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 WiMAX-Based Implementation of Network MIMO for Indoor Wireless Systems | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 963547 11 pages doi 2009 963547 Research Article A WiMAX-Based Implementation of Network MIMO for Indoor Wireless Systems Sivarama Venkatesan 1 Howard Huang 1 Angel Lozano 2 and Reinaldo Valenzuela1 1 Wireless Communications Research Bell Labs Alcatel-Lucent 791 Holmdel Road Holmdel NJ 07733 USA 2Deptartment of Information Communication Technologies Universitat Pompeu Fabra C Roc Boronat 138 08018 Barcelona Spain Correspondence should be addressed to Sivarama Venkatesan sivarama@ Received 26 November 2008 Revised 6 April 2009 Accepted 20 July 2009 Recommended by Robert W. Heath It is well known that multiple-input multiple-output MIMO techniques can bring numerous benefits such as higher spectral efficiency to point-to-point wireless links. More recently there has been interest in extending MIMO concepts to multiuser wireless systems. Our focus in this paper is on network MIMO a family of techniques whereby each end user in a wireless access network is served through several access points within its range of influence. By tightly coordinating the transmission and reception of signals at multiple access points network MIMO can transcend the limits on spectral efficiency imposed by cochannel interference. Taking prior information-theoretic analyses of network MIMO to the next level we quantify the spectral efficiency gains obtainable under realistic propagation and operational conditions in a typical indoor deployment. Our study relies on detailed simulations and for specificity is conducted largely within the physical-layer framework of the IEEE Mobile WiMAX system. Furthermore to facilitate the coordination between access points we assume that a high-capacity local area network such as Gigabit Ethernet connects all the access points. Our results confirm that network MIMO stands to provide a multiple-fold increase in spectral .
