  In this paper, an extended large wireless network under the secrecy
constraint is considered. In contrast to works which use idealized assumptions,
a more realistic network situation with unknown eavesdroppers locations is
investigated: the legitimate users only know their own Channel State
Information (CSI), not the eavesdroppers CSI. Also, the network is analyzed by
taking in to account the effects of both fading and path loss. Under these
assumptions, a power efficient cooperative scheme, named \emph{stochastic
virtual beamforming}, is proposed. Applying this scheme, an unbounded secure
rate with any desired outage level is achieved, provided that the density of
the legitimate users tends to infinity. In addition, by tending the legitimate
users density to the infinity, the tolerable density of eavesdroppers will
become unbounded too.
