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 Scalable Ad Hoc Networks for Arbitrary-Cast: Practical Broadcast-Relay Transmission Strategy Leveraging Physical-Layer Network Coding | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 621703 15 pages doi 2008 621703 Research Article Scalable Ad Hoc Networks for Arbitrary-Cast Practical Broadcast-Relay Transmission Strategy Leveraging Physical-Layer Network Coding Chen Chen 1 Kai Cai 2 and Haige Xiang1 1 School of Electroncis Engineering and Computer Science Peking University Beijing 100871 China 2 Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Correspondence should be addressed to Chen Chen Received 1 August 2007 Revised 15 November 2007 Accepted 25 February 2008 Recommended by Huaiyu Dai The capacity of wireless ad hoc networks is constrained by the interference of concurrent transmissions among nodes. Instead of only trying to avoid the interference physical-layer network coding PNC is a new approach that embraces the interference initiatively. We employ a network form of interference cancellation with the PNC approach and propose the multihop broadcastrelay transmission strategy in linear rectangular and hexagonal networks. The theoretical analysis shows that it gains the transmission efficiency by the factors of for the rectangular networks and 2 for the hexagonal networks. We also propose a practical signal recovery algorithm in the physical layer to deal with the influence of multipath fading channels and time synchronization errors as well as to use media access control MAC protocols that support the simultaneous receptions. This transmission strategy obtains the same efficiency from one-to-one communication to one-to-many. By our approach the number of the users terminals of the network has better scalability and the overall network throughput is improved. Copyright 2008 Chen Chen et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided .
