2018/07/31 by C. Umit Bas, Bas, C. Umit, Rui Wang +15 · 1 citation
Engineering · #FOS: Computer and information sciences #FOS: Electrical engineering #Information Theory (cs.IT) #Microwave Engineering and Waveguides #Millimeter-Wave Propagation and Modeling #Radio Frequency Integrated Circuit Design #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.1807.11921
openalex publication_date 2018/07/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we present a novel real-time multiple-input-multiple-output\n(MIMO) channel sounder for the 28 GHz band. Until now, most investigations of\nthe directional characteristics of millimeter-wave channels have used\nmechanically rotating horn antennas. In contrast, the sounder presented here is\ncapable of performing horizontal and vertical beam steering with the help of\nphased arrays. Due to its fast beam-switching capability, the proposed sounder\ncan perform measurements that are directionally resolved both at the\ntransmitter(TX) and receiver (RX) in 1.44 milliseconds compared to the minutes\nor even hours required for rotating horn antenna sounders. This not only\nenables measurement of more TX-RX locations for a better statistical validity\nbut also allows to perform directional analysis in dynamic environments. The\nshort measurement time combined with the high phase stability limits the phase\ndrift between TX and RX, enabling phase-coherent sounding of all beam pairs\neven when TX and RX have no cabled connection for synchronization without any\ndelay ambiguity. Furthermore, the phase stability over time enables complex RX\nwaveform averaging to improve the signal to noise ratio during high path loss\nmeasurements. The paper discusses both the system design as well as the\nmeasurements performed for verification of the sounder performance.\nFurthermore, we present sample results from double directional measurements in\ndynamic environments.\n