Abstract: A method and system is provided for communicating four distinct data signals over a single frequency. Data signals carrying first and second data are polarized in two distinct circular polarities and are transmitted. Signals consisting of third data signal and a 180 degree out of phase equal amplitude inverse of third data signal are transmitted together in two orthogonal linear polarities. Signals consisting of fourth data signal and of 180 degree out of phase equal amplitude inverse of said fourth data signal are transmitted together in two orthogonal linear polarities and at a 45 degree rotation from said third data signals. The circular signals are received without interfering linear signals since the inverse linear signals cancel in the circularly polarized antenna at reception. A method for canceling the interfering circular signals from the linear signals is disclosed. The amount of distinct data transmitted over the single frequency is doubled.

Abstract: The invention describes a technique for reusing radio frequencies, i.e., transmitting two signals on the same frequency at the same time. A signal is transmitted on one frequency in one pole. A second signal in the same frequency band is transmitted on one polarity and its inverse is transmitted on the opposite polarity. By using an antenna that receives equally both polarities of the second signal and the first signal, the two inverse signals cancel out, and the second signal can be received and detected. This signal is suitable for use in mobile applications. By using an antenna with the feed polarity aligned with the polarity of the second signal, and only receiving one polarity, the second signal can be received and detected. This is suited for fixed antenna sites, thus accomplishing frequency reuse.