Pseudo Whitening of Intercarrier Interference in the Asynchronous URLLC Downlink
Journal
IEEE International Conference on Communications
Journal Volume
2019-May
Date Issued
2019
Author(s)
Zeng, C.-H.
Abstract
Applying the concept of virtual cell together with open-loop communications and proactive network association has recently been shown to achieve ultra-reliable and low-latency communication (uRLLC) in vehicular networks. Nevertheless, losing perfect synchronization creates difficulty in tackling multiple access interference (MAI). Multiple carrier frequency offsets (CFOs) due to different oscillators at different access points (APs) incur serious intercarrier interference (ICI) to complicate downlink MAI, from which a more challenging scenario emerges. Asynchronous multiuser detection (MUD) with ICI-Whitening leads to satisfactory performance, but the whitening scheme needs the covariance matrix of ICI that is practically hard to obtain for downlink receivers. We therefore propose Pseudo-ICI-Whitening, which does not rely on the estimation of ICI covariance, is suitable for asynchronous downlink. In terms of post-processing signal-to-interference-plus-noise ratio (SINR) and bit-error rate (BER), our proposed mechanism can approach ICI-Whitening as a practical receiver design.
Type
conference paper