; radio receivers; radio transmitters; radiocommunication; telecommunication power management; CSI; Markov decision process; Rayleigh fading channels; backward induction method; battery energy update process; channel feedback; channel state information; channel state transition process; energy harvesting wireless communications; optimal power allocation; transmission power policy; Batteries; Energy harvesting; Fading; Markov processes; Throughput; Wireless communication; Markov decision process; energy harvesting; limited channel feedback; transmission power allocations;
Conference_Titel :
Signal and Information Processing (GlobalSIP), 2014 IEEE Global Conference on
Conference_Location :
Atlanta, GA
DOI :
10.1109/GlobalSIP.2014.7032105