An Efficient Channel Estimation and CSI Feedback Method for Device-to-Device Communication in 3GPP LTE System

Kyunghoon LEE  Wipil KANG  Hyung-Jin CHOI  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.11   pp.2524-2533
Publication Date: 2014/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.2524
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
channel estimation,  CSI feedback,  D2D,  LTE,  

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In 3GPP (3-rd Generation Partnership Project) LTE (Long Term Evolution) systems, D2D (Device-to-Device) communication has been selected as a next generation study item. In uplink D2D communication that underlies LTE systems, uplink interference signals generated by CUE (Cellular User Equipment) have a profound impact on the throughput of DUE (D2D User Equipment). For that reason, various resource allocation algorithms which consider interference channels have been studied; however, these algorithms assume accurate channel estimation and feedback of D2D related links. Therefore, in order to estimate uplink channels of D2D communication, SRS (Sounding Reference Signal) defined in LTE uplink channel structure can be considered. However, when the number of interferes increases, the SRS based method incurs significant overheads such as side information, operational complexity, channel estimation and feedback to UE. Therefore, in this paper, we propose an efficient channel estimation and CSI (Channel State Information) feedback method for D2D communication, and its application in LTE systems. We verify that the proposed method can achieve a similar performance to SRS based method with lower operational complexity and overhead.