The diversity scheme has been used recently to
improve the reliability of the massage signal by using two or more
communication channels depending on many characteristics.
Maximum Ratio Combining (MRC) is one of the diversity
combining methods by which the signals from each channel are
added together and the gain of each channel is made to
proportionate to the root mean square signal level. In this paper a
diversity technique is proposed to increase the secure capacity
over wireless fading channels. The legitimate user (Bob) takes on
MRC to maximize the probability of secure transmission,
whereas eavesdropper takes on MRC to maximize the probability
of successful eavesdropping. We assume that Bob and Eve follow
different fading channels, Rayleigh and Nakagami-m,
respectively. Depending on these assumptions, closed-form
expression for secrecy outage probability is derived.