Diversity and Multiplexing Tradeoff in SIMO/MISO Channels: Two-Way Training and Power Control

In this paper, we study the impact of imperfect channel state information at the transmitter and receiver (CSITR) on the diversity-multiplexing tradeoff in single-input multi-output (SIMO)/multi- input single-output (MISO) fading channels with two- way training. We consider two two-way training strategies: 1) the destination initiates the training, and 2) the source initiates the training. We show that for time division duplex (TDD) systems, imperfect CSITR significantly improves the optimal diversity gain through two-way training and power control.