  Inspired by the anisotropy of Doppler effect with wave propagations, we
propose a new method to leverage one information symbol serving two users
located in two geometrically orthogonal directions. Specifically in broadband
wireless communication, we use multiple antennas with the proposed signal
switching method to emulate a moving emission source and yield the frequency
shift, referred to as Quasi Doppler effect, which is converted to the discrete
phase modulation. Further, using this discrete modulated phase can adjust the
phase of one transmit symbol in achieving two different phases in different
directions. The modulation mechanism is explained through theoretical
derivations with the analysis on the performance robustness in the
application-scenarios of crossroads having small geometric deviations. In
contrast to the use of conventional symbols, this approach can double the
transmission efficiency which is confirmed by our simulations results.
