Sub-Optimum Detection Scheme with Double the Full Diversity for Asynchronous Cooperative Relay Network

Abstract

Distributed space time block coding in wireless cooperative relay networks have attracted significant interest due to its bandwidth efficiency and high reliability. To achieve full diversity and full data transmission rate, most researchers assumed perfect timing synchronization within the network. However, synchronisation in wireless cooperative relay networks is difficult in real environment due to the distributed nature of cooperative relay nodes. This paper first, deals with designing an efficient distributed space time block coding system to obtain double the full diversity and full data transmission rate for asynchronous cooperative relay networks. The second part deal with developing a low-level computational complexity sub-optimum detection scheme to overcome the imperfect synchronisation issues arising among the relay nodes. The computational complexity level depends only upon the constellation size. Analytical analysis and simulation results show that the double the full diversity with full data transmission rate are achieved. The proposed sub-optimum detection scheme can also effectively eliminate the intersymbol interference induced by the lack of synchronisation between the relay nodes at the destination node.