Tham khảo luận văn - đề án 'báo cáo hóa học: " research article capacity of wireless ad hoc networks with opportunistic collaborative communications"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 53075 7 pages doi 2007 53075 Research Article Capacity of Wireless Ad Hoc Networks with Opportunistic Collaborative Communications O. Simeone and U. Spagnolini Dipartimento di Elettronica e Informazione Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano Italy Received 17 January 2006 Revised 13 November 2006 Accepted 27 December 2006 Recommended by Christian Hartmann Optimal multihop routing in ad hoc networks requires the exchange of control messages at the MAC and network layer in order to set up the centralized optimization problem. Distributed opportunistic space-time collaboration OST is a valid alternative that avoids this drawback by enabling opportunistic cooperation with the source at the physical layer. In this paper the performance of OST is investigated. It is shown analytically that opportunistic collaboration outperforms centralized optimal multihop in case spatial reuse . the simultaneous transmission of more than one data stream is not allowed by the transmission protocol. Conversely in case spatial reuse is possible the relative performance between the two protocols has to be studied case by case in terms of the corresponding capacity regions given the topology and the physical parameters of network at hand. Simulation results confirm that opportunistic collaborative communication is a promising paradigm for wireless ad hoc networks that deserves further investigation. Copyright 2007 O. Simeone and U. Spagnolini. 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 The emergence of novel wireless services such as meshbased wireless LANs and sensor networks is causing a shift of the interest of the communications community from .
