Time-multiplexed / superimposed pilot selection for massive MIMO pilot decontamination
Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkaperä
Abstract
In massive multiple-input multiple-output (MIMO) systems, superimposed (SP) and time-multiplexed (TM) pilots exhibit a complementary behavior, with the former and latter schemes offering a higher throughput in high and low inter-cell interference scenarios, respectively. Based on this observation, in this paper, we propose an algorithm for partitioning users into two disjoint sets comprising users that transmit TM and SP pilots. This selection of user sets is accomplished by minimizing the total inter-cell and intra-cell interference, and since this problem is found to be non-convex, a greedy approach is proposed to perform the partitioning. Based on simulations, it is shown that the proposed method is versatile and offers an improved performance in both high and low-interference scenarios.
BibTeX
@inproceedings{icassp2017_timemultiplexeds,
title = {Time-multiplexed / superimposed pilot selection for massive MIMO pilot decontamination},
author = {Karthik Upadhya and Sergiy A. Vorobyov and Mikko Vehkaperä},
booktitle = {ICASSP 2017},
year = {2017}
}