tailieunhanh - Báo cáo hóa học: " Research Article Bandwidth-Efficient Cooperative Relaying Schemes with Multiantenna Relay"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Bandwidth-Efficient Cooperative Relaying Schemes with Multiantenna Relay | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 683105 11 pages doi 2008 683105 Research Article Bandwidth-Efficient Cooperative Relaying Schemes with Multiantenna Relay Khuong Ho-Van and Tho Le-Ngoc Department of Electrical and Computer Engineering McGill University Montreal QC Canada H3A 2A7 Correspondence should be addressed to Tho Le-Ngoc tho@ Received 1 November 2007 Revised 12 February 2008 Accepted 17 March 2008 Recommended by Hyundong Shin We propose coded cooperative relaying schemes in which all successfully decoded signals from multiple sources are forwarded simultaneously by a multiantenna relay to a common multiantenna destination to increase bandwidth efficiency. These schemes facilitate various retransmission strategies at relay and single-user and multiuser iterative decoding techniques at destination suitable for trade-offs between performance latency and complexity. Simulation results show that the proposed schemes significantly outperform direct transmission under the same transmit power and bandwidth efficiency. Copyright 2008 K. Ho-Van and T. Le-Ngoc. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Cooperative relaying has attracted a great deal of attention recently due to its capability of improving performance increasing system capacity extending coverage and so forth 1 2 . Different signal processing techniques for retransmission and detection at relays and destination for cooperative relaying have been presented. In 3-6 the relays receive signals from sources in one phase and simply amplify or demodulate source signals before forwarding processed signals to the destination in another phase. The destination can use maximum ratio combining in both phases to recover the original information.