Performance Analysis of the Sidelink Broadcast Channel for 5G NR Systems in the Unlicensed Band

Abstract

One of the new research challenges of recent times has been the extension of 5G New Radio-Unlicensed (NR-U) to Sidelink. The essence of the challenge was to develop a fair coexistence of Sidelink devices with other unlicensed band users. One such challenge was to modify the physical channels and signals of Sidelink to meet channelization requirements in the unlicensed band. The interlaced structure for allocating physical channel resources was a solution to this challenge. In this paper, we provide a detailed performance analysis of Physical Sidelink Broadcast Channel (PSBCH) for an unlicensed band with interlaced structure. The performance is investigated in the frequency-selective channel with different parameters. It is shown that the use of interlaced structure can provide a performance gain for some channel parameters. The present analysis in the time-varying channel has shown performance gains due to the Doppler diversity of the channel provided by the structure of the broadcast channel. The results of the correlation between the channel estimation accuracy and the observed performance improvement due to the Doppler diversity of the channel are demonstrated.