Truncated ARQ based MRC over OSTBC cooperative communication for energy constrained wireless networks
Irfan Ahmed, Syed Ismail Shah, Jamil Ahmad, Mugen Peng · 2009
Composite design for energy minimization across PHY/MAC layers of the protocol stack as well as the underlying hardware in multi-hop wireless network is presented. We use truncated ARQ for two-fold purpose i) initialization of cooperative communications without CSI overhead and ii) to provide time diversity for MRC reception when the channel coherent time is comparable to packet transmission time. Alamouti and Tarokh space--time block codes are used to realize 3/4 rates codes, MQAM modulation, transmit, and receive nodes, and MAC layer truncated ARQ for error rate and energy consumption performance of cooperative communication. The convexity of average energy consumption per packet function is proved under certain conditions that can be solved by Lagrange multiplier method.