Kast JM, Rezac JD, Römisch S, Elsherbeni AZ, Quimby JT. Timing Offset and Timing Stability for a Dual-Clock Channel Sounder.
IEEE Antennas Propag Mag 2021;
70:10.1109/TIM.2021.3082257. [PMID:
36575739 PMCID:
PMC9792071 DOI:
10.1109/tim.2021.3082257]
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Abstract
We describe a mathematical framework for evaluating timing offset and timing noise in channel sounders based on a second-order deterministic model and a stochastic metric based on the Allan Deviation. Using this framework, we analyze the timing offset and noise for a 1-6 GHz correlation-based channel sounder that uses rubidium clocks to provide a common timebase between the transmitter and receiver. We study timing behavior in three clock-distribution configurations. In the "untethered" configuration, the transmitter and receiver each have a rubidium clock, and no physical timing cable is connected between the clocks. In the "tethered" configuration, a coaxial cable synchronizes timing between the two separate clocks. Finally, a benchmark "single-clock" configuration is used where a single rubidium clock drives the transmitter and receiver.
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