Adaptive modulation and joint temporal spatial power allocation for oSTBC mIMO systems with pmperfect CSI

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Author(s)

Detail(s)

Original languageEnglish
Article number6199936
Pages (from-to)1914-1924
Journal / PublicationIEEE Transactions on Communications
Volume60
Issue number7
Publication statusPublished - Jul 2012

Abstract

We propose a novel adaptive transmission scheme for space-time coded multiple-input multiple-output beamforming systems with imperfect channel state information at the transmitter, of which the signal constellation, total transmit power (temporal power), and power allocation among eigen-beams (spatial power) are jointly adapted to maximize the average spectral efficiency, subject to a target bit-error-rate and an average power constraint. The power allocation over the spatial and temporal domains makes the traditional approach of partitioning the received signal-to-noise ratio (SNR) inapplicable to the above design problem. By introducing a new variable, called as effective signal-to-noise-to-modulation ratio (ESNMR), we derive a rate-selection policy by partitioning the range of the ESNMR with an optimal set of thresholds. A closed-form temporal power control policy and a simple spatial power allocation algorithm are also obtained. Numerical results demonstrate that the new adaptive transmission scheme yields a significant performance gain over existing adaptation systems. © 1972-2012 IEEE.

Research Area(s)

  • Adaptive modulation, beamforming, imperfect CSI, multiple-input multiple-output (MIMO), orthogonal space-time block coding (OSTBC), power allocation