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The explosion of mobile data traffic calls for new efficient 5G technologies beyond what current 4G LTE can provide. Massive MIMO, which has shown the great potential in improving the achievable rate with a very large number of antennas, becomes a popular candidate. However, several critical challenges in designing the analog front-end and coordinating the large-scale antenna array have to be carefully addressed before the massive MIMO can be actually adopted.

Recent emphasis on green communications has engendered great interest in the investigations of energy harvesting communications and networking. Energy harvesting from ambient energy sources can potentially reduce the dependence on the supply of grid or battery energy, providing many attractive benefits to the environment and deployment. However, unlike the conventional stable energy, the intermittent and random nature of the renewable energy makes it challenging in the realization of energy harvesting transmission schemes.

The Smart Grid, generally referred to as the next-generation power system, is considered as
a revolutionary and evolutionary regime of existing power grids. More importantly, with
the integration of advanced computing and communication technologies, the Smart Grid
is expected to greatly enhance efficiency and reliability of future power systems with
renewable energy resources, as well as distributed intelligence and demand response.
Along with the silent features of the Smart Grid, cyber security emerges to be a critical