tailieunhanh - Báo cáo hóa học: " Research Article Spatial Multiplexing Gains for Realistic Sized Ad Hoc Networks with Directional Antenna Arrays"

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 Spatial Multiplexing Gains for Realistic Sized Ad Hoc Networks with Directional Antenna Arrays | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 98490 12 pages doi 2007 98490 Research Article Spatial Multiplexing Gains for Realistic Sized Ad Hoc Networks with Directional Antenna Arrays Eugene Perevalov 1 Danny Safi 1 2 Lang Lin 2 and Rick S. Blum2 1 Department of Industrial and Systems Engineering of Lehigh University Bethlehem PA 18015 USA 2 Department of Electrical and Computer Engineering of Lehigh University Bethlehem PA 18015 USA Received 7 January 2007 Revised 27 April 2007 Accepted 16 August 2007 Recommended by Wolfgang Gerstacker We concentrate on an ad hoc network model with nodes on integer lattice points over a 2D plane. We examine the limits of ad hoc network performance for systems with antenna arrays capable of allowing both spatial multiplexing and directional processing. Two cases are considered. In the first case we consider perfect directional antenna arrays in other words each node can form beams of infinitesimally narrow beamwidth. In this case the throughput capacity of an ad hoc network is independent of the network size. In the second case we consider a more practical system where each node can form a fixed number of beams of finite beamwidth. Our results show that the spatial multiplexing gains depend on the system size antenna beamwidth and number of antenna beams. Furthermore we show that spatial multiplexing gains offsetting the interference-related performance degradation can be achieved in ad hoc networks with thousands of nodes. Copyright 2007 Eugene Perevalov 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 the original work is properly cited. 1. INTRODUCTION The application of multiple antennas at both the transmitter and receiver sides of a wireless system for the purpose of spatial multiplexing simply put spatial multiplexing

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