Patent ID: 7180970

Claim:
A method for synchronized high frequency communication of data between a first station having a first modem and a second station having a second modem, comprising the steps of: synchronizing the communication using an external reference signal derived from a double sideband residual carrier signal not transmitted for the purpose of providing synchronization; wherein the synchronizing step is performed by using a filter and phase locked loop to recover the carrier signal and mixing the recovered carrier signal with a frequency offset; establishing a selected communications channel between the first modem and the second modem; and wherein the step of establishing a communications channel between the first modem and the second modem is performed by scanning a plurality of channels including the selected communications channel, and selecting the selected communications channel using the results of a Link Quality Analysis (LQA) to compare the plurality of channels; communicating the information over the selected communications channel using coherent modulation without using a modem training interval.