Abstract

In this paper, a random-access preamble (RAP) for the user equipment (UE) experiencing high Doppler in millimeter-wave (mmWave) cellular systems is proposed. After demonstrating the inefficiency of the conventional long-term evolution (LTE)-based RAP for fast-moving UEs (FUEs) in mmWave systems, linear-frequency-modulation-based RAP (LFM RAP) is proposed for the detection of FUEs. The correlation of LTE-based RAP, and ambiguity and extended-ambiguity functions of LFM RAP are analyzed to examine their properties affected by the high Doppler. The performance of RAPs is evaluated through detection and false alarm probabilities in a high Doppler and multiuser environment. The results show that the LFM RAP is appropriate for FUEs in mmWave cellular systems because of its high detection probability in a high-Doppler environment.

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