Self-adapting Cyclic Delay Diversity System

Authors:
Aoyang Zheng;Yafeng Wang;Dacheng Yang;Wei Xiang
Affiliations:
Wireless Theories & Technologies (WT&T) Lab, Beijing University of Posts and Telecommunications, Beijing, P.R. China;Wireless Theories & Technologies (WT&T) Lab, Beijing University of Posts and Telecommunications, Beijing, P.R. China;Wireless Theories & Technologies (WT&T) Lab, Beijing University of Posts and Telecommunications, Beijing, P.R. China;Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, Australia 4350
Venue:
RSKT '09 Proceedings of the 4th International Conference on Rough Sets and Knowledge Technology
Year:
2009

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Abstract

Cyclic Delay Diversity (CDD) is a simple and efficient space-time diversity technique. It can be used in OFDM and DFT-Spread-OFDM. The traditional CDD has low complexity and system overhead, however, also has some limitations on performance and is sensitive to propagation environment. In this paper, two improved CDD scheme including open-loop and close-loop strategies for uplink and downlink of EUTRA LTE are introduced. Compared with the conventional method, the new schemes can obtain higher performance and less sensitivity to environment.