期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 70, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2021.3082257
关键词
Channel sounder; fifth-generation (5G) technology; millimeter-wave wireless communication; propagation channel; system timing; time Allan deviation; timing errors; timing noise; timing offset; wireless system
The paper presents a mathematical framework for evaluating timing offset and noise in channel sounders. By analyzing different clock-distribution configurations, the study explores timing behaviors in these setups.
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 (Rb) clocks to provide a common timebase between the transmitter (Tx) and receiver (Rx). We study timing behavior in three clock-distribution configurations. In the untethered configuration, the Tx and Rx each have an Rb 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 Rb clock drives the Tx and Rx.
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