Sequence Design for Position Estimation of High-Velocity Vehicles in Millimeter-Wave Cellular Systems

摘要

Since the conventional longterm evolution (LTE) positioning reference signal (PRS) is designed for LTE systems below 6 GHz, it is more sensitive and inefficient for high-velocity vehicles (HVV) experiencing a high Doppler in millimeter-wave (mmWave) cellular systems. In this paper, a new Doppler insensitive sequence, called an oscillatory pulse sequence (OPS), is proposed for the positioning of HVVs in mmWave cellular systems. The ambiguity function (AF) and cross-ambiguity function of OPS are analyzed to examine its autocorrelation and cross-correlation properties in the existence of Doppler shift. Simulation results show that OPS provides an accurate timing (distance) estimation in the existence of a high Doppler shift, which is the ideal characteristic of the AF for positioning.