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Adaptive Modulation and Beam-forming for OFDM MIMO Systems with Rate-limited Feedback

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Author(s): Deb Debasish

Journal: IETE Journal of Research
ISSN 0377-2063

Volume: 56;
Issue: 3;
Start page: 175;
Date: 2010;
Original page

Keywords: Beam-forming | OFDM | MIMO

ABSTRACT
In this paper, an adaptive modulation and beam-forming strategy for orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) systems with rate-limited feedback is presented. It utilizes the correlation between OFDM subcarriers to reduce the amount of feedback of channel states from a receiver to a transmitter. An expression for the correlation coefficient between the squared gains of channel taps of the OFDM subcarrier for a Rayleigh fading channel with uniform and exponential multipath profile is derived. The performance of the proposed feedback strategy is compared with the one proposed.
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