Unknown Interference Modeling for Rate Adaptation in Cell-Free Massive MIMO Networks
arxiv(2024)
摘要
Co-channel interference poses a challenge in any wireless communication
network where the time-frequency resources are reused over different
geographical areas. The interference is particularly diverse in cell-free
massive multiple-input multiple-output (MIMO) networks, where a large number of
user equipments (UEs) are multiplexed by a multitude of access points (APs) on
the same time-frequency resources. For realistic and scalable network
operation, only the interference from UEs belonging to the same serving cluster
of APs can be estimated in real-time and suppressed by precoding/combining. As
a result, the unknown interference arising from scheduling variations in
neighboring clusters makes the rate adaptation hard and can lead to outages.
This paper aims to model the unknown interference power in the uplink of a
cell-free massive MIMO network. The results show that the proposed method
effectively describes the distribution of the unknown interference power and
provides a tool for rate adaptation with guaranteed target outage.
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