tailieunhanh - Báo cáo hóa học: " Research Article Adaptive Coordinated Reception for Multicell MIMO Uplink"

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 Adaptive Coordinated Reception for Multicell MIMO Uplink | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 195309 11 pages doi 2011 195309 Research Article Adaptive Coordinated Reception for Multicell MIMO Uplink Xiaojia Lu Wei Li Antti Tolli and Markku Juntti Centre for Wireless Communications University of Oulu . Box 4500 90014 Oulu Finland Correspondence should be addressed to Xiaojia Lu Received 30 June 2010 Revised 9 October 2010 Accepted 16 January 2011 Academic Editor Francesco Verde Copyright 2011 Xiaojia Lu 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. We study the coordinated reception amongst multiple base stations BS in the uplink cellular system where each mobile station MS is served by an associated multiple BS set MBS . Under the individual signal-to-interference-plus-noise ratio SINR constraint per MS power control and receive beamforming are jointly optimized with adaptive MBS selection to minimize the total transmit power. An iterative optimization algorithm is presented accordingly. The joint optimization problem is nonconvex in general but it can be optimally solved by the proposed algorithm as long as it is feasible. To find the optimum the proposed algorithm requires the exhaustive search over all BSs per MS. To reduce the complexity in the large-scale cellular network we propose simplified schemes where a subset of BSs is preselected based on the large-scale fading factors. By limiting the search in the subset the complexity is reduced significantly. Although the obtained power vector with the simplified algorithm is not optimal a performance close to the macronetwork full coordination can be achieved by carefully choosing the sizes of the pre-selected BS subset and MBS. The significant advantage is proven by simulations. 1. Introduction Uplink