Figure 2From: Link Gain Matrix Estimation in Distributed Large-Scale Wireless NetworksTop view of layout of 400-nodes ORBIT testbed. Both the vertical and horizontal dimensions are measured in meters (m). The three added rectangles in the middle represent obstructing pillars. The 21 transmitters highlighted with red stars and circled within ellipses serve transmit-receive links in all three categories. All other transmitters serve links in only the first and second categories.Back to article page