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Cooperative Transmission Strategy Over Users’ Mobility for Downlink Distributed Antenna Systems

Khadka, Ashim and Adachi, Koichi and Sun, Sumei and Wang, Junyuan and Zhu, Huiling and Wang, Jiangzhou (2018) Cooperative Transmission Strategy Over Users’ Mobility for Downlink Distributed Antenna Systems. In: GLOBECOM 2017 - 2017 IEEE Global Communications Conference. IEEE. ISBN 978-1-5090-5020-8. E-ISBN 978-1-5090-5019-2. (doi:10.1109/GLOCOM.2017.8254565) (KAR id:63334)

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Previously, a scheme in [1] is proposed for the outdated channel state information (CSI) problem, for data transmission in time division duplex (TDD) systems. In user movement environment, the actual channel of data transmission at downlink time slot is different from the estimated channel due to channel variation. In this paper the effect of different user mobility on TDD downlink multiuser distributed antenna system is investigated. An efficient autocorrelation based feedback interval technique is proposed and updates CSI at less cost of the downlink time slots. In the proposed technique, the frequency of CSI feedback for different users is proportional to their speed. Cooperative clusters are formed to maximize sum rate where channel gain based antenna selection and user clustering based on SINR threshold is applied to reduce computational complexity. Numerical results show that sum rate superiority of the proposed scheme over the user mobility.

Item Type: Book section
DOI/Identification number: 10.1109/GLOCOM.2017.8254565
Uncontrolled keywords: interference; channel estimation; correlation; downlink; antennas; signal to noise ratio; precoding
Subjects: T Technology
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Jiangzhou Wang
Date Deposited: 08 Sep 2017 14:48 UTC
Last Modified: 16 Feb 2021 13:48 UTC
Resource URI: (The current URI for this page, for reference purposes)
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