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Báo cáo hóa học: " Research Article Characteristics of MIMO-OFDM Channels in Indoor Environments"

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 Characteristics of MIMO-OFDM Channels in Indoor Environments | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 19728 9 pages doi 10.1155 2007 19728 Research Article Characteristics of MIMO-OFDM Channels in Indoor Environments Hajime Suzuki Thi Van Anh Tran and Iain B. Collings Wireless Technologies Laboratory CSIRO ICT Centre P.O. Box 76 Epping NSW 1710 Australia Received 1 April 2006 Revised 16 October 2006 Accepted 19 October 2006 Recommended by Merouane Debbah We present the results of multiple-input multiple-output orthogonal frequency-division multiplexing MIMO-OFDM channel measurements. The measurements were performed in indoor environments using four transmitters and four receivers with 40 MHz bandwidth at 5.25 GHz. Our measurements reveal two-dimensional small-scale fading and correlation between MIMO subchannels. In the line-of-sight LoS case the MIMO-OFDM channel capacity is found to be strongly dependent on the local scattering environment and much less dependent in the non-LoS NLoS case. Also MIMO channel capacity is found to be largely uncorrelated over 20 MHz in NLoS while a strong correlation is found over 40 MHz in some LoS environments. The validity of the conventional Kronecker correlation channel model is tested along with a recently proposed joint correlation model. The effects of varying antenna element spacing are also investigated taking into account such effects as mutual coupling radiation efficiency and radiation pattern. Copyright 2007 Hajime Suzuki 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 Multiple-input multiple-output orthogonal frequencydivision multiplexing MIMO-OFDM is currently being considered as a strong candidate for the physical layer transmission scheme of next generation wireless communication systems 1 . A commercial product utilizing