MAP Based V-BLAST Transmission to Improve Network Lifetime in Virtual MIMO Based Wireless Sensor Networks

Abstract

One of the major issues in wireless sensor network is to reduce the energy consumption and to improve the network lifetime. Present work describes about the maximum a posterior estimate based V-BLAST transmission is used to improve the network life time of energy constrained networks. Here the sensors are randomly distributed and for data transmission V-BLAST method is used. Before transmitting data, the source node has to choose cooperative nodes and at each hop the selection of cooperative nodes is necessary. For proper selection of cooperative nodes, both prior and posterior probabilities are considered. The posterior probability is calculated with the knowledge of prior probability. The prior parameters are residual energy (${\text{R}}_{\text{e }}$) and distance (${\text{D}}_{\text{t }}$) of the intermediate nodes. The post conditions are channel interference (${\text{C}}_{\text{i }}$), delay for transmitting (${\text{T}}_{\text{d }}$) data to intermediator node, overload (${\text{O}}_{\text{l }}$) at an intermediator node.