tailieunhanh - Báo cáo hóa học: " Research Article Time-Division Multiuser MIMO with Statistical Feedback"

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 Time-Division Multiuser MIMO with Statistical Feedback | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 632134 15 pages doi 2008 632134 Research Article Time-Division Multiuser MIMO with Statistical Feedback Kai-Kit Wong and Jia Chen Department of Electrical and Electronic Engineering University College London Adastral Park Research Campus Martlesham Heath IP5 3RE Suffolk UK Correspondence should be addressed to Kai-Kit Wong Received 29 May 2007 Revised 4 September 2007 Accepted 28 October 2007 Recommended by David Gesbert This paper investigates a time-division multiuser multiple-input multiple-output MIMO antenna system in K-block flat fading where users are given individual outage rate probability constraints and only one user accesses the channel at any given time slot or block . Assuming a downlink channel and that the transmitter knows only the statistical information about the channel our aim is to minimize the overall transmit power for achieving the users outage constraint by jointly optimizing the power allocation and the time-sharing . the number of time slots of the users. This paper first derives the so-called minimum power equation MPE to solve for the minimum transmit power required for attaining a given outage rate probability of a single-user MIMO block-fading channel if the number of blocks is predetermined. We then construct a convex optimization problem which can mimic the original problem structure and permits to jointly consider the power consumption and the probability constraints of the users to give a suboptimal multiuser time-sharing solution. This is finally combined with the MPE to provide a joint power allocation and time-sharing solution for the time-division multiuser MIMO system. Numerical results demonstrate that the proposed scheme performs nearly the same as the global optimum with inappreciable difference. Copyright 2008 . Wong and J. Chen. This is an open access article distributed under .