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 A MIMO-OFDM Testbed, Channel Measurements, and System Considerations for Outdoor-Indoor WiMAX | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID871291 13 pages doi 2010 871291 Research Article A MIMO-OFDM Testbed Channel Measurements and System Considerations for Outdoor-Indoor WiMAX Victor P. Gil Jimenez 1 M. Julia Fernandez-Getino Garcia 1 Ana García Armada 1 Rafael P. Torres 2 Juan Jose García Fernandez 1 Matilde P. Sanchez-Fernandez 1 Marta Domingo 2 and Oscar Fernandez2 1 Signal Theory and Communications Department Universidad Carlos III de Madrid Avenida de la Universidad 30 28911 Madrid Spain 2 Communications Engineering Department Universidad de Cantabria Avenida de los Castros s n. 39005 Santander Spain Correspondence should be addressed to Victor P. Gil Jimenez vgil@ Received 10 June 2009 Accepted 14 October 2009 Academic Editor Faouzi Bader Copyright 2010 Victor P. Gil Jimenez 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. The design implementation and test of a real-time flexible 2 X 2 Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing MIMO-OFDM IEEE prototype are presented. For the design a channel measurement campaign on the GHz band has been carried out focusing on outdoor-indoor scenarios. The analysis of measured channels showed that higher capacity can be achieved in case of obstructed scenarios and that Channel Distribution Information at the Transmitter CDIT capacity is close to Channel State Information at the Transmitter CSIT with much lower complexity and requirements in terms of channel estimation and feedback. The baseband prototype used an Field Programmable Gate Array FPGA where enhanced signal processing algorithms are implemented in order to improve system performance. We have shown that for MIMO-OFDM systems extra signal processing such as enhanced
