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Adaptive Distributed Transceiver Synchronization Over a 90 Meter Microwave Wireless Link

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Document pages: 11 pages

Abstract: We present an adaptive approach for synchronizing both the phase andfrequency of radio-frequency transceivers over long-range wireless links tosupport distributed antenna array applications. To enable distributedbeamforming between separate wireless nodes, the oscillators in thetransceivers must operate at the same frequency, and their phases must beappropriately aligned to support phase-coherent beamsteering. Based on aspectrally-sparse waveform, a self-mixing circuit, and an adaptive controlloop, we present a system capable of synchronizing the RF oscillators inseparate transceivers over distances of nearly 100 m. The approach is based ona spectrally-sparse waveform for joint inter-node ranging and frequencytransfer. A frequency reference is modulated onto one signal of a two-tonewaveform transmitted by the primary node which is demodulated and used to lockthe oscillator of the secondary node. The secondary node retransmits thetwo-tone signal which the primary node uses for a high-accuracy rangemeasurement. From this range, the phase of the two transceivers can be alignedto support beamforming. We furthermore implemented an adaptive phase controlapproach to support high-accuracy phase coordination in changing environmentalconditions. We demonstrate continuous high accuracy links over a 90 m distancein an outdoor environment for durations up to seven days, demonstratingsufficient phase coordination in changing weather conditions to supportdistributed beamforming at frequencies up to 3 GHz.

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