Semi-Online Precoding with Information Parsing for Cooperative MIMO Wireless Networks

Juncheng Wang, Ben Liang, Min Dong, Gary Boudreau, Hatem Abou-Zeid

Research output: Chapter in book/report/conference proceedingConference proceedingpeer-review

1 Citation (Scopus)

Abstract

We consider cooperative multiple-input multiple-output (MIMO) precoding design with multiple access points (APs) assisted by a central controller (CC) in a fading environment. Even though each AP may have its own local channel state information (CSI), due to the communication delay in the backhaul, neither the APs nor the CC has timely global CSI. Under this semi-online setting, our goal is to minimize the accumulated precoding deviation between the actual local precoders executed by the APs and an ideal cooperative precoder based on the global CSI, subject to per-AP transmit power limits. We propose an efficient algorithm, termed Semi-Online Precoding with Information Parsing (SOPIP), which accounts for the network heterogeneity in information timeliness and computational capacity. SOPIP does not require the CC to send the full global CSI to each AP. Instead, it takes advantage of the precoder structure to substantially lower the communication overhead, while allowing each AP to effectively combine its own timely local CSI with the delayed global CSI to enable adaptive precoder updates. We analyze the performance of SOPIP in the presence of both multi-slot communication delay and gradient estimation error, showing that it has a bounded performance gap from an offline optimal solution. Simulation results under typical Long-Term Evolution network settings further demonstrate the substantial performance gain of SOPIP over other centralized and distributed schemes.
Original languageEnglish
Title of host publicationINFOCOM 2022 - IEEE Conference on Computer Communications
PublisherIEEE
Pages150-159
Number of pages10
ISBN (Electronic)9781665458221
ISBN (Print)9781665458238
DOIs
Publication statusPublished - May 2022
Event41st IEEE Conference on Computer Communications, IEEE INFOCOM 2022 - Online
Duration: 2 May 20225 May 2022
https://infocom2022.ieee-infocom.org/index.html
https://ieeexplore.ieee.org/xpl/conhome/9796607/proceeding

Publication series

NameProceedings of IEEE International Conference on Computer Communications
PublisherIEEE
Volume2022-May
ISSN (Print)0743-166X
ISSN (Electronic)2641-9874

Conference

Conference41st IEEE Conference on Computer Communications, IEEE INFOCOM 2022
CityOnline
Period2/05/225/05/22
Internet address

User-Defined Keywords

  • MIMO
  • Cooperative precoding
  • Semi-online optimization
  • Information parsing
  • Multi-step gradient
  • Imperfect CSI
  • Delayed CSI

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