\chapter{Conclusion}

This work develops a survey propagation based distributed algorithm that conducts the CF massive MIMO pilot assignment optimization. The developed algorithm can efficiently describe the association of groups of multiple users to a pilot sequence to be shared and determine the corresponding best matching implemented via a message-passing approach. Numerical experiments demonstrate that the proposed framework outperforms other existing schemes with respect to the overall network throughput. %Future research work includes exemplar selection 까지 최적화 및 AP selection에도 적용 for user centric implementation
