  This work investigates the secrecy performance for a simultaneous wireless
information and power transfer system that operates in the presence of
cooperating eavesdroppers. The multi-antenna access point's transmission is
used for information-decoding by a multi-antenna node and for energy-harvesting
(EH) by multiple single-antenna nodes. However, some of the nodes authorized
for EH only attempt to eavesdrop on the ongoing information transmission by
utilizing a generalized on-off power splitting architecture. We derive a
closed-form expression for the secrecy outage probability of the considered
Multiple-Input-Multiple-Output Multiple-Eavesdroppers system. Theoretical and
simulation results are provided to validate the derived results.
