Timing synchronization plays a critical role in many high performance software defined radio applications. However, currently, to achieve the level of synchronization required to perform distributed open loop beamforming, cabled techniques such as precision PPS fanout buffers or White Rabbit must be used to align the system clocks to within a small fraction of a sample. However, we have recently presented techniques to achieve picosecond-level synchronization wirelessly for distributed phased array beamforming accomplished using the RF front-end on Ettus X300 software defined radios. This talk will address the waveform design, time delay estimation and refinement process, and software implementation strategies used to achieve this high level of performance using host-controlled processing in GNU Radio.
|Talk Length||30 Minutes|