1. A method for calculating a phase adjustment, comprising: establishing a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device; receiving a control signal comprising a plurality of windows, a window communicating one or more power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of windows comprising: one or more previous windows, a previous window communicating one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and a current window communicating one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment; estimating a previous power trend from the one or more previous power indicators; estimating a current power trend from the one or more current power indicators; determining a power trend change from the previous power trend and the current power trend, the power trend change representing a change between the previous power trend and the current power trend; determining a phase increment in accordance with the power trend change; and calculating a next phase adjustment from the current phase adjustment and the phase increment.