A New Efficient Distributed Orthogonal Space Time Block Coding in Cooperative Relay Networks

A new design of distributed space time block coding for cooperative relay networks is presented in this paper. The Hadmard matrix and decode-and-forward approach are used at each relay node to generate the new efficient code. Each relay transmits its new code as a linear function of its received signal from the source node. This proposed method uses linear decoding process at the destination node to achieve full data transmission rate and doubling cooperative diversity order without any feedback link between the relay nodes and the destination node. The proposed scheme yields low encoding and decoding complexities at the relay and destination nodes. Furthermore, the simulation results show great performance enhancement without any feedback overhead as compared to regular reported methods.