Abstract: A mesh network is initiated by using multiple frequency bands for establishing communication between mesh nodes. In one aspect, a higher or lower frequency communication link may be established depending on the range between two mesh nodes. As the mesh network increases and decreases in density, and range and communication aspects change, a communication link may be change between the higher and lower frequency bands as necessary.

Abstract: A method is provided for coherently tracking a radio signal including a plurality of digitally modulated reference subcarriers. The method comprises the steps of receiving symbols transmitted on the reference subcarriers, combining the reference subcarrier symbols with a known reference sequence conjugate to produce a plurality of samples, median filtering the samples to produce filtered samples, and smoothing the samples for each of the reference subcarriers over the plurality of reference subcarriers to produce a coherent reference signal estimate for each of the subcarriers. A receiver for coherently tracking a radio signal including at least one digitally modulated reference carrier is also provided.