Capacity of a Gaussian MAC with Energy Harvesting Transmit Nodes
The authors consider a Gaussian Multiple Access Channel (GMAC) where the users are sensor nodes powered by energy harvesters. The energy harvesters may have finite or infinite buffer to store the harvested energy. First, they find the capacity region of a GMAC powered by transmit nodes with an infinite energy buffer. Next, they consider a GMAC with the transmitting nodes equipped with a finite energy buffer. Initially, they assume perfect knowledge of the buffer state information at both the encoders and the decoder. They provide an achievable region for this case. They also generalize the achievable region when only partial information about buffer state is available at both the encoders and the decoder.