This work analyzes the gains of cooperative relaying in interference-limitednetworks, in which outages can be due to interference and fading. A stochasticmodel based on point process theory is used to capture the spatial randomnesspresent in contemporary wireless networks. Using a modification of thediversity order metric, the reliability gain of selection decode-and-forward isstudied for several cases. The main results are as follows: the achievable\emph{spatial-contention} diversity order (SC-DO) is equal to one irrespectiveof the type of channel which is due to the ineffectiveness of the relay in theMAC-phase (transmit diversity). In the BC-phase (receive diversity), the SC-DOdepends on the amount of fading and spatial interference correlation. In theabsence of fading, there is a hard transition between SC-DO of either one ortwo, depending on the system parameters.
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