2012/08/30 by Kaya Tutuncuoglu, Tutuncuoglu, Kaya, Aylin Yener +1
Engineering · #Advanced MIMO Systems Optimization #Energy Harvesting in Wireless Networks #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Power Transfer Systems
paper · pdf · doi:10.48550/arxiv.1208.6273
openalex publication_date 2012/08/30 · openalex created_date 2025/10/24 · openalex updated_date 2026/07/28
In this paper, short-term throughput optimal power allocation policies are\nderived for an energy harvesting transmitter with energy storage losses. In\nparticular, the energy harvesting transmitter is equipped with a battery that\nloses a fraction of its stored energy. Both single user, i.e. one\ntransmitter-one receiver, and the broadcast channel, i.e., one\ntransmitter-multiple receiver settings are considered, initially with an\ninfinite capacity battery. It is shown that the optimal policies for these\nmodels are threshold policies. Specifically, storing energy when harvested\npower is above an upper threshold, retrieving energy when harvested power is\nbelow a lower threshold, and transmitting with the harvested energy in between\nis shown to maximize the weighted sum-rate. It is observed that the two\nthresholds are related through the storage efficiency of the battery, and are\nnondecreasing during the transmission. The results are then extended to the\ncase with finite battery capacity, where it is shown that a similar\ndouble-threshold structure arises but the thresholds are no longer monotonic. A\ndynamic program that yields an optimal online power allocation is derived, and\nis shown to have a similar double-threshold structure. A simpler online policy\nis proposed and observed to perform close to the optimal policy.\n