Topological Pilot Assignment in Large-Scale Distributed MIMO Networks

Yu, Han, Yi, Xinping ORCID: 0000-0001-5163-2364 and Caire, Giuseppe (2022) Topological Pilot Assignment in Large-Scale Distributed MIMO Networks. IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 21 (8). pp. 6141-6155.

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Official URL: http://dx.doi.org/10.1109/twc.2022.3146624

Abstract

We consider the pilot assignment problem in large-scale distributed multi-input multi-output (MIMO) networks, where a large number of remote radio head (RRH) antennas are randomly distributed in a wide area, and jointly serve a relatively smaller number of users (UE) coherently. By artificially imposing structures on the UE-RRH connectivity, we model the network by a partially-connected interference network, so that the pilot assignment problem can be cast as a topological interference management problem with multiple groupcast messages. Building upon such connection, we formulate the topological pilot assignment (TPA) problem in two different ways with respect to whether or not the to-be-estimated channel connectivity pattern is known a priori. When it is known, we formulate the TPA problem as a low-rank matrix completion problem that can be solved by a simple alternating projection algorithm. Otherwise, we formulate it as a sequential maximum weight induced matching problem that can be solved by either a mixed integer linear program or a simple yet efficient greedy algorithm. With respect to two different formulations of the TPA problem, we evaluate the efficiency of the proposed algorithms under the cell-free massive MIMO setting.

Item Type:	Article
Uncontrolled Keywords:	Massive MIMO, Antenna arrays, Channel estimation, Wireless communication, Contamination, Computer architecture, Interference, Distributed massive MIMO, pilot assignment, topological interference management, network connectivity
Divisions:	Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User:	Symplectic Admin
Date Deposited:	24 Jan 2022 16:58
Last Modified:	17 Mar 2024 13:23
DOI:	10.1109/TWC.2022.3146624
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3147559