Exact Throughput Analysis of Random CoopMAC Networks in the Presence of   Shadowing
  The throughput performance of a random cooperative medium access control (CoopMAC) network in the presence of shadowing is considered. The nodes are assumed to be randomly distributed according to a homogeneous two-dimensional Poisson point process with constant intensity. The conditions under which a helper can improve the transmission rate between a given pair of nodes are examined. Based on these conditions, an exact analytical expression is derived for the average cooperative throughput of a random CoopMAC network that is subject to path loss and shadowing. This expression is then used to investigate the effects of shadowing, intensity of nodes and the distance between source and destination nodes on the cooperative throughput of the network. It is observed that the average cooperative throughput of the network increases only slightly when the intensity of helpers increases beyond a certain value. 
Homa Nikbakht, Amir Masoud Rabiei, and Vahid Shah-Mansouri
cs.NI