tailieunhanh - Báo cáo hóa học: " Research Article Multi-Satellite MIMO Communications at Ku-Band and Above: Investigations on Spatial "

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 Multi-Satellite MIMO Communications at Ku-Band and Above: Investigations on Spatial | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 59608 11 pages doi 2007 59608 Research Article Multi-Satellite MIMO Communications at Ku-Band and Above Investigations on Spatial Multiplexing for Capacity Improvement and Selection Diversity for Interference Mitigation Konstantinos P Liolis Athanasios D. Panagopoulos and Panayotis G. Cottis Wireless Satellite Communications Group School of Electrical and Computer Engineering National Technical University of Athens NTUA 9Iroon Polytechniou Street Zografou Athens 15780 Greece Received 28 August 2006 Revised 2 March 2007 Accepted 13 May 2007 Recommended by Alessandro Vanelli-Coralli This paper investigates the applicability of multiple-input multiple-output MIMO technology to satellite communications at the Ku-band and above. After introducing the possible diversity sources to form a MIMO matrix channel in a satellite environment particular emphasis is put on satellite diversity. Two specific different topics from the field of MIMO technology applications to satellite communications at these frequencies are further analyzed i capacity improvement achieved by MIMO spatial multiplexing systems and ii interference mitigation achieved by MIMO diversity systems employing receive antenna selection. In the first case a single-user capacity analysis of a satellite 2 X 2 MIMO spatial multiplexing system is presented and a useful analytical closed form expression is derived for the outage capacity achieved. In the second case a satellite 2 X 2 MIMO diversity system with receive antenna selection is considered adjacent satellite cochannel interference on its forward link is studied and an analytical model predicting the interference mitigation achieved is presented. In both cases an appropriate physical MIMO channel model is assumed which takes into account the propagation phenomena related to the frequencies of interest such as clear line-of-sight operation .