Extendable carrier synchronization for distributed beamforming in wireless sensor networks
Shuo Shi, Shida Zhu, Xuemai Gu, Ruidong Hu · 2016
Transmit beamforming is a traditional technique for multi-antenna network. Recently, idea of beamforming is applied in wireless sensor network, which can extent its communication distance significantly. An extendable scheme is proposed for carrier synchronization of distributed beamforming in this paper. All slave nodes adjust local oscillation with the selected master node's oscillation to synchronize carrier frequency. Phase is synchronized at receiving terminal by means that master node rollover signal from each slave node and send it back to counteract phase differences. Simulation is given to analyze its performance. Results show that signal is strengthened at receiving terminal. Besides, circuit prototype is recommended. Effects of node mobility are discussed.