Topological Pilot Assignment in Large-Scale Distributed MIMO Networks

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 impo...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 21; no. 8; pp. 6141 - 6155
Main Authors: Yu, Han, Yi, Xinping, Caire, Giuseppe
Format: Journal Article
Language:English
Published: New York IEEE 01.08.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Antenna arrays
Assignment problem
Channel estimation
Computer architecture
Contamination
Distributed massive MIMO
Greedy algorithms
Integer programming
Interference
Massive MIMO
MIMO communication
Mixed integer
network connectivity
Operations research
pilot assignment
topological interference management
Topology
Wireless communication
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Summary: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.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2022.3146624