Uplink Cooperative Interference Cancellation for Cellular-Connected UAV: A Quantize-and-Forward Approach

TL;DR

This paper introduces a cooperative interference cancellation scheme for cellular-connected UAVs that uses local BS cooperation and quantize-and-forward techniques to mitigate uplink interference, enhancing spectral efficiency.

Contribution

It proposes a novel CIC scheme utilizing local cooperation and quantize-and-forward, outperforming existing decode-and-forward based methods in UAV uplink interference mitigation.

Findings

Achievable rates depend on UAV transmit power and rate.

The proposed scheme outperforms decode-and-forward CIC under certain conditions.

Linear/nonlinear interference cancellation techniques are effective in this context.

Abstract

Aerial-ground interference is the main obstacle to achieving high spectral efficiency in cellular networks with both traditional terrestrial users and new unmanned aerial vehicle (UAV) users. Due to their strong line-of-sight (LoS) channels with the ground, UAVs could cause/suffer severe interference to/from a large number of non-associated but co-channel base stations (BSs) in their uplink/downlink communications. In this letter, we propose a new cooperative interference cancellation (CIC) scheme for the UAV's uplink communication to mitigate its strong interference to co-channel BSs, which requires only local cooperation between each co-channel BS and its adjacent helping BSs. Specifically, the helping BSs without serving any users in the UAV's communication channel quantize and forward their received signals from the UAV to their aided co-channel BS, which then processes the quantized signals jointly with its own received signal to decode its served terrestrial user's message via canceling the UAV's signal by linear/nonlinear interference cancellation techniques (ICTs). We derive the achievable rates of the proposed CIC scheme with different ICTs as a function of the UAV's transmit power and rate, and thereby unveil the conditions under which the proposed CIC scheme outperforms the existing CIC scheme based on the decode-and-forward (DF) operation of the helping BSs.