Secure beamforming method for the MISO SWIPT system.

To solve the information security issue in the multiple input single output (MISO) simultaneous wireless information and power transfer (SWIPT) system, an artificial noise (AN)-aided beamforming scheme is proposed, and further formulating the problem as a power control problem under user requirement constraint. However, this problem is of huge non-convex complexity and cannot be solved in polynomial time. Therefore, an efficient two-tier algorithm is developed for a sub-optimal solution, which is extended further to the imperfect channel conditions for a robust beamforming scheme. Simulation results show that the two-tier algorithm has better performance and more robustness when compared with the classic zero-forcing (ZF) algorithm, and the advantage of it is more obvious as the channel estimation error increases. [ABSTRACT FROM AUTHOR]