information at transmitters (CSIT). All transmitters are fixed while receiver i has high mobility
if i∈{1, 2,⋯, K 1} and has low mobility otherwise, where K-1≤ K 1≤ K, and the channel
coherence times for high-and low-mobility receivers are given by one and T, respectively. In
addition, we assume that both transmitter i and receiver i use M≥ T antennas if i∈{1, 2,⋯ K
1} and use only one antenna otherwise. In this paper, we propose an interference alignment …