Patent ID: 7809337

Claim:
A system for adjusting relative transmission phasing between signals transmitted from a plurality of transmitting antenna elements to at least one receiving antenna element, comprising: a phase reference having non-overlapping components separated in frequency or time, each component being applied to one of the plurality of transmitting antenna elements along with identical data such that the signals transmitted from different transmitting antenna elements contain the identical data and non-overlapping components; a signal combining element associated with the at least one receiving antenna element and operable to receive the components and the identical data and extract phase information; a phase adjustment signaling device for comparing extracted phase information and signaling the plurality of transmitting antenna elements to adjust the relative transmission phasing between the signals transmitted from the plurality of transmitting antenna elements to permit the at least one receiver to receive the transmitted signals with a desired phase relationship; delay elements disposed in the transmitting antenna elements, the delay elements set to approximately equalize a difference in signal paths to the transmitting antenna elements in addition to a difference in signal paths from the transmitting antenna elements to the at least one receiving antenna element, the phase reference and delay elements are set to maximize constructive interference between transmitted data subcarriers and maximize system gain.