Comparative Research of One-Bit Feedback Algorithms Based on UAV Swarm

One-bit feedback algorithm is a commonly used phase synchronization algorithm in distributed beamforming, which can synchronize the phase of the signal emitted from distributed transmitting unit at the receiving end, thereby maximizing the received signal strength and achieving the purpose of long-distance transmission. Four one-bit feedback algorithms are introduced: one-bit feedback algorithm, one-bit feedback algorithm with variable directional perturbation, one-bit feedback algorithm using two time slots and one-bit feedback algorithm exploiting cumulative positive feedback information. The system model of distributed beamforming is constructed based on UAV swarm. Under the ideal condition and additive white Gaussian noise, the convergence rate of different algorithms is obtained, the performance of these algorithms is summarized, and the principle and the effect of different improvement methods are analyzed. The results indicate that one-bit feedback algorithm exploiting cumulative positive feedback information has the best performance under both experimental conditions, however, under the influence of strong noise, the three improved algorithms lose their robustness.