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In this paper, the authors propose a phase synchronization scheme for distributed beam-forming in wireless sensor networks. The scheme is decentralized, meaning that the Base Station (BS) is not required to coordinate the allocation of sensors to the corresponding training timeslots. The BS is only asked to perform an estimation and quantization of the signal phase in each timeslot, and send it as a feedback to the sensor nodes. In order to find the optimal number of training timeslots, they derive an upper-bound of the resulting beam-forming gain in this specific scenario. Computer simulation results are given in terms of achievable throughput for different number of sensors.
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