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 Optimal Design of Nonuniform Linear Arrays in Cellular Systems by Out-of-Cell Interference Minimization | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 93421 9 pages doi 2007 93421 Research Article Optimal Design of Nonuniform Linear Arrays in Cellular Systems by Out-of-Cell Interference Minimization S. Savazzi 1 O. Simeone 2 and U. Spagnolini1 1 Dipartimento di Elettronica e Informazione Politecnico di Milano 20133 Milano Italy 2 Center for Wireless Communications and Signal Processing Research CCSPR New Jersey Institute of Technology University Heights Newark NJ 07102-1982 USA Received 13 October 2006 Accepted 11 July 2007 Recommended by Monica Navarro Optimal design of a linear antenna array with nonuniform interelement spacings is investigated for the uplink of a cellular system. The optimization criterion considered is based on the minimization of the average interference power at the output of a conventional beamformer matched filter and it is compared to the maximization of the ergodic capacity throughput . Out-of-cell interference is modelled as spatially correlated Gaussian noise. The more analytically tractable problem of minimizing the interference power is considered first and a closed-form expression for this criterion is derived as a function of the antenna spacings. This analysis allows to get insight into the structure of the optimal array for different propagation conditions and cellular layouts. The optimal array deployments obtained according to this criterion are then shown via numerical optimization to maximize the ergodic capacity for the scenarios considered here. More importantly it is verified that substantial performance gain with respect to conventionally designed linear antenna arrays . uniform X 2 interelement spacing can be harnessed by a nonuniform optimized linear array. Copyright 2007 S. Savazzi et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any .
