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 Low-Complexity Transmission and Scheduling Scheme for WiMAX Systems with Base Station Cooperation | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 527591 10 pages doi 2010 527591 Research Article A Low-Complexity Transmission and Scheduling Scheme for WiMAX Systems with Base Station Cooperation Turgut Baris Tokel and Defne Aktas Department of Electrical and Electronics Engineering Bilkent University 06800 Ankara Turkey Correspondence should be addressed to Defne Aktas daktas@ Received 2 November 2009 Revised 12 March 2010 Accepted 17 August 2010 Academic Editor Yan Xin Copyright 2010 T. B. Tokel and D. Aktas. 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. This paper considers base station cooperation as an interference management technique for the downlink of a WiMAX network IEEE standard with frequency reuse factor of 1. A low-complexity cooperative transmission and scheduling scheme is proposed that requires limited feedback from the users and limited information exchange between the base stations. The proposed scheme requires minor modifications to the legacy IEEE systems. The performance of the proposed scheme is compared with noncooperative schemes with similar complexity through computer simulations. Results demonstrate that base station cooperation provides an attractive solution for mitigating the cochannel interference and increases the system spectral efficiency compared to traditional cellular architectures based on frequency reuse. 1. Introduction Multiple-input and multiple-output MIMO and orthogonal frequency division multiple access OFDMA techniques have become essential components of contemporary wireless communication systems such as WiMAX IEEE standard 1 . Channel state information CSI at the transmitter is important in OFDMA systems in order to exploit the frequency and .
