Doppler spectrum measurements of vehicular radio channels using a narrowband sounder

Abstract

This paper describes the implementation of a narrowband sounder for Doppler power spectrum (DPS) measurements of vehicular communication channels. The narrowband channel sounder is implemented using general purpose equipment, making such measurement platform easy to replicate for didactic and research purposes. To demonstrate the practical value of this framework, a measurement campaign was conducted to obtain empirical information about the spectral characteristics of vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) multipath radio channels in the 700 MHz band. The collected data wasprocessed to compute the average Doppler shift and the Doppler spread of the measured channels. The obtained results show that the spectral properties of frequency-dispersive vehicular radio channels can be effectively analyzed using narrowband sounding principles.

Doppler Spectrum Measurement Platform for Narrowband V2V Channels

“…This paper is the culmination of our previous work presented in [51]. The scope and contributions of [51] are extended here as follows:…”

“…This discussion is intended to help the reader to understand how our implementation works, and to identify its capabilities and limitations. We bring attention to a practical issue that affects the computation of the Doppler spectrum and that passed unnoticed in [51]: the presence of artifacts due to cross-terms in the measured channel's spectrogram. Moreover, we discuss the configuration of the hardware parameters that set the tradeoff between acquisition time and Doppler frequency resolution.…”