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: A Portable MIMO Testbed and Selected Channel Measurements | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 51490 Pages 1-10 DOI ASP 2006 51490 A Portable MIMO Testbed and Selected Channel Measurements Paul Goud Jr. Robert Hang Dmitri Truhachev and Christian Schlegel Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada T6G 2V4 Received 30 November 2004 Revised 10 July 2005 Accepted 22 August 2005 A portable 4 X 4 multiple-input multiple-output MIMO testbed that is based on field programmable gate arrays FPGAs and which operates in the 902-928 MHz industrial scientific and medical ISM band has been developed by the High Capacity Digital Communications HCDC Laboratory at the University of Alberta. We present a description of the HCDC testbed along with MIMO channel capacities that were derived from measurements taken with the HCDC testbed for three special locations a narrow corridor an athletics field that is surrounded by a metal fence and a parkade. These locations are special because the channel capacities are different from what is expected for a typical indoor or outdoor channel. For two of the cases a ray-tracing analysis has been performed and the simulated channel capacity values closely match the values calculated from the measured data. A ray-tracing analysis however requires accurate geometrical measurements and sophisticated modeling for each specific location. A MIMO testbed is ideal for quickly obtaining accurate channel capacity information. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION Multiple-input multiple-output MIMO wireless technology with its promise to increase channel capacities is now being considered for use in commercial systems. For example there have been many proposals to include MIMO technology in the upcoming standard for wireless local area networks WLAN 1 . The IEEE task group was created to make specifications for WLAN systems . home .
