tailieunhanh - Báo cáo hóa học: " Research Article Capacity Performance of Adaptive Receive Antenna Subarray Formation for MIMO Systems"

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 Capacity Performance of Adaptive Receive Antenna Subarray Formation for MIMO Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 56471 12 pages doi 2007 56471 Research Article Capacity Performance of Adaptive Receive Antenna Subarray Formation for MIMO Systems Panagiotis Theofilakos and Athanasios G. Kanatas Wireless Communications Laboratory Department of Technology Education and Digital Systems University of Piraeus 80Karaoli Dimitriou Street 18534 Piraeus Greece Received 15 November 2006 Accepted 1 August 2007 Recommended by R. W. Heath Jr. Antenna subarray formation is a novel RF preprocessing technique that reduces the hardware complexity of MIMO systems while alleviating the performance degradations of conventional antenna selection schemes. With this method each RF chain is not allocated to a single antenna element but instead to the complex-weighted and combined response of a subarray of elements. In this paper we derive tight upper bounds on the ergodic capacity of the proposed technique for Rayleigh . channels. Furthermore we study the capacity performance of an analytical algorithm based on a Frobenius norm criterion when applied to both Rayleigh . and measured MIMO channels. Copyright 2007 P. Theofilakos and A. G. Kanatas. 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. 1. INTRODUCTION The interest in multiple-input multiple-output MIMO antenna systems has exploded over the last years because of their potential of achieving remarkably high spectral efficiency. However their practical application has been limited by the increased manufacture cost and energy consumption of the RF chains performing the frequency transition between microwave and baseband and analog-to-digital converters the number of which is proportional to the number of antenna elements. This high degree of hardware complexity