NDLI: Multi-Degree Adaptive Cyclic Delay Diversity with Multi-User Scheduling

Content Provider	IEEE Xplore Digital Library
Author	Jingxiu Liu Xiaoming She Lan Chen Taoka, H. Higuchi, K.
Copyright Year	2008
Description	Author affiliation: DoCoMo Beijing-Labs., Beijing (Jingxiu Liu; Xiaoming She; Lan Chen)
Abstract	Multi-carrier based radio access schemes have been widely accepted as one of the PHY candidates in many standards, for their capabilities not only to combat multi-path propagation, but also to support multiple user access aided by multi-user scheduling. The performance of multi-user wireless system with multi-user scheduling depends on the fluctuation of independent channel response across different users. However, the channel selectivity may be limited in some channel conditions, e.g., light-of-sight (LOS) or spatial correlation, which may limit the multiuser diversity gain. Multi-degree random cyclic delay diversity (MD-RCDD) (Zhengang Pan et al., 2006) scheme is introduced to obtain opportunistic beamforming gain with intensified frequency fluctuation of channel response. However, the available delay sets in MD-CDD are randomly generated, not fully utilizing the spatial resources. Therefore, multi-degree adaptive cyclic delay diversity (MD-ACDD) scheme is proposed in this paper to further optimize the system performance, in which the available delay sets are channel-dependent, and generated based on the feedback information of all users. Moreover, the detailed working procedure and overhead analysis are presented, and simulation results show that proposed scheme can achieve significant performance gain compared with conventional MD-RCDD.
Starting Page	1181
Ending Page	1185
File Size	155907
Page Count	5
File Format	PDF
ISBN	9781424416448
ISSN	15502252
DOI	10.1109/VETECS.2008.250
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-11
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Fluctuations Physical layer Optical propagation Diversity methods Array signal processing Frequency diversity System performance Feedback Performance analysis
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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