K-node connected power efficient topologies in wireless networks with sectored antennas

We consider the problem of survivable minimum power bidirectional topology optimization in wireless networks with sectored antennas. In this paper we take an algebraic view of graph connectivity, which is defined as the second smallest eigenvalue of the laplacian matrix of a graph. We propose a (sub-optimal) centralized heuristic procedure for constructin- power efficient K-node connected topologies. The procedure comprises a construction phase and an improvement phase. The construction phase is based on Kruskal's algorithm for the minimum spanning tree (MST) problem. However unlike Kruskal's MST algorithm which chooses minimum cost edges front a set of edge weights, our algorithm uses an incremental cost mechanism to select edges. The topology improvement phase is used to remove non-essential edges from the construction phase, without affecting the desired connectivity.