  This letter proposes a dynamic power splitting scheme (DPSS) for
decode-and-forward (DF) based cooperative simultaneous wireless information and
power transfer (SWIPT) networks with direct link. The relay node adopts an
optimal dynamic power splitting factor determined by instantaneous channel
state information (CSI) to harvest energy and process information. The
expressions for the optimal dynamic power splitting factor, outage probability
and ergodic capacity of the proposed network are derived. Numerical results
show that the proposed scheme is better than or the same as the existing PS
schemes in terms of outage probability, while it achieves higher ergodic
capacity compared to the existing PS schemes.
