  The use of multiple source nodes with wireless backhaul is considered for
secrecy enhancement through source node selection in future wireless networks.
The ergodic secrecy rate (ESR) of {optimal source node selection in the
presence of multiple eavesdroppers} over independent non-identically
distributed (INID) Rayleigh fading channels is evaluated in closed-form. At
high signal-to-noise ratio (SNR), {the ESR is expressed as a simple weighted
summation where each term relates to the contribution of an individual source
and eavesdropper}. An asymptotic analysis shows the effect of the system
parameters and backhaul reliability on the performance. {The proposed method
can provide a generalized solution for the ESR of optimal \textit{transmit
antenna} selection in multi-antenna systems, optimal \textit{source node}
selection, and optimal \textit{relay selection} with or without unreliable
backhaul.
