A Quasi-Doppler Method for Doubling Transmission Efficiency Through Two Orthogonal Directions

TL;DR

This paper introduces a novel quasi-Doppler method that leverages the anisotropic Doppler effect to double transmission efficiency in broadband wireless communication by serving two orthogonal directions with a single symbol.

Contribution

The paper proposes a new quasi-Doppler technique that uses signal switching and phase modulation to simultaneously serve two users in orthogonal directions, effectively doubling transmission efficiency.

Findings

The method achieves doubled transmission efficiency in simulations.

The approach is robust to small geometric deviations at crossroads.

Theoretical analysis supports the effectiveness of the quasi-Doppler modulation.

Abstract

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.