Energy efficient relay placement for dual hop wireless transmission

This paper examines whether introduction of a third node, i.e., a wireless relay (R), placed between source node (S) and destination node (D), can improve the energy efficiency of the system. For collinear arrangement, a comparison of energy consumed per successful bit transmission reveals that energy saving is possible only when R is placed at a certain distance from S (or D) and there exists an optimum location where energy saving is maximum. For non-linear scenarios, however, the amount of energy saving depends on the two-dimensional co-ordinates of R. In this case, we have identified regions on the S–R–D plane that satisfies a given minimum energy saving constraint.