Self-adapting Cyclic Delay Diversity System

—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 closeloop 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. Keywords- Cyclic Delay Diversity (CDD), orthogonal frequency-division multiplexing (OFDM), DFT-Spread-OFDM (DFT-S-OFDM), self-adapting, transmit diversity

• Type: Conference
• Year: 2009
• Where: RSKT
• Authors: Aoyang Zheng, Yafeng Wang, Dacheng Yang, Wei Xiang
• Keywords: Delay Diversity, Efficient Space-time Diversity, Information Retrieval, RSKT 2009, —cyclic Delay Diversity