Cooperative Communication Based on IDMA

Cooperative communication schemes can provide diversity gain. However, when the network model is compose of multiple source-destination pairs with multiple common relays, interference problems arise. In this paper, we propose a cooperative transmission scheme based on Interleave-division multiple-access (IDMA) with decode-and-forward (DF) and amplify-and-forward (AF) protocols so that destinations can cancel the interference and achieve diversity gain. The simulations show diversity gains of at least 8 dB when cooperative communication has been implemented with IDMA over DF and AF protocols. We also provide an insight to how power allocation between sources and relays would affect the performance. It reveals that relay nodes can be adaptive to select DF or AF protocol based on the constraints of power allocation and the locations of relays.