TAILIEUCHUNG - Báo cáo hóa học: " Research Article Inter- and Intrasite Correlations of Large-Scale Parameters from Macrocellular Measurements at 1800 MHz"

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 Inter- and Intrasite Correlations of Large-Scale Parameters from Macrocellular Measurements at 1800 MHz | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 25757 12 pages doi 2007 25757 Research Article Inter- and Intrasite Correlations of Large-Scale Parameters from Macrocellular Measurements at 1800 MHz Niklas Jalden Per Zetterberg Bjorn Ottersten and Laura Garcia ACCES Linnaeus Center KTH Signal Processing Lab Royal Institute of Technology 100 44 Stockholm Sweden Received 15 November 2006 Accepted 31 July 2007 Recommended by A. Alexiou The inter- and intrasite correlation properties of shadow fading and power-weighted angle spread at both the mobile station and the base station are studied utilizing narrowband multisite MIMO measurements in the 1800 MHz band. The influence of the distance between two base stations on the correlation is studied in an urban environment. Measurements have been conducted for two different situations widely separated as well as closely located base stations. Novel results regarding the correlation of the power-weighted angle spread between base station sites with different separations are presented. Furthermore the measurements and analysis presented herein confirm the autocorrelation and cross-correlation properties of the shadow fading and the angle spread that have been observed in previous studies. Copyright 2007 Niklas Jalden 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 As the demand for higher data rates increases faster than the available spectrum more efficient spectrum utilization methods are required. Multiple antennas at both the receiver and the transmitter so-called multiple input multiple output MIMO systems is one technique to achieve high spectral efficiency 1 2 . Since multiantenna communication systems exploit the spatial characteristics of the propagation .

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