tailieunhanh - Báo cáo hóa học: "Research Article Relay Architectures for 3GPP LTE-Advanced"

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 Relay Architectures for 3GPP LTE-Advanced | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 618787 14 pages doi 2009 618787 Research Article Relay Architectures for 3GPP LTE-Advanced Steven W. Peters Ali Y. Panah Kien T. Truong and Robert W. Heath Jr. Department of Electrical and Computer Engineering The University of Texas at Austin 1 University Station C0803 Austin TX 78712-0240 USA Correspondence should be addressed to Steven W. Peters speters@ Received 17 February 2009 Accepted 31 May 2009 Recommended by Angel Lozano The Third Generation Partnership Project s Long Term Evolution-Advanced is considering relaying for cost-effective throughput enhancement and coverage extension. While analog repeaters have been used to enhance coverage in commercial cellular networks the use of more sophisticated fixed relays is relatively new. The main challenge faced by relay deployments in cellular systems is overcoming the extra interference added by the presence of relays. Most prior work on relaying does not consider interference however. This paper analyzes the performance of several emerging half-duplex relay strategies in interference-limited cellular systems one-way two-way and shared relays. The performance of each strategy as a function of location sectoring and frequency reuse are compared with localized base station coordination. One-way relaying is shown to provide modest gains over singlehop cellular networks in some regimes. Shared relaying is shown to approach the gains of local base station coordination at reduced complexity while two-way relaying further reduces complexity but only works well when the relay is close to the handset. Frequency reuse of one where each sector uses the same spectrum is shown to have the highest network throughput. Simulations with realistic channel models provide performance comparisons that reveal the importance of interference mitigation in multihop cellular networks. Copyright 2009 .