Patent ID: 8548405
Filing Date: 2013-10-01
Classification: H04B

Abstract:
1. A method of controlling the phase of radio frequency (RF) output signals from a number of radios, comprising: providing a given radio at least one oscillator or synthesizer as a source of the RF output signal from the radio, and configuring the synthesizer to produce an output the phase of which is controlled by a phase offset command to a desired value relative to the phase of a reference signal; providing a path from an antenna port of the radio to obtain a fed back RF output signal; measuring a phase difference between the reference signal and the fed back RF output signal, and determining a value of a zero degree phase offset command for the synthesizer whereby the phase difference between the input reference signal and the fed back RF signal is nominally zero; storing the value of the determined zero degree phase offset command; and determining, according to the value of the stored zero degree phase offset command, the value of a phase offset command for providing a desired phase offset for the RF output signal from the radio.