Paper <a href="http:&#x2F;&#x2F;networks.cs.northwestern.edu&#x2F;publications&#x2F;wifm&#x2F;icnp2015-flores.pdf" rel="nofollow">http:&#x2F;&#x2F;networks.cs.northwestern.edu&#x2F;publications&#x2F;wifm&#x2F;icnp20...</a><p>&gt; We show that the digital signal that accompanies broadcast FM radio has sufficient structure to enable effective scheduling relative to it. It thus provides a common reference for neighboring devices to harmonize their transmissions, yet without requiring any explicit communication among them.