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The most salient feature differentiating millimeter-wave communication systems from their predecessors will be electronically steerable pencil-beam antennas at the transceivers. Due to their extremely narrow beamwidth and the sparse millimeter-wave channel, few multipath components will be captured by the pencil-beams. Although each component has a unique Doppler-frequency shift, the combination of shifts across the detected multipath components captured will give rise to a Doppler spread. The width of the spread is uncertain because, to our knowledge, there are no such measurement results for millimeter-wave systems in open literature to date. To fill this void, we have designed an 83.5-GHz channel sounder that can measure the shift of multipath components in a mobile environment with super-resolution. In this letter, we develop a parameterized model for the Doppler spread by synthesizing the measured frequency shifts through a simulated antenna with variable beamwidth.
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Wang et al. (2017) studied this question.
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