Abstract
Pilot reuse in the multi-cell massive multi-input multi-output system is investigated where user groups with different priorities exist. Recent investigation on pilot reuse has revealed that when the ratio of the coherent time interval to the number of users is reasonably high, it is beneficial not to fully reuse pilots from interfering cells. This paper finds the optimum pilot assignment strategy that would maximize the weighted sum rate (WSR) given the user groups with different priorities. A closed-form solution for the optimal pilot assignment is derived and is shown to make intuitive sense. Performance comparison shows that under wide range of channel conditions, the optimal pilot assignment that uses extra set of pilots achieves better WSR performance than conventional full pilot reuse.
| Original language | English |
|---|---|
| Article number | 7937781 |
| Pages (from-to) | 1728-1740 |
| Number of pages | 13 |
| Journal | IEEE Journal on Selected Areas in Communications |
| Volume | 35 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2017 Aug |
Bibliographical note
Funding Information:Manuscript received November 28, 2016; revised April 4, 2017; accepted April 4, 2017. Date of publication June 1, 2017; date of current version July 15, 2017. This work is in part supported by the National Research Foundation of Korea under Grant No. 2016R1A2B4011298, and in part supported by the ICT R&D program of MSIP/IITP 2016-0-00563, Research on Adaptive Machine Learning Technology Development for Intelligent Autonomous Digital Companion. (Corresponding author: Jy-yong Sohn.) The authors are with the School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea (e-mail: jysohn1108@kaist.ac.kr; shyoon8@kaist.ac.kr; jmoon@kaist.edu).
Publisher Copyright:
© 2017 IEEE.
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Electrical and Electronic Engineering