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 Measurements of MIMO Indoor Channels at 1800 MHz with Multiple Indoor and Outdoor Base Stations | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 28073 10 pages doi 2007 28073 Research Article Measurements of MIMO Indoor Channels at 1800 MHz with Multiple Indoor and Outdoor Base Stations Laura García 1 Niklas Jalden 2 Bjorn Lindmark 2 Per Zetterberg 2 and Leandro de Haro1 1 Departamento de Senales Sistemas yRadiocommunicaciones Universidad Politecnica de Madrid UPM 28040 Madrid Spain 2 Signal Processing Lab School of Electrical Engineering Royal Institute of Technology KTH 100 44 Stockholm Sweden Received 1 April 2006 Revised 5 November 2006 Accepted 17 December 2006 Recommended by Rodney A. Kennedy This paper proposes several configurations for multiple base stations in indoor MIMO systems and compares their performance. The results are based on channel measurements realized with a MIMO testbed. The receiver was moved along several routes and floors on an office building. Both outdoor and indoor locations are considered for the transmitters or base stations which allow the analysis of not only indoor but also outdoor-to-indoor environment. The use of 2 base stations with different system level combinations of the two is analyzed. We show that the 2 X 4 configuration with base station selection provides almost as good performance as a 4 X 4 full water-filling scheme when the 2 base stations are placed at different locations. Also the spatial correlation properties for the different configurations are analyzed and the importance of considering path loss when evaluating capacity is highlighted. Copyright 2007 Laura García 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 substantial increase in capacity made possible with the use of multiple antennas has led to a considerable interest in multiple-input .
