tailieunhanh - Báo cáo hóa học: "Research Article Broadcast Reserved Opportunity Assisted Diversity Relaying Scheme and Its Performance Evaluation"

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 Broadcast Reserved Opportunity Assisted Diversity Relaying Scheme and Its Performance Evaluationb | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 521834 9 pages doi 2008 521834 Research Article Broadcast Reserved Opportunity Assisted Diversity Relaying Scheme and Its Performance Evaluation Xia Chen 1 Honglin Hu 1 Shengyao Jin 1 and Hsiao-Hwa Chen2 1 Shanghai Research Center for Wireless Communications SHRCWC Shanghai 200050 China 2 Department of Engineering Science National Cheng Kung University 1 University Road Tainan City 701 Taiwan Correspondence should be addressed to Hsiao-Hwa Chen hshwchen@ Received 29 December 2007 Accepted 2 March 2008 Recommended by Jong Hyuk Park Relay-based transmission can over the benefits in terms of coverage extension as well as throughput improvement if compared to conventional direct transmission. In a relay enhanced cellular REC network where multiple mobile terminals act as relaying nodes RNs multiuser diversity gain can be exploited. We propose an efficient relaying scheme referred to as Broadcast Reserved Opportunity Assisted Diversity BROAD for the REC networks. Unlike the conventional Induced Multiuser Diversity Relaying IMDR scheme our scheme acquires channel quality information CQI in which the destined node DN sends pilots on a reserved radio resource. The BROAD scheme can significantly decrease the signaling overhead among the mobile RNs while achieving the same multiuser diversity as the conventional IMDR scheme. In addition an alternative version of the BROAD scheme named as A-BROAD scheme is proposed also in which the candidate RN s feed back partial or full CQI to the base station BS for further scheduling purpose. The A-BROAD scheme achieves a higher throughput than the BROAD scheme at the cost of extra signalling overhead. The theoretical analysis given in this paper demonstrates the feasibility of the schemes in terms of their multiuser diversity gains in a REC network. Copyright 2008 Xia Chen et al. This is an open access article