naa a22 4500 510798683 CHVBK 20180411083346.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11277-013-1149-1 doi (NATIONALLICENCE)springer-10.1007/s11277-013-1149-1 Cyclic Prefix Update for OFDM Amplify-and-Forward Relay Systems [Elektronische Daten] [Bin Zhou, Honglin Hu, Haifeng Wang] We consider half-duplex amplify-and-forward (AF) relaying for increasing network coverage and spectrum efficiency of an OFDM-based cellular system. Due to the fact that OFDM symbols are transmitted over two serial multipath channels (i.e., the source-relay link and the relay-destination link) via AF relaying, the time spread of the received signal at destination nodes is introduced by both source-relay and relay-destination channels. Consequently, cyclic prefix (CP) added at the source node should have a much longer length than that of one-hop OFDM transmission to avoid inter-symbol interference. However, the increased CP length leads to the reduced spectrum efficiency of OFDM communications. In this paper, we propose a novel CP update scheme for achieving efficient and reliable multi-hop transmission in OFDM-based AF relay systems. By enabling the additional CP discarding and CP re-adding functionalities to relay nodes, the proposed scheme significantly reduces the required CP length without causing extra loss in the bit error rate performance, and therefore improves achievable end-to-end throughput and spectrum utilization efficiency. Simulation results confirm the theoretical analysis and illustrate the effectiveness of the proposed scheme. Springer Science+Business Media New York, 2013 Cyclic prefix (CP) nationallicence Amplify-and-Forward (AF) nationallicence Relay system nationallicence Orthogonal frequency-division multiplexing (OFDM) nationallicence Zhou Bin Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050, Shanghai, China aut Hu Honglin Shanghai Research Center for Wireless Communications, 200335, Shanghai, China aut Wang Haifeng Renesas Mobile Corporation, 200135, Shanghai, China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/4(2013-10-01), 2281-2294 0929-6212 72:4<2281 2013 72 11277 https://doi.org/10.1007/s11277-013-1149-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1149-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhou Bin Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050, Shanghai, China aut NATIONALLICENCE 700 1- Hu Honglin Shanghai Research Center for Wireless Communications, 200335, Shanghai, China aut NATIONALLICENCE 700 1- Wang Haifeng Renesas Mobile Corporation, 200135, Shanghai, China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/4(2013-10-01), 2281-2294 0929-6212 72:4<2281 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer