PHY-MAC performance of a MIMO network-assisted multiple access scheme

PHY-MAC analysis of the feedback-free network-assisted diversity multiple access (FF-NDMA) scheme is tackled in this work, for both SISO and MIMO configurations with orthogonal space-time block codes. FF-NDMA was envisaged as a collision resolution technique for uncoordinated wireless ad-hoc networks. In the SISO case collision resolution is achieved by transmitting time diversity in different slots (repeating packets) while in the MIMO case both time and spatial diversity are exploited. In this paper it is shown that retransmission diversity may improve the collision channel, in terms of energy savings, range extension or bandwidth efficiency.