A fuzzy clustering algorithm based on multipath component trajectory for millimeter wave radio channels

Time-varying channel modeling plays an important role for many applications in time-variant scenarios, while most clustering algorithms focus on static channels and cannot accurately model the channel time-evolution properties. In this paper, a fuzzy clustering algorithm based on multipath component (MPC) trajectory is proposed. Firstly, both the distance and velocity similarities of the MPCs in different snapshots are taken into account to track the MPC trajectory, in which the fuzzy scheme and a kernel function are used to calculate the distance and velocity similarities, respectively. Secondly, a fuzzy MPC trajectory clustering algorithm is proposed to cluster the MPCs in multiple snapshots. The MPCs in a snapshot are clustered according to the membership, which is defined as the probability that a MPC belongs to different clusters. Finally, time-varying channels at 28 GHz are simulated to validate the performance of our proposed algorithm. The results show that our proposed algorithm is able to accurately identify the clusters in time-varying channels compared with the existing clustering algorithms.