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Design Guidelines for Training-based MIMO Systems with Feedback
In this paper, we study the optimal training and data transmission strategies
for block fading multiple-input multiple-output (MIMO) systems with feedback.
We consider both the channel gain feedback (CGF) system and the channel
covariance feedback (CCF) system. Using an accurate capacity lower bound as a
figure of merit, we investigate the optimization problems on the temporal power
allocation to training and data transmission as well as the training length.
For CGF systems without feedback delay, we prove that the optimal solutions
coincide with those for non-feedback systems. Moreover, we show that these
solutions stay nearly optimal even in the presence of feedback delay. This
finding is important for practical MIMO training design. For CCF systems, the
optimal training length can be less than the number of transmit antennas, which
is verified through numerical analysis. Taking this fact into account, we
propose a simple yet near optimal transmission strategy for CCF systems, and
derive the optimal temporal power allocation over pilot and data transmission.Comment: Submitted to IEEE Trans. Signal Processin
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