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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Vydáno v:	IEEE transactions on wireless communications Ročník 21; číslo 8; s. 6141 - 6155
Hlavní autoři:	Yu, Han, Yi, Xinping, Caire, Giuseppe
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York IEEE 01.08.2022 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	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
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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.
AbstractList	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.
Author	Yu, Han Yi, Xinping Caire, Giuseppe
Author_xml	– sequence: 1 givenname: Han orcidid: 0000-0002-8489-2266 surname: Yu fullname: Yu, Han email: han.yu@liverpool.ac.uk organization: Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K – sequence: 2 givenname: Xinping orcidid: 0000-0001-5163-2364 surname: Yi fullname: Yi, Xinping email: xinping.yi@liverpool.ac.uk organization: Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K – sequence: 3 givenname: Giuseppe orcidid: 0000-0002-7749-1333 surname: Caire fullname: Caire, Giuseppe email: caire@tu-berlin.de organization: Department of Electrical Engineering and Computer Science, Technical University of Berlin, Berlin, Germany
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SubjectTerms	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
Title	Topological Pilot Assignment in Large-Scale Distributed MIMO Networks
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