User Assignment with Distributed Large Intelligent Surface (LIS) Systems

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

In this paper, we consider a wireless communication system where a large intelligent surface (LIS) is deployed comprising a number of small and distributed LIS-Units. Each LIS-Unit has a separate signal process unit (SPU) and is connected to a central process unit (CPU) that coordinates the behaviors of all the LIS-Units. With such a LIS system, we consider the user assignments both for sum-rate and minimal user-rate maximizations. That is, assuming $M$ LIS-Units deployed in the LIS system, the objective is to select $K$ ($K\!\leq\!M$) best LIS-Units to serve $K$ autonomous users simultaneously. Based on the nice property of effective inter-user interference suppression of the LIS-Units, the optimal user assignments can be effectively found through classical linear assignment problems (LAPs) defined on a bipartite graph. To be specific, the optimal user assignment for sum-rate and user-rate maximizations can be solved by linear sum assignment problem (LSAP) and linear bottleneck assignment problem (LBAP), respectively. The elements of the cost matrix are constructed based on the received signal strength (RSS) measured at each of the $M$ LIS-Units for all the $K$ users. Numerical results show that, the proposed user assignments are close to optimal user assignments both under line-of-sight (LoS) and scattering environments.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Communication Systems
Original languageEnglish
Title of host publication2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)
PublisherIEEE--Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)978-1-5386-6009-6
ISBN (Print)978-1-5386-6010-2
Publication statusPublished - 2018 Dec 20
Publication categoryResearch
Peer-reviewedYes
EventIEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2018 - Bologna, Italy
Duration: 2018 Sep 92018 Sep 12

Conference

ConferenceIEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2018
CountryItaly
CityBologna
Period2018/09/092018/09/12